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iNat_map.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="description" content="Map of iNaturalist Observations" />
<title>Map of iNaturalist Observations</title>
<style>
body { height:100vh; width:100vw; margin:0px; font:10pt Sans-Serif;}
#mapid { height:100vh; width:100vw; position:absolute; top:0vh; left:0vw; background:darkgray; }
#info { padding:15px; }
h1 { margin-top:0px; }
a { text-decoration:none; }
</style>
<link rel="stylesheet" href="https://unpkg.com/[email protected]/dist/leaflet.css" integrity="sha256-p4NxAoJBhIIN+hmNHrzRCf9tD/miZyoHS5obTRR9BMY=" crossorigin=""/>
<script src="https://unpkg.com/[email protected]/dist/leaflet.js" integrity="sha256-20nQCchB9co0qIjJZRGuk2/Z9VM+kNiyxNV1lvTlZBo=" crossorigin=""></script>
<script>
// debug grid example from https://leafletjs.com/examples/extending/extending-2-layers.html
L.GridLayer.DebugCoords = L.GridLayer.extend({
createTile: function (coords) {
var tile = document.createElement('div');
tile.innerHTML = [coords.x, coords.y, coords.z].join(', ');
tile.style.outline = '1px solid red';
return tile;
}
});
L.gridLayer.debugCoords = function(opts) {
return new L.GridLayer.DebugCoords(opts);
};
// this allows a style filter to be applied to a basemap tile layer
L.TileLayer.StyleFilter = L.TileLayer.extend({
intialize: function (url, options) {
L.TileLayer.prototype.initialize.call(this, url, options);
},
styleFilter: function () {
var filters = this.options.filter || '';
return filters;
},
_initContainer: function () {
var tile = L.TileLayer.prototype._initContainer.call(this);
this._container.style.filter = this.styleFilter();
},
});
L.tileLayer.styleFilter = function (url, options) {
return new L.TileLayer.StyleFilter(url, options);
};
// this provides a way to get some USGS map images as tiles, as an alternative to WMS
// primary use case is when the WMS Server doesn't respond very quickly
// but this can also be used for other reasons, such as custom styling of the tiles
L.TileLayer.USGS = L.TileLayer.extend({
intialize: function (url, options) {
L.TileLayer.prototype.initialize.call(this, url, options);
},
getTileUrl: function (coords) {
var data = {
//r: Browser.retina ? '@2x' : '',
//s: this._getSubdomain(coords),
x: coords.x,
y: coords.y,
z: this._getZoomForUrl()
};
let mMax = 20037508.3428;
let mTile = 2*mMax/(Math.pow(2,data.z));
let bb = [
data.x*mTile-mMax,
-(data.y+1)*mTile+mMax,
(data.x+1)*mTile-mMax,
-data.y*mTile+mMax,
];
data['p'] = `&f=image&bboxSR=102100&imageSR=102100&size=${this._tileSize.x},${this._tileSize.y}&bbox=${bb[0]},${bb[1]},${bb[2]},${bb[3]}`;
if (this.options.renderingRule) { data['p'] += `&renderingRule=%7B"rasterFunction"%3A"${this.options.renderingRule}"%7D`; };
return this._url + data.p;
//return Util.template(this._url, Util.extend(data, this.options));
},
styleFilter: function () {
var filters = this.options.filter || '';
return filters;
},
_initContainer: function () {
var tile = L.TileLayer.prototype._initContainer.call(this);
this._container.style.filter = this.styleFilter();
},
});
L.tileLayer.usgs = function (url, options) {
return new L.TileLayer.USGS(url, options);
};
/*
https://github.com/mapbox/corslite
BSD 2-Clause License
Copyright (c) 2017, Mapbox
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
function corslite(url, callback, cors) {
var sent = false;
if (typeof window.XMLHttpRequest === 'undefined') {
return callback(Error('Browser not supported'));
}
if (typeof cors === 'undefined') {
var m = url.match(/^\s*https?:\/\/[^\/]*/);
cors = m && (m[0] !== location.protocol + '//' + location.hostname +
(location.port ? ':' + location.port : ''));
}
var x = new window.XMLHttpRequest();
function isSuccessful(status) {
return status >= 200 && status < 300 || status === 304;
}
if (cors && !('withCredentials' in x)) {
// IE8-9
x = new window.XDomainRequest();
// Ensure callback is never called synchronously, i.e., before
// x.send() returns (this has been observed in the wild).
// See https://github.com/mapbox/mapbox.js/issues/472
var original = callback;
callback = function() {
if (sent) {
original.apply(this, arguments);
} else {
var that = this, args = arguments;
setTimeout(function() {
original.apply(that, args);
}, 0);
}
}
}
function loaded() {
if (
// XDomainRequest
x.status === undefined ||
// modern browsers
isSuccessful(x.status)) callback.call(x, null, x);
else callback.call(x, x, null);
}
// Both `onreadystatechange` and `onload` can fire. `onreadystatechange`
// has [been supported for longer](http://stackoverflow.com/a/9181508/229001).
if ('onload' in x) {
x.onload = loaded;
} else {
x.onreadystatechange = function readystate() {
if (x.readyState === 4) {
loaded();
}
};
}
// Call the callback with the XMLHttpRequest object as an error and prevent
// it from ever being called again by reassigning it to `noop`
x.onerror = function error(evt) {
// XDomainRequest provides no evt parameter
callback.call(this, evt || true, null);
callback = function() { };
};
// IE9 must have onprogress be set to a unique function.
x.onprogress = function() { };
x.ontimeout = function(evt) {
callback.call(this, evt, null);
callback = function() { };
};
x.onabort = function(evt) {
callback.call(this, evt, null);
callback = function() { };
};
// GET is the only supported HTTP Verb by XDomainRequest and is the
// only one supported here.
x.open('GET', url, true);
// Send the request. Sending data is not supported.
x.send(null);
sent = true;
return x;
}
if (typeof module !== 'undefined') module.exports = corslite;
/*
https://github.com/consbio/Leaflet.UTFGrid/blob/master/L.UTFGrid.js
Copyright (c) 2015 - 2017, Conservation Biology Institute
Permission to use, copy, modify, and/or distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
//heavily modified from: https://raw.githubusercontent.com/danzel/Leaflet.utfgrid/leaflet-master/src/leaflet.utfgrid.js
//depends on corslite
L.UTFGrid = L.TileLayer.extend({
options: {
resolution: 4,
pointerCursor: true,
mouseInterval: 66 // Delay for mousemove events
},
_mouseOn: null,
_mouseOnTile: null,
_tileCharCode: null, // '<tileKey>:<charCode>' or null
_cache: null, // {<tileKey>: <utfgrid>}
_idIndex: null, // {<featureID>: {<tileKey1>: true, ...<tileKeyN>: true} }
_throttleMove: null, // holds throttled mousemove handler
//_throttleConnectEventHandlers: null, // holds throttled connection setup function
_updateCursor: function(){ }, //no-op, overridden below
onAdd: function (map) {
this._cache = {};
this._idIndex = {};
L.TileLayer.prototype.onAdd.call(this, map);
this._throttleMove = L.Util.throttle(this._move, this.options.mouseInterval, this);
if (this.options.pointerCursor) {
this._updateCursor = function(cursor) { this._container.style.cursor = cursor; }
}
map.on('boxzoomstart', this._disconnectMapEventHandlers, this);
// have to throttle or we get an immediate click event on boxzoomend
map.on('boxzoomend', this._throttleConnectEventHandlers, this);
this._connectMapEventHandlers();
},
onRemove: function () {
var map = this._map;
map.off('boxzoomstart', this._disconnectMapEventHandlers, this);
map.off('boxzoomend', this._throttleConnectEventHandlers, this);
this._disconnectMapEventHandlers();
this._updateCursor('');
L.TileLayer.prototype.onRemove.call(this, map);
},
createTile: function(coords) {
this._loadTile(coords);
return document.createElement('div'); // empty DOM node, required because this overrides L.TileLayer
},
setUrl: function(url, noRedraw) {
this._cache = {};
return L.TileLayer.prototype.setUrl.call(this, url, noRedraw);
},
_connectMapEventHandlers: function(){
this._map.on('click', this._onClick, this);
this._map.on('mousemove', this._throttleMove, this);
},
_disconnectMapEventHandlers: function(){
this._map.off('click', this._onClick, this);
this._map.off('mousemove', this._throttleMove, this);
},
_throttleConnectEventHandlers: function() {
setTimeout(this._connectMapEventHandlers.bind(this), 100);
},
_update: function (center, zoom) {
L.TileLayer.prototype._update.call(this, center, zoom);
},
_loadTile: function (coords) {
var url = this.getTileUrl(coords);
var key = this._tileCoordsToKey(coords);
var self = this;
if (this._cache[key]) { return }
corslite(url, function(err, response){
if (err) {
self.fire('error', {error: err});
return;
}
var data = JSON.parse(response.responseText);
self._cache[key] = data;
L.Util.bind(self._handleTileLoad, self)(key, data);
}, true);
},
_handleTileLoad: function(key, data) {
// extension point
},
_onClick: function (e) {
this.fire('click', this._objectForEvent(e));
},
_move: function (e) {
if (e.latlng == null){ return }
var on = this._objectForEvent(e);
if (on._tileCharCode !== this._tileCharCode) {
if (this._mouseOn) {
this.fire('mouseout', {
latlng: e.latlng,
data: this._mouseOn,
_tile: this._mouseOnTile,
_tileCharCode: this._tileCharCode
});
this._updateCursor('');
}
if (on.data) {
this.fire('mouseover', on);
this._updateCursor('pointer');
}
this._mouseOn = on.data;
this._mouseOnTile = on._tile;
this._tileCharCode = on._tileCharCode;
} else if (on.data) {
this.fire('mousemove', on);
}
},
_objectForEvent: function (e) {
if (!e.latlng) return; // keyboard <ENTER> events also pass through as click events but don't have latlng
var map = this._map,
point = map.project(e.latlng),
tileSize = this.options.tileSize,
resolution = this.options.resolution,
x = Math.floor(point.x / tileSize),
y = Math.floor(point.y / tileSize),
gridX = Math.floor((point.x - (x * tileSize)) / resolution),
gridY = Math.floor((point.y - (y * tileSize)) / resolution),
max = map.options.crs.scale(map.getZoom()) / tileSize;
x = (x + max) % max;
y = (y + max) % max;
var tileKey = this._tileCoordsToKey({z: map.getZoom(), x: x, y: y});
var data = this._cache[tileKey];
if (!data) {
return {
latlng: e.latlng,
data: null,
_tile: null,
_tileCharCode: null
};
}
var charCode = data.grid[gridY].charCodeAt(gridX);
var idx = this._utfDecode(charCode),
key = data.keys[idx],
result = data.data[key];
if (!data.data.hasOwnProperty(key)) {
result = null;
}
return {
latlng: e.latlng,
data: result,
id: (result)? result.id: null,
_tile: tileKey,
_tileCharCode: tileKey + ':' + charCode
};
},
_dataForCharCode: function (tileKey, charCode) {
var data = this._cache[tileKey];
var idx = this._utfDecode(charCode),
key = data.keys[idx],
result = data.data[key];
if (!data.data.hasOwnProperty(key)) {
result = null;
}
return result;
},
_utfDecode: function (c) {
if (c >= 93) {
c--;
}
if (c >= 35) {
c--;
}
return c - 32;
},
_utfEncode: function (c) {
//reverse of above, returns charCode for c
//derived from: https://github.com/mapbox/glower/blob/mb-pages/src/glower.js#L37
var charCode = c + 32;
if (charCode >= 34) {
charCode ++;
}
if (charCode >= 92) {
charCode ++;
}
return charCode;
}
});
L.utfGrid = function (url, options) {
return new L.UTFGrid(url, options);
};
L.UTFGridCanvas = L.UTFGrid.extend({
options: {
idField: 'ID', // Expects UTFgrid to have a property 'ID' that indicates the feature ID
buildIndex: true, // requires above field to be set properly
fillColor: 'black',
shadowBlur: 0, // Number of pixels for blur effect
shadowColor: null, // Color for shadow, if present. Defaults to fillColor.
debug: false // if true, show tile borders and tile keys
},
_adjacentTiles: null,
onAdd: function (map) {
this._adjacentTiles = [];
L.UTFGrid.prototype.onAdd.call(this, map);
},
createTile: function(coords) {
this._loadTile(coords);
var tile = document.createElement('canvas');
tile.width = tile.height = this.options.tileSize;
if (this.options.debug) {
this._drawDefaultTile(tile.getContext('2d'), this._tileCoordsToKey(coords));
}
return tile;
},
_connectMapEventHandlers: function(){
L.UTFGrid.prototype._connectMapEventHandlers.call(this);
this.on('mouseover', this._handleMouseOver, this);
this.on('mouseout', this._handleMouseOut, this);
},
_disconnectMapEventHandlers: function(){
L.UTFGrid.prototype._disconnectMapEventHandlers.call(this);
this.off('mouseover', this._handleMouseOver, this);
this.off('mouseout', this._handleMouseOut, this);
},
_handleMouseOver: function (e) {
if (e._tile == null || e._tileCharCode == null){ return }
this._clearAdjacentTiles();
// currently over this tile:
var curTile = e._tile;
this._drawTile(curTile, parseInt(e._tileCharCode.split(':')[3]));
if (e.data && this._idIndex) {
// draw adjacent tiles
var id = e.data[this.options.idField];
var zoomLevel = curTile.split(':')[2];
if (!(id && this._idIndex[id] && this._idIndex[id][zoomLevel])) { return }
var idx = this._idIndex[id][zoomLevel];
for (var tileKey in idx) {
//TODO: screen out any tiles that are not currently visible?
if (tileKey !== curTile) {
this._drawTile(tileKey, idx[tileKey]);
this._adjacentTiles.push(tileKey);
}
}
}
},
_handleMouseOut: function (e) {
this._resetTile(e._tile);
this._clearAdjacentTiles();
},
_clearAdjacentTiles: function() {
// clear out any adjacent tiles that were drawn
if (this._adjacentTiles) {
for (var i = 0; i < this._adjacentTiles.length; i++) {
this._resetTile(this._adjacentTiles[i]);
}
this._adjacentTiles = [];
}
},
_handleTileLoad: function(tileKey, data) {
// build index: {<id: {zoomLevel: {tileKey: tileCharCode} } }
if (this.options.buildIndex) {
var id, props, idx;
var idField = this.options.idField;
var zoomLevel = tileKey.split(':')[2];
for (var i = 0; i < data.keys.length; i++) {
props = data.data[data.keys[i]];
if (props) {
id = props[idField];
if (id) {
if (this._idIndex[id] == null) {
this._idIndex[id] = {};
}
idx = this._idIndex[id];
if (idx[zoomLevel] == null) {
idx[zoomLevel] = {};
}
idx[zoomLevel][tileKey] = this._utfEncode(i);
}
}
}
}
},
_drawTile: function(tileKey, charCode) {
// for a given tile, find all pixels that match character and repaint
// TODO: request animation frame?
if (this._tiles[tileKey] == null){ return }
var canvas = this._tiles[tileKey].el;
var ctx = canvas.getContext('2d');
this._resetTile(tileKey);
var grid = this._cache[tileKey].grid;
ctx.fillStyle = this.options.fillColor;
var dim = this.options.tileSize / this.options.resolution;
// TODO: order of traversal here may be backwards? Do y then x? (are data column major or row major?)
//modified slightly from: https://github.com/mapbox/glower/blob/mb-pages/src/glower.js
for (var x = 0; x < dim; x++) {
for (var y = 0; y < dim; y++) {
if (grid[y].charCodeAt(x) === charCode) {
var sweep = 1;
while (y < 63 && grid[y + 1].charCodeAt(x) === charCode) {
y++;
sweep++;
}
ctx.fillRect(x * 4, (y * 4) - ((sweep - 1) * 4), 4, 4 * sweep);
}
}
}
if (this.options.shadowBlur) {
this._addShadow(canvas, ctx);
}
},
_resetTile: function(tileKey) {
// clear the canvas
if (this._tiles[tileKey] == null){ return }
var tile = this._tiles[tileKey].el;
tile.width = this.options.tileSize; // hard reset of canvas
if (this.options.debug) {
this._drawDefaultTile(tile.getContext('2d'), tileKey);
}
},
_drawDefaultTile: function(ctx, tileKey) {
// if this.options.debug, add tileKey text and borders
ctx.fillStyle = 'black';
ctx.fillText(tileKey, 20, 20);
ctx.strokeStyle = 'red';
ctx.beginPath();
ctx.moveTo(0, 0);
ctx.lineTo(255, 0);
ctx.lineTo(255, 255);
ctx.lineTo(0, 255);
ctx.closePath();
ctx.stroke();
},
_addShadow: function(canvas, ctx) {
ctx.shadowBlur = this.options.shadowBlur;
ctx.shadowColor = this.options.shadowColor || this.options.fillColor;
//Blur effect copied from glower - https://github.com/cutting-room-floor/glower/blob/mb-pages/src/glower.js#L108
ctx.globalAlpha = 0.7;
ctx.globalCompositeOperation = 'lighter';
var a = 1;
ctx.drawImage(canvas, -a, -a);
ctx.drawImage(canvas, a, a);
ctx.drawImage(canvas, 0, -a);
ctx.drawImage(canvas, -a, 0);
ctx.globalAlpha = 1;
}
});
L.utfGridCanvas = function (url, options) {
return new L.UTFGridCanvas(url, options);
};
// iNaturalist UTFGrid Compare
function freplacexyz(url,x,y,z) {
url = url.replace('{x}',x);
url = url.replace('{y}',y);
url = url.replace('{z}',z);
return url;
};
function fgetutfgrid(url) {
return fetch(url)
.then((response) => {
if (!response.ok) { throw new Error(response.status+': '+response.statusText); };
return response.json();
})
// .then((data) => { return data; })
.catch((err) => { console.error(err); });
};
L.GridLayer.UTFGridCompare = L.GridLayer.extend({
createTile: function (coords, done) {
var tile = document.createElement('canvas');
var tileSize = this.getTileSize();
tile.width = tileSize.x;
tile.height = tileSize.y;
var cellsPerTile = {x:64,y:64};
var cellSize = {x:tileSize.x/cellsPerTile.x,y:tileSize.y/cellsPerTile.y};
var ctx = tile.getContext('2d');
// default marker setups
var dmarker = {type:'relative',offset:{x:0,y:0},size:0.75,opacity:0.5};
var marker = null;
if (this.options.marker) {
marker = this.options.marker;
marker.type = marker.type || dmarker.type;
marker.size = marker.size || dmarker.size;
marker.offset = marker.offset || dmarker.offset;
marker.opacity = marker.opacity || dmarker.opacity;
}
else { marker = dmarker };
var offset = marker.offset;
// get UTFgrids
url0 = this.options.urlcompare;
url1 = this.options.url;
var prom0 = fgetutfgrid(freplacexyz(url0,coords.x,coords.y,coords.z));
var prom1 = fgetutfgrid(freplacexyz(url1,coords.x,coords.y,coords.z));
Promise.all([prom0,prom1]).then(function(utfgrid) {
//draw markers on the tile canvas
//note that this code was originally written to assume a 64x64 UTFgrid.
//although the UTFgrid is still 64x64, the associated "grid tile" is actually only 32x32.
//theoretically, a 2x2 set of cells from the UTFgrid should correspond to a single cell from the "grid tile"; however, that is not actually the case (see https://forum.inaturalist.org/t/open-test-of-map-tile-improvements/7833/88).
//so this code attempts to mimic a 32x32 "grid tile" by using the bottom-right cell from each 2x2 set of UTFgrid cells.
//for (cx=0;cx<cellsPerTile.x;cx++) {
for (cx=0;cx<cellsPerTile.x/2;cx++) {
//for (cy=0;cy<cellsPerTile.y;cy++) {
for (cy=0;cy<cellsPerTile.y/2;cy++) {
//var cell = {x:cx,y:cy};
var cell = {x:cx*2+1,y:cy*2+1};
//for details about decoding the UTFgrid, see https://github.com/mapbox/utfgrid-spec/blob/master/1.2/utfgrid.md
var d = [];
for (u=0;u<utfgrid.length;u++) {
var i = utfgrid[u].grid[cell.y].charCodeAt(cell.x);
i = i-((i>=93)?34:(i>=35)?33:32);
d.push(utfgrid[u].data[utfgrid[u].keys[i]]);
};
for (j=0;j<d.length;j++) { d[j] = d[j] ? d[j].cellCount||0 : 0; } // set d = cellCount (set to 0 if undefined)
var markerColor = 0; // default to black
ctx.beginPath();
var circleRadius = cellSize.x*marker.size;
ctx.arc(cell.x*cellSize.x+offset.x,cell.y*cellSize.y+offset.y,circleRadius,0,2*Math.PI,false);
if ( d[0]<=0 ) { markerColor = 'rgba(128,128,128,0.00)'; } // no color
// else if ( d[1]<=0 ) { markerColor = `rgba(0,0,255,${marker.opacity})`; } // blue
else {
var f = d[1]/d[0];
f = (f<=0)?1:(f>=1)?0:1-f;
markerColor = `hsla(${(f*240)},100%,50%,${marker.opacity})`; // high (1.0) is red, low (0.0) is blue
ctx.fillStyle = markerColor;
ctx.fill();
};
ctx.strokeStyle = markerColor;
ctx.stroke();
};
};
});
// asynchronous call
setTimeout(function() {
done(null, tile);
}, 1000);
return tile;
}
});
L.gridLayer.utfGridCompare = function (options) {
return new L.GridLayer.UTFGridCompare(options);
};
</script>
</head>
<body>
<script>
//get parameters from the url
let winurlstr = window.location.href;
let winurlsearchstr = window.location.search;
let winurlexsearchstr = winurlstr.replace(winurlsearchstr,'');
let winurlparams = new URLSearchParams(winurlsearchstr.substring(1));
var taxon_id = winurlparams.get('taxon_id');
taxon_id = (taxon_id===null?null:taxon_id.split(',')[0]);
var place_id = winurlparams.get('place_id');
place_id = (place_id===null?null:place_id.split(',')[0]);
var centerlat = winurlparams.get('centerlat');
var centerlng = winurlparams.get('centerlng');
var defaultzoom = winurlparams.get('defaultzoom');
var showtaxonplace = winurlparams.get('showtaxonplace') || 'false';
var showtaxonrange = winurlparams.get('showtaxonrange') || 'false';
var showexpectednearby = winurlparams.get('showexpectednearby') || 'false';
var showplace = winurlparams.get('showplace') || 'false';
var view = winurlparams.get('view') || 'default';
var compexclparam = winurlparams.get('compare_exclude_param');
var thresholded = winurlparams.get('thresholded') || 'true'; // even though the default in the API is false, set the default to true, since we're going to usually want to see Expected Nearby rather than Unthresholded
winurlparams.delete('centerlat');
winurlparams.delete('centerlng');
winurlparams.delete('defaultzoom');
winurlparams.delete('showtaxonplace');
winurlparams.delete('showtaxonrange');
winurlparams.delete('showexpectednearby');
winurlparams.delete('showplace');
winurlparams.delete('view');
winurlparams.delete('compare_exclude_param');
winurlparams.delete('thresholded');
let compareurlparams = new URLSearchParams(winurlparams);
if (compexclparam) { for (p of compexclparam.split(',')) { compareurlparams.delete(p); }; };
function fdate(str) {
str = str.replace(/t/i,' '); //replaces T (case insensitive) with a space
str = str.replace(/([+-]\d{2}\:?\d{2})/,' ($1)'); //puts parenthesis around time zone offset
str = str.replace(/z/i,' (+00:00)'); //replaces Z (case insensitve) with UTC
str = str.replace('+00:00','±00:00');
return str;
};
function fround(num,places) {
var n = num*1;
return n.toFixed(places);
};
function furl(url,txt=url) { return '<a href="'+url+'">'+txt+'</a>'; };
function faddelem(etype,eparent=null,eclass=null,eid=null,ehtml=null,etext=null) {
var eobj = document.createElement(etype);
if (eclass!==null) { eobj.classList = eclass };
if (eid!==null) { eobj.id = eid };
if (ehtml!==null) { eobj.innerHTML = ehtml };
if (etext!==null) { eobj.innerText = etext };
if (eparent!==null) { eparent.appendChild(eobj); };
return eobj;
};
function ffetch(url) {
return fetch(url)
.then((response) => {
if (!response.ok) { throw new Error(response.status+': '+response.statusText); };
return response.json();
})
.then((data) => { return data; })
.catch((err) => { console.error(err); });
};
let inat_urlbase = 'https://api.inaturalist.org/v1/';
if (winurlparams=="") {
var div = faddelem('div',document.body,null,'info');
faddelem('h1',div,null,null,'Map of iNaturalist Observations');
faddelem('p',div,null,null,'This page displays a map of iNaturalist observations. Clicking on any observation marker opens a pop-up window which provides basic details of the observation');
faddelem('p',div,null,null,'This page requires that you input at least one filter parameter in the URL. For example, if the URL of this page is '+winurlexsearchstr +', and you want to see research grade ocotillo observations, then you would navigate to '+furl(winurlexsearchstr+'?taxon_id=49325&quality_grade=research')+' in your web browser. This page will accept most parameters documented for the '+ furl(inat_urlbase+'docs/#!/Observations/get_observations','iNaturalist API Get Observations Endpoint')+ '.');
faddelem('p',div,null,null,'If place_id is included as a parameter, then the place polygon will be available as an optional layer in the map. If taxon_id is included as a parameter, then taxon places and taxon range will be available as optional layers in this map (if they have been defined in iNaturalist).');
faddelem('p',div,null,null,'If a special "view" parameter is set to "=elevation", then the map will display with the USGS topo basemap (with contours in feet) by default, and the info pop-ups will include elevation (sourced from the '+furl('https://epqs.nationalmap.gov/','USGS elevation point query service')+'). USGS does not provide elevations outside of the United States. In cases where the USGS returns no data, the page will fall back to the '+furl('https://open-elevation.com/','Open-Elevation API')+'. As an example, if you want to see mountain goats in the United States, then you would navigate to '+furl(winurlexsearchstr+'?view=elevation&taxon_id=42414&place_id=1')+' in your web browser.');
faddelem('p',div,null,null,'If a special "view" parameter is set to "=ecolandunit", then the map will display with a USGS Ecological Land Unit overlay on a dark basemap by default, and the info pop-ups will include USGS ELU information (sourced from '+furl('https://www.usgs.gov/centers/geosciences-and-environmental-change-science-center/science/global-ecosystems','USGS Global Ecosystems')+'). This should work on any point of land worldwide. As an example, if you want to see maples around the world, then you would navigate to '+furl(winurlexsearchstr+'?view=ecolandunit&taxon_id=47727&defaultzoom=2')+' in your web browser.');
faddelem('p',div,null,null,'If a special "view" parameter is set to "=heatmap", then the map will show a heatmap view of observations on a muted-color basemap. By default, clicking the heatmap will not open a info pop-up. As an example, to get an idea of where user kueda has made observations, you would navigate to '+furl(winurlexsearchstr+'?view=heatmap&user_id=kueda')+' in your web browser.');
faddelem('p',div,null,null,'If a special "view" parameter is set to "=subsetratio", then the map will compare a gridded view of one set of observations (the subset, defined in the URL) to another set (the superset, defined by a required special "compare_exclude_param" parameter, which removes one or more parameters from the subset parameter list). The color of the markers will vary based on the ratio of subset to superset for each cell (red=1.0 and blue=0.0), and they will appear on top of a gray basemap. As an example, to compare research grade plant observations to verifiable plant observations, you would navigate to '+furl(winurlexsearchstr+'?view=subsetratio&verifiable=true&quality_grade=research&taxon_id=47126&compare_exclude_param=quality_grade')+' in your web browser. Note that if you use exclusion filter parameters (ex. not_user_id) in your subset and remove them from the superset, then you may get unexpected results (because the subset would no longer be a true subset).'); faddelem('p',div,null,null,'There are 2 final sets of special parameters: centerlat, centerlng, and defaultzoom can be used to set the default map center and zoom level when the map is first opened; and showtaxonplace, showtaxonrange, showexpectednearby, and showplace can be set to true to display specific layers by default.');
}
else {
var mapdiv = faddelem('div',document.body,null,'mapid');
// iNat Observation Layer, using grid markers at lower zooms and points at higher zooms
// let inat_circles = {url:inat_urlbase+'colored_heatmap/{z}/{x}/{y}.png',description:'iNaturalist Observations (Density Circles)',attribution:'<a href="https://api.inaturalist.org/v1/docs/#!/Observation_Tiles/get_colored_heatmap_zoom_x_y_png">iNaturalist observation data</a>'};
let inat_heat = {url:inat_urlbase+'heatmap/{z}/{x}/{y}.png',description:'iNaturalist Observations (Heatmap)',attribution:'<a href="https://api.inaturalist.org/v1/docs/#!/Observation_Tiles/get_heatmap_zoom_x_y_png">iNaturalist observation data</a>'};
// let gbif_density_point_py = {url:'https://api.gbif.org/v2/map/occurrence/density/{z}/{x}/{y}@1x.png?srs=EPSG:3857&style=purpleYellow.point&publishingOrg=28eb1a3f-1c15-4a95-931a-4af90ecb574d',description:'iNaturalist Observations in GBIF',attribution:'<a href="https://www.gbif.org/developer/maps">GBIF occurrence data</a>'};
// var l_inat_circles = L.tileLayer(inat_circles.url+'?'+winurlparams,{minZoom:2, maxZoom:20, attribution:inat_circles.attribution});
var l_inat_heat = L.tileLayer(inat_heat.url+'?'+winurlparams,{minZoom:0, maxZoom:20, attribution:inat_heat.attribution});
// var l_gbif = L.tileLayer(gbif_density_point_py.url,{minZoom:2, maxZoom:20, attribution:gbif_density_point_py.attribution});
let inat_points = {url:inat_urlbase+'points/{z}/{x}/{y}.png',description:'iNaturalist Observations (Points)',attribution:'<a href="https://api.inaturalist.org/v1/docs/#!/Observation_Tiles/get_points_zoom_x_y_png">iNaturalist observation data</a>'};
let inat_grid = {url:inat_urlbase+'grid/{z}/{x}/{y}.png',description:'iNaturalist Observations (Grid)',attribution:'<a href="https://api.inaturalist.org/v1/docs/#!/Observation_Tiles/get_grid_zoom_x_y_png">iNaturalist observation data</a>'};
var l_inat_points = L.tileLayer(inat_points.url+'?'+winurlparams,{minZoom:0,maxZoom:20, attribution:inat_points.attribution});
var l_inat_grid = L.tileLayer(inat_grid.url+'?'+winurlparams,{minZoom:0,maxZoom:20,attribution:inat_grid.attribution});
var l_inat_obs_points = L.tileLayer(inat_points.url+'?'+winurlparams,{minZoom:10,maxZoom:20, attribution:inat_points.attribution});
var l_inat_obs_grid = L.tileLayer(inat_grid.url+'?'+winurlparams,{minZoom:2,maxZoom:9,attribution:inat_grid.attribution});
var g_inat_obs = L.layerGroup([l_inat_obs_grid,l_inat_obs_points]);
// iNat Observation Layer mods
var l_inat_heat_mod_transparent = L.tileLayer.styleFilter(inat_heat.url+'?'+winurlparams,{minZoom:0, maxZoom:20, attribution:inat_heat.attribution, filter:'opacity(50%)'});
// iNat UTFGrid Selection
// (hover to see selected area, and click to view selected observation)
async function fpopup(obs,count) {
var s = (obs.photos.length==0) ? '[No Photo]' : '<img src="'+obs.photos[0].url+'" />';
s += (obs.photos.length>1) ? ' ['+obs.photos.length+']' : '';
s += '<br />observation #: <a target="_blank" href="'+obs.uri+'">'+obs.id+'</a> (grade: '+obs.quality_grade+')';
s += '<br />taxon: ' + ((obs.taxon==null) ? '[Unknown]' : obs.taxon.preferred_common_name ? (obs.taxon.preferred_common_name+' ('+obs.taxon.name+')') : obs.taxon.name );
s += '<br />observer: '+obs.user.login;
// s += '<br />location: '+obs.place_guess;
s += '<br />coordinates: '+fround(obs.geojson.coordinates[1],6)+', '+fround(obs.geojson.coordinates[0],6);
s += (obs.positional_accuracy==null) ? '' : ' ('+fround(obs.positional_accuracy,1)+'m)';
if (view==='elevation') {
var elevationurl = 'https://epqs.nationalmap.gov/v1/json?y='+obs.geojson.coordinates[1]+'&x='+obs.geojson.coordinates[0]+'&output=json&units=Feet';
var elevation = await ffetch(elevationurl)
.then((data) => {
return data;
});
if ((elevation?elevation.value:-1000000)>-1000000) { s += '<br />elevation: '+ (fround(elevation.value,1)+'ft, '+ fround(elevation.value*0.3048,1) + 'm'); }
else {
var elevationurl_fallback = 'https://api.open-elevation.com/api/v1/lookup?locations='+obs.geojson.coordinates[1]+','+obs.geojson.coordinates[0];
var elevation_fallback = await ffetch(elevationurl_fallback)
.then((data) => {
return data?.results[0];
});
s += '<br />elevation: '+ (elevation_fallback?(elevation_fallback.elevation+'m'):'[Unknown]');
};
};
s += '<br />observed: '+((obs.time_observed_at==null) ? ((obs.observed_on==null) ? '[Unknown]': obs.observed_on) : fdate(obs.time_observed_at));
s += '<br />created: '+((obs.created_at==null) ? obs.created_at_details.date : fdate(obs.created_at));
s += '<br />last updated: '+fdate(obs.updated_at);
// if (obs.description==null) {}
// else if (obs.description.length < 200) {s += '<br />'+obs.description }
// else {s += '<br />'+(obs.description.substring(0,191)+'... (more)')};
if (view==='ecolandunit') {
function latlngtoxy(latlng) { return L.CRS.EPSG3857.project(latlng); };
let mapExtent = mymap.getBounds();
let pointXY = latlngtoxy(L.latLng(obs.geojson.coordinates[1],obs.geojson.coordinates[0]));
var ecoluurl = `https://rmgsc.cr.usgs.gov/arcgis/rest/services/globalelus/MapServer/identify?geometry={"x":${pointXY.x},"y":${pointXY.y}}&geometryType=esriGeometryPoint&sr=102100&layers=all:4&tolerance=3&mapExtent=${latlngtoxy(mapExtent.getNorthWest()).x},${latlngtoxy(mapExtent.getNorthWest()).y},${latlngtoxy(mapExtent.getSouthEast()).x},${latlngtoxy(mapExtent.getSouthEast()).y}&imageDisplay=1,1,96&returnGeometry=false&returnZ=false&returnM=false&returnUnformattedValues=false&f=pjson`;
var ecoludetails = await ffetch(ecoluurl)
.then((data) => {
return data.results[0].attributes;
});
s += '<hr /><details>'
s += '<summary>Ecological Land Unit: ' + (ecoludetails ? (ecoludetails['Raster.ELU'] ?? 'N/A') : 'N/A') + '</summary>';
s += '- Bioclimate: ' + (ecoludetails ? (ecoludetails['Raster.ELU_Bio_De'] ?? 'N/A') : 'N/A');
s += '<br /> - Land Cover: ' + (ecoludetails ? (ecoludetails['Raster.ELU_GLC_De'] ?? 'N/A') : 'N/A');
s += '<br /> - Land Form: ' + (ecoludetails ? (ecoludetails['Raster.ELU_LF_Des'] ?? 'N/A') : 'N/A');
s += '<br /> - Land Lithology: ' + (ecoludetails ? (ecoludetails['Raster.ELU_Lit_De'] ?? 'N/A') : 'N/A');
s += '</details>';
s += '<hr /><details>';
s += '<summary>Ecological Facet: ' + (ecoludetails ? (ecoludetails['Raster.EF'] ?? 'N/A') : 'N/A') + '</summary>';
s += '- Bioclimate: ' + (ecoludetails ? (ecoludetails['Raster.EF_Bio_Des'] ?? 'N/A') : 'N/A');
s += '<br /> - Land Cover: ' + (ecoludetails ? (ecoludetails['Raster.EF_GLC_Des'] ?? 'N/A') : 'N/A');
s += '<br /> - Land Form: ' + (ecoludetails ? (ecoludetails['Raster.EF_LF_Desc'] ?? 'N/A') : 'N/A');
s += '<br /> - Land Lithology: ' + (ecoludetails ? (ecoludetails['Raster.EF_Lit_Des'] ?? 'N/A') : 'N/A');
s += '</details>';
var ecosysdetails;
let contSets = ['US','SA','AF'];
for (let cont of contSets) {
var ecosysurl = `https://rmgsc.cr.usgs.gov/arcgis/rest/services/cont${cont}/MapServer/identify?geometry={"x":${pointXY.x},"y":${pointXY.y}}&geometryType=esriGeometryPoint&sr=102100&layers=all:0,1,2,3,4&tolerance=3&mapExtent=${latlngtoxy(mapExtent.getNorthWest()).x},${latlngtoxy(mapExtent.getNorthWest()).y},${latlngtoxy(mapExtent.getSouthEast()).x},${latlngtoxy(mapExtent.getSouthEast()).y}&imageDisplay=1,1,96&returnGeometry=false&returnZ=false&returnM=false&returnUnformattedValues=false&f=pjson`;
ecosysdetails = await ffetch(ecosysurl)
.then((data) => {
return ((data.results?.length||0)===0) ? null : data.results;
});
if (ecosysdetails) { break; };
};
if (ecosysdetails) {
s += '<hr /><details>';
s += '<summary>Ecosystem: ' + (ecosysdetails[0]?.attributes ? (ecosysdetails[0]?.attributes['Raster.code_desc'] ?? 'N/A') : 'N/A') + '</summary>';
s += '- Bioclimate: ' + (ecosysdetails[1].attributes ? (ecosysdetails[1].attributes['Raster.code_desc'] ?? 'N/A') : 'N/A');
s += '<br /> - Land Form: ' + (ecosysdetails[2]?.attributes ? (ecosysdetails[2]?.attributes['Raster.code_desc'] ?? 'N/A') : 'N/A');
s += '<br /> - Land Lithology: ' + (ecosysdetails[3]?.attributes ? (ecosysdetails[3]?.attributes['Raster.code_desc'] ?? 'N/A') : 'N/A');
if (ecosysdetails.length>4) {s += '<br /> - Topographic Position: ' + (ecosysdetails[4]?.attributes ? (ecosysdetails[4]?.attributes['Raster.code_desc'] ?? 'N/A') : 'N/A'); };
s += '</details>';
};
};
if (count>1) {
s += '<hr />'
s += `This marker also denotes ${count-1} older observation${(count>2)?'s':''}.`
};
L.popup().setLatLng([obs.geojson.coordinates[1],obs.geojson.coordinates[0]])
.setContent(s).openOn(mymap);
};
var u_inat_options = {
resolution: 4,
pointerCursor: true,
mouseInterval: 66, // Delay for mousemove events
minZoom:0,
maxZoom:20,
};
var u_inat_points = L.utfGrid(inat_urlbase+'points/{z}/{x}/{y}.grid.json?'+winurlparams, { ...u_inat_options, minZoom:10 });
u_inat_points.on("click", function(e) { // "mouseover" and "mouseout" events not used here
if (e.data) {
Promise.all([
ffetch(inat_urlbase+'observations/'+e.data.id),
Promise.resolve(e.data.cellCount)
])
.then ((data) => { fpopup(data[0].results[0],data[1]); });
};
});
var u_inat_points_all = L.utfGrid(inat_urlbase+'points/{z}/{x}/{y}.grid.json?'+winurlparams, u_inat_options);
u_inat_points_all.on("click", function(e) { // "mouseover" and "mouseout" events not used here
if (e.data) {
Promise.all([
ffetch(inat_urlbase+'observations/'+e.data.id),
Promise.resolve(e.data.cellCount)
])
.then ((data) => { fpopup(data[0].results[0],data[1]); });
};
});
var u_inat_grid = L.utfGrid(inat_urlbase+'grid/{z}/{x}/{y}.grid.json?'+winurlparams, { ...u_inat_options, minZoom:2, maxZoom:9 });
u_inat_grid.on("click", function(e) { // "mouseover" and "mouseout" events not used here
if (e.data) {
Promise.all([
ffetch(inat_urlbase+'observations/'+e.data.id),
Promise.resolve(e.data.cellCount)
])
.then ((data) => { fpopup(data[0].results[0],data[1]); });
};
});
var u_inat_grid_all = L.utfGrid(inat_urlbase+'grid/{z}/{x}/{y}.grid.json?'+winurlparams, u_inat_options);
u_inat_grid_all.on("click", function(e) { // "mouseover" and "mouseout" events not used here
if (e.data) {
Promise.all([
ffetch(inat_urlbase+'observations/'+e.data.id),
Promise.resolve(e.data.cellCount)
])
.then ((data) => { fpopup(data[0].results[0],data[1]); });
};
});
var u_inat_grid_superset = L.utfGrid(inat_urlbase+'grid/{z}/{x}/{y}.grid.json?'+compareurlparams, u_inat_options);
u_inat_grid_superset.on("click", function(e) { // "mouseover" and "mouseout" events not used here
if (e.data) {
Promise.all([
ffetch(inat_urlbase+'observations/'+e.data.id),
Promise.resolve(e.data.cellCount)
])
.then ((data) => { fpopup(data[0].results[0],data[1]); });
};
});
var v_inat_options = {
idField: 'id', // Expects UTFgrid to have a property 'ID' that indicates the feature ID
buildIndex: true, // requires above field to be set properly
fillColor: 'black',
shadowBlur: 0, // Number of pixels for blur effect
shadowColor: null, // Color for shadow, if present. Defaults to fillColor.
debug: false, // if true, show tile borders and tile keys
minZoom:0,
maxZoom:20,
};
var v_inat_points = L.utfGridCanvas(inat_urlbase+'points/{z}/{x}/{y}.grid.json?'+winurlparams, { ...v_inat_options, minZoom:10, });
var v_inat_points_all = L.utfGridCanvas(inat_urlbase+'points/{z}/{x}/{y}.grid.json?'+winurlparams, v_inat_options);
var v_inat_grid = L.utfGridCanvas(inat_urlbase+'grid/{z}/{x}/{y}.grid.json?'+winurlparams, { ...v_inat_options, minZoom:2, maxZoom:9 });
var v_inat_grid_all = L.utfGridCanvas(inat_urlbase+'grid/{z}/{x}/{y}.grid.json?'+winurlparams, v_inat_options);
var v_inat_grid_superset = L.utfGridCanvas(inat_urlbase+'grid/{z}/{x}/{y}.grid.json?'+compareurlparams, v_inat_options);