index.Rmd

--- 
title: "VICAL Guide: VEGETATION INDICES CALCULATOR"
author: "INIFAP: Sergio Jiménez-Jiménez; Mariana Marcial-Pablo; Waldo Ojeda-Bustamante; Ernesto Sifuentes-Ibarra; Marco Inzunza-Ibarra, Ignacio Sánchez-Cohen"
date: "`r Sys.Date()`"
site: bookdown::bookdown_site
logo: ./images/LogoVICAL.png
lang: en
output: bookdown::gitbook
header-includes:
  - \usepackage{titling}
  - \pretitle{\begin{center}
    \includegraphics[width=2in,height=2in]{./images/LOGO2.png}\LARGE\\}
  - \posttitle{\end{center}}
geometry: margin=2cm
documentclass: book
bibliography: [book.bib, packages.bib]
biblio-style: apalike
link-citations: yes
github-repo: CenidRaspaRiego/vical_en
description: "This is a VICAL guide"
---

# Welcome {-}


This site is a guide to use the **VICAL** tool developed within Google Earth Engine (GEE). VICAL calculates **online** 23 vegetation indices (commonly used in agricultural applications) of any polygon(s) in the world (digitized by the user or vector file) using LandSat and Sentinel-2 images. This is done without the user downloading/uploading satellite images of writing a single line of code, they just need to have an internet connection. 


A web application is also available <https://inifapcenidraspa.users.earthengine.app/view/vical>.


```{r fig2, fig.cap='Vista principal de VICAL', echo=FALSE, message=FALSE, warning=FALSE, out.width="90%", fig.align = 'center'}
knitr::include_graphics("./images/Captura2.png")
```

This work was developed by researchers from **INIFAP CENID-RASPA** and **CEVAF**. Among the improvements planned for VICAL is that are intended for VICAL is that through experimentation the calibration of biophysical variables of interest for various crops is achieved using _vegetation indices (IV)_; and these results are available in **VICAL** to be useful to other people and thus they can easily monitor variables related to irrigation engineering. 


_Please check back occasionally for new GEE applications, example scripts, and VICAL updates. You might try doing a hard refresh on the site to make sure you see recent changes (what you’re looking at might be a previously cached version of the site)_

_If you have any questions or suggestions or wish to participate in the project, you can write to the email **jimenez.sergio@inifap.gob.mx**_