Implementación de un observatorio ambiental web gis para el Ecuador mediante la aplicación de sensores remotos

Abstract

The current work was based on using remote sensors and different data sets to create a Google Earth Engine web application which are collected over approximately 40 years, which were used to allow this web application to focus on facilitating environmental impact assessment in different regions of Ecuador. The first chapter collects all the information from various remote sensors (either Landsat, Sentinel, etc.). We also studied the JavaScript programming language for programming the development and execution of geospatial processes based on global databases used by Google Earth Engine. The second point was to search for the most useful spatial data to perform the application using Landsat (4, 5, 7, 8 and 9), Sentinel, Copernicus, HydroSHEDS and Nasadem_Hg data. The remote sensing bands were also used to obtain the Normalized Difference Vegetation Index (NDVI), Normalized Difference Water Index (NDWI) and Normalized Difference Snow Index (NDSI), which were used in the map of Ecuador and its different provinces and in conjunction with several points such as land use, forest changes, digital elevation models, hydrological basins, etc. The result was the Web application entitled Environmental Observatory which allows us to view images from different catalogs which helps to visualize and download images from all over Ecuador. Although the application does not allow direct downloading, another method was used which allows exporting to Google drive and thus to download the satellite images and be able to use them in other programs.