I would like to calculate the Aridity Index for a number of GPS coordinates. I have downloaded the files required to calculate Aridity Index from http://www.cgiar-csi.org/data/global-aridity-and-pet-database. These files come in .adf format. Is there a way to convert these into GeoTiffs or similar? I would like to obtain the values in R since I'm unfamiliar with ArcGIS.
https://mygeodata.cloud/converter/adf-to-geotiff
https://pvanb.wordpress.com/2010/03/15/esri-rasters-in-grass-or-qgis/
It seems you are working with ESRI ArcInfo format. It Is a quite strange raster format because you can have floating pointing grids, or VAT vrids. The last is akind of combination of a binary grid + a database.. If you have a VAT you will probably your raster is only a classification result and the VAT its description. VAT means Value Attribute Table. You also have to take in account that esri grid is a little complex format. I think your grid is composed at least of two folders: INFO and GRID. At INFO you have your VAT table and other user data, at GRID whatever the name of the grid your raster + metada and others parameters. You have two options
1) open the data with arcgis
2) Try with Qgis, it opens every kind of data. You can donwload it for free.
But in both cases do not forget to see if you have a floating point or VAT grid.
I need help in facing a problem in calculating time series global Aridity index from Prec+Pet raster in Arcgis. The results of output raster comes in ranges (0-570) using raster calculator, which is different from the ESRI calculated results i.e. 0.2-0.5. So how to adjust I need guidance...
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