1. How to rescale the hydrological data (via- GTOPO30 Format) and land cover / vegetational data (available in TIF file) to a data type of unit 8- 0 to 255
(if possible with the help of DIVA-GIS, or through some freely available softwares) or any manual / paper/ software to do these intermediate steps.
so that it can generate a file similar to the worldclim data set (2.5' / 30' arc) - a polygon / raster format
2. How to convert all these (hydro/ veg/ climatic) variables to a excelsheet format, so that I can run a principal component analyses for the reduction of parameter appropriate for my sample data to run a MAXENT model?
Please be elaborative as I am in the learning process. Thank you.
well i dont have arc gis ,,,,,,,, are there any other ways for the conversion, let me know.
Dear Pavithra P Nayak,
How about OpenSource QGIS? You can download it and simply install from http://qgis.org/downloads/
I prefer 1.8.0. This GIS ALSO supports GDAL (other versions too).
Just run c:\...\QuantumGISLisboa\OSGeo4W.bat
(kinda WinCmd with integrated GDAL binaries)
Then type and run command
gdal_translate -ot UInt16 -b 1 -b 2 -b 3 ... -b N -scale 0 16000 0 255 -a_nodata 0 -of GTiff INPUT.TIF OUTPUT.TIF
You can process such many channels, as you need to put into OUTPUT.TIF.
Last will be UInt16 with data range from 0 to 255.
(UInt8 - unsupported DataType)
(see more here http://www.gdal.org/gdal_translate.html)
Any questions - just ask!
Ruslan, though i am not a programmer...... will just make a try with your suggestions and get back to you .........
QGIS is easy to use and there is a huge online community
you can export your raster as an aaigrid/ascii - to use in Maxent
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