I have trouble bringing land cover data from the USGS into a "decent" coordinate system.
I obtained an .img file of the "Global Land Cover Characteristics Data Base Version 2.0" from http://edc2.usgs.gov/glcc/tabgeo_globe.php. I renamed the file to *.bsq and created an .hdr file according to the following description on the USGS website:
9.2 Geographic Projection Parameters
The data dimensions of the Geographic projection for the global land cover characteristics data set are 21,600 lines (rows) and 43,200 samples (columns) resulting in a data set size of approximately 933 megabytes for 8-bit (byte) images. The following is a summary of the map projection parameters used for the Geographic projection:
Projection Type: Geographic
Units of measure: arc seconds Pixel Size: 30 arc seconds Radius of sphere: 6370997 m. XY corner coordinates (center of pixel) in projection units (arc seconds): Lower left: (-647985, -323985) Upper left: (-647985, 323985) Upper right: (647985, 323985) Lower right: (647985, -323985)
So I have created the following .hdr file:
nrows 21600 ncols 43200 nbands 1 nbits 8 layout bsq skipbytes 0 ulxmap -647985 ulymap 323985 xdim 30 ydim 30
When I now load the file into QGIS, it looks fine. But to convert the file from the original CRS to one of my choosing, I would have to know the original CRS in the first place. And this is where I am stuck: What is the CRS of the "Global Land Cover Characteristics Data Base Version 2.0" database? Can someone tell me from the aforementioned projection infos? I tried EPSG:4326 and EPSG:3857, but they do not seem to be correct.