I would like to download GPW and GRUMP data, but I'd like to know if it is possible to download files by some coordinate extent, rather than by country?
GRUMPv1 Population Density 2000 with BBOX extent: L:123,T:43.999,B:37,R:130.999
http://sedac.ciesin.columbia.edu/geoserver/wcs?&SERVICE=WCS&VERSION=1.0.0&REQUEST=GetCoverage&Coverage=grump-v1:grump-v1-population-density_2000&CRS=EPSG:4326&BBox=123,37,130.999,43.999&resx=0.0083333&resy=0.0083333&FORMAT=GeoTIFF
GPWv3 Population Density 2000 with BBOX extent: L:123,T:43.999,B:37,R:130.999
http://sedac.ciesin.columbia.edu/geoserver/wcs?&SERVICE=WCS&VERSION=1.0.0&REQUEST=GetCoverage&Coverage=gpw-v3:gpw-v3-population-density_2000&CRS=EPSG:4326&BBox=123,37,130.999,43.999&resx=0.041665&resy=0.041665&FORMAT=GeoTIFF