“Northeast quadrant” appears to usually refer to a section of Washington, D.C. Here I mean the northeastern part of the contiguous U.S. (if one were to fold of map of it in half twice, the upper-right part, more or less).
This was generated using data from NASA’s Shuttle Radar Topography
Mission. The actual tiles come from CGIAR-SCI. I used gdalwarp
to reproject and combine the tiles:
gdalwarp \ -r lanczos \ -te -1270000 -661458 1270000 661458 \ -t_srs "+proj=aea \ +lat_1=29.5 \ +lat_2=45.4 \ +lat_0=44.0 \ +lon_0=-83.0 \ +x_0=0 +y_0=0" \ -ts 960 0 \ $(TILES) \ relief.tiff
where $(TILES)
is a list of the appropriate tif files, srtm_22_05.tif
,
srtm_21_05.tif
and so on (19 in all). Then I used gdaldem
to generate the
hill shade:
gdaldem \ hillshade \ relief.tiff \ hill-relief-shaded.tiff \ -z 20 -az 90
Finally, I used Photoshop to remove a few “nodata” void areas in the Great Lakes and the ocean.
Void-filled seamless SRTM data V1, 2004, International Centre for Tropical Agriculture (CIAT), available from the CGIAR-CSI SRTM 90m Database: http://srtm.csi.cgiar.org and http://www.ambiotek.com/topoview