My goal is to download a gif file from this webpage:
Then crop it to the known latlon bounds of 75N,45S,35W,70E, convert to geotif, and then project to EPSG:4326. The map says "Mer", but how does one figure out what EPSG to use in gdal when converting to geotiff? I've tried many: 3395,3857,3785, etc, but none seem to work properly. Here are the commands I've used:
gdal_translate -of GTiff -a_srs EPSG:3857 -a_ullr -35 75 70 -45 2104_cropped.png 2104_3857.tiff gdalwarp -s_srs EPSG:3857 -t_srs EPSG:4326 2104_3857.tiff 2104_4326.tiff
I get no warning with gdalwarp, but the image never warps, it stays the same. When i overlay them on the maps that expect EPSG:4326, the maps to don't line up.