全球地形资料img
ThisreadmefilecontainsinformationontheETOPO1binarygridformats.ETOPO1comesintwodifferentbinaryformats:2-byte/16-bitinteger(i2)and4-byte/32-bitfloat(f4);floatreferstothefileformat,nottheelevationvaluesinthegrids,whichhavebeenroundedtowholeintegersforallversions.Eachzipfilecontainst