from http://gmt.soest.hawaii.edu/doc/5.2.1/grdgradient.html grdgradient grdgradient - Compute directional derivative or gradient from a grid Synopsis grdgradient in_grdfile -Gout_grdfile [ -Aazim[/azim2] ] [ -D[a][c][o][n] ] [ -E[s|p]azim/elev[/ambie…

[转载]GMT地形数据总结     原文地址:GMT地形数据总结作者:Jason 转载:http://seisman.info/gmt-topo-grid-datas.html   目前接触到的地形数据主要有三种:etopo.GTOPO30以及SRTM.按照精度从低到高排序如下: etopo5:GMT网格数据之etopo5 etopo2:GMT网格数据之ETOPO2v2 etopo1:GMT网格数据之ETOPO1 GTOPO30:GMT网格数据之GTOPO30 SRTM30_PLUS: 全球地形…

set ps=test.psset J=M4i set R=73/135.5/10/54rem gmt gmtset  FONT_ANNOT_PRIMARY 8p FONT_TITLE 8p  gmt gmtset FORMAT_GEO_MAP ddd:mmgmt gmtset  MAP_FRAME_TYPE fancy gmt gmtset  MAP_FRAME_WIDTH 0.1cgmt gmtset GRID_CROSS_SIZE_PRIMARY = 0c  gmt gmtset TICK…

http://gmt-tutorials.org/coloring_topography.html gmt grdcut topo15.grd -R -Gcut gmt grdgradient cut -Ne0. -A50 -Glight gmt grdimage cut -R -J -Ilight -Ccut.cpt -Q -O -K…