dowload shp(gis) file,plot by GMT

download road/railroad/landover/airport/elevation data from USGS.
https://nationalmap.gov/small_scale/atlasftp.html?openChapters=chptrans#chptrans
load file roadl_usa.shp.tar.gz
tar -xzvf  roadl_usa.shp.tar.gz
我的电脑ogr2ogr是GDAL 2.2.1
ogr2ogr -f "OGR_GMT" road.gmt  roadtrl010g.shp
#####利用road.gmt在gmt画图
gmt psxy road.gmt -J$J -R$R -W0.5p,black -K -O>>$PS

plot National Hydrography Dataset(河流）
download data from th URL
https://viewer.nationalmap.gov/basic/#productSearch
Unzip zip file, click Thumbnail to see the data.
ogr2ogr -f "OGR_GMT" NHDFlowline.gmt  NHDFlowline.shp
gmt psxy NHDFlowline.gmt -J$J -R$R -W0.5p,black -K -O>>$PS