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Slope maps with GMT
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| #!/usr/bin/env sh | |
| set -ex | |
| mkdir dem | |
| cd dem | |
| wget https://prd-tnm.s3.amazonaws.com/StagedProducts/Elevation/13/GridFloat/USGS_NED_13_n40w106_GridFloat.zip | |
| wget https://prd-tnm.s3.amazonaws.com/StagedProducts/Elevation/13/GridFloat/USGS_NED_13_n41w106_GridFloat.zip | |
| unzip USGS_NED_13_n40w106_GridFloat.zip | |
| unzip -n USGS_NED_13_n41w106_GridFloat.zip | |
| cd .. | |
| mkdir water | |
| cd water | |
| wget https://prd-tnm.s3.amazonaws.com/StagedProducts/Hydrography/NHD/HU8/HighResolution/Shape/NHD_H_10190005_Shape.zip | |
| unzip NHD_H_10190005_Shape.zip | |
| cd .. | |
| mkdir roads | |
| cd roads | |
| wget https://prd-tnm.s3.amazonaws.com/StagedProducts/Tran/Shape/TRAN_8_Colorado_GU_STATEORTERRITORY.zip | |
| unzip TRAN_8_Colorado_GU_STATEORTERRITORY.zip | |
| cd .. |
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| XMIN:=-105.70 | |
| XMAX:=-105.62 | |
| YMIN:=40.37 | |
| YMAX:=40.41 | |
| OGR2GMT:=ogr2ogr -f GMT -spat $(XMIN) $(YMIN) $(XMAX) $(YMAX) -clipsrc spat_extent | |
| default: build/hidden-valley.png | |
| .PHONY: default | |
| clean: | |
| rm -rf build | |
| .PHONY: clean | |
| build: | |
| mkdir $@ | |
| build/dem.vrt: Makefile | build | |
| gdalbuildvrt -te $(XMIN) $(YMIN) $(XMAX) $(YMAX) $@ $(wildcard dem/*.flt) | |
| build/dem.tif: build/dem.vrt | |
| gdal_translate $< $@ | |
| build/slope.nc: build/dem.tif | |
| grdgradient -fg $< -S$@ -D | |
| grdmath $@ ATAN PI DIV 180 MUL = $@ | |
| build/gradient.nc: build/dem.tif | |
| grdgradient -fg $< -G$@ -A-45 -Nt0.6 | |
| build/flowline.gmt: water/Shape/NHDFlowline.shp | |
| $(OGR2GMT) $@ $< | |
| build/waterbody.gmt: water/Shape/NHDWaterbody.shp | |
| $(OGR2GMT) $@ $< | |
| build/roads.shp: $(wildcard roads/Shape/Trans_RoadSegment*.shp) | |
| ogr2ogr -f 'ESRI Shapefile' -spat $(XMIN) $(YMIN) $(XMAX) $(YMAX) -clipsrc spat_extent $@ $(word 1,$^) | |
| ogr2ogr -f 'ESRI Shapefile' -spat $(XMIN) $(YMIN) $(XMAX) $(YMAX) -clipsrc spat_extent -addfields $@ $(word 2,$^) | |
| ogr2ogr -f 'ESRI Shapefile' -spat $(XMIN) $(YMIN) $(XMAX) $(YMAX) -clipsrc spat_extent -addfields $@ $(word 3,$^) | |
| build/roads.gmt: build/roads.shp | |
| ogr2ogr -f GMT $@ $< | |
| build/slope.cpt: Makefile | |
| makecpt -Cwhite,'#ffff33','#ff7f00','#e41a1c','#984ea3','#377eb8','#777777' -T0,25,30,35,40,45,50,90 -N > $@ | |
| build/hidden-valley.ps: build/dem.tif build/slope.nc build/gradient.nc build/flowline.gmt build/waterbody.gmt build/roads.gmt build/slope.cpt Makefile | |
| grdimage build/slope.nc -Cbuild/slope.cpt -Ibuild/gradient.nc -Ba -B+t"Hidden Valley" -JM8i -Rbuild/slope.nc -K > $@ | |
| grdcontour build/dem.tif -C20 -A100 -J -R -K -O >> $@ | |
| psxy build/flowline.gmt -W0.6p,'#377eb8' -J -R -K -O >> $@ | |
| psxy build/waterbody.gmt -G'#377eb8' -J -R -K -O >> $@ | |
| psxy build/roads.gmt -W1p,'#f781bf' -J -R -K -O >> $@ | |
| psbasemap -Lx5.2i/-0.7i+c$(YMIN)+w1k -J -R -K -O >> $@ | |
| psscale -D0i/-0.7i+w3i/0.2i+h -Cbuild/slope.cpt -G0/60 -By+l"Slope angle" -I -O >> $@ | |
| %.png: %.ps | |
| psconvert -TG -A -P $< |
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Hi this is very interesting, but when I tried to reproduce the map, in build/dem.vrt, the gdalbuildvrt process completes without error but I got an empty dem.vrt. I wonder whether this is an issue related to different versions of gdal.