Command to generate Cesium terrain tiles with ctb-tile #cesium #tile #makefile

Makefile

# Check command ctb-tile at 
# https://github.com/geo-data/cesium-terrain-builder
# https://github.com/tum-gis/cesium-terrain-builder-docker
,
.ONESHELL:

ZIP_URL = http://dtm.moi.gov.tw/不分幅_全台及澎湖.zip
DOCKER_IMAGE = "tumgis/ctb-quantized-mesh:latest"

data.zip:
	<<<"$(ZIP_URL)" perl -lpe 's/([^A-Za-z0-9.\/:])/sprintf("%%%02X", ord($$1))/seg' |\
	xargs curl -Lo $@

dem_20m.tif: data.zip
	unzip -p $< $@ >$@

dem_20m_EPSG4326.tif: dem_20m.tif
	gdalwarp \
		-t_srs EPSG:4326 \
		-dstnodata None  \
		-co	TILED=YES \
		-co COMPRESS=DEFLATE \
		-co BIGTIFF=IF_NEEDED \
		$< $@

tiles/: dem_20m_EPSG4326.tif
	docker image inspect $(DOCKER_IMAGE) >/dev/null || docker pull $(DOCKER_IAMGE)
	mkdir -p $@
	docker run --rm -it \
		--name ctb \
		-v `pwd`:"/data" \
		$(DOCKER_IMAGE) \
		ctb-tile -f Mesh -CN --output-dir /data/$@ /data/$<
	docker run --rm -it \
		--name ctb \
		-v `pwd`:"/data" \
		$(DOCKER_IMAGE) \
		ctb-tile -f Mesh -CN -l --output-dir /data/$@ /data/$<