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Skillsgdal

gdal

General & other

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Updated 10-15 22:38

About this skill

GDAL Skill

Use GDAL command line tools for common raster and vector geospatial workflows.

Tools

Prefer the smallest tool that fits the task:

  • gdalinfo
  • ogrinfo
  • gdalwarp
  • gdal_translate
  • gdalbuildvrt
  • gdaladdo
  • gdaltindex
  • gdal_rasterize
  • gdal2tiles.py
  • ogr2ogr

If GDAL is not installed, ask the user to install it before continuing.

Workflow

1. Inspect first

gdalinfo INPUT.tif
ogrinfo INPUT.shp -so -al

One full gdalinfo dump on unknown data is worth it; after that, grep for the lines you need (Size is|Origin|Pixel Size|Band|Overviews|ID\[) — full WKT dumps are large. For vectors, -so -al prints the layer summary; bare -so without -al or a layer name prints nothing useful.

2. Pick raster vs vector path

  • Raster tasks: gdalwarp, gdal_translate, gdalbuildvrt, gdal_rasterize, gdal2tiles.py
  • Vector tasks: ogr2ogr, ogrinfo, gdaltindex

3. Write a new output

  • prefer new output files
  • preserve CRS and nodata intentionally
  • use compression for large rasters

4. Validate output

Use the check that matches the operation — improvising verification is where runs go wrong:

# Any lossless conversion or mosaic: band checksums must match the input
gdalinfo -checksum INPUT.tif | grep Checksum
gdalinfo -checksum OUTPUT.tif | grep Checksum

# COG: quick layout check, then real validation
gdalinfo OUTPUT.tif | grep -E "LAYOUT|Block=|Overviews"
rio cogeo validate OUTPUT.tif   # via `uv run --with rio-cogeo` if not installed

# Warp/clip: CRS, resolution, per-band min/max in one call
gdalinfo -mm OUTPUT.tif

# Mosaic seamlessness: each quadrant bit-identical to its source tile
# (explicit offsets per tile — avoid shell arrays, the login shell may be zsh)
gdal_translate -q -of VRT -srcwin 0 0 256 256 MOSAIC.tif /tmp/quad.vrt
gdalinfo -checksum /tmp/quad.vrt | grep Checksum   # compare vs TILE_0.tif

# Vector: layer summary + SQLite-dialect counts
ogrinfo OUTPUT.gpkg LAYER -so
ogrinfo OUTPUT.gpkg -dialect SQLite -sql "SELECT COUNT(*) FROM layer"

gdaladdo on a writable GeoTIFF builds internal overviews; -ro forces an external .ovr sidecar — so the absence of a .ovr file next to the output proves the overviews are internal.

Quick Reference

# Inspect
gdalinfo INPUT.tif
ogrinfo INPUT.shp -so

# Vector conversion and clipping
ogr2ogr -f GeoJSON -t_srs epsg:4326 OUTPUT.geojson INPUT.shp
gdaltindex -t_srs epsg:4326 -f GeoJSON OUTPUT_EXTENT.geojson INPUT_RASTER.tif
ogr2ogr -f GeoJSON -clipsrc OUTPUT_EXTENT.geojson OUTPUT_CLIPPED.geojson INPUT.shp

# Raster reprojection (choose -r intentionally: bilinear/cubic for continuous, near for categorical)
gdalwarp -t_srs EPSG:XXXX -tr XRES YRES -r bilinear -co TILED=YES -co COMPRESS=DEFLATE -co PREDICTOR=2 INPUT.tif OUTPUT.tif

# Raster clipping
gdal_translate -srcwin XOFF YOFF XSIZE YSIZE INPUT.tif OUTPUT.tif   # by pixel window (exact, no resampling)
gdal_translate -projwin ULX ULY LRX LRY INPUT.tif OUTPUT.tif        # by georeferenced bounds
gdalwarp -cutline INPUT.shp -crop_to_cutline -dstalpha INPUT.tif OUTPUT.tif   # by polygon

# Raster conversion
gdal_translate -b 1 -b 2 -b 3 INPUT.tif OUTPUT.tif
gdal_translate -b 1 -b 2 -b 3 -of JPEG -outsize 400 0 INPUT.tif OUTPUT.jpg

# Mosaic and stack
gdalbuildvrt OUTPUT.vrt path/to/tiffs/*.tif
gdal_translate -co TILED=YES -co BIGTIFF=YES -co NUM_THREADS=ALL_CPUS -co COMPRESS=LZW -co PREDICTOR=2 OUTPUT.vrt OUTPUT.tif

# Internal overviews on an existing GeoTIFF (-r near for categorical; -ro writes external .ovr instead)
gdaladdo -r average OUTPUT.tif 2 4 8

# Rasterize and tile
gdal_rasterize -burn 1.0 -ot Byte -of GTiff -co COMPRESS=LZW -co BIGTIFF=YES INPUT.shp OUTPUT.tif
gdal2tiles.py -z 10-16 INPUT_BYTE.tif OUTPUT/

# COG (format-only conversion — smallest tool that fits)
gdal_translate -of COG -co COMPRESS=LZW -co PREDICTOR=2 -co NUM_THREADS=ALL_CPUS INPUT.tif OUTPUT.tif
# use gdalwarp -of COG only when also reprojecting in the same step

# Vector SQL: OGR's default dialect has no GROUP BY, window, or spatial functions —
# pass -dialect SQLite for anything beyond simple SELECT/WHERE
ogr2ogr -f GPKG OUT.gpkg IN.shp -dialect SQLite \
  -sql "SELECT *, ST_Area(ST_Transform(geometry, EPSG)) AS area_m2 FROM layer WHERE landuse IN ('ag')" \
  -t_srs EPSG:XXXX -nln layername

References

  • references/gdal-recipes.md (the only reference file)