gdal-async

# GeosOp User Guide `geosop` is a CLI (command-line interface) for GEOS. It can be used to: * Run GEOS operations on one or many geometries * Output geometry results in various formats (WKT, WKB and GeoJSON) * Time the performance of operations * Check for memory leaks in operations * Check the semantics of GEOS operations ## Features * Read list of geometries from a file (WKT or WKB) * Read geometries from stdin (WKT or WKB) * Read geometry from command-line literal (WKT or WKB) * Input format is WKT or WKB * Apply a limit and offset (TBD) to the input geometries * collect input geometries into a GeometryCollection (for aggregate operations) * Execute a GEOS operation on each geometry * TBD: Execute a GEOS operation on each geometry for a list of different arguments * Explode result collections into individual geometries * Output result as text, WKT or WKB * Time the overall and individual performance of each operation ## Usage ``` geosop [OPTION...] opName opArg -a arg source for A geometries (WKT, WKB, file, stdin, stdin.wkb) -b arg source for B geometries (WKT, WKB, file, stdin, stdin.wkb) -l, --limita arg Limit number of A geometries read -o, --offseta arg Skip reading first N geometries of A -c, --collect Collect input into single geometry (automatic for AGG ops) -e, --explode Explode results into component geometries -f, --format arg Output format (wkt, wkb, txt or geojson) -p, --precision arg Set number of decimal places in output coordinates -q, --quiet Disable result output -r, --repeat arg Repeat operation N times -t, --time Print execution time -v, --verbose Verbose output -h, --help Print help ``` ## Examples * Print usage instructions `geosop` * Print usage instructions and list of available operations `geosop --help` * Read a file of geometries in WKT and output them as WKB `geosop -a geoms.wkt -f wkb` * Compute the area of geometries in a WKT file and output them as text `geosop -a geoms.wkt area` * Compute the centroids of geometries in a WKT file and output them as WKT `geosop -a geoms.wkt centroid` * Compute an operation on a list of geometries and output only geometry metrics and timing `geosop -a geoms.wkt -v -q isValid` * Validate geometries from a WKT file, reading only 5 and skipping the first 10 `geosop -a geoms.wkt --limita 5 --offseta 10 isValid` * Compute the buffer with distance 10 of WKB geometries and output as WKT `geosop -a geoms.wkb -f wkt buffer 10` * Compute the unary union of a set of WKT geometries and output as WKB * `unaryUnion` is an aggregate operation, so automatically collects all input geometries `geosop -a geoms.wkt -f wkb unaryUnion` * Compute the buffer of a WKB literal and output as GeoJSON `geosop -a 000000000140240000000000004024000000000000 -f geojson buffer 10` * Polygonize lines and output the individual result polygons as WKT `geosop -a "MULTILINESTRING ((200 100, 100 100, 200 200), (200 200, 200 100), (200 200, 300 100, 200 100))" -v -e polygonize` * Read geometries from a WKT file on stdin and output as WKB `geosop -a - -f wkb` * Read geometries from a WKB file on stdin and output as WKT `geosop -a stdin.wkb` * Run a sequence of operations using a pipe `geosop -a "LINESTRING (10 10, 20 20)" buffer 10 | geosop -a - envelope` * Compute the union of two geometries in WKT and WKB and output as WKT `geosop -a some-geom.wkt -b some-other-geom.wkb union` * TBD: Compute the buffer of a WKT literal for multiple distances `geosop -a "MULTIPOINT ( (0 0), (10 10) )" buffer 1,2,3,4` * TBD: Compute the buffer of a WKT literal and output as WKB, with SRID set to 4326 `geosop -a "POINT (10 10)" --srid=4326 -f wkb buffer 10` ## Future Ideas * `--sort [ asc | desc ]` sorts output geometries by value of operation * `--where [eq | gt |ge | lt | le ]:val` filters result geometries by value of operation * `--limit N` applies limit to output (used with sorting) * `--srid s` sets SRID to s, for WKB output