GDAL-VECTOR-SET-GEOM-TYPE(1) GDAL GDAL-VECTOR-SET-GEOM-TYPE(1) NAME gdal-vector-set-geom-type - Modify the geometry type of a vector dataset Added in version 3.12. SYNOPSIS Usage: gdal vector set-geom-type [OPTIONS] Modify the geometry type of a vector dataset. Positional arguments: -i, --input Input vector datasets [required] [not available in pipelines] -o, --output Output vector dataset [required] [not available in pipelines] Common Options: -h, --help Display help message and exit --json-usage Display usage as JSON document and exit --config = Configuration option [may be repeated] -q, --quiet Quiet mode (no progress bar or warning message) [not available in pipelines] Options: -l, --layer, --input-layer Input layer name(s) [may be repeated] [not available in pipelines] -f, --of, --format, --output-format Output format ("GDALG" allowed) [not available in pipelines] --co, --creation-option = Creation option [may be repeated] [not available in pipelines] --lco, --layer-creation-option = Layer creation option [may be repeated] [not available in pipelines] --overwrite Whether overwriting existing output dataset is allowed [not available in pipelines] --update Whether to open existing dataset in update mode [not available in pipelines] --overwrite-layer Whether overwriting existing output layer is allowed [not available in pipelines] --append Whether appending to existing layer is allowed [not available in pipelines] Mutually exclusive with --upsert --output-layer Output layer name [not available in pipelines] --skip-errors Skip errors when writing features [not available in pipelines] --active-layer Set active layer (if not specified, all) --active-geometry Geometry field name to which to restrict the processing (if not specified, all) --layer-only Only modify the layer geometry type Mutually exclusive with --feature-only --feature-only Only modify the geometry type of features Mutually exclusive with --layer-only --geometry-type Geometry type --multi Force geometries to MULTI geometry types Mutually exclusive with --single --single Force geometries to non-MULTI geometry types Mutually exclusive with --multi --linear Convert curve geometries to linear types Mutually exclusive with --curve --curve Convert linear geometries to curve types Mutually exclusive with --linear --dim Force geometries to the specified dimension. DIM=XY|XYZ|XYM|XYZM --skip Skip feature when change of feature geometry type failed Advanced Options: --if, --input-format Input formats [may be repeated] [not available in pipelines] --oo, --open-option = Open options [may be repeated] [not available in pipelines] --output-oo, --output-open-option = Output open options [may be repeated] [not available in pipelines] --upsert Upsert features (implies 'append') [not available in pipelines] Mutually exclusive with --append DESCRIPTION gdal vector set-geom-type can be used to modify the geometry type of geometry fields at the layer and/or feature level. It can also be used as a step of gdal vector pipeline. The following groups of options can be combined together: - --multi / --single - --linear / --curve - --dim GDALG OUTPUT (ON-THE-FLY / STREAMED DATASET) This program supports serializing the command line as a JSON file using the GDALG output format. The resulting file can then be opened as a vector dataset using the GDALG: GDAL Streamed Algorithm driver, and apply the specified pipeline in a on-the-fly / streamed way. PROGRAM-SPECIFIC OPTIONS --curve Force geometries to curve geometry types. e.g. LINESTRING ==> COMPOUNDCURVE or POLYGON ==> CURVEPOLYGON. Points are kept unmodified. This option is mutually exclusive with --linear. --dim Force geometries to the specified dimension (XY, XYZ, XYM, or XYZM). If the input geometry lacks Z or M components, they will be set to 0. This option is mutually exclusive with --geometry-type. --feature-only Only modify the geometry type of features. --geometry-type Change the geometry type to be one of GEOMETRY, POINT, LINESTRING, POLYGON, MULTIPOINT, MULTILINESTRING, MULTIPOLYGON, GEOMETRYCOLLECTION, CURVE, CIRCULARSTRING, COMPOUNDCURVE, SURFACE, CURVEPOLYGON, MULTICURVE, MULTISURFACE, POLYHEDRALSURFACE or TIN. Z, M or ZM suffixes can be appended to the above values to indicate the dimensionality. This option is mutually exclusive with --multi, --single, --linear, --curve, and --dim. --layer-only Only modify the layer geometry type. A typical use case is if the layer geometry type is set to unknown and the user knows that the layer only contains geometry of a given type. --linear Force geometries to linear/non-curve geometry types, approximating arcs with linear segments. The linear approximation can be controlled with configuration options OGR_ARC_STEPSIZE and OGR_ARC_MAX_GAP (specified using vector_common_options --config). e.g. COMPOUNDCURVE ==> LINESTRING. This option is mutually exclusive with --curve. --multi Force geometries to MULTI geometry types. e.g. POINT ==> MULTIPOINT. This option is mutually exclusive with --single. --single Force geometries to non-MULTI geometry types. e.g. MULTIPOINT ==> POINT. This option is mutually exclusive with --multi. MultiPoint or MultiLinestring with more than one component will be kept unmodified. MultiPolygon with more than one component will be merged into a (likely invalid according to OGC Simple Features rule) single polygon, merging all their rings. --skip Skip feature when change of feature geometry type failed (e.g. attempting to force a Point geometry type for a LineString geometry). Otherwise the source geometry will be kept unmodified (which may make it incompatible with the output layer if it does not support mix of geometry types). This option applies both when the target geometry type is defined with --geometry-type, or with any of --multi, --single, --linear, and --curve. STANDARD OPTIONS --active-geometry Set the active geometry field from its name. When it is specified, only the specified geometry field will be subject to the processing. Other geometry fields will be not modified. If this option is not specified, all geometry fields will be subject to the processing. This option can be combined together with --active-layer. --active-layer Set the active layer. When it is specified, only the layer specified by its name will be subject to the processing. Other layers will be not modified. If this option is not specified, all layers will be subject to the processing. --append Whether appending features to existing layer(s) is allowed. This also creates the output dataset if it does not exist yet. --co, --creation-option = Many formats have one or more optional dataset creation options that can be used to control particulars about the file created. For instance, the GeoPackage driver supports creation options to control the version. May be repeated. The dataset creation options available vary by format driver, and some simple formats have no creation options at all. A list of options supported for a format can be listed with the --formats command line option but the documentation for the format is the definitive source of information on driver creation options. See Vector drivers format specific documentation for legal creation options for each format. Note that dataset creation options are different from layer creation options. --if, --input-format Format/driver name to be attempted to open the input file(s). It is generally not necessary to specify it, but it can be used to skip automatic driver detection, when it fails to select the appropriate driver. This option can be repeated several times to specify several candidate drivers. Note that it does not force those drivers to open the dataset. In particular, some drivers have requirements on file extensions. May be repeated. --input-layer Specifies the name of one or more layers to process. By default, all layers will be processed. To read and write all layers but only process a subset, use --active-layer. --lco, --layer-creation-option = Many formats have one or more optional layer creation options that can be used to control particulars about the layer created. For instance, the GeoPackage driver supports layer creation options to control the feature identifier or geometry column name, setting the identifier or description, etc. May be repeated. The layer creation options available vary by format driver, and some simple formats have no layer creation options at all. A list of options supported for a format can be listed with the --formats command line option but the documentation for the format is the definitive source of information on driver creation options. See Vector drivers format specific documentation for legal creation options for each format. Note that layer creation options are different from dataset creation options. --oo, --open-option = Dataset open option (format specific). May be repeated. -f, --of, --format, --output-format Which output vector format to use. Allowed values may be given by gdal --formats | grep vector | grep rw | sort --output-layer Specifies the name of the layer to which features will be written. If not specified, output layer names will be the same as input layer names. --output-open-option, --output-oo = Added in version 3.12. Dataset open option for output dataset (format specific). May be repeated. --overwrite Allow program to overwrite existing target file or dataset. Otherwise, by default, gdal errors out if the target file or dataset already exists. --overwrite-layer Whether overwriting the existing output vector layer is allowed. --skip-errors Added in version 3.12. Whether failures to write feature(s) should be ignored. Note that this option sets the size of the transaction unit to one feature at a time, which may cause severe slowdown when inserting into databases. --update Whether to open an existing output dataset in update mode. --upsert Added in version 3.12. Variant of --append where the OGRLayer::UpsertFeature() operation is used to insert or update features instead of appending with OGRLayer::CreateFeature(). This is currently implemented only in a few drivers: GPKG -- GeoPackage vector, Elasticsearch: Geographically Encoded Objects for Elasticsearch and MongoDBv3 (drivers that implement upsert expose the GDAL_DCAP_UPSERT capability). The upsert operation uses the FID of the input feature, when it is set (and the FID column name is not the empty string), as the key to update existing features. It is crucial to make sure that the FID in the source and target layers are consistent. For the GPKG driver, it is also possible to upsert features whose FID is unset or non-significant (the --unset-fid option of gdal vector edit can be used to ignore the FID from the source feature), when there is a UNIQUE column that is not the integer primary key. RETURN STATUS CODE The program returns status code 0 in case of success, and non-zero in case of error (non-blocking errors emitted as warnings are considered as a successful execution). EXAMPLES Example 1: Convert a shapefile mixing polygons and multipolygons to a GeoPackage with multipolygons. $ gdal vector set-geom-type --geometry-type=MULTIPOLYGON in.shp out.gpkg --overwrite Example 2: Convert a GeoPackage with curve geometries to a Shapefile (that does not support them). $ gdal vector set-geom-type --linear in.gpkg out.shp --overwrite AUTHOR Even Rouault COPYRIGHT 1998-2026 August 18, 2026 GDAL-VECTOR-SET-GEOM-TYPE(1)