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OGRMERGE(1) GDAL OGRMERGE(1) NAME ogrmerge - Merge several vector datasets into a single one. SYNOPSIS ogrmerge [--help] [--help-general] -o <out_dsname> <src_dsname> [<src_dsname>]... [-f format] [-single] [-nln <layer_name_template>] [-update | -overwrite_ds] [-append | -overwrite_layer] [-src_geom_type <geom_type_name>[,<geom_type_name>]...] [-dsco <NAME>=<VALUE>]... [-lco <NAME>=<VALUE>]... [-s_srs <srs_def>] [-t_srs <srs_def> | -a_srs <srs_def>] [-progress] [-skipfailures] [--help-general] Options specific to the -single option: [-field_strategy FirstLayer|Union|Intersection] [-src_layer_field_name <name>] [-src_layer_field_content <layer_name_template>] DESCRIPTION Added in version 2.2. ogrmerge takes as input several vector datasets, each of them having one or several vector layers, and copies them into a target dataset. There are essentially two modes: * the default one, where each input vector layer, is copied as a separate layer into the target dataset * another one, activated with the -single switch, where the content of all input vector layers is appended into a single target layer. This assumes that the schema of those vector layers is more or less the same. Internally this generates a VRT -- Virtual Format file, and if the output format is not VRT, final translation is done with ogr2ogr or gdal.Vector- Translate(). So, for advanced uses, output to VRT, potential manual editing of it and ogr2ogr can be done. NOTE: ogrmerge is a Python utility, and is only available if GDAL Python bind- ings are available. --help Show this help message and exit --help-general Gives a brief usage message for the generic GDAL commandline options and exit. -o <out_dsname> Output dataset name. Required. <src_dsname> One or several input vector datasets. Required -f <format> Select the output format. Starting with GDAL 2.3, if not specified, the format is guessed from the extension (previously was ESRI Shape- file). Use the short format name -single If specified, all input vector layers will be merged into a single one. -nln <layer_name_template> Name of the output vector layer (in single mode, and the default is "merged"), or template to name the output vector layers in default mode (the default value is {AUTO_NAME}). The template can be a string with the following variables that will be substituted with a value computed from the input layer being processed: * {AUTO_NAME}: equivalent to {DS_BASENAME}_{LAYER_NAME} if both val- ues are different, or {LAYER_NAME} when they are identical (case of shapefile). * {DS_NAME}: name of the source dataset * {DS_BASENAME}: base name of the source dataset * {DS_INDEX}: index of the source dataset * {LAYER_NAME}: name of the source layer * {LAYER_INDEX}: index of the source layer -update Open an existing dataset in update mode. -overwrite_ds Overwrite the existing dataset if it already exists (for file based datasets) -append Open an existing dataset in update mode, and if output layers al- ready exist, append the content of input layers to them. -overwrite_layer Open an existing dataset in update mode, and if output layers al- ready exist, replace their content with the one of the input layer. -src_geom_type <geom_type_name>[,<geom_type_name>]... Only take into account input layers whose geometry type match the type(s) specified. Valid values for geom_type_name are GEOMETRY, POINT, LINESTRING, POLYGON, MULTIPOINT, MULTILINESTRING, MULTIPOLY- GON, GEOMETRYCOLLECTION, CIRCULARSTRING, CURVEPOLYGON, MULTICURVE, MULTISURFACE, CURVE, SURFACE, TRIANGLE, POLYHEDRALSURFACE and TIN. -dsco <NAME>=<VALUE> Dataset creation option (format specific) -lco <NAME>=<VALUE> Layer creation option (format specific) -a_srs <srs_def> Assign an output SRS -t_srs <srs_def> Reproject/transform to this SRS on output -s_srs <srs_def> Override source SRS -progress Display progress on terminal. Only works if input layers have the "fast feature count" capability. -skipfailures Continue after a failure, skipping the failed feature. -field_strategy FirstLayer|Union|Intersection Only used with -single. Determines how the schema of the target layer is built from the schemas of the input layers. May be First- Layer to use the fields from the first layer found, Union to use a super-set of all the fields from all source layers, or Intersection to use a sub-set of all the common fields from all source layers. Defaults to Union. -src_layer_field_name <name> Only used with -single. If specified, the schema of the target layer will be extended with a new field 'name', whose content is deter- mined by -src_layer_field_content. See Example 3. -src_layer_field_content <layer_name_template> Only used with -single. If specified, the schema of the target layer will be extended with a new field (whose name is given by -src_layer_field_name, or 'source_ds_lyr' otherwise), whose content is determined by layer_name_template. The syntax of layer_name_tem- plate is the same as for -nln. EXAMPLES Example 1: Creating a VRT with a layer for each input shapefile ogrmerge -f VRT -o merged.vrt *.shp Example 2: Creating a GeoPackage with a layer for each input shapefile ogrmerge -f GPKG -o merged.gpkg *.shp Example 3: Adding a field to indicate the source layer Concatenate the content of france.shp and germany.shp in merged.shp, and add a 'country' field to each feature whose value is 'france' or 'germany' depending where it comes from: ogrmerge -single -o merged.shp france.shp germany.shp -src_layer_field_name country AUTHOR Even Rouault <even.rouault@spatialys.com> COPYRIGHT 1998-2025 Oct 29, 2025 OGRMERGE(1)
NAME | SYNOPSIS | DESCRIPTION | EXAMPLES | AUTHOR | COPYRIGHT
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