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GDAL_FOOTPRINT(1) GDAL GDAL_FOOTPRINT(1) NAME gdal_footprint - Compute footprint of a raster. SYNOPSIS gdal_footprint [--help] [--help-general] [-b <band>]... [-combine_bands union|intersection] [-oo <NAME>=<VALUE>]... [-ovr <index>] [-srcnodata "<value>[ <value>]..."] [-t_cs pixel|georef] [-t_srs <srs_def>] [-split_polys] [-convex_hull] [-densify <value>] [-simplify <value>] [-min_ring_area <value>] [-max_points <value>|unlimited] [-of <ogr_format>] [-lyr_name <dst_layername>] [-location_field_name <field_name>] [-no_location] [-write_absolute_path] [-dsco <name>=<value>]... [-lco <name>=<value>]... [-overwrite] [-q] <src_filename> <dst_filename> DESCRIPTION The gdal_footprint utility can be used to compute the footprint of a raster file, taking into account nodata values (or more generally the mask band attached to the raster bands), and generating polygons/multi- polygons corresponding to areas where pixels are valid, and write to an output vector file. The nearblack utility may be run as a pre-processing step to generate proper mask bands. --help Show this help message and exit --help-general Gives a brief usage message for the generic GDAL commandline op- tions and exit. -b <band> Band(s) of interest. Between 1 and the number of bands of the raster. May be specified multiple times. If not specified, all bands are taken into account. The way multiple bands are com- bined is controlled by -combine_bands -combine_bands union|intersection Defines how the mask bands of the selected bands are combined to generate a single mask band, before being vectorized. The de- fault value is union: that is a pixel is valid if it is valid at least for one of the selected bands. intersection means that a pixel is valid only ifit is valid for all selected bands. -ovr <index> To specify which overview level of source file must be used, when overviews are available on the source raster. By default the full resolution level is used. The index is 0-based, that is 0 means the first overview level. This option is mutually ex- clusive with -srcnodata. -srcnodata "<value>[ <value>]..." Set nodata values for input bands (different values can be sup- plied for each band). If a single value is specified, it ap- plies to all selected bands. If more than one value is sup- plied, there should be as many values as the number of selected bands, and all values should be quoted to keep them together as a single operating system argument. If the option is not speci- fied, the intrinsic mask band of each selected bands will be used. -t_cs pixel|georef Target coordinate system. By default if the input dataset is georeferenced, georef is implied, that is the footprint geometry will be expressed as coordinates in the CRS of the raster (or the one specified with -t_srs). If specifying pixel, the coor- dinates of the footprint geometry are column and line indices. -t_srs <srs_def> Target CRS of the output file. The <srs_def> may be any of the usual GDAL/OGR forms, complete WKT, PROJ.4, EPSG:n or a file containing the WKT. Specifying this option implies -t_cs georef The footprint is reprojected from the CRS of the source raster to the specified CRS. -split_polys When specified, multipolygons are split as several features each with one single polygon. -convex_hull When specified, the convex hull of (multi)polygons is computed. -densify <value> The specified value of this option is the maximum distance be- tween 2 consecutive points of the output geometry. The unit of the distance is in pixels if -t_cs equals pixel, or otherwise in georeferenced units of the source raster. This option is ap- plied before the reprojection implied by -t_srs. -simplify <value> The specified value of this option is the tolerance used to merge consecutive points of the output geometry using the OGRGeometry::Simplify() method. The unit of the distance is in pixels if -t_cs equals pixel, or otherwise in georeferenced units of the target vector dataset. This option is applied af- ter the reprojection implied by -t_srs. -min_ring_area <value> Minimum value for the area of a ring The unit of the area is in square pixels if -t_cs equals pixel, or otherwise in georefer- enced units of the target vector dataset. This option is ap- plied after the reprojection implied by -t_srs -max_points <value>|unlimited Maximum number of points of each output geometry (not counting the closing point of each ring, which is always identical to the first point). The default value is 100. unlimited can be used to remove that limitation. -q Suppress progress monitor and other non-error output. -oo <NAME>=<VALUE> Dataset open option (format specific) -of <ogr_format> Select the output format. Use the short format name. Guessed from the file extension if not specified -location_field_name <field_name> New in version 3.9.0. Specifies the name of the field in the resulting vector dataset where the path of the input dataset will be stored. The default field name is "location". To prevent writing the path of the in- put dataset, use -no_location -no_location New in version 3.9.0. Turns off the writing of the path of the input dataset as a field in the output vector dataset. -write_absolute_path New in version 3.9.0. Enables writing the absolute path of the input dataset. By de- fault, the filename is written in the location field exactly as specified on the command line. -lco <NAME>=<VALUE> Layer creation option (format specific) -dsco <NAME>=<VALUE> Dataset creation option (format specific) -lyr_name <value> Name of the target layer. footprint if not specified. -overwrite Overwrite the target layer if it exists. <src_filename> The source raster file name. <dst_filename> The destination vector file name. If the file and the output layer exist, the new footprint is appended to them, unless -overwrite is used. Post-vectorization geometric operations are applied in the following order: • optional splitting (-split_polys) • optional densification (-densify) • optional reprojection (-t_srs) • optional filtering by minimum ring area (-min_ring_area) • optional application of convex hull (-convex_hull) • optional simplification (-simplify) • limitation of number of points (-max_points) C API This utility is also callable from C with GDALFootprint(). EXAMPLES • Compute the footprint of a GeoTIFF file as a GeoJSON file using WGS 84 longitude, latitude coordinates gdal_footprint -t_srs EPSG:4326 input.tif output.geojson AUTHOR Even Rouault <even.rouault@spatialys.com> COPYRIGHT 1998-2025 Feb 11, 2025 GDAL_FOOTPRINT(1)
NAME | SYNOPSIS | DESCRIPTION | C API | EXAMPLES | AUTHOR | COPYRIGHT
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