.\" Man page generated from reStructuredText. . . .nr rst2man-indent-level 0 . .de1 rstReportMargin \\$1 \\n[an-margin] level \\n[rst2man-indent-level] level margin: \\n[rst2man-indent\\n[rst2man-indent-level]] - \\n[rst2man-indent0] \\n[rst2man-indent1] \\n[rst2man-indent2] .. .de1 INDENT .\" .rstReportMargin pre: . RS \\$1 . nr rst2man-indent\\n[rst2man-indent-level] \\n[an-margin] . nr rst2man-indent-level +1 .\" .rstReportMargin post: .. .de UNINDENT . RE .\" indent \\n[an-margin] .\" old: \\n[rst2man-indent\\n[rst2man-indent-level]] .nr rst2man-indent-level -1 .\" new: \\n[rst2man-indent\\n[rst2man-indent-level]] .in \\n[rst2man-indent\\n[rst2man-indent-level]]u .. .TH "GDAL-RASTER-CONTOUR" "1" "Aug 18, 2026" "" "GDAL" .SH NAME gdal-raster-contour \- Creates a vector contour from a raster elevation model (DEM) .sp Added in version 3.11. .SH SYNOPSIS .INDENT 0.0 .INDENT 3.5 .sp .EX Usage: gdal raster contour [OPTIONS] Creates a vector contour from a raster elevation model (DEM). Positional arguments: \-i, \-\-input Input raster 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: \-f, \-\-of, \-\-format, \-\-output\-format Output format (\(dqGDALG\(dq 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] \-\-output\-layer Output layer name \-b, \-\-band Input band (1\-based index) (default: 1) \-\-elevation\-name Name of the elevation field \-\-min\-name Name of the minimum elevation field \-\-max\-name Name of the maximum elevation field \-\-3d Force production of 3D vectors instead of 2D \-\-input\-nodata Input pixel value to treat as \(aqnodata\(aq \-\-interval Elevation interval between contours Mutually exclusive with \-\-levels, \-\-exp\-base \-\-levels List of contour levels [may be repeated] Mutually exclusive with \-\-interval, \-\-exp\-base \-e, \-\-exp\-base Base for exponential contour level generation Mutually exclusive with \-\-interval, \-\-levels \-\-off, \-\-offset Offset to apply to contour levels \-p, \-\-polygonize Create polygons instead of lines \-\-group\-transactions Group n features per transaction (default 100 000) 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] .EE .UNINDENT .UNINDENT .SH DESCRIPTION .sp \fBgdal raster contour\fP creates a vector contour from a raster elevation model (DEM). .sp Since GDAL 3.12, this algorithm can be part of a \fI\%gdal pipeline\fP\&. .sp Added in version 3.12. .SH GDALG OUTPUT (ON-THE-FLY / STREAMED DATASET) .sp This program supports serializing the command line as a JSON file using the \fBGDALG\fP output format. The resulting file can then be opened as a vector dataset using the \fI\%GDALG: GDAL Streamed Algorithm\fP driver, and apply the specified pipeline in a on\-the\-fly / streamed way. .sp \fBNOTE:\fP .INDENT 0.0 .INDENT 3.5 However this algorithm is not natively streaming compatible. Consequently a in\-memory temporary dataset will be generated, which may cause significant processing time at opening. .UNINDENT .UNINDENT .SH PROGRAM-SPECIFIC OPTIONS .INDENT 0.0 .TP .B \-\-3d Forces the production of 3D vectors instead of 2D. Includes elevation at every vertex. .UNINDENT .INDENT 0.0 .TP .B \-b, \-\-band Picks a particular band to get the DEM from. Defaults to band 1. .UNINDENT .INDENT 0.0 .TP .B \-\-elevation\-name Provides a name for the attribute in which to put the elevation. If not provided no elevation attribute is attached. Ignored in polygonal contouring (\-p) mode. .UNINDENT .INDENT 0.0 .TP .B \-e, \-\-exp\-base Generate levels on an exponential scale: base ^ k, for k an integer. Mutually exclusive with \fI\%\-\-interval\fP, \fI\%\-\-levels\fP\&. .UNINDENT .INDENT 0.0 .TP .B \-\-group\-transactions Group n features per transaction (default 100 000). .UNINDENT .INDENT 0.0 .TP .B \-\-interval Elevation interval between contours. Mutually exclusive with \fI\%\-\-levels\fP, \fI\%\-\-exp\-base\fP\&. The first contour will be generated at the first multiple of \fBINTERVAL\fP which is greater than the raster minimum value. .UNINDENT .INDENT 0.0 .TP .B \-\-levels List of contour levels. \fIMIN\fP and \fIMAX\fP are special values that represent the minimum and maximum values in the raster. When \fI\-\-polygonize\fP is used, the specified values are used as bounds of the generated polygons. Mutually exclusive with \fI\%\-\-interval\fP, \fI\%\-\-exp\-base\fP\&. .UNINDENT .INDENT 0.0 .TP .B \-\-max\-name Provides a name for the attribute in which to put the maximum elevation. If not provided no maximum elevation attribute is attached. Ignored in polygonal contouring (\-p) mode. .UNINDENT .INDENT 0.0 .TP .B \-\-min\-name Provides a name for the attribute in which to put the minimum elevation. If not provided no minimum elevation attribute is attached. Ignored in polygonal contouring (\-p) mode. .UNINDENT .INDENT 0.0 .TP .B \-\-off, \-\-offset Offset from zero relative to which to interpret intervals. .UNINDENT .INDENT 0.0 .TP .B \-\-nln, \-\-output\-layer Provides a name for the output vector layer. Defaults to \(dqcontour\(dq. .UNINDENT .INDENT 0.0 .TP .B \-p, \-\-polygonize Create polygons instead of lines. .UNINDENT .INDENT 0.0 .TP .B \-\-input\-nodata Input pixel value to treat as \(aqnodata\(aq. .UNINDENT .SH STANDARD OPTIONS .INDENT 0.0 .TP .B \-\-co, \-\-creation\-option = Many formats have one or more optional creation options that can be used to control particulars about the file created. For instance, the GeoTIFF driver supports creation options to control compression, and whether the file should be tiled. .sp May be repeated. .sp The 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 \fI\%\-\-formats\fP command line option but the documentation for the format is the definitive source of information on driver creation options. See \fI\%Raster drivers\fP format specific documentation for legal creation options for each format. .UNINDENT .INDENT 0.0 .TP .B \-\-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. .sp May be repeated. .UNINDENT .INDENT 0.0 .TP .B \-\-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. .sp May be repeated. .sp 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 \fI\%\-\-formats\fP command line option but the documentation for the format is the definitive source of information on driver creation options. See \fI\%Vector drivers\fP format specific documentation for legal creation options for each format. .sp Note that layer creation options are different from dataset creation options. .UNINDENT .INDENT 0.0 .TP .B \-\-oo, \-\-open\-option = Dataset open option (format specific). .sp May be repeated. .UNINDENT .INDENT 0.0 .TP .B \-\-output\-open\-option, \-\-output\-oo = Added in version 3.12. .sp Dataset open option for output dataset (format specific). .sp May be repeated. .UNINDENT .INDENT 0.0 .TP .B \-f, \-\-of, \-\-format, \-\-output\-format Which output vector format to use. Allowed values may be given by \fBgdal \-\-formats | grep vector | grep rw | sort\fP .UNINDENT .INDENT 0.0 .TP .B \-\-overwrite Allow program to overwrite existing target file or dataset. Otherwise, by default, \fBgdal\fP errors out if the target file or dataset already exists. .UNINDENT .SH RETURN STATUS CODE .sp 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). .SH EXAMPLES .SS Example 1: Create contour lines from a raster elevation model .INDENT 0.0 .INDENT 3.5 The following example creates contour lines from a raster elevation model: .INDENT 0.0 .INDENT 3.5 .sp .EX gdal raster contour \-\-interval 100 elevation.tif contour.shp .EE .UNINDENT .UNINDENT .sp This will create a shapefile named \fBcontour.shp\fP with contour lines at 100 meter intervals. .UNINDENT .UNINDENT .SS Example 2: Create contour polygons from a raster elevation model with custom attributes and fixed levels .INDENT 0.0 .INDENT 3.5 The following example creates contour polygons from a raster elevation model with custom attributes and fixed levels: .INDENT 0.0 .INDENT 3.5 .sp .EX gdal raster contour \-\-levels MIN,100,200,MAX \-\-polygonize \-\-min\-name MIN \-\-max\-name MAX elevation.tif contour.shp .EE .UNINDENT .UNINDENT .sp This will create a shapefile named \fBcontour.shp\fP with contour polygons from the minimum raster value to 100, and from 100 to 200 and from 200 to the maximum value, and with attributes \fBMIN\fP, and \fBMAX\fP\&. .UNINDENT .UNINDENT .SH AUTHOR Alessandro Pasotti .SH COPYRIGHT 1998-2026 .\" Generated by docutils manpage writer. .