GDALLOCATIONINFO(1) GDAL GDALLOCATIONINFO(1)
NAME
gdallocationinfo - Raster query tool.
SYNOPSIS
Usage: gdallocationinfo [--help-general] [-xml] [-lifonly] [-valonly]
[-b band]* [-overview overview_level]
[-l_srs srs_def] [-geoloc] [-wgs84]
[-oo NAME=VALUE]* srcfile [x y]
DESCRIPTION
The gdallocationinfo utility provide a mechanism to query information
about a pixel given its location in one of a variety of coordinate sys-
tems. Several reporting options are provided.
-xml The output report will be XML formatted for convenient post pro-
cessing.
-lifonly
The only output is filenames production from the LocationInfo
request against the database (i.e. for identifying impacted file
from VRT).
-valonly
The only output is the pixel values of the selected pixel on
each of the selected bands.
-b <band>
Selects a band to query. Multiple bands can be listed. By de-
fault all bands are queried.
-overview <overview_level>
Query the (overview_level)th overview (overview_level=1 is the
1st overview), instead of the base band. Note that the x,y loca-
tion (if the coordinate system is pixel/line) must still be
given with respect to the base band.
-l_srs <srs_def>
The coordinate system of the input x, y location.
-geoloc
Indicates input x,y points are in the georeferencing system of
the image.
-wgs84 Indicates input x,y points are WGS84 long, lat.
-oo NAME=VALUE
Dataset open option (format specific)
<srcfile>
The source GDAL raster datasource name.
<x> X location of target pixel. By default the coordinate system is
pixel/line unless -l_srs, -wgs84 or -geoloc supplied.
<y> Y location of target pixel. By default the coordinate system is
pixel/line unless -l_srs, -wgs84 or -geoloc supplied.
This utility is intended to provide a variety of information about a
pixel. Currently it reports:
• The location of the pixel in pixel/line space.
• The result of a LocationInfo metadata query against the datasource.
This is implement for VRT files which will report the file(s) used to
satisfy requests for that pixel, and by the raster.mbtiles driver
• The raster pixel value of that pixel for all or a subset of the
bands.
• The unscaled pixel value if a Scale and/or Offset apply to the band.
The pixel selected is requested by x/y coordinate on the command line,
or read from stdin. More than one coordinate pair can be supplied when
reading coordinates from stdin. By default pixel/line coordinates are
expected. However with use of the -geoloc, -wgs84, or -l_srs switches
it is possible to specify the location in other coordinate systems.
The default report is in a human readable text format. It is possible
to instead request xml output with the -xml switch.
For scripting purposes, the -valonly and -lifonly switches are provided
to restrict output to the actual pixel values, or the LocationInfo
files identified for the pixel.
It is anticipated that additional reporting capabilities will be added
to gdallocationinfo in the future.
EXAMPLES
Simple example reporting on pixel (256,256) on the file utm.tif.
$ gdallocationinfo utm.tif 256 256
Report:
Location: (256P,256L)
Band 1:
Value: 115
Query a VRT file providing the location in WGS84, and getting the re-
sult in xml.
$ gdallocationinfo -xml -wgs84 utm.vrt -117.5 33.75
<Report pixel="217" line="282">
<BandReport band="1">
<LocationInfo>
<File>utm.tif</File>
</LocationInfo>
<Value>16</Value>
</BandReport>
</Report>
Reading location from stdin.
$ cat coordinates.txt
443020 3748359
441197 3749005
443852 3747743
$ cat coordinates.txt | gdallocationinfo -geoloc utmsmall.tif
Report:
Location: (38P,49L)
Band 1:
Value: 214
Report:
Location: (7P,38L)
Band 1:
Value: 107
Report:
Location: (52P,59L)
Band 1:
Value: 148
AUTHOR
Frank Warmerdam <warmerdam@pobox.com>
COPYRIGHT
1998-2021
Dec 27, 2021 GDALLOCATIONINFO(1)
Generated by dwww version 1.14 on Fri Jan 24 06:15:01 CET 2025.