1gdallocationinfo(1)         General Commands Manual        gdallocationinfo(1)
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NAME

6       gdallocationinfo - raster query tool
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SYNOPSIS

9       Usage: gdallocationinfo [--help-general] [-xml] [-lifonly] [-valonly]
10                               [-b band]* [-overview overview_level]
11                               [-l_srs srs_def] [-geoloc] [-wgs84]
12                               [-oo NAME=VALUE]* srcfile [x y]
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DESCRIPTION

15       The gdallocationinfo utility provide a mechanism to query information
16       about a pixel given its location in one of a variety of coordinate
17       systems. Several reporting options are provided.
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19       -xml:
20           The output report will be XML formatted for convenient post
21           processing.
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23       -lifonly:
24           The only output is filenames production from the LocationInfo
25           request against the database (i.e. for identifying impacted file
26           from VRT).
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28       -valonly:
29           The only output is the pixel values of the selected pixel on each
30           of the selected bands.
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32       -b band:
33           Selects a band to query. Multiple bands can be listed. By default
34           all bands are queried.
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36       -overview overview_level:
37           Query the (overview_level)th overview (overview_level=1 is the 1st
38           overview), instead of the base band. Note that the x,y location (if
39           the coordinate system is pixel/line) must still be given with
40           respect to the base band.
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42       -l_srs srs def:
43           The coordinate system of the input x, y location.
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45       -geoloc:
46           Indicates input x,y points are in the georeferencing system of the
47           image.
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49       -wgs84:
50           Indicates input x,y points are WGS84 long, lat.
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52       -oo NAME=VALUE:
53           (starting with GDAL 2.0) Dataset open option (format specific)
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55       srcfile:
56           The source GDAL raster datasource name.
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58       x:  X location of target pixel. By default the coordinate system is
59           pixel/line unless -l_srs, -wgs84 or -geoloc supplied.
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61       y:  Y location of target pixel. By default the coordinate system is
62           pixel/line unless -l_srs, -wgs84 or -geoloc supplied.
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64       This utility is intended to provide a variety of information about a
65       pixel. Currently it reports three things:
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67       · The location of the pixel in pixel/line space.
68       · The result of a LocationInfo metadata query against the datasource -
69         currently this is only implemented for VRT files which will report
70         the file(s) used to satisfy requests for that pixel.
71       · The raster pixel value of that pixel for all or a subset of the
72         bands.
73       · The unscaled pixel value if a Scale and/or Offset apply to the band.
74       The pixel selected is requested by x/y coordinate on the command line,
75       or read from stdin. More than one coordinate pair can be supplied when
76       reading coordinates from stdin. By default pixel/line coordinates are
77       expected. However with use of the -geoloc, -wgs84, or -l_srs switches
78       it is possible to specify the location in other coordinate systems.
79       The default report is in a human readable text format. It is possible
80       to instead request xml output with the -xml switch.
81       For scripting purposes, the -valonly and -lifonly switches are provided
82       to restrict output to the actual pixel values, or the LocationInfo
83       files identified for the pixel.
84       It is anticipated that additional reporting capabilities will be added
85       to gdallocationinfo in the future.

EXAMPLE

87       Simple example reporting on pixel (256,256) on the file utm.tif.
88       $ gdallocationinfo utm.tif 256 256
89       Report:
90         Location: (256P,256L)
91         Band 1:
92           Value: 115
93       Query a VRT file providing the location in WGS84, and getting the
94       result in xml.
95       $ gdallocationinfo -xml -wgs84 utm.vrt -117.5 33.75
96       <Report pixel="217" line="282">
97         <BandReport band="1">
98           <LocationInfo>
99             <File>utm.tif</File>
100           </LocationInfo>
101           <Value>16</Value>
102         </BandReport>
103       </Report>

AUTHORS

105       Frank Warmerdam warmerdam@pobox.com
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109GDAL                            Mon Feb 11 2019            gdallocationinfo(1)
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