1v.what.rast3(1) GRASS GIS User's Manual v.what.rast3(1)
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6 v.what.rast3 - Uploads 3D raster values at positions of vector points
7 to the table.
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10 vector, sampling, raster, position, querying, attribute table, surface
11 information
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14 v.what.rast3
15 v.what.rast3 --help
16 v.what.rast3 map=name [layer=string] raster_3d=name column=name
17 [where=sql_query] [--help] [--verbose] [--quiet] [--ui]
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19 Flags:
20 --help
21 Print usage summary
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23 --verbose
24 Verbose module output
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26 --quiet
27 Quiet module output
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29 --ui
30 Force launching GUI dialog
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32 Parameters:
33 map=name [required]
34 Name of vector points map for which to edit attributes
35 Or data source for direct OGR access
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37 layer=string
38 Layer number or name
39 Vector features can have category values in different layers. This
40 number determines which layer to use. When used with direct OGR ac‐
41 cess this is the layer name.
42 Default: 1
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44 raster_3d=name [required]
45 Name of existing 3D raster map to be queried
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47 column=name [required]
48 Name of attribute column to be updated with the query result
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50 where=sql_query
51 WHERE conditions of SQL statement without ’where’ keyword
52 Example: income < 1000 and population >= 10000
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55 v.what.rast3 reads 3D raster value for each point in the vector and up‐
56 dates col column in vector attribute table by this value. The column
57 should be type double. This module is based on v.what.rast.
58 If more points have the same category, attribute value is set to NULL.
59 If 3D raster values is NULL, attribute value is set to NULL.
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63 A) Reading values from 3D raster map at position of vector points,
64 writing these values into a column of the attribute table connected to
65 the vector map:
66 v.what.rast3 map=pnts raster3d=plume column=concentration
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68 B) In case of a vector map without attached attribute table, first add
69 a new attribute table. This table is then populated with values queried
70 from the raster map:
71 # create new random 3d vector points map
72 v.random -z output=pnts npoints=100 zmin=0 zmax=50
73 # add new table, link to map
74 v.db.addtable map=pnts column="concentration double precision"
75 # query raster map and upload values to vector table into specified column
76 g.region raster3d=plume -p
77 v.what.rast3 map=pnts raster3d=plume column=concentration
78 # verify new attribute table:
79 v.db.select map=pnts
80 # verify statistics of uploaded values:
81 v.univar map=pnts column=concentration type=point
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84 v.db.addtable, v.db.select, v.what.rast, v.what.vect, v.univar
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87 Soeren Gebbert, heavily based on v.what.rast by Radim Blazek
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90 Available at: v.what.rast3 source code (history)
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92 Accessed: Saturday Oct 28 18:18:51 2023
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94 Main index | Vector index | Topics index | Keywords index | Graphical
95 index | Full index
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97 © 2003-2023 GRASS Development Team, GRASS GIS 8.3.1 Reference Manual
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101GRASS 8.3.1 v.what.rast3(1)