Accessing raster attribute table in QGIS?

Question

I have some Python code that makes Raster Attribute Tables for GeoTiffs using GDAL.

In ArcGIS I can see these attribute tables fine and they behave how I like (as classifications) but in QGIS the whole concept of an attribute table seems to be missing.

Is there any way to access a RAT in QGIS?

There is a crowdfunding effort to implement RATs at Kartoza: https://kartoza.com/en/crowdfunding/raster-vat-table-support-in-qgis/ Make a pledge! — Stu Smith, Mar 20 '21 at 15:25

score 13 · Accepted Answer · edited Mar 20 '21 at 06:01

13

This feature request might fill your needs: https://github.com/qgis/QGIS/issues/22427

edited Mar 20 '21 at 06:01

user2856

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answered Sep 27 '12 at 10:57

Giovanni Manghi

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If I understand correctly this feature still still doesn't exist? – kalakaru Mar 17 '16 at 08:27
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Yes, not yet implemented. Evidently is not something asked by many. – Giovanni Manghi Mar 17 '16 at 16:42

score 7 · Answer 2 · answered May 18 '21 at 17:10

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Good news! A Raster Attribute Table plugin (experimental) is now available. There's also a Youtube video introduction at https://www.youtube.com/watch?v=nARp6yxRt68

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answered May 18 '21 at 17:10

Stu Smith

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Looks like it's currently missing from the plugin repo? Is there some other homepage for this? – alphabetasoup Jul 26 '21 at 04:19
https://plugins.qgis.org/plugins/RasterAttributeTable/ – snow-raven Oct 31 '21 at 22:10
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https://github.com/noaa-ocs-hydrography/qgis-raster-attribute-table-plugin – snow-raven Oct 31 '21 at 22:10

score 3 · Answer 3 · answered May 12 '20 at 18:55

There is still no such function in QGIS as raster attributive table (as it was in ArcMap). However, you can get similar output by running Raster layer unique values report. This function counts unique values (which is perfect for integer rasters) and even calculates the area.

The output will look smth like:

Extent: 103.2208100000000002,52.1505000000000010 : 141.5203300000000013,73.7999700000000018

Projection: WGS 84 (EPSG:4326)

Width in pixels: 33991 (units per pixel 0.00112675)

Height in pixels: 19214 (units per pixel 0.00112675)

Total pixel count: 653103074

NODATA pixel count: 339328216

Value   Pixel count Area (deg²)
0   1549588 1.96732049625739
1   248748550   315.8053113661866
2   17323972    21.99410759001047
3   24404810    30.98377305468765
4   3532094 4.48426350804714
5   7962170 10.10858385305366
6   10253674    13.01782346155333

Accessing raster attribute table in QGIS?

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