Zonal statistics - Revision history

Neteler: simplify description

2017-04-05T11:32:15Z

simplify description

← Older revision		Revision as of 11:32, 5 April 2017
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	* {{cmd\|r.univar}}: univariate and zonal raster statistics		* {{cmd\|r.univar}}: univariate and zonal raster statistics
	* {{cmd\|v.rast.stats}}: calculates univariate statistics from a raster map based on vector polygons and uploads statistics to new attribute columns		* {{cmd\|v.rast.stats}}: calculates univariate statistics from a raster map based on vector polygons and uploads statistics to new attribute columns
	* {{cmd\|v.vect.stats}}: count points in areas, calculate statistics from point attributes ~~(needs GRASS 6.4.3 or later).~~		* {{cmd\|v.vect.stats}}: count points in areas, calculate statistics from point attributes

	=== Example ===		=== Example ===

Neteler: highlight relevant modules

2017-04-05T11:31:40Z

highlight relevant modules

← Older revision		Revision as of 11:31, 5 April 2017
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	* {{cmd\|r.report}}: report generator in various units		* {{cmd\|r.report}}: report generator in various units

	* {{cmd\|r.univar}}: univariate and zonal raster statistics		* '''{{cmd\|r.univar}}: univariate and zonal raster statistics'''
	* {{cmd\|v.univar}}: univariate and zonal raster statistics		* '''{{cmd\|v.univar}}: univariate and zonal raster statistics'''

	* {{cmd\|r.neighbors}}: makes each cell category value a function of the category values assigned to the cells around it, and stores new cell values in an output raster map layer.		* {{cmd\|r.neighbors}}: makes each cell category value a function of the category values assigned to the cells around it, and stores new cell values in an output raster map layer.

Neteler at 18:05, 31 December 2013

2013-12-31T18:05:16Z

← Older revision		Revision as of 18:05, 31 December 2013
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	[[Category: FAQ]]		[[Category: FAQ]]
			[[Category: Vector]]

Neteler: v.vect.stats in core GRASS

2012-12-31T12:56:22Z

v.vect.stats in core GRASS

← Older revision		Revision as of 12:56, 31 December 2012
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	* {{cmd\|r.univar}}: univariate and zonal raster statistics		* {{cmd\|r.univar}}: univariate and zonal raster statistics
	* {{cmd\|v.rast.stats}}: calculates univariate statistics from a raster map based on vector polygons and uploads statistics to new attribute columns		* {{cmd\|v.rast.stats}}: calculates univariate statistics from a raster map based on vector polygons and uploads statistics to new attribute columns
	* {{cmd\|v.vect.stats~~\|version=70~~}}: count points in areas, calculate statistics from point attributes (needs GRASS 7).		* {{cmd\|v.vect.stats}}: count points in areas, calculate statistics from point attributes (needs GRASS 6.4.3 or later).

	=== Example ===		=== Example ===

Neteler: +example

2012-10-14T19:36:03Z

+example

← Older revision		Revision as of 19:36, 14 October 2012
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	* {{cmd\|v.rast.stats}}: calculates univariate statistics from a raster map based on vector polygons and uploads statistics to new attribute columns		* {{cmd\|v.rast.stats}}: calculates univariate statistics from a raster map based on vector polygons and uploads statistics to new attribute columns
	* {{cmd\|v.vect.stats\|version=70}}: count points in areas, calculate statistics from point attributes (needs GRASS 7).		* {{cmd\|v.vect.stats\|version=70}}: count points in areas, calculate statistics from point attributes (needs GRASS 7).

			=== Example ===

			'''Task:''' calculate average temperature per country. Available maps: SHAPE file of countries, raster map of temperature.

			'''Solution:''' First set the computational region to the vector map along with the desired raster resolution. Then convert the vector country map to raster using {{cmd\|v.to.rast}}. Then run {{cmd\|r.univar}} which offers zonal statistics using the country map on top of the temperature raster map. The command optionally outputs the result as table output format instead of standard output format.

	[[Category: FAQ]]		[[Category: FAQ]]

Neteler: +screenshot

2012-09-05T09:47:25Z

+screenshot

← Older revision		Revision as of 09:47, 5 September 2012
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	GRASS GIS offers support for zonal statistics		GRASS GIS offers support for zonal statistics

			[[Image:Zones for zonal statistics.jpg\|thumb\|300px\|Countries as zones for zonal statistics]]

	=== Single maps ===		=== Single maps ===

Neteler: new

2012-03-04T16:27:49Z

new

New page

GRASS GIS offers support for zonal statistics

=== Single maps ===
* {{cmd|r.clump}}: finds all areas of contiguous raster cell category values in the input raster map and assigns a unique category value to each such area ("clump") in the resulting output raster map. This can be used to calculate statistics based on the clumps instead of individual raster cells.

* {{cmd|r.report}}: report generator in various units

* {{cmd|r.univar}}: univariate and zonal raster statistics
* {{cmd|v.univar}}: univariate and zonal raster statistics

* {{cmd|r.neighbors}}: makes each cell category value a function of the category values assigned to the cells around it, and stores new cell values in an output raster map layer.
* {{cmd|v.neighbors}}: makes each cell value a function of the attribute values assigned to the vector points or centroids around it, and stores new cell values in an output raster map layer.

=== Multiple maps ===
* {{cmd|r.univar}}: univariate and zonal raster statistics
* {{cmd|v.rast.stats}}: calculates univariate statistics from a raster map based on vector polygons and uploads statistics to new attribute columns
* {{cmd|v.vect.stats|version=70}}: count points in areas, calculate statistics from point attributes (needs GRASS 7).

[[Category: FAQ]]