Feature request #3338

zonal statistics

Added by flo - over 10 years ago. Updated almost 10 years ago.

Status:Closed
Priority:Normal
Assignee:Marco Hugentobler
Category:C++ Plugins
Pull Request or Patch supplied:No Resolution:
Easy fix?:No Copied to github as #:13398

Description

A zonal statistics plugin would be great. It would allow to extract raster statistics with a vector layer : mean raster value for each vector features (polygon, line or point), and also standard deviation, median...

History

#1 Updated by Giovanni Manghi over 10 years ago

meanwhile you have zonal statistics trough the GRASS plugin.

#2 Updated by flo - over 10 years ago

Replying to [comment:1 lutra]:

meanwhile you have zonal statistics trough the GRASS plugin.

Thank you for your answer, I use also Grass. However, I think it's an "usual" GIS task, and it would be more convenient if it could be directly done in Qgis, without Grass. Moreover, I think the zonal stat in Grass takes a lot of time to compute statistics (in comparison with Arcgis).

#3 Updated by Borys Jurgiel over 10 years ago

Could you please add this idea to http://www.qgis.org/wiki/Python_Plugin_Ideas ?
We set that page over a year ago, so let's start using it! :)

#4 Updated by Marco Hugentobler over 10 years ago

There is a zonal statistic function in the analysis library (analysis/vector/qgszonalstatistics.cpp/.h). I've wrote the function and a plugin because GRASS was too slow for my needs. However, also the function in the analysis lib is still far from optimal performance and follows a 'naive' approach. That's why I didn't commit the (GUI) plugin to trunk.

If you are interested in using the plugin, go to http://www.sourcepole.com/2010/12/16/zonal-statistics-plugin-for-qgis and download the source. It is explained on the page how to recompile.

Regards,
Marco

#5 Updated by Giovanni Manghi over 10 years ago

Hi Marco,
is really that bad? ;)

I would not mind to have even a sub optimal solution in QGIS and then have it upgraded when possible in the future...

#6 Updated by flo - over 10 years ago

Thank you for this function. I've tested it and it seems to work fine ! Couldn't it be by default in Qgis ?

#7 Updated by Paolo Cavallini almost 10 years ago

  • Pull Request or Patch supplied set to No

I understand it has been added to Windows build - please add it also to debs

#8 Updated by Giovanni Manghi almost 10 years ago

  • Priority changed from Low to Normal
  • Target version changed from Version 2.0.0 to Version 1.7.1

#9 Updated by Jürgen Fischer almost 10 years ago

  • Status changed from Open to Closed

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