[Qgis-user] Zonal Statistics Computation

Leo Kris Palao lk.palao at gmail.com
Thu Mar 12 03:06:21 PDT 2015


Hi QGIS Users,

I would like to ask if anybody have experienced getting different results
using *A)* Zonal Statistics Plugin and *B)* Zonal Statistics in Graphical
Modeler?

Here is the description of our *Dataset*:

*Vector*
5 features (2 features have area of 1.74 and 1.89 ha; 3 features have less
than 1 ha. area). These are farmer plots.

*Raster*
pixel size is 180m X 180m = 3.24ha.

*Processing*

Running Zonal Statistics in Graphical Modeler:
Only computes realistic statistics for 2 features (area having 1.74 and
1.89 ha) but gives weird computation for features having less than 1 ha.
For features less than 1 ha, it gives values 0.0000 and 1.0000

Running Zonal Statistics in Raster > Zonal Statistics > Zonal Statistics:
It gives realistic values for all features.

This happens in QGIS "Brighton" and "Wien".

Thanks,
-Leo
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