Zonal statistics results in some NULL values in QGIS?

I used zonal statistics through QGIS to assign raster image values to polygons.
Here, Raster image has value in range from 0 to 238.567.

As a result, some NULL values are assigned to polygons,
even though raster image fully covers those polygons.

When "count" is assigned to zero, statistical values are set to NULL. But such a polygon is still on the raster image(at least visually).

What's wrong with it ?

PolyGeo♦

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asked Apr 28 '17 at 3:11

Ichiro

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Did you try to zoom in map to cell with NULL value and get cell value from original raster ? – Shiko Apr 28 '17 at 3:20
Yes, I've checked and cell value was not NULL. – Ichiro May 2 '17 at 17:39

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