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@@ -31,6 +31,16 @@ in the use of the column prefix when using DBF as any additional characters
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will be chopped off.
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<p>If a MASK is present, it will be restored after the script finished.
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The script changes temporarily to the resolution of the given raster map.
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+<p>If an area has several categories in the selected layer (equivalent
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+to overlapping polygons in Simple Features), only one category will be
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+kept during the rasterization process. Statistics for the skipped
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+categories will thus be partial.
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+<p>
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+For example, if there are three areas: area 1 with cat 1, area 2 with
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+cat 2, area 3 with cats 1, 2. Only one category value of area 3 will be
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+used for rasterization, the other category value will be skipped. Thus
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+statistics for the used category value will be complete, while
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+statistics for the skipped category value will be incomplete.
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<p><!-- r.univar limitation -->
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Large amounts of system memory can be used when extended statistics
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(<em>first_quartile,median,third_quartile,percentile </em>) are being requested
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Jean-François Bourdon