Multiple reclassification using RasterCalc in QGIS

Question

Is there any way to perform multiple reclassification using RasterCalc?

For example reclassifying value 1 to 100 in map Map can be written as:

eq([Map]@1, 1, 100)

But if there are multiple values to reclassify in one operation, how can I do it? For example reclassifying value 1 to 100 AND 2 to 200 in map Map.

eq([Map]@1, 1, 100), eq([Map]@1, 2, 200) //<-This does not work!!

Please give me a advice.

Not sure that it is possible with RasterCalc. But you may try this: eq([eq([Map]@1, 1, 100)]@1, 2, 200) — SS_Rebelious, Mar 31 '13 at 18:17

score 0 · Answer 1 · answered Mar 31 '13 at 18:12

If you have installed SEXTANTE and SAGA/GRASS then you could also just use those functions.

Both come with a reclassification function (r.reclass in GRASS and "Reclassify Grid Values"), which support so called rules. In a "rules file" you could simply specify multiple reclassifications.

Multiple reclassification using RasterCalc in QGIS

1 Answers1