Con expression in two rasters ArcGIS, raster calculator

Question

I would like to write a condition in ArcGIS 10.1 in Raster calculator.

I have 2 overlapping rasters (Ras1.img, Ras2.img) with different attributes in attribute table:

I want to change pixel values Class in Ras1.img based on the values in Att, Ras2.img. something like:

if ((Ras1.img, Class == 20 & Ras2.img, Att == 5), then change Class value 20 in Ras1.img  to Class 25))

I can't figure that out. It is super simple in R, but I have no idea how to make it in ArcGIS 10.1.

and applying something like:

Con(("landuse1" == 1) & ("landuse2" == 5), "landuse1" + "landuse2", 99)

but I don't understand where I specify the attributes of my rasters I would like to change?

Rasters usually have only thing which 'Cell value', no attributes. Indeed Raster calculator uses the Cell Value for the 2 rasters while comparing. — Shiko, Commented Dec 2, 2016 at 9:51
when I tried just a simple expression i.e. Con(("Ras1" == 20), 0, 25) , I didn't get back a correctly reclassified output.. So I think I am making something wrong.. — maycca, Commented Dec 2, 2016 at 9:53
Question please, the reclassified rastes you have were produced from ArcGIS supervised/unsupervised tool ? — Shiko, Commented Dec 2, 2016 at 9:59
yes, Raster1 yes. The second is the true type of landuse, by which I want to correct my classification results — maycca, Commented Dec 2, 2016 at 10:00
What I know that the output of supervised classified is not exactly RASTER image, even you may check the output file type. May be you need to convert this image to Raster. — Shiko, Commented Dec 2, 2016 at 10:05

Stella · Accepted Answer · 2017-12-07 21:39:33Z

1

Open this tool and you should be able to input your raster, then redefine pixel value(s).

answered Dec 7, 2017 at 21:39

Stella

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@maycca if you liked this answer please "accept" it so the question does not show as unanswered
– Stella
Commented Apr 17, 2018 at 16:43

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