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Extracting raster values according to different classes

DitlevReventlow

Hey everyone.

I have a raster dataset (bshl_112p_srf) that I want to split up according to the classes that I have defined.

These classes are defined as:

158-535

535,0000001-686

686,0000001-1473

I have tried to use raster calculator to do this but it doesn't work. To extract the first class I tried to type:

Con("bshl_112p_srf" <= 535,"bshl_112p_srf")

, however I get an error for this expression.

What do I do wrong? Also, how would you extract the middle class (where you both need to have a <= and >= ).

Would it be something like:

Con("bshl_112p_srf" >= 535,0000001 & <=686,"bshl_112p_srf")

Thank you!

best regards

Ditlev Reventlow

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Accepted answers

JayantaPoddar

An additional parenthesis when using &.

Class 1 = Con(("bshl_112p_srf" >= 158) & ("bshl_112p_srf" <= 535), "bshl_112p_srf")

Class 2 = Con(("bshl_112p_srf" > 535) & ("bshl_112p_srf" <= 686), "bshl_112p_srf")

Class 3 = Con(("bshl_112p_srf" > 686) & ("bshl_112p_srf" <= 1473), "bshl_112p_srf")

Hope this will work

All comments

JayantaPoddar

Class 1 = Con("bshl_112p_srf" >= 158 & "bshl_112p_srf" <= 535, "bshl_112p_srf")

Class 2 = Con("bshl_112p_srf" > 535 & "bshl_112p_srf" <= 686, "bshl_112p_srf")

Class 3 = Con("bshl_112p_srf" > 686 & "bshl_112p_srf" <= 1473, "bshl_112p_srf")

IanMurray

I see nothing wrong with your first statement, works fine for me.

Your middle class would need to be

Con("bshl_112p_srf" >= 535,0000001 & "bshl_112p_srf" <=686,"bshl_112p_srf").

Are you wanting to split them into three seperate rasters or truly make a new raster with 3 classes in it for each range with the same value? If so you might want to check out the Reclassify Tool.

ArcGIS Desktop

DitlevReventlow

Great thanks!

DitlevReventlow

Thanks for mentioning the reclassify tool. I had not tried to use it yet. I don't think I need it in this case though. It is probably more usefull for me to have 3 individual rasters.

DitlevReventlow

I tried to copy your statements but I get error 000539 error running expression rcexec().

What could the reason for this be?

JayantaPoddar

You need to copy the Con() statement only. Try selecting the layers from Layers and Variables in Raster Calculator dialog box. One expression for each output raster.

DitlevReventlow

I typed in raster calculator with those variable and expressions:

Con("bshl_112p_srf" >= 158,0000001 & "bshl_112p_srf" <= 535,"bshl_112p_srf")

It works now, but the output raster is first of all still covering the whole input original raster (not only the interval mentioned) and also the values are just termed 1. So all values have been reclassify to class 1, even though they were not inside the interval.

I would like to keep the original values (e.g. 535 instead of the new class 1) and only extract the values that are inside the interval. How can this be done?

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