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

[JayantaPoddar · Accepted solution]

An additional parenthesis when using &.

like

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

[DitlevReventlow]

It works, thank you so much!!! Very gratefull!

[DanPatterson_Retired]

For your immediate concern... you should not be working in folders that contain a space...

In the future, you might want to look at Extract by Attributes—Help | ArcGIS for Desktop

​since you have the spatial analyst.  This will produce simpler approach and can be easily be put in a loop

[DitlevReventlow]

Okay I have done all my modelling working in this folder. What could the effects of it be?

[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]

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.