3 replies to this topic

[razornole]

Does anyone know of an easy way to delete the zero value for a raster in ArcMap 10? I've created a raster of 1s and 0s and multiplied it by my NED. Now I want to get rid of all my zero values or reclass them to NoData.

I could always reclass, but I would have to do that for all 255 values. In the end I will work on 8 different rasters so I don't want to manually reclass 255x8. Furthermore, every time I try to reclass they say that I must use an integer and not floating point.

Thanks,
kru

[David Medeiros]

Does anyone know of an easy way to delete the zero value for a raster in ArcMap 10? I've created a raster of 1s and 0s and multiplied it by my NED. Now I want to get rid of all my zero values or reclass them to NoData.

I could always reclass, but I would have to do that for all 255 values. In the end I will work on 8 different rasters so I don't want to manually reclass 255x8. Furthermore, every time I try to reclass they say that I must use an integer and not floating point.

Thanks,
kru

You might try the Extract by Attribute with the following clause: OutRas = Select(InRas1, "Value >= 1")

http://help.arcgis.c...00029000000.htm

You may need to build an attribute table for the raster first. I don't think reclassifying would be that difficult though. I think you only need to adjust the value for your 0 class. Raster Calculator may also work using a similar expression as the Extract tool.

[frax]

You can also use Set Null: http://resources.arc...z0000000m000000

[razornole]

I've tried extracting by attribute and ArcMap just keeps sending me to jail regardless of the expression that I use (i've tried many variations. See attachment, I just get bars of 0 value and NoData.

Set Null doesn't seem to work either as it automatically returns a 0 value and NoData as false. The only value that I want true is 0.

Thanks for the help, I know how to fix this in Photoshop, was just trying to learn ArcMap better.

kru

Attached Files

•  go_to_Jail.jpg   500.46K   8 downloads