3 replies to this topic

[NeverEasy]

Hello!

I have 11 rasters that I wish to sum together (R1 + R2 + R3...). They all have the same cell size and extent, however when I add them together many cells which should have a value >0 turn up as nodata. It seems that the cells that have nodata in even one of the rasters turnn out as nodata even after adding the rasters together (for example: 5+2+7+nodata+2+9 = nodata). What would be the easiest way around this?

Thanks!

[NeverEasy]

Okay, I found instructions that worked myself! http://support.esri....es/detail/34932

So nevermind I guess

But if anyone knows a faster way, feel free to share

[Gretchen Peterson]

If you want NoData to be zero you can use a con expression like:

Con( IsNull( [MyGrid] ), 0, [MyGrid] )

Do this to the grids first before summing them together.

[dsl]

Or reclassify your rasters to set NoData as zero...

Cheers,
David