About Raster Calculator error

Question

Dear all

Beacuse our professor ask us to make each grid into table ( he sayed that let each grid exist number...

so i need to use raster calculator

Professor give us formula :  [your dem] - [your dem] + $$rowmap * $$ncols + $$colmap

ps. My original dem is alisan20mdem

and it will into.....like this pic

(my prsfessor 's version is 9.3 and I was 10.2.2 )

so..i type formula on and got error message

At first i thought that problem is about Alisan20m1.img , so i delete it

but i found the main problem is $$rowmap !!!  if i type it on  , it would show error message .

but i leave the formula that[ Alisan20m1.img - Alisan20m1.img ] and the message disappeared .

what can i do ?? please teasch me....thank you very much

curtvprice · Answer

I don't think there is an easy way to do this in 10.x.

I would look into the Create Fishnet tool, which will create polygons on a regular grid.

What exactly are you trying to accomplish?

instant-app-ago-ga.png

EdmondKe · Answer

Dear Curtis

I have linked that the net of your posted

I donnt know how to use the code that you shared.

I am so sorry that i am not good at reading english ..(I am taiwanese

can u tach me how to do that step by step ? plz...

curtvprice · Answer

$$ROWMAP and $$COLMAP are not supported in the 10.x Raster Calculator. Sorry about that. There are some workarounds but they aren't pretty and involve using Python scripting - not the Raster Calculator.

$$NCOLS + $$ROWMAP in ArcGIS 10 Python map algebra‌