ModelBuilder: renaming of raster files during iterative model run

Question

I am using an iterative model to run a set of raster files (as list variables) through several tools, namely: 
1. define projection
2. build attribute table 
3. clip
4. project raster
5. resample
6. clip
7. calculate statistics

When the model reaches step 4 (Project Raster), it fails to execute. I identified the problem as being the numeric characters at the beginning of each filename in the intermediate dataset between steps 3 and 4; that is, the filenames that are output from step 3 (Clip) all begin with a number (e.g. 01_Clip.tif, 02_Clip.tip, 03_Clip.tif, etc.). These filenames were automatically generated by Model Builder when I built the model.

To remedy the problem, I manually changed each filename in that intermediate dataset, such that they end with a number (e.g. Clip_01.tif, Clip_02.tif, Clip_03.tif, etc.). However, as soon as I ran the model again, those filenames defaulted back to their original format, and the same problem occurred at step 4.

I am unsure of how to control the filenames if Model Builder automatically generates an unacceptable format at the start of each model run. Any suggestions would be greatly appreciated.

PoojaPandey1 · Answer

Hi Julie

I am using model builder to rename different dbf tables name, for the same using rename tool using inline variable %n%. The names are changed what I wish to do is instead of starting the series from 0, start it from 1, is it possible?

curtvprice · Answer

What is your ArcGIS version and SP? (See Help > About ArcMap) If not on the most recent, do update!

JulieButler · Answer

Hi Curt,

Thanks for your suggestion. Unfotunately, it does not work. I specified %scratchworkspace% as the Clip-output filename (I'm using 10.0), but the filenames default to the original problematic formatting (01_Clip.tif, 02_Clip.tif, etc.) as soon as I validate or run the model. I tried a similar approach yesterday by inserting a string variable names "scratch" and specifing "%scratch%" as a prefix to each filename. The same problem occured, however.

This seems as though it may be a bug within the version of Model Builder that I'm using. I'm surprised by how difficult it is to control the filename of intermediate datasets.  If you construct a an intermediate filename using a built-in variables, the system won't modify them when the model is validated. (Note, %scratchfolder% is 10.1 only, %scratchworkspace% would be used in earlier versions).

For example:

%scratchfolder%\clip_%n%.tif

will be interpreted at runtime as

D: \work\scratch\clip_0.tif
D: \work\scratch\clip_1.tif
...

Depending on the iteration, the built-in iteration variable used could be either %n% or %i%.

Hope this helps!