topic Re: Is it possible in Model Builder to use a String Variable and Get Field Value Variable to reference an input file for a tool? in ModelBuilder Questions

Is it possible in Model Builder to use a String Variable and Get Field Value Variable to reference an input file for a tool?

RichardG — Tue, 31 May 2016 11:28:27 GMT

I have a model which is set up to first iterate (using Feature Selection) through all points in a feature class using a unique value from field X (string).

The model then takes this feature and runs it through the Get Field Value tool in order to identify the attribute for any given feature from field Y (string).

This point is then fed into the Batch Watershed Delineation tool from the ArcHydro Toolset. Each of the input files for this tool are located in the same raster folder. Input files all begin with the same text. E.g. for Input Flow Direction Grid I have several files in my folder that start with "fdr" and end with the attributes gathered from the Get Field Value.

I created a string variable which points to the folder containing the raster files. I named this variablerasterLocation. I have tried to reference each of the relevant input files in the Batch Watershed Delineation Tool, e.g. %rasterLocation%fdr%Y%

However, I get the error message - "Input dataset does not exist or is not supported."

Re: Is it possible in Model Builder to use a String Variable and Get Field Value Variable to reference an input file for a tool?

FC_Basson — Tue, 31 May 2016 11:33:12 GMT

Looks like you are missing a slash after the folder path. Try %rasterLocation%/fdr%Y%

Re: Is it possible in Model Builder to use a String Variable and Get Field Value Variable to reference an input file for a tool?

RichardG — Tue, 31 May 2016 11:39:59 GMT

I have this included in the string variable (rasterLocation). The string variable appears with my personal computer information then \CatchmentDelineation\Layers\

Re: Is it possible in Model Builder to use a String Variable and Get Field Value Variable to reference an input file for a tool?

FC_Basson — Tue, 31 May 2016 11:49:54 GMT

Do the tool messages give you an indication of the dataset path?

Re: Is it possible in Model Builder to use a String Variable and Get Field Value Variable to reference an input file for a tool?

RichardG — Tue, 31 May 2016 11:56:24 GMT

The Batch Watershed Delineation tool messages says the following;

ERROR 000732 - Dataset %rasterLocation%fdr%HA% does not exist or is not supported.

This is repeated for each input file.

The messages for the individual input files are "The value does not exist"

Re: Is it possible in Model Builder to use a String Variable and Get Field Value Variable to reference an input file for a tool?

FC_Basson — Tue, 31 May 2016 12:00:11 GMT

Have you tried replacing the rasterLocation variable in your inputs with the actual path to test if it exists and works?

Re: Is it possible in Model Builder to use a String Variable and Get Field Value Variable to reference an input file for a tool?

RichardG — Tue, 31 May 2016 12:08:44 GMT

Thanks for your responses. Yes when I have specified particular files, the model runs fine and I get the desired output.

Re: Is it possible in Model Builder to use a String Variable and Get Field Value Variable to reference an input file for a tool?

FC_Basson — Tue, 31 May 2016 12:21:57 GMT

Does the rasterLocation variable need to be of type String? I would also try using it as a Workspace type variable, then you might need to add an additional forward slash in the dataset path.

Re: Is it possible in Model Builder to use a String Variable and Get Field Value Variable to reference an input file for a tool?

RichardG — Tue, 31 May 2016 13:15:33 GMT

I removed the rasterLocation string variable and added it as a Workspace type variable as you suggested. I named it rasterLocation again and added the forward slash.

The error messages remain.

Re: Is it possible in Model Builder to use a String Variable and Get Field Value Variable to reference an input file for a tool?

RichardG — Wed, 01 Jun 2016 08:48:13 GMT

I've solved the problem. The Get Value string variable refers to attributes which begin with '0'. I put some text before these attributes and edited the input file names and the model works perfectly now.

Re: Is it possible in Model Builder to use a String Variable and Get Field Value Variable to reference an input file for a tool?

curtvprice — Thu, 09 Jun 2016 05:35:15 GMT

You got it. Data set names, even temporary ones, should never begin with a number.

How To Name Things In ArcGIS

Re: Is it possible in Model Builder to use a String Variable and Get Field Value Variable to reference an input file for a tool?

RichardG — Mon, 04 Jul 2016 10:25:55 GMT

This is actually not the solution. The error messages beside the input file names only went momentarily. Once I clicked 'Validate entire model' the same error messages appeared.

The issue seems to be solely to do with the 'Get Field Value' reference.

The process works fine if I use the following path name for any given file %rasterLocation%fdrha03.

However, if I try to use the Get Field string variable (e.g. ha03, ha04, ha05 etc) then I get an error message. The path is set as follows %rasterLocation%fdr%HA%