trying to set some parameters as optional in modelbuilder

ToreBorvik

Hi,

I have made a model where several parameters should be optional, but they are required and I cannot change it.

The attached screenshot shows two of the processes in the model. Process 1 is the only of all parameters I could set as optional. it is: single output map algebra (conditional statement) on an input raster

process 2, which can only be required; Less than Equal statement on a dtm, where the maximum elevation is a variable.

I have attached the screenshot of these two, the one I have as optional is marked with a black box while the one I can not set as optional is in a red box. I hope anyone has an idea.

modelbuilder.jpg

curtvprice

I have made a model where several parameters should be optional, but they are required and I cannot change it.

This is really by tool - the validation within ModelBuilder checks against the validation code for every tool to see what is can be optional and what cannot.

You would get maximum flexibility if you created model variables (standalone, not connected to a tool) of type Raster Layer. The rasters you want to be required can be set up as preconditions to a Calculate Value tool.

Then, use the Calculate Value tool (write a python function code block) to generate an expression which you can then provide as input to the Single Output Map Algebra tool. Doing it this way may be a bit tricky, but will allow to do what you want.