Select rasters in Mosaic Dataset

Question

Hi all!

I have a question about selecting rasters in a Mosaic Dataset and do processing on those.

I need to calculate a basic image ratio on two rasters in a mosaic dataset (Ex: Raster1/ Raster2) using Python. I know about the GitHub - Esri/raster-functions: A curated set of lightweight but powerful tools for on-the-fly image processing and rast… , but all the functions apply on the entire Mosaic Dataset, and I did not find any on how to process rasters separately. While I can do the work with the Image Analysis window in ArcGIS Desktop, I did not find any way to automate this in Python/arcpy.

Thanks for any help!

Alin

AlinPlesoianu · Answer

I did the full workflow again, and it works like that, but the main difficulty was to get it done with arcpy (Edit Raster Function—Data Management toolbox | ArcGIS for Desktop ), as I have many datasets like those. If I export the function chain as a template, it will refer to the same two mosaics, right? How can I make the template apply for any inputs?

Thanks!

Alin

jskinner · Answer

I could not reproduce this.  I have two mosaic datasets (Stadium_2010 & Stadium_2008).  I first ran the Divide tool on the two mosaic datasets to see the result.  I then applied the Arithmetic function to the Stadium_2010 mosaic dataset specifying the Stadium_2008 mosaic dataset as the second raster.  When identifying and comparing the Divide tool result with the Stadium_2010 mosaic dataset, the results are the same.

AlinPlesoianu · Answer

I did this, but it only processes the Mosaic Dataset on which the function is applied:

This is the raster function inserted. The first Mosaic Dataset is a one-band NDVI. I added the second one (Raster_Change_Detection_2_2) by browsing to the location on the GDB.

The processing result is not correct. The function divides the values of the same first Mosaic Dataset, and I only get a value of 1, as below:

Thank you very much!

Alin