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
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!
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.
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!
One thing you can do is to create two mosaic datasets, one for each Raster_Change_Detection. You can then apply this Arithmetic function to one of the mosaic datasets. You will have the option to select the 2nd mosaic dataset for 'Input Raster 2'.
Thanks for the answer, Jake!
I know about that section, but my problem is a little bit different. While I can insert raster functions to the separate rasters in the Footprint (say NDVI), I cannot create a general function (at the Mosaic Dataset level) that takes as input same rasters from the mosaic dataset and do an arithmetic operation for example.
Below I attached screenshots of the mosaic, and the Arithmetic Function.
These are the rasters inside the mosaic dataset. They are a separate 1-Band Mosaic Datasets of different years. (Crated with: Creating a mosaic dataset containing raster data from multiple dates—Help | ArcGIS for Desktop )
On them, I need to apply the difference "Raster_Change_Detection_1_1" / "Raster_Change_Detection_2_2" on-the-fly.
If i go to the Mosaic Functions tab, I cannot choose those two rasters.
Is there a way to do this? Suppose there is a way with raster functions, I can further use arcpy to automatically do this analysis.
Thanks again!
Hi Alin,
Take a look at the sections:
in the following help document:
Editing function chains in a mosaic dataset—Help | ArcGIS for Desktop
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