Multiple geographic transformations for mosaic dataset via Python

cgarrity_USGS — Fri, 27 Sep 2024 15:30:42 GMT

Hello. We're unable to apply multiple geographic transformations to a mosaic dataset programmatically. I'm hoping it's a simple syntax issue on our end. SetMosaicDatasetProperties indicates that you can apply multiple transformations via list for {geographic_transform} parameter. I've included code below with the list parameters moved outside the function for clarity. These are all valid transformation members. ERROR 000800: The value is not a member of...

geographic_transforms_list = [

"NAD_1927_To_WGS_1984_79_CONUS",

"WGS_1984_(ITRF00)_To_NAD_1983",

"NAD_1983_HARN_To_WGS_1984",

"Old_Hawaiian_To_NAD_1983_HARN_Hawaii"

]

# Set the mosaic dataset properties and include map types

for map_type in map_types:

order_field = 'NEWEST' if map_type == '' else map_type

arcpy.management.SetMosaicDatasetProperties(

in_mosaic_dataset=mosaic_dataset,

allowed_mosaic_methods="ByAttribute",

default_mosaic_method="ByAttribute",

order_field=order_field,

sorting_order="DESCENDING",

geographic_transform=geographic_transforms_list

)

Re: Multiple geographic transformations for mosaic dataset via Python

PieterE — Tue, 01 Oct 2024 07:17:59 GMT

The good news:
It's not a simple syntax issue, you're code runs fine on a fresh created mosaic dataset.

The bad news:
This is possibly related to a BUG that we are also affected by. Namely that it is not possible to undo a certain transformation using arcpy.management.SetMosaicDatasetProperties.
Can you check which transformations are now already defined for your mosaic dataset?

The only workaround is to manually delete the transformation, that no longer exists in the transformations folder, from the mosaic dataset.

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Multiple geographic transformations for mosaic dataset via Python

Re: Multiple geographic transformations for mosaic dataset via Python