custom transformation not functional mosaic dataset

larryzhang

Hello,

Recently practice and witness the following, which is reproducible in ArcGIS 10.4.1 and 10.5.1:

Background: 

• ArcGIS built-in (3 to 5-parameter) transformation between WGS84 and local datum, called 'Option 1' used by default in Mosaic Dataset;
• A more accurate (7-parameter) custom transform between WGS84 and local datum, called 'Option 2', which is used to take over Option 1 in Mosaic Dataset

Action:

• Option 2 is customized, which is also configured via Environment Settings (for takeover of Option 1), where NADCON file is managed under C or \Program Files (x86)\ArcGIS\Desktop10.5\pedata\nadcon folder

Symptom:

• When images with WGS84 (UTM) are loaded into a Mosaic Dataset (with local datum), the Option 2 is not functional, which still uses Option 1 for the transformation. It looks no takeover at all.
• However, if those images are directly loaded into ArcMap, it demonstrates two options: Option 1 and Option 2. When the Option 2 is selected, the transformation works fine. 

Any advice?

Regards,

larryzhang

thx, Xu,

Eventually, the issue is identified and fixed in mosaic dataset:

In addition to two local datum files (.las, .los) to be placed in 'C or \Program Files\ArcGIS\Pro\Resources\pedata\nadcon', the third file (.GTF), which is referred to 'GRID Transform File', is also required and copied to the user’s Application Data folder, in the ESRI Custom Transform directory as follows, saying hlzhang525:

C:\Users\hlzhang525\AppData\Roaming\ESRI\Desktop10.5\ArcToolbox\CustomTransformations

Similarly, to do same in image server, if this local transformation is applied to image services or dynamic caching ..

Regards,

ZHANGH @ ARAMCO