Function Thumbnails not appearing in Image Service

Question

When I create thumbnails for my raster function templates and reference them from a folder that is accesible to the GIS Server, I still dont see them preview when I view them in the Map Viewer.

Is there a best practise for getting thumbnails to flow through to the Map Viewer interface?

EarlMedina · Answer

If you're seeing this behavior with ArcGIS Server 10.6 then this will be: BUG-000111485: The raster function templates for image services do not load in the ArcGIS Online map viewer.

The issue is caused by the { } characters in the exportImage request which corresponds to the Thumbnail shown when navigating to the Image Display rendering properties in the Map Viewer - HTML encoding fails and { } are not properly translated to %7b and %7d, respectively.

An example of a properly translated exportImage request:
https://gisserver.test.com/server/rest/services/testRaster/ImageServer/exportImage?bbox=-90.00000000000901,-89.99999999998198,89.99999999997297,90&imageSize=400,400&f=image&renderingRule=%7b%22rasterFunction%22%3A%22Classified%22%7d

SimonJackson · Answer

Bumping.  Let me know if you need more info.