topic Orthomosaic display settings in ArcMap Questions

Orthomosaic display settings

SimonCrutchley — Mon, 30 Nov 2020 17:08:07 GMT

I created an ortho mosaic from a number of orthophotos and opened it in ArcGIS 10.3.1 for Desktop. Although the 'Visible Scale Range' is blank, the photos don't appear till your down at c1:1500, which is no use for getting a general overview. Are there some hidden settings I'm missing?

Thanks

Re: Orthomosaic display settings

Anonymous User — Mon, 30 Nov 2020 22:39:29 GMT

Hi, I'm assuming you added the photos to a mosaic dataset? If not, then I'd be keen to know how you did it.

Have you built overviews on the mosaic? These are generalized tif images separate from your source rasters which participate in small scale depictions of your mosaic. For file Geodatabases they are stored in a folder alongside the fGDB.

there are tools in the mosaic dataset to define and build overviews.

It's best to try those two in sequence leaving the defaults and see what happens.

to access them: right click on your mosaic dataset (in the geodatabase and not in ArcMap):

Optimize -> Define Overviews

Optimize -> Build Overviews

hth.

Re: Orthomosaic display settings

SimonCrutchley — Fri, 04 Dec 2020 10:33:16 GMT

Hi David,

Thanks for that. I'm new to orthomosaics and was unaware of the overviews. That seems to have worked perfectly.😊