topic Re: Rasters comparison after load in Data Management Questions

Rasters comparison after load

Ulises — Wed, 28 Oct 2015 20:05:18 GMT

Maybe this one is an easy fix, but I just can't see the difference.

I have a raster dataset in a file geodatabase that looks smooth and good at all scales. I imported it to SDE geodatabase and set the same parameters for compression and pyramids (which I build after the import operation), but the raster looks very coarsely compared at small scales. Calculated statistics trying, but the results do not vary. Any suggestions are appreciated.

Thanks

Re: Rasters comparison after load

DanPatterson_Retired — Wed, 28 Oct 2015 20:32:54 GMT

little things, like are the cell sizes the same?

Re: Rasters comparison after load

Ulises — Wed, 28 Oct 2015 20:50:06 GMT

Hi Dan,

yes...same cell size.

Re: Rasters comparison after load

DarrenWiens2 — Wed, 28 Oct 2015 20:50:40 GMT

Can you provide a comparative screenshot? Is it just a display thing - have you applied the same kind and amount of stretching to each raster?

Re: Rasters comparison after load

DanPatterson_Retired — Wed, 28 Oct 2015 21:00:01 GMT

This link may help if it is purely a display issue

Improving the display of raster data—Help | ArcGIS for Desktop

but I didn't quickly see anything directly regarding SDE

Re: Rasters comparison after load

Ulises — Thu, 29 Oct 2015 13:40:31 GMT

Screenshots of the rasters...

File Geodatabase

SDE

Re: Rasters comparison after load

DanPatterson_Retired — Thu, 29 Oct 2015 14:27:58 GMT

And when you zoom in does it still remain crummy? Nothing in the link I provided suggested any clues if everything is identical?

Re: Rasters comparison after load

Ulises — Thu, 29 Oct 2015 14:55:16 GMT

As I zoom in the raster display better until it shows almost the same. I imagine there must be something about with the pyramids but I set the same parameters when creating them and yet can't make them display as expected. I recreated the pyramid just specifying the compression format and resampling method, but the result is the same.

Re: Rasters comparison after load

DanPatterson_Retired — Thu, 29 Oct 2015 15:19:12 GMT

Well, if that is the case, and everything is exactly as you said, then my only conclusion is that an SDE geodatabase handles pyramids and the like differently than a file geodatabase or there is a bug or something has been missed. I will defer to those that use SDE and can provide some enlightenment. Good luck

Re: Rasters comparison after load

DanPatterson_Retired — Thu, 29 Oct 2015 16:21:06 GMT

Unless this is coincidence, have a look at this thread and Robert's and Jake's answers

https://community.esri.com/thread/167734

Re: Rasters comparison after load

Ulises — Thu, 29 Oct 2015 17:09:59 GMT

Same thing...Diego is asking for the same issue.

Thanks for the info, Dan.