V8i GeoTIFF Georeferencing, Export and Reprojection

Mac Jaysen — Tue, 23 Feb 2016 19:19:13 GMT

Hello,

I'm trying to export warped TIFFs as GeoTiffs in SELECTseries1 and need help with the geocoding configurations. So far I've been georeferencing these in the dgn's native NAD83 coordinate system, exporting them, and then re-importing successfully with an uninherited GCS, but now I'm in need of georeferencing files with coordinates in NAD1927 and permanently converting those to align with the other NAD83 GeoTiffs.

I set a separate dgn's master coordinate system to NAD1927 and referenced the rasters normally — at this point there is nothing assigned and the geocoding properties show <none> as expected. Before exporting, in my workspace preferences I set the following configs:

*toggle Use Unit Definition Geokey if Present (override PCS unit); *set GeoPriority = File; * Inherit GeoCS from Model = Not Inherited

Then I select *GeoTiff and set *Resampled = Yes and GeoCoding to *Take GeoCS From: Name Specified > NAD83(HARN)

Now I was under the impression that this is all that is required to have a GeoTiff with an independant datum stored in it's raster header (since it's a GeoTiff and doesn't need a sister file), and I can clearly see that the raster shifts over in the target (NAD27) dgn to it's proper NAD83 destination location. But when I try to re-import that into a NAD83 dgn, the raster shifts with it and is incorrectly projected as it was in the target.

My work-around was to wait until I had warped a few TIFFs and then reproject the entire design file into my destination CS, which takes all of the rasters with it. However, this is just a reprojection and doesn't permanently rewrite the GCS if I export it as a GeoTiff in this setup — even if I set it to be resampled. Now the really strange thing is that all of my GeoTiffs exported natively in the NAD83 dgn are able to be imported into the NAD27 dgn and individually reprojected to NAD27 and saved permanently as such, but it doesn't recognize it the other way around.

Side note: I have 60,000 of these to make. Any way I can do any of what I need to above in a batch export/conversion?

Any help would be appreciated — thanks in advance.

Mac Jaysen's Activities

V8i GeoTIFF Georeferencing, Export and Reprojection