topic Re: Exporting a georeferenced TIFF in Data Management Questions

Exporting a georeferenced TIFF

MichaelThompson2 — Mon, 19 May 2014 16:29:34 GMT

I've searched high and low and haven't found a solution to this issue and I'm stumped!

I was given a .cgm file and asked to georeference and output a TIFF from the georeferenced file. I used 4 control points to georeference the image after adding it to my map as a .png file. When I export the result is a TIFF image along with .aux, .tfw, and .ovr files. The TIFF thumbnail is a solid black rectangle, though, and it opens up in the program the end user is trying to use as a black rectangle. Anyone know what I am doing wrong?

Also, the end user says the other georeferenced TIFFs he has include a .tif, .aux, and a .rrd if that helps at all.

Thanks!!

Re: Exporting a georeferenced TIFF

Luke_Pinner — Tue, 20 May 2014 01:43:05 GMT

Did you georeference then use the Rectify... menu?
If so, did you leave the No Data value at its default of 256?
If so, your output raster was saved as a 16bit tif. To display it properly, build statistics or change/remove stretch in the layer properties->symbology tab. Alternatively, set NoData to 0 when exporting and your tif will be saved as 8 bit and should display properly.

The different associated files are nothing to worry about. ArcGIS uses a new raster library "under the hood". The old library created .rrd files to hold the reduced resolution overviews (pyramids), while the new library saves them to a .ovr file.

Re: Exporting a georeferenced TIFF

MichaelThompson2 — Wed, 21 May 2014 13:21:04 GMT

Did you georeference then use the Rectify... menu?
If so, did you leave the No Data value at its default of 256?
If so, your output raster was saved as a 16bit tif. To display it properly, build statistics or change/remove stretch in the layer properties->symbology tab. Alternatively, set NoData to 0 when exporting and your tif will be saved as 8 bit and should display properly.

The different associated files are nothing to worry about. ArcGIS uses a new raster library "under the hood". The old library created .rrd files to hold the reduced resolution overviews (pyramids), while the new library saves them to a .ovr file.

Thanks for the suggestions, Luke! I tried them all but I was still having issues. One of the ArcGIS savvy guys was able to get me straightened out. Apparently all I need to do was bring the image into ArcMAP, georeference it, and then just use the "Save Georeferencing" option in the drop down menu. Simple as that.

Once I got the two images figured out and saved properly my end user sent me a whole bunch more! Ain't that how it always works?

Thanks again!