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(Stranger )
01/10/03 02:02 PM
Best-Practice for Georeferencing Report this article as Inappropriate to us !!!Login to Reply

Best-Practice for Georeferencing (a.k.a. rubersheeting)

I?m trying to tune my G-Ref.

1.)In my scenario I take tiffs and insert them into ArcGIS. By using the FoC (Face of Curb) on the tiff and match it against my reliable planimetric FoC data that is allready entered into GIS I should be able to G-Ref the tiff in my GIS system.

2.)Next I fit it to its appropriate location on screen. I size the tiff so that it is lined up close as possible to the FoCs.

3.)Then begin Transformation (1st Order (Affine)).

Note: Where I get hung up is at that last step. I play the rubber sheeting game using about 3 or 4 control points. At that point curbs from the tiff are starting to line up with curbs on the my data. Once I move to the next transformation (2nd Order) OR add additional control points (Non-Parallel or Non-Adjacent to previous control points) the whole tiff looks like the toilet flushing screen saver, where all lines become warped and distorted.

Anyone that has knowledge in this area please reply with suggestions and examples. Any and all help is welcome.


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