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Tutorial 8 - Georectifying Imagery 101

Tutorial 8 - Georectifying Imagery 101

In this tutorial I show you how to georectify an image in Global Mapper

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written by AnotherName, February 07, 2008
So the reason the PDF is not shifted further to the right (to match the image better) is because of the resolution of the background data?
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written by Paul Tocknell, February 07, 2008
Yes, exactly!

In other words, the airport is not to scale. Airports are enlarged on the aeronautical chart to make for easier reading. Help your pilot find the airport! That is a good thing.

It also doesn't help that the aeronautical chart is orginally Lamber Conformal Conic and my project was Geographic. All those things contribute to the skewing of the aeronautical chart.
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written by surveyorjoe, March 27, 2008
very good, thank you
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written by Shane, April 03, 2008
You mentioned nothing of the overall offset b/t the PDF and the map. It looked to me to be a complete image offset of ~500ft X and Y. I have this same problem with USGS DRG Topoquads. I have to shift all GCPs based on a real point than I know the real lat long position. No matter what projection or datum I use. The offset is still proportional by x/y ratio. Any similar problems?
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