Warning Possible Lack of Accuracy in Satellite Aerial Images


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Warning Possible Lack of Accuracy in Satellite Aerial Images

Postby arthurohara » Mon Jun 11, 2012 11:18 pm

I refer to notes on the map warning other editors to check GPS Points for correct road alignment where satellite imagery appears offset.

With respect, maybe this is an appropriate time to remind editors of a possible lack of accuracy in satellite aerial imagery, which goes as follows:-

"It is Best map editing practice to align the geometry of the road with the aerial image. Routes created by GPS can be inaccurate. By matching the road tightly to the image of the road it is more likely that a client device will correctly lock to that road.
But aerial images are taken by satellite from great heights and sometimes extreme angles. Very clever algorithms are used to correct distortions, but these adjustments cannot be perfect and in some areas the aerial images are not accurate. Example. In such cases the GPS tracks are a better guide to the actual location of the roads, and it would be wrong to align the roads to the aerial image."

Read original here:-

Best regards,

Tue 12 Jun 2012 0018 GMT Daylight Time Wk. 24.
Arthur O Hara
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