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Digitising tablets
#21
Bob, I dont use a stitching programme because basically they don't work. It may look good but it is never accurate.

My suggestion is (especially if you are using MoL style planning sheets) that you scan each feature by centering it on the scanner. Name each scan after the structure/feature number and give it a gridsquare prefix (i.e 100/200-P23). Load up each individual scan into ArcView, trace the feature, save and move on. The error in such a method is limited to the error inherent in your scanner.

The joy of the single context planning system vis a vis a programme like ArcView is that you only need to georeference one plan in each grid square and then all other plans share the same co-ordinates. The
joy of gridded plan sheets is that you always have a background scale in which to test/measure potential distortion.



With peace and consolation hath dismist, And calm of mind all passion spent...
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Digitising tablets - by chiz - 15th April 2009, 11:53 AM

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