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| GeoCommunity Mailing List |
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| Subject: | [gislist] Advice on heads-up digitizing |
| Date: |
05/24/2007 06:08:45 AM |
| From: |
Gillian McGregor |
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Advice on heads-up digitizing in Arc9 - creating landuse data from black and white aerial photos:
We are woking with time series photos, captured at a scale of 1:20 000 to about 1:50 000. The pixel size of the photos in their scanned form is about 6mx6m. Pixelation is evident at a scale of about 1:12 000.
1. Can someone advise what would be a reasonable scale to digitize at, and suggest how we would justify this choice?
2. Can anyone direct us to literature on the levels of error encountered when using un-ortho-rectified images or advise based on experience?
Thanks
Gillian McGregor
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