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| GeoCommunity Mailing List |
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| Mailing List Archives |
| Subject: | [gislist] Imagery vs. GIS scale |
| Date: |
12/08/2004 11:05:02 AM |
| From: |
Anthony Quartararo |
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I've probably asked this one before, I cannot remember whether I have or
not, so my apologies if this is redundant. What would be the maximum
least-common effective RF scale of a GIS dataset that was digitized from a
1m color orthorectified satellite image ? Put another way, if we use a 1m
color ortho satellite image to extract features (ie. Roads or rivers) and
create layers in a GIS, what would be the largest scale that the resulting
GIS dataset would have with any degree of confidence ? For example, a 1m
image can be "zoomed" in when viewed in ArcInfo, to a "scale" of 1:2000 and
all the desirable features are clear and crisp, ready for "digitizing" and
extracting. If this scale of 1:2000 of the imagery is kept consistent
during the digitization, what would be the resulting RF scale of the GIS
data that was digitized ? Is there a formula to work this out for varying
scales of the image "zoom"? Thanks in advance.
Anthony
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