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Satellite imagery is generally not labelled according to potential mapping scale, due to the indirect relationship between the two concepts. WR Tobler's rule of thumb is "divide the denominator of the map scale by 1,000 to get the detectable size in meters. The resolution is one half of this amount." For your scales, that would mean 2.5m resolution imagery ...


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If you know that you can refine the GCP later, write the georeferencing result to a vrt file using the GDAL batch conmmandline export. You can edit that later with any text editor, and add additional GCP's. Re-georeferencing a tif is more complicated, because the first round you georeference ageianst pixel coordinates, while the second run uses the ...


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As stated above, I'd try USGS Earth Explorer for data in the US. Your scales are pretty large. Especially 1:5000, for which you could look for 'Hi-Res Orthoimagery' with Earth Explorer. USDA NAIP imagery exists for almost everywhere in the US at 1 meter resolution. Historical imagery can be found on Earth Explorer as well. You could use the National ...



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