Previously I have received assistance with determining a workflow for digitized maps and I was wondering if someone has come up with some best practices for digitized historical aerial imagery?
For now, our workflow goes something like this:
- scan contact prints at 600 dpi, TIFF, no compression, no enhancements applied (~4000 air photos)(Epson Expression 10000 XL)
- crop and tweak as necessary (brightness, contrast, levels, sharpen) maintaining the original scan for archival purposes (Adobe Photoshop)
- "photomerge" multiple images together to create 'chunks' or "mosaics" of imagery (using Adobe Photoshop)
- georeference the 'mosaics' in ArcGIS 10.2.2 using spline transformation and cubic convolution
- create a mosaic dataset of the georeferenced imagery
- serve up a modified copy of the footprints to AGOL to provide users with an index and links to download the mosaics from our FTP site.
Here is the index so far: http://www.arcgis.com/home/item.html?id=1b1ba3dd10e0476d8c71d97279b459ba
Samples of the mosaics may be accessed here: ftp://ftp.library.brocku.ca/Niagara_54_55/
I potentially have access to ArcServer with Image Extension but wonder about alternate options unless nothing is as good as using Server?