What's Included
The map features ~12-14 data layers, most of which are included to either provide orientation, context, or search/query content. All of the layers are searchable, however, so that if you know you want to see that portion of the river that was overlooked by Saint Francis of Xavier Cemetery in Williamsport, IN, you could either do a search for "Williamsport" and then pan over to the river, or do a search for "Xavier Cemetery" and zoom straight to the cemetery. See below for a list of layers and their searchable attributes.
Processing the Wabash River Maps
Of course the main collection represented here is the orthophoto set. In the summer of 2006, volunteers from the Wabash and Erie Canal Park scanned over 30 images and maps and returned those images as tif files to EAS on DVDs. Each orthophoto image was ~170MB, 400dpi, grayscale. The topos were scanned in color and ended up at ~550MB each. They were "dumb" images at this point, however, and had to be rectified, or fixed to the earth, so they could be delivered from within (or to) a spatially-aware environment. This rectification was performed in the EAS Library using the native georeferencing of ArcGIS Desktop ("adjust" transformation), referencing against a number of known mapsets like the 2005 Indiana Orthophoto set and USGS DRGs. The resulting files were saved out as geotiffs at ~300MB for the aerials and ~1.45GB for each topo.
They were "dumb" images and had to be rectified so they could be delivered from within (or to) a spatially-aware environment
The Collars
Each of the aerial images has been included with its collars, that is with the white, non-image space that resulted from placing the irregular shapes of the river photos onto regular rectangular book pages. We're including the white space here in order to retain the feel and charm of the source material, even though it results in some portions of the river being obscured by overlapping pages. If something is being obscured in these photos that you really need to see, you can download individual photos by using the 'i' button to identify the one you want, then clicking "details & download" from the query results.
Layers
You know about the photos and topos. Full FGDC metadata documents are available for each of these photos. A sample can be found by clicking here, and the rest can be accessed by querying the images on the map itself. The rest of the layers, including the attributes that are available for searching, are listed below:
USGS NED Shaded Relief(not searchable)
