The digital images were created by scanning the
original maps on a large-format flatbed scanner. The maps were scanned
by KBP Reprographics of Wichita.
Each image was produced by scanning the item at a resolution of
300 dots-per-inch and saved in TIFF format. These TIFF files, which
average approximately 180Mb, are stored on CD-Roms.
Following scanning, the TIFF files
were not enhanced. In most cases, the images were cropped
to the outer border of the map.
The TIFF files were compressed, using
a wavelet-based image compressing software called Multi-Resolution
Seamless Image Database, or MrSID. This software integrates multiple
resolutions of an image in a single file which enables Internet
users to zoom in, getting more and more detail. The images
were compressed at a ratio of 22:1 without experiencing any loss
The final step was the creation of
a small JPEG file for use as the initial thumbnail display of the
The site is best viewed at 1024 x
768 monitor resolution.