Clea Rome Conservation Planner Clallam Conservation District (360) 452-1912 Ex.112 Clea-rome@wa.nacdnet.org
and
Joe E. Holtrop, District Manager Clallam Conservation District 111 East Third Street, Suite 2A Port Angeles, WA 98362 phone: 360-452-1912 ext. 103 fax: 360-452-5088 webpage: <http://clallam.scc.wa.gov/> email: joe-holtrop@wa.nacdnet.org
Photo project number DYE-1DD, dated 8-16-63, lens # 791666, CFL 209.63 mm.
This image dataset was created from 7 24" X 24" photo enlargements which were scanned at the Facilities Records Department at the University of Washington. The resulting 400ppi TIFF files were orthorectified, mosaicked, and tiled into rectangular sections approximately 4900+ meters by 7000+ meters. (Sections are roughly the extents of slightly overlapping USGS Digital Ortho Quarter-quads found at <http://duff.ess.washington.edu/data/raster/doqs/>). Data does not necessarily fill each section completely.
NB: There were several scanning errors in these photos (splitting, smearing). The photos were mounted on thick cardboard and had an edge-binding on them which made them sticky to feed through the scanner. Photo DYE-1DD-156 (furthest south in the set) had some of the worst problems, and furthermore was mounted in such a way as to obscure all of its fiducial marks. These conditions compromised the orthophotos' overall accuracy.
Scale approximately 1:7500
amX: 2.0104 amY: 2.0907 amZ: 5.0669
Average residual values for the X, Y, and Z control point coordinates from ERDAS Imagine OrthoBASE Triangulation Report (measured in meters):
aX: 0.1448 aY: -0.0324 aZ: 0.8520
Root mean square errors (standard deviation) of all X, Y, and Z from ERDAS Imagine OrthoBASE Triangulation Report (measured in meters):
mX: 2.2230 mY: 2.4980 mZ: 4.7573