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Delaware 1937 Orthophotography
Delaware 1937 Orthophotography using Web Mercator projection
<div style='text-align:Left;'><div><div><p style='margin:0 0 0 0;'><span><span>Resolution: 1.0 Meter</span></span></p><p style='margin:0 0 0 0;'><span><span>Band: 1-band: Panchromatic</span></span></p><p><p style='margin:0 0 0 0;'><span><span>USDA Agricultural Adjustment Administration</span></span><span /><span><span>Black and White</span></span><span /><span><span>Scanned and georectified using ERDAS Imagine</span></span><span /><span><span>Flying height 40,000 feet, 6-inch focal length camera</span></span><span /><span><span>Scale: 1:20,000</span></span><span /><span><span>SRS: NAD83 HARN Delaware State Plane meters</span></span></p><p><p style='margin:0 0 0 0;'><span><span>These are scanned images from aerial photography flow in 1937/38 by the Agricultural Stabilization and Conservation Service, maintained by the National Archives. These images are presented as individual tiles, county-wide and state-wide mosaics. Initial purpose was to provide base for digitizing Historic Forest Cover in Delaware. The data set could be used for other similar change analyses.</span></span></p><p><p style='margin:0 0 0 0;'><span>1. Heads-up digitizing was used to create ground control points on the 1937 Images using the 1997 Imagery as a reference. Every attempt was made to create GCPs at a standard scale of 1:3,000, however, due to photo quality this was not always possible. The scanned images were then registered to those points. The ground control points were stored for each image tile along with the RMS error from the registration process. See the included tutorial file for more detail on the registration process. This document was used for training and reference by staff members doing the processing. 2. Registered images (1937 Corrected) were subsetted (i.e. cropped) to remove photograph borders, fiducial marks, and distorted edges. 3. Image subsets (1937 Sub) were grouped together by county and combined into image mosaics.</span></p></div></div></div>
USDA Agricultural Stabilization and Conservation Service
aerial photography
scanned images
historic images
forest mapping
orthophotography
imageryBaseMapsEarthCover
Delaware
Sussex County
Kent County
New Castle County
Newark
Georgetown
Lewes
Rehoboth Beach
Dover
Wilmington
Smyrna
Delaware River
Delaware Bay
<div style='text-align:Left;'><div><div><p style='margin:0 0 0 4;'><span>Public Domain Information, with citation to Delaware Archives, National Archives and Agricultural Stabilization and Conservation Service for the photography</span></p></div></div></div>
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