Structure from Motion orthomosaic of Vicksburg National Military Park in Vicksburg, MS created from 1962 aerial imagery

The dataset is a 0.5 m spatial resolution panchromatic (black and white - B&W) orthomosaic of northern Vicksburg, MS and Vicksburg National Military Park in 1962. It was created using structure from motion-aided photogrammetry techniques in Agisoft Metashape (v 2.1.1). The aerial images were acquired on February 10, 1962 by the U.S. Department of Agriculture at approximately 1:18,000 scale by a Fairchild T-12 Number 53-121 camera (9 inch x 9 inch frame) with a Bausch and Lomb Planigon XF6738 lens, calibrated focal length of 152.379. Digitization information is not available, it can be assumed that these photographs were converted to digital by a photogrammetric-quality digital scanning back system operated by the USGS EROS data center. In total 17 frames were downloaded, ranging from 1VAJR00020005 to 1VAJR00020010, from 1VAJR00020026 to 1VAJR00020030, and from 1VAJR00020037 to 1VAJR00020042. Ground reference was established through 16 ground control points, with horizontal coordinates acquired from 6 inch high resolution orthoimagery of Warren County, Mississippi, and vertical elevations acquired from a 1m DEM created from 2020 lidar. The dense point cloud produced by the SfM-aided photogrammetric process was classified to identify points lying on or near the ground; these ground points were then used to interpolate a DEM. The 45.8 cm spatial resolution orthomosaic was then generated using the DEM as the modeling surface.