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The aerial images were acquired on June 14, 1938 by Pan American Aerial Surveys for the U.S. Department of Agriculture at approximately 1:20,000 scale by a Fairchild K-10 or similar aerial camera with 5in x 7in frame. The images, archived together with other unrelated aerial imaging projects on film rolls, were accessed at the National Archive in College Park, MD and scanned to digital using an Epson scanner at 2400 dots per inch with 16-bit radiometric resolution. In total 14 frames were scanned, ranging from AVM-3-13 to AVM-3-23A and AVM-2-129 to AVM-2-132. Of these 14 frames, only 4 (AVM-3-19 - AVM-3-122) were found to be useable for SfM-aided DEM generation. Ground reference was established through 83 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.

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This product depicts the spatial coverage of seagrass beds from 0.5-m color-infrared orthoimagery for Cat Island, Mississippi from early fall of 2023. Specifically, the map includes presence and absence of seagrass beds within a potential seagrass extent that was based on topobathymetric data. A minimum mapping unit of 4 square meters was used for this mapping effort. We did not have complete coverage for this map due to cloud shadows or lack of imagery. Areas that were not classified but were expected to have potential seagrass coverage based on water depth (i.e., less than or equal to 3m depth relative to the North American Vertical Datum of 1988) were classified as "9999."

This dataset represents aerial photography of the Natchez Trace Parkway that was taken in late September and early October of 2004. Images were acquired during leaf-on conditions as required by the National Park Service (NPS) to accomplish their ground-based vegetation classification. Nearly 400 aerial photography frames were scanned and orthorectified to generate digital orthophoto quarter quads (DOQQs). These were cut to match existing DOQQs creating a total of 235 DOQQs for the entire 715 km long Parkway. For ease of use, the DOQQs were grouped into 11 mosaics, each covering a section of the Parkway. At the request of the NPS, each mosaic was divided into ten tiles to allow for efficient loading on less robust computers.

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The dataset is a 3 m spatial resolution Digital Elevation Model (DEM) representing terrain heights in northern Vicksburg, MS and Vicksburg National Military Park in 1938. The DEM was created using structure from motion-aided (SfM-aided) photogrammetry techniques in Agisoft Metashape (v 2.1.1). The aerial images were acquired on June 30, 1938 by Pan American Aerial Surveys for the U.S. Department of Agriculture at approximately 1:20,000 scale by a Fairchild K-10 or similar aerial camera with 5in x 7in frame. The images, archived together with other unrelated aerial imaging projects on film rolls, were accessed at the National Archive in College Park, MD and scanned to digital using an Epson scanner at 2400 dots per inch with 16-bit radiometric resolution. In total, 14 frames were scanned, ranging from AVM-3-13 to AVM-3-23A and AVM-2-129 to AVM-2-132. Of these 14 frames, only 4 (AVM-3-19 - AVM-3-122) were found to be useable for SfM-aided DEM generation. Ground reference was established through 83 ground control points (GCPs), with horizontal coordinates acquired from the 2017 high-resolution orthoimagery (HRO) 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 with a spatial resolution of 81.6 cm. Errors and noise in the DEM surface were reduced through filtering and then resampled to 3 m using bilinear interpolation.

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This data set contains ortho-rectified mosaic tiles, created as a product from the NOAA Integrated Ocean and Coastal Mapping (IOCM) initiative of the Mississippi River (Baton Rouge to LaPlace, the Louisiana shoreline, the Lake Charles area, and LaPlace to Venice). The true color images were acquired with an Applanix Digital Sensor System (DSS). The original images were acquired at a higher resolution than the final ortho-rectified mosaic. Ortho-rectified mosaic tiles are an ancillary product of NOAA's Coastal Mapping Program (CMP), created through a wider Integrated Ocean and Coastal Mapping initiative to increase support for multiple uses of the data.

For the Louisiana shoreline, the purpose of the imagery was to provide digital shoreline and orthophotos for NOAA nautical charts. The shoreline area covers the Barrier Islands of Terrebonne and Timbalier Bays on the coast of the State of Louisiana.

For Baton Rouge, source imagery was acquired on March 13, 2010, March 14, 2010 and March 15, 2010. The ground sample distance (GSD) for each pixel is 0.5 m. These data are in .his, .tif, and .jpg formats with associated metadata. Additional orthoimagery for this region (Baton Rouge to Southwest Pass) are filed under NODC accession numbers 0103945 and 0104414. Additional ortho-mosaic data is available at the NODC under individual accession numbers.

Ortho-rectified mosaic tiles are not intended for mapping, charting or navigation.

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