CCZO -- GIS/Map Data, Photographic Imagery -- 1933 aerial imagery composite -- Calhoun Experimental Forest, SC -- (1933-1933)

The zip file contains a large tiff mosaic stitched together from a series of aerial photographs of the Calhoun CZO area taken in 1933, when the area was being acquired by the US Forest Service. USFS archaeologist Mike Harmon delivered the black-and-white photographs, known to him as the 'Sumter National Forest Purchase Aerials', to us in a box. The photographs include most of the Enoree District of the Sumter National Forest, including the entirety of the Calhoun CZO, not just the long-term plots and small watersheds. The photographs were scanned and georectified, then color-balanced and stitched together following 'seams' - high-contrast features such as rivers and roads ('seamlined'). In addition to the main tiff are four files that can be used to properly geolocate the composite image in ArcGIS.

The multilayer pdf file includes a smaller version of the seamlined 1933 aerial photography mosaic raster layer, as well as this aerial mosaic transparent over slope map (for a 3D-like 1933 image raster). Other layers include contours, roads, boundaries, sampling locations, 1.5 m DEM, 1.5m slope, 1m 2013 NAIP aerial imagery, and 2014 canopy height. The pdf file includes both 'interfluve order' and 'landshed order.' These two layers mean the same thing, but the landshed is the area unit around the interfluve that is used for statistics; this dataset has been QC'ed. The Interfluve Order network was used to delineate the landsheds and agrees with it >95% of the time, but has a few inaccuracies (it was automated by the computer) that were fixed manually. Use the network for viewing and considering the landscape at large, but for the specific interfluve order, check the color of the 'Landshed Order' dataset to verify its accuracy.

Date Range Comments: The exact date these photos were taken is unknown, but the year is thought to be 1933.The flight date is prior to the USFS land purchases for the Enoree District of the Sumter National Forest; the photos are thus known as the "pre-purchase photos").

该压缩文件内含一幅由一系列拍摄于1933年的航空照片拼接而成的大型TIFF镶嵌图像，这些照片记录了当时美国林业服务机构（USFS）正在收购的Calhoun CZO区域。美国林业服务机构的考古学家Mike Harmon将被称为“Sumter国家森林购买航空照片”的黑白照片以箱装形式交予我们。这些照片涵盖了Sumter国家森林Enoree区的绝大部分，包括Calhoun CZO的全境，而不仅限于长期监测的样地和小的流域。照片经过扫描、地理校正，随后遵循“拼接线”——如河流和道路等高对比度特征——进行色彩平衡和拼接。除了主要TIFF文件外，还包含四个文件，可用于在ArcGIS中准确定位该复合图像。多层PDF文件包含一个缩小版的1933年拼接线航空摄影镶嵌栅格图层，以及覆盖斜坡的透明航空镶嵌图像（用于3D效果的1933年图像栅格）。其他图层包括等高线、道路、边界、采样点、1.5米DEM、1.5米坡度、1米2013年NAIP航空影像和2014年树冠高度。PDF文件包括“河间地带顺序”和“流域顺序”两个图层。这两个图层含义相同，但流域是围绕河间地带的面积单位，用于统计；该数据集已经过质量控制。使用河间地带顺序网络来划定义流域，且与流域顺序一致超过95%的时间，但存在一些由计算机自动生成的不准确之处（经人工修正）。使用该网络以观看和考虑整体景观，但对于特定的河间地带顺序，请检查“流域顺序”数据集的颜色以验证其准确性。

日期范围注释：这些照片的具体拍摄日期未知，但据推测为1933年。飞行日期早于美国林业服务机构对Sumter国家森林Enoree区的土地收购；因此，这些照片被称为“收购前照片”。