LiDAR Slopes above 20

This data is a polygon representation of the reclassified slope raster derived from the bareearth mosaic of DOGAMI"s mosaic raster and the 2023 OLC Jackson County BE (as reference below), reprojected and transformed to OCRS NAD 83 2011(2010). To reduce the many small areas, the minimum polygon size was set at 2,000 square feet, collapsing any area smaller. The Slope Raster reclass parameters: 20- above percent slope Product: This GIS dataset contains Bare Earth (BE) raster models depicting lidar-derived elevation data for the 2023 OLC Jackson County Lidar project area. Raster models were delivered by AOI mosaic in addition to the 3000ft tiles. Dataset Description: The 2023 OLC Jackson County Lidar project area encompasses 506,952 acres; and is located in Jackson County, Oregon. This project called for the planning, acquisition, processing, and production of derivative products of lidar data and was to be collected at a nominal pulse spacing (NPS) of 8 ppsm - 0.35 meters. Project specifications are based on the U.S. Geological Survey National Geospatial Program Lidar Base Specification, Version 2022 rev. A. The native projection is Oregon Lambert Conic Conformal, units are in International feet. The native horizontal datum is NAD83(2011); the native vertical datum is NAVD88; Geoid 18. Bare earth DEMs were derived from the classified lidar data and delivered within a 3000 ft x 3000 ft tiling schema. Ground Conditions: Lidar was collected between November 14th, 2002 - November 22nd, 2002 and June 28th, 2023 - June 30th, 2023 while no snow was on the ground and the area was free of cloud cover. Using Countwide LiDAR Mosaic, Slope was extracted from the bare earth digital elevation model. Slope was then reclassified to certain slopes. The Slopes above 20 percent grade data was extracted from the Slope Reclassified raster. Then City Limits and Public properties removed. Finally, the data went through a Simplify Polygon with a minimum area of 2000 square feet.本数据集为经重投影与坐标转换至OCRS NAD 83 2011(2010)坐标系的坡栅格重分类结果的多边形表达，该栅格源自DOGAMI裸土镶嵌栅格与2023年OLC杰克逊县裸土（BE）数据集（详见下文）。为减少细碎图斑，将最小多边形保留尺寸设为2000平方英尺，合并所有小于该尺寸的多边形。坡栅格重分类参数：坡度大于20%的区域。 产品说明：本地理信息系统（GIS）数据集包含裸土（BE）栅格模型，该模型呈现了2023年OLC杰克逊县激光雷达（LiDAR）项目区域内由激光雷达反演得到的高程数据。栅格模型除采用3000英尺瓦片分幅外，还按感兴趣区（AOI）进行镶嵌交付。 数据集说明：2023年OLC杰克逊县激光雷达项目区域占地面积达506952英亩，位于俄勒冈州杰克逊县。本项目涵盖激光雷达数据的规划、采集、处理以及衍生产品生产，标称脉冲间距（NPS）为8个脉冲每平方米（ppsm），对应间距为0.35米。项目规范依据《美国地质调查局国家地理空间项目激光雷达基础规范2022修订版A》制定。原生投影坐标系为俄勒冈兰伯特共形圆锥投影，单位为国际英尺。原生水平基准面为NAD83(2011)，原生垂直基准面为NAVD88，采用大地水准面18（Geoid 18）。裸土数字高程模型（DEM）源自分类后的激光雷达数据，以3000英尺×3000英尺瓦片分幅方案交付。 地面采集条件：激光雷达数据采集于2002年11月14日至22日，以及2023年6月28日至30日，采集时段区域无积雪且无云覆盖。采用全县域激光雷达镶嵌图，从裸土数字高程模型中提取坡度信息，随后将坡度重分类为不同等级。从重分类后的坡度栅格中提取坡度大于20%的区域数据，之后移除城市边界与公共用地范围，最终对数据进行多边形简化处理，设定最小保留面积为2000平方英尺。