Slope (25 percent)
收藏资源简介：
Areas of land with slopes equal to or greater than 25 percent (approximately 12 degrees), derived from the 2019 Metro Lidar Project bare earth digital elevation model (DEM). The lidar data were acquired by NV5 and processed by GeoTerra, Inc. under contract to Metro. GeoTerra created a 3-foot bare earth DEM meeting USGS Quality Level 1 (QL1) standards with a vertical accuracy of less than or equal to 10 cm RMSE(z). The slope polygons were created by Metro using ArcGIS Pro Spatial Analyst tools and custom ArcPy workflows. The same 2019 DEM used to generate the Contours (two foot interval) and Slope (10 Percent) datasets served as the elevation source, ensuring consistency across all elevation-based layers. Date of last data update: 2019-08-31 This is official RLIS data. Contact Person: Franz Arend franz.arend@oregonmetro.gov 503-797-1742 RLIS Metadata Viewer: https://gis.oregonmetro.gov/rlis-metadata/#/details/3859 RLIS Terms of Use: https://rlisdiscovery.oregonmetro.gov/pages/terms-of-use
本数据集为坡度大于等于25%（约12度）的陆地区域，源自2019年Metro激光雷达项目的裸地数字高程模型（Digital Elevation Model, DEM）。该激光雷达数据由NV5采集，GeoTerra公司根据与Metro签订的合同完成数据处理。GeoTerra制作了符合美国地质调查局（United States Geological Survey, USGS）一级质量标准（Quality Level 1, QL1）的3英尺裸地DEM，其垂直精度的均方根误差（Root Mean Square Error, RMSE）z值≤10厘米。坡度多边形由Metro借助ArcGIS Pro空间分析工具与自定义ArcPy工作流生成。用于生成2英尺间隔等高线数据集与10%坡度数据集的同款2019年DEM被用作高程数据源，确保所有基于高程的图层具备一致性。最后一次数据更新日期：2019-08-31。本数据为官方RLIS数据。联系人：Franz Arend，电子邮箱：franz.arend@oregonmetro.gov，联系电话：503-797-1742。RLIS元数据查看器：https://gis.oregonmetro.gov/rlis-metadata/#/details/3859；RLIS使用条款：https://rlisdiscovery.oregonmetro.gov/pages/terms-of-use
