Cook County Digital Elevation Model (2022)

The DEM of Cook County was developed from the DEM tiles that were delivered after the 2022 LiDAR acquisition. This DEM assembles all the tiles into one raster. It displays the bare earth returns of the LiDAR in feet as a raster. There were no data values recorded in the Lidar for a small area of the Calumet Shores Gull Island wetland. The lidar is intended to return surface elevation for waterbodies; however in this instance there is a reflectance error. A corrected value for the surface elevation of 579.26 was calculated using a constant value raster. The original 3 tiffs are available (18508225.tif,18508250.tif, 18758250.tif).

库克县（Cook County）数字高程模型（Digital Elevation Model，DEM）由2022年激光雷达（Light Detection and Ranging，LiDAR）采集任务交付的DEM瓦片拼接而成。该DEM将所有瓦片整合为单幅栅格数据，以英尺为单位展示激光雷达采集的裸地回波信息。卡尔梅特海岸鸥岛湿地（Calumet Shores Gull Island wetland）的小片区域未在激光雷达数据中记录到有效数值。激光雷达本应返回水体的地表高程，但此处存在反射误差。研究人员通过恒定值栅格计算得到该区域的地表高程修正值：579.26。原始3个TIFF格式文件（18508225.tif、18508250.tif、18758250.tif）均可获取。