Two Foot Contour

Data collected between 3/29/17 and 5/3/17. Contours created on 12/13/18. The 1-foot elevation contours were presented as a feature class in an Esri ArcGIS 10.3 File Geodatabase. The contours were derived from Bare-Earth (DEMs) created from QL2 LiDAR data. Source Data Description: MI 2016 LiDAR project called for the Planning, Acquisition, processing and derivative products of LIDAR data to be collected at a nominal pulse spacing (NPS) of 0.7 meter. Project specifications are based on the U.S. Geological Survey National Geospatial Program Base LIDAR Specification, Version 1.2. The data was developed based on a horizontal projection/datum of Michigan State Plane South, NAD83(2011), international feet and vertical datum of NAVD1988 (GEOID12A), international feet. Deliverables included classified LAS, Raw LAS, Bare-Earth hydro-flattened DEMs, Breaklines and Intensity images. Ground Conditions: LiDAR was collected in spring or fall, while no snow was on the ground and rivers were at or below normal levels.本数据集采集于2017年3月29日至2017年5月3日期间，等高线轮廓生成于2018年12月13日。1英尺等高线以要素类形式存储于Esri ArcGIS 10.3文件地理数据库（File Geodatabase）中。该等高线源自基于QL2激光雷达（LiDAR）数据生成的裸地面数字高程模型（Digital Elevation Model，DEM）。 源数据说明：密歇根州2016年激光雷达项目要求完成激光雷达数据的规划、采集、处理及衍生产品生产，设定标称脉冲间距（nominal pulse spacing，NPS）为0.7米。本项目规范依据美国地质调查局国家地理空间项目基础激光雷达规范1.2版（U.S. Geological Survey National Geospatial Program Base LIDAR Specification, Version 1.2）制定。本数据采用的水平投影基准为密歇根州平面坐标系南带（NAD83(2011)），单位为国际英尺；垂直基准为NAVD1988（GEOID12A），单位同样为国际英尺。 本次交付的成果包括分类LAS文件、原始LAS文件、经水文平整的裸地面DEM、断裂线（Breaklines）及强度影像。 数据采集条件：激光雷达数据采集于春季或秋季，此时地面无积雪，河流水位处于正常或低于正常水平。