OC Five 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，等值线于2018年12月13日生成。本数据集包含的1英尺高程等值线以要素类（feature class）形式存储于Esri ArcGIS 10.3文件地理数据库（File Geodatabase）中。该等值线源自基于QL2激光雷达（LiDAR）数据生成的裸地形数字高程模型（DEMs）。 源数据说明：密歇根州2016年激光雷达项目要求开展激光雷达数据的规划、采集、处理及衍生产品生产，其标称脉冲间距（NPS）设定为0.7米。本项目技术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版制定。本数据集基于以下坐标基准构建：平面投影/基准为密歇根州平面坐标南区、北美大地基准1983（NAD83(2011)），单位为国际英尺；垂直基准为北美垂直基准1988（GEOID12A），单位为国际英尺。交付成果包含分类LAS格式数据、原始LAS格式数据、裸地形水文平整数字高程模型、断裂线及强度影像。 采集条件：激光雷达数据采集于春季或秋季，此时地表无积雪，河流水位处于正常或低于正常水位状态。