2020 Contours, Town of Beloit

The Rock County lidar project area covers approximately 771 square miles which includes a 100 meter buffer around the county boundary. The lidar data was acquired at a nominal point spacing (NPS) of 0.7 meters and a single swath nominal point density (NPD) of 2.0. Project specifications are based on Rock County requirements and on the U.S. Geological Survey National Geospatial Program LiDAR Base Specification, Version 2.1. The data was developed based on a horizontal projection/datum of NAD83(2011) / WISCRS Rock (ftUS) (EPSG Code: 7629), and vertical datum of NAVD88 - Geoid12B (Feet). LiDAR data was acquired using a Riegl VQ 1560i sensor with serial number 4040 from April 16, 2020 to April 26, 2020 in 5 total lifts. Acquisition occurred with leaves absent from deciduous trees, when no snow was present on the ground, and with rivers at or below normal levels.罗克县（Rock County）激光雷达（LiDAR）项目区覆盖面积约771平方英里，包含县界周边100米的缓冲区域。本次获取的激光雷达数据标称点间距（Nominal Point Spacing, NPS）为0.7米，单条航带标称点密度（Nominal Point Density, NPD）为2.0。本项目技术规范基于罗克县相关要求及美国地质调查局（U.S. Geological Survey, USGS）国家地理空间计划激光雷达基础规范2.1版制定。数据采用的水平投影基准为NAD83(2011) / WISCRS Rock（英尺美制，EPSG代码：7629），垂直基准为NAVD88 - Geoid12B（英尺）。激光雷达数据采集工作于2020年4月16日至2020年4月26日期间开展，使用序列号为4040的Riegl VQ 1560i传感器完成，共分为5个飞行架次。数据采集时，落叶乔木无叶片覆盖、地面无积雪，且河流水位处于正常或低于正常水平。