Most if not all control points were collected at street/road intersections on bare level pavement.
Gps pathfinder office orthometric height series#
To accomplish this, survey-grade Trimble R-8 GPS receivers were used to collect a series of control points located on open areas, free of excessive or significant slope, and at least 5 meters away from any significant terrain break. Task 1 was to provide Vertical Ground Control to support the aerial acquisition and subsequent bare earth model processing. Geographically distinct ground points were surveyed using GPS technology throughout the AOIs to provide support for three distinct tasks. GPS based surveys were utilized to support both processing and testing of LiDAR data within FEMA designated Areas of Interest (AOIs). Header files are in proper LAS format with content as specified by FEMA Procedural Memo No. The terrain data have been confirmed as complete LAS format data files. Survey data have been confirmed to be in proper units, coordinate systems and format. 61 are known to exist within the dataset. No gaps as defined by FEMA Procedural Memo No. The terrain data have been checked for completeness against AOI polygons. Survey data have been checked for completeness, points have been collected in correct vegetation units, and distributed throughout the AOI. Quantitative Value: 0.223 meters, Test that produced the value: Consolidated Vertical Accuracy (CVA) equal to the 95th Percentile confidence level (RMSE x 1.9600) calculated against the bare earth surface in all ground cover classes. See last page of the lidar report for clarity. Quantitative Value: 0.051 meters, Test that produced the value: Calculated RMSEz from 21 RTK bare-earth points. The vertical unit of the data file is in meters with 2-decimal point precision. The survey report of this data set may be viewed in Google Earth at: ĭata Quality Vertical Positional Accuracy:ĭeliverables were tested by for both vertical and horizontal accuracy.
The project report of this data set may be viewed in Google Earth at: The acquisition report of this data set may be viewed in Google Earth at:
The preflight report of this data set may be viewed in Google Earth at: Terrain data is used to represent the topography of a watershed and/or floodplain environment and to extract useful information for hydraulic and hydrologic models.Ī footprint of this data set may be viewed in Google Earth at:
Provide high resolution terrain elevation and land cover elevation data. The LiDAR processing product consists of LAS points which are fully classified with the bare earth points tested via the independent QC to ensure the ground surface is accurately represented. The LiDAR Point Cloud product consists of tiles of LAS points which are partially classified such that the bare earth points can be calibrated to the ground surface and tested via the independent QC to ensure the ground surface is accurately represented. LiDAR acquisition products include Pre- and Post- flight reports which contain information on the flightlines, equipment parameters, and other pertinent acquisition details. QA/QC checkpoints, (FVA and CVA - see Ground Control process step for further information) also collected throughout the AOI, are used for independent quality checks of the processed LiDAR data. Ground Control is collected throughout the AOI for use in the processing of LiDAR data to ensure data accurately represents the ground surface. The Ozaukee AOI consists of one area encompassing the entire county.
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