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LiDAR DEM Wood County, WI 2015
- Identification Information
- Spatial Reference Information
- Data Quality Information
- Distribution Information
- Metadata Reference Information
Identification Information
- Citation
- Title
- LiDAR DEM Wood County, WI 2015
- Originator
- Wood County
- Creation Date
- 2015-03-31
- Geospatial Data Presentation Form
- imageDigital
- Abstract
- Ayres Associates provided Wood County, Wisconsin, with lidar based topographic mapping services in the spring of 2015 as part of WROC. The LiDAR data was collected from 20150321 to 20150331 using an Optech Orion H300 sensor mounted in a fixed-wing aircraft. LiDAR data was collected to support the generation of 2-foot contours to meet FEMA vertical accuracy standards. The LiDAR data was delivered according to a 5,000 foot x 5,000 foot tile schematic. The LiDAR data was calibrated using information collected at the time of flight from GPS base stations on the ground and airborne GPS/IMU in the aircraft. The calibrated LiDAR data was processed to produce a classified point cloud, bare earth DTM, DEM, DSM, contours, breaklines, and intensity images.
- Purpose
- LiDAR was acquired to produce an accurate bare earth surface and to generate 2-ft contours to support county land information efforts.
- Supplemental Information
- LiDAR tile index can be found by visiting the Wood County LiDAR and Orthophoto Data Distribution App: http://woodwi.maps.arcgis.com/home/index.html
- Temporal Extent
- Currentness Reference
- [The period extent begins at date of data acquisition and is completed upon date delivery of data to Wood County.]
- Time Instant
- 2015-03-31T00:00:00
- Bounding Box
- West
- -90.358992
- East
- -89.841705
- North
- 44.787738
- South
- 44.512662
- Bounding Box
- West
- -90.358992
- East
- -89.841705
- North
- 44.787738
- South
- 44.512662
- ISO Topic Category
- elevation
- imageryBaseMapsEarthCover
- Place Keyword
- Wood County
-
Wisconsin
- Place Keyword Thesaurus
- GNIS
- Theme Keyword
-
Raster
- Theme Keyword Thesaurus
- FGDC
- Theme Keyword
- DEM
- GRID
- surface model
- surface data
- terrain data
- bare earth
- raster data
-
3.125-foot pixel
- Theme Keyword Thesaurus
- Status
- completed
- Maintenance and Update Frequency
- notPlanned
- Language
- eng
- Credit
- Wood County
- Point of Contact
- Contact
- Justin Conner
- Position Name
- Land Records Coordinator
- Delivery Point
- 400 Market St.
- City
- Wisconsin Rapids
- Administrative Area
- Wisconsin
- Postal Code
- 54495
- Country
- US
- jconner@co.wood.wi.us
- Phone
- 715-421-8469
Spatial Reference Information
- Reference System Identifier
- Code
- 7645
- Code Space
- EPSG
- Version
- 9.0.1
Data Quality Information
- Lineage
- Process Step
- Description
- LiDAR processing utilizes several software packages, including GeoCue and the TerraSolid suite of processing components. The GeoCue software is a database management system for housing the LiDAR dataset (usually multiple gigabytes in size). GeoCue incorporates a thorough checklist of processing steps and quality assurance/quality control (QA/QC) procedures that assist in the LiDAR workflow. The TerraSolid software suite is used to automate the initial classification of the LiDAR point cloud based on a set of predetermined parameters. Lidar technicians refer to ground cover research (natural and cultural features) within the project area and determine algorithms most suitable for the initial automated LiDAR classification. (Some algorithms/filters recognize the ground in forests well, while others have greater capability in urban areas). During this process each point is given an initial classification (e.g., as ground, vegetation, or noise) based on the point's coordinates and the relation to its neighbors. Classifications to be assigned include all those outlined by ASPRS standards. The initial classifications produce a coarse and inexact dataset, but offer an adequate starting point for the subsequent manual classification procedure. During this step, "overlap" points are automatically classified (those originating from neighboring flightlines) using information gathered from the ABGPS and IMU data. Any duplicate points existing from adjacent flightlines are removed during this process. Hydrographic breaklines are collected using LiDARgrammetry to ensure hydroflattened water surfaces. This process involves manipulating the LiDAR data's intensity information to create a metrically sound stereo environment. From this generated "imagery", breaklines are photogrammetrically compiled. Breakline polygons are created to represent open water bodies. The LiDAR points that fall within these areas are classified as "water." Breaklines representing streams and rivers shall be smooth, continuous, and monotonic, and represent the water surface without any stair steps except for dams and rapids. All hydrographic breaklines include a 1.5 foot buffer, with the points being re-classified as Class 10 (ignored ground). TerraSolid is further used for the subsequent manual classification of the LiDAR points allowing technicians to view the point cloud in a number of ways to ensure accuracy and consistency of points and uniformity of point coverage. The TIN was processed to create a GRID or digital elevation model (DEM) with 3.125-foot pixels.
Distribution Information
- Format Name
- Raster Dataset
- Distributor
- Wood County
- Online Access
- http://lidar.woodcogis.com/
- Protocol
- WWW:DOWNLOAD-1.0-ftp—download
- Name
- Wood County ftp access
- Function
- download
- Online Access
- http://woodwi.maps.arcgis.com/home/index.html
- Protocol
- WWW:LINK-1.0-http--link
- Name
- Wood County GIS site
- Function
- information
Metadata Reference Information
- Hierarchy Level
- dataset
- Metadata File Identifier
- C4070917-5B1E-4C67-99E5-7EC8330491EA
- Metadata Date Stamp
- 2017-04-19
- Metadata Standard Name
- ISO 19139 Geographic Information - Metadata - Implementation Specification
- Metadata Standard Version
- 2007
- Character Set
- utf8