Pepin_County_Point_Cloud

Metadata:


Identification_Information:
Citation:
Citation_Information:
Publication_Date: Unpublished Material
Publication_Time: Unknown
Title:
Pepin_County_Point_Cloud
Geospatial_Data_Presentation_Form: vector digital data
Publication_Information:
Description:
Abstract:
Ayres Associates provided Pepin County with topographic mapping services in 2013. The LiDAR data was collected on May 8, 2013 using a Riegl sensor mounted in a fixed-wing aircraft. LiDAR data was collected to support FEMA accuracy standards and to support generation of 2-foot contours. The LiDAR data was delivered according to the County's standard section 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 a classified point cloud, bare earth DTM, DEM, contours, breaklines, and intensity images. Waveform data was collected with the Riegl sensor over the project area. The total project area is 250 square miles.
Purpose:
The 2013 Point Cloud files contain the total LiDAR point cloud. This dataset constitutes all classifications of lidar points.
Supplemental_Information:
Point Classes are as follows: 1 = Processed, Unclassified, 2 = Bare Earth Ground, 3 = Low vegetation, 4 = Medium vegetation, 5 = High vegetation, 6 = Building, 7 = Noise, 8 = Res. (Model keypoints), 9 = Water, 10 = Ignored Ground, 11 = Road, 12 = Res. (Overlap), 21 = High Points
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 20130508
Time of Day: unknown
Currentness_Reference:
ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate:
East_Bounding_Coordinate:
North_Bounding_Coordinate:
South_Bounding_Coordinate:
Keywords:
Theme:
Theme_Keyword: lidar
Theme_Keyword: classified
Theme_Keyword: point classes
Place:
Place_Keyword: Pepin
Place_Keyword: County
Place_Keyword: Wisconsin
Access_Constraints: To be determined by client
Use_Constraints:
To be determined by client
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Maria Holl
Contact_Organization: Pepin County Land Management Department
Contact_Position: Director
Contact_Address:
Address:
740 7th Ave. West
City: Durand
State_or_Province: Wisconsin
Postal_Code: 54736
Country: U.S.A.
Contact_Voice_Telephone: 715-672-8897
Contact_Facsimile_Telephone: 715-672-8677
Contact_Electronic_Mail_Address: pepza@co.pepin.wi.us10.9
Hours_of_Service: 8am to 4:30pm, CST
Native_Data_Set_Environment:
Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.3.1.3000
Cross_Reference:
Citation_Information:
Originator: Originator
Publication_Date: Publication_Date
Publication_Information:
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Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
The file parameters of all the data are correct.
Logical_Consistency_Report:
Consistency was maintained throughout the dataset.
Completeness_Report:
The files cover the full extent of the contract.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Vertical_Positional_Accuracy:
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: Ayres Associates
Publication_Date: Unpublished Material
Title:
Pepin_County_LiDAR
Geospatial_Data_Presentation_Form: remote-sensing vector data
Publication_Information:
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: unknown
Source_Currentness_Reference:
ground condition
Source_Contribution:
The LiDAR data was post processed and manually classified to develop the bare earth subset of the raw LiDAR point cloud.
Process_Step:
Process_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 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.
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Ayres Associates
Contact_Address:
Address_Type: mailing and physical address
Address:
5201 E. Terrace Drive, Suite 200
City: Madison
State_or_Province: WI
Postal_Code: 53718
Country: USA
Contact_Voice_Telephone: (608) 443-1200
Contact_Facsimile_Telephone: (608) 443-1250
Hours_of_Service: 8:00am to 5:00pm
Cloud_Cover: 0
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Spatial_Data_Organization_Information:
Indirect_Spatial_Reference_Method:
None
Direct_Spatial_Reference_Method: Point
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Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Map_Projection:
Map_Projection_Name: Lambert Conformal Conic
Lambert_Conformal_Conic:
Standard_Parallel: 44.636149
Longitude_of_Central_Meridian: -92.227778
Latitude_of_Projection_Origin: 44.636149
False_Easting: 550000.000000
False_Northing: 282260.222000
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Planar_Distance_Units: survey feet
Geodetic_Model:
Horizontal_Datum_Name: D_North_American_1983
Ellipsoid_Name: Geodetic Reference System 80
Semi-major_Axis: 6378137.000000000000000000
Denominator_of_Flattening_Ratio: 298.257222101000020000
Vertical_Coordinate_System_Definition:
Altitude_System_Definition:
Altitude_Datum_Name: North American Vertical Datum of 1988
Altitude_Resolution: 1.000000
Altitude_Distance_Units: feet
Altitude_Encoding_Method: Explicit elevation coordinate included with horizontal coordinates
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Entity_and_Attribute_Information:
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Metadata_Reference_Information:
Metadata_Date: 20131223
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Ayres Associates
Contact_Address:
Address_Type: mailing and physical address
City: 5201 E. Terrace Drive, Suite 200
State_or_Province: Madison
Postal_Code: 53718
Country: USA
Contact_Voice_Telephone: (608) 443-1200
Contact_Facsimile_Telephone: (608) 443-1250
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time
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