Mecklenburg County, NC bare earth LiDAR masspoints dataset (2007)

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: Kucera International Inc.
Publication_Date: Unknown
Title:
Mecklenburg County, NC bare earth LiDAR masspoints dataset (2007)
Edition: 1.0
Geospatial_Data_Presentation_Form: LiDAR LAS 1.0 Binary file format of vector points
Publication_Information:
Publication_Place: Charlotte, Mecklenburg County, North Carolina
Publisher: Mecklenburg County GIS
Description:
Abstract:
This metadata document describes the LAS file containing 'bald earth' classification of LiDAR data masspoints collected by Kucera covering the project area of the County of Mecklenburg, NC.
Purpose:
The masspoints file depicts the 'bald earth' within the project area. All points not specifically derived from the terrain are removed (tree canopy, buildings, etc.). As such, the file is useful for a variety of applications, such as aiding in contour generation and the production of orthophotos.
Supplemental_Information:
This LiDAR point dataset is stored in a binary file format (LAS 1.0) specific to LiDAR data and includes all headers and attributes needed to create an ASCII or vector point file for use in a GIS. Headers and attributes are described in the 'Entities and Attributes' section in this metadata file. This dataset is partitioned into 5000' x 5000' tiles and the bounding coordinates in this file are for the project area extent, which is Mecklenburg county. The RAW point spacing of the LIDAR data is about 2 points per square meter, or an average spacing of 1.4M between any two neighbor points.
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 20070224
Currentness_Reference: Ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: Unknown
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -81.056139
East_Bounding_Coordinate: -80.556228
North_Bounding_Coordinate: 35.520150
South_Bounding_Coordinate: 34.998219
Keywords:
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: digital terrain model
Theme_Keyword: LiDAR
Theme_Keyword: mapping
Theme_Keyword: mass points
Theme_Keyword: topographic
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: City of Charlotte
Place_Keyword: Cornelius
Place_Keyword: Davidson
Place_Keyword: Huntersville
Place_Keyword: Matthews
Place_Keyword: Mecklenburg County
Place_Keyword: Mint Hill
Place_Keyword: North Carolina
Place_Keyword: Pineville
Access_Constraints: Unknown
Use_Constraints: Unknown
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Andy Goretti
Contact_Organization: Mecklenburg County GIS - Mapping
Contact_Position: Mapping Division Manager
Contact_Address:
Address_Type: mailing and physical
Address: 700 N. Tryon Street
City: Charlotte
State_or_Province: NC
Postal_Code: 28202
Country: U.S.
Contact_Voice_Telephone: 704.336.6192
Contact_Facsimile_Telephone: 704.336.7333
Contact_Electronic_Mail_Address: Andy.Goretti@MecklenburgCountyNC.Gov
Hours_of_Service: 0800-1700 M-F EST
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
Attribute accuracy is tested in the LiDAR processing stage. After classification of the LiDAR data, the 'bald earth' point class is compared to ground control collected within the project area.
Logical_Consistency_Report:
Data was filtered using automated procedures followed by a manual review of the completed data set.
Completeness_Report:
LiDAR data is collected within the project area, processed and verified against control. The bare earth surface will contain voids where insufficient energy was reflected from the surface to generate a valid return from the terrain.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
Horizontal positional accuracy for LiDAR is dependent upon the quality of the GPS/INS solution, sensor calibration and ground conditions at the time of data capture. The horizontal accuracy test had a RMSE 1'.
Quantitative_Horizontal_Positional_Accuracy_Assessment:
Horizontal_Positional_Accuracy_Value: 3.28'
Horizontal_Positional_Accuracy_Explanation:
This value is computed by comparing controls to an intensity based image derived from the classified LiDAR data and represents the RMSE of residuals on controls within the project area.
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
Horizontal positional accuracy for LiDAR is dependent upon the quality of the GPS/INS solution, sensor calibration and ground conditions at the time of data capture. The vertical accuracy was tested with a result of a RMSE 0.58'.
Quantitative_Vertical_Positional_Accuracy_Assessment:
Vertical_Positional_Accuracy_Value: 0.58'
Vertical_Positional_Accuracy_Explanation:
This value is computed by comparing controls to the classified LiDAR ground surface and represents the RMSE of residuals on controls within the project area.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: Kucera International Inc.
Publication_Date: Unpublished material
Title: LiDAR Data
Edition: 1.0
Geospatial_Data_Presentation_Form: Vector digital data
Publication_Information:
Publication_Place: None
Publisher: None
Type_of_Source_Media: disc
Source_Time_Period_of_Content:
Time_Period_Information:
Multiple_Dates/Times:
Single_Date/Time:
Calendar_Date: 20070224
Single_Date/Time:
Calendar_Date: 20070214
Single_Date/Time:
Calendar_Date: 20070212
Source_Currentness_Reference: Ground condition
Source_Citation_Abbreviation: LIDAR
Source_Contribution:
LiDAR data was recorded for the project area to aid in contour generation.
Source_Information:
Source_Citation:
Citation_Information:
Originator: Independent Mapping Consultants (IMC)
Publication_Date: Unpublished material
Title: Ground control
Edition: 1.0
Geospatial_Data_Presentation_Form: Vector digital data
Publication_Information:
Publication_Place: None
Publisher: None
Type_of_Source_Media: disc
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 200702
Source_Currentness_Reference: Ground condition
Source_Citation_Abbreviation: CONT
Source_Contribution:
Targeted ground control is used to create a digital control file and control report as well as QC check of LiDAR accuracy. Predefined points (usually NGS) within the project area are targeted. 30 control points were utilized.
Process_Step:
Process_Description:
At selected locations throughout the site, accurate GPS coordinates and elevations are surveyed and the points are marked with targets.
Source_Used_Citation_Abbreviation: None
Process_Date: 200702
Source_Produced_Citation_Abbreviation: CONT
Process_Step:
Process_Description:
New LiDAR data is captured for the project area using a Leica ALS50 LiDAR instrument in conjunction with a POSAV Applanix GPS/INS system mounted within a Piper Navajo twin prop airplane. Base-station receivers are operated on the ground over known site points during the flyover to provide data necessary to reference the instrument position and orientation measurements to the terrain coordinate system. Altitude of flight was 5500' above mean terrain (AMT).
Source_Used_Citation_Abbreviation: None
Process_Date: 200702
Source_Produced_Citation_Abbreviation: LIDAR
Process_Step:
Process_Description:
The airborne GPS/INS data is processed, in both forward and reverse directions, together with the simultaneously recorded ground-based GPS base station data to determine the LiDAR sensor's angle and orientation in the terrain (project) coordinate datum during the survey.
Source_Used_Citation_Abbreviation: GPS_RAW
Process_Date: 2007
Source_Produced_Citation_Abbreviation: GPS_SOL
Process_Step:
Process_Description:
LiDAR data is processed using the GPS/INS solution. Data is classified to produce a 'bald earth' surface and output to a LAS binary file format.
Source_Used_Citation_Abbreviation: CONT, GPS_SOL, LIDAR
Process_Date: 2007
Source_Produced_Citation_Abbreviation: LAS
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Entity point
Point_and_Vector_Object_Count: []
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Grid_Coordinate_System:
Grid_Coordinate_System_Name: State Plane Coordinate System 1983
State_Plane_Coordinate_System:
SPCS_Zone_Identifier: 3200 North Carolina
Lambert_Conformal_Conic:
Standard_Parallel: 34.333333
Standard_Parallel: 36.166667
Longitude_of_Central_Meridian: -79.000000
Latitude_of_Projection_Origin: 33.750000
False_Easting: 2000000.0
False_Northing: 0.000000
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: Coordinate pair
Coordinate_Representation:
Abscissa_Resolution: .01
Ordinate_Resolution: .01
Planar_Distance_Units: U.S. Feet
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1983
Ellipsoid_Name: Geodetic Reference System 80
Semi-major_Axis: 6378137.0
Denominator_of_Flattening_Ratio: 298.25722210088
Vertical_Coordinate_System_Definition:
Altitude_System_Definition:
Altitude_Datum_Name: North American Vertical Datum of 1988
Altitude_Resolution: .01
Altitude_Distance_Units: U.S. Feet
Altitude_Encoding_Method:
Explicit elevation coordinate included with horizontal coordinates
Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: LiDAR masspoints
Entity_Type_Definition: ground points collected from LiDAR survey
Entity_Type_Definition_Source: Kucera International Inc.
Attribute:
Attribute_Label: CLASS
Attribute_Definition:
Data is filtered and classified into categories in which the data falls. Standard is: 1-default 2-ground 3-low veg 4-med. Veg 5-high veg 6-building 7-low point 8-model key point.
Attribute_Definition_Source: Kucera International Inc.
Attribute:
Attribute_Label: ECHO
Attribute_Definition:
The ALS50 has the potential for 4 returns per pulse. First, second, third, and last return.
Attribute_Definition_Source: Kucera International Inc.
Attribute:
Attribute_Label: INTENSITY
Attribute_Definition:
Each return has an "intensity" value attributed to it, based on the brightness of the return. It is 8 bit, so the brightest return will have an intensity value of 255, the darkest a value of 0.
Attribute_Definition_Source: Kucera International Inc.
Attribute:
Attribute_Label: FLIGHT LINE NUMBER
Attribute_Definition:
Each line flown in a mission is assigned a unique number. A flight line is defined as the time between activated recording and deactivated recording.
Attribute_Definition_Source: Kucera International Inc.
Attribute:
Attribute_Label: TIME TAG
Attribute_Definition:
Each return is tagged with the current gps time in seconds of the week.
Attribute_Definition_Source: Kucera International Inc.
Overview_Description:
Entity_and_Attribute_Overview: None
Entity_and_Attribute_Detail_Citation: None
Distribution_Information:
Distributor:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Andy Goretti
Contact_Organization: Mecklenburg County GIS - Mapping
Contact_Position: Mapping Division Manager
Contact_Address:
Address_Type: mailing and physical
Address: 700 N. Tryon Street
City: Charlotte
State_or_Province: NC
Postal_Code: 28202
Country: U.S.
Contact_Voice_Telephone: 704.336.6192
Contact_Facsimile_Telephone: 704.336.7333
Contact_Electronic_Mail_Address: Andy.Goretti@MecklenburgCountyNC.Gov
Hours_of_Service: 0800-1700 M-F EST
Resource_Description:
Mecklenburg County, NC bare earth LiDAR masspoints dataset (2007)
Distribution_Liability:
Mecklenburg County GIS provides the geographic data "as is". This organization makes no guarantee or warranty concerning the accuracy of information contained in the geographic data. Also, this organization makes no warranty, either expressed or implied, regarding the condition of the product or its fitness for any particular purpose. The burden for determining fitness for use lies entirely with the user. Although these files have been processed successfully on computers at this organization, no warranty is made by this organization regarding the use of these data on any other system, nor does the fact of distribution constitute or imply such a warranty.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: unknown
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: <http://emaps.charmeck.org>
Offline_Option:
Offline_Media: CD, DVD, USB Hard Drive, and FTP Download
Recording_Capacity:
Recording_Density: 0.7, 4.4
Recording_Density_Units: GB
Recording_Format: Unknown
Fees: unknown
Ordering_Instructions: Contact Mecklenburg County GIS, or visit the website
Custom_Order_Process: Contact Mecklenburg County GIS, or visit the website
Technical_Prerequisites: PC with CDROM or DVD drive
Available_Time_Period:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 200709
Metadata_Reference_Information:
Metadata_Date: 200710
Metadata_Review_Date: 200710
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Andy Goretti
Contact_Organization: Mecklenburg County GIS - Mapping
Contact_Position: Mapping Division Manager
Contact_Address:
Address_Type: mailing and physical
Address: 700 N. Tryon Street
City: Charlotte
State_or_Province: NC
Postal_Code: 28202
Country: U.S.
Contact_Voice_Telephone: 704.336.6192
Contact_Facsimile_Telephone: 704.336.7333
Contact_Electronic_Mail_Address: Andy.Goretti@MecklenburgCountyNC.Gov
Hours_of_Service: 0800-1700 M-F EST
Metadata_Standard_Name: FGDC CSDGM
Metadata_Standard_Version: FGDC-STD-001-1998
Generated by mp version 2.9.1 on Wed Oct 03 07:52:47 2007