begrid

Metadata:

• Identification_Information
• Data_Quality_Information
• Metadata_Reference_Information
• Distribution_Information
• Spatial_Data_Organization_Information
• Spatial_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Online_Linkage: \\CRAIG\C$\CraigGisFiles\BeVegPaper\begrid

Originator: Craig E. Tweedie

Publication_Date: August 2010

Title: begrid

Geospatial_Data_Presentation_Form: raster digital data

Native_Data_Set_Environment:

Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.2.6.1500

Description:

Abstract:

This is a Digital Elevation Model (DEM) of the Barrow Biocomplexity study area.Light detection and Ranging (LIDAR) data were acquired by AeroMetric (<http://www.aerometric.com/>) on October 4th 2005 at an altitude of approximately 600 meters above mean terrain using an Optech 70 kHz Airborne Laser Terrain Mapper (ALTM 30/70) on board a twin engine Cesna 310 aircraft. The system was configured with a differential global positioning system (DGPS) and a 200 Hz intertial measurements system (IMU) that were used to improve the accuracy of ground data. LIDAR data were processed by PND Engineers Inc. (<http://www.pndengineers.com/index.aspx>). Data were post-processed utilizing Optech's REALM software, which first computes a 2 Hz Post Processed Kinematic (PPK) DGPS trajectory, then integrates the IMU data for a final smoothed best estimate of trajectory (SBET). SBET data were then integrated with the LIDAR pulse data, for a final x, y, z "point cloud" dataset in the industry standard '.LAS' format in the WGS 84, Universal Transverse Mercator (UTM), Zone 4, Meters coordinate system with ellipsoidal heights. These data required a vertical datum adjustment to transform the vertical datum from ellipsoidal heights to the Alaska Geoid 99 orthometric height using an 'in-house' software package 'LIDAR Tools' at PND Engineers Inc. Following post-processing in TerraSolid's 'TMatch' software that corrected data for Heading, Roll, Pitch and Mirror scale data were then "classified" using TerraSolid's 'TerraScan' software. Classification of the 'bare earth was performed by running algorithms in Terrascan that re-classify the 'last return' data to a 'bare earth' classification, which were output to a comma delimited "Point Cloud" ASCII format. Calibration reports for this system typically report a horizontal and vertical accuracy of 0.30 and 0.15 meters respectively and a point spacing of approximately 0.60 meters. Data were quality checked in late August 2006 by Siebert and Associates (<http://seibert-ak.com/gps>). This survey (n = 286 points) indicated a systematic error of -0.143 meters, which was used to correct the LIDAR point cloud data in TerraScan. Resulting data show a mean difference between LIDAR and ground based data of 0.003 meters (median = 0.004, RMSE = 0.043 meters). The Digital Elevation Model was derived by importing the final LIDAR x, y, z point cloud into ArcGIS (version 9.2) and creating a full resolution TIN and exporting this to a 1 meter raster layer using a linear interpolation method.

Purpose:

Derive a surface model for terrain, hydrological, and microtopographic modeling

Time_Period_of_Content:

Currentness_Reference: September 2006

Time_Period_Information:

Single_Date/Time:

Calendar_Date: unknown

Status:

Progress: Complete

Maintenance_and_Update_Frequency: As needed

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate:

REQUIRED: Western-most coordinate of the limit of coverage expressed in longitude.

East_Bounding_Coordinate:

REQUIRED: Eastern-most coordinate of the limit of coverage expressed in longitude.

North_Bounding_Coordinate:

REQUIRED: Northern-most coordinate of the limit of coverage expressed in latitude.

South_Bounding_Coordinate:

REQUIRED: Southern-most coordinate of the limit of coverage expressed in latitude.

Keywords:

Theme:

Theme_Keyword_Thesaurus: DEM

Theme_Keyword: digital elevation model

Access_Constraints: Open access

Use_Constraints:

Users can utilize this data for their own use but publication will require the permission of the author (ctweedie@utep.edu).

Point_of_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Dr Craig E. Tweedie

Contact_Organization: University of texas at El Paso

Contact_Position: Asst. Prof.

Contact_Address:

Address_Type: mailing address

Address: UTEP, 500 W. University Dr, Biology Building

City: El Paso

State_or_Province: Texas

Postal_Code: 79968

Country: USA

Contact_Voice_Telephone: 916 747 8448

Contact_Electronic_Mail_Address: ctweedie@utep.edu

Cross_Reference:

Citation_Information:

Series_Information:

Series_Name: UTEP Biocomplexity Data

Issue_Identification: July 2010

Publication_Information:

Publication_Place: UTEP, El Paso, TX

Publisher: Dr Craig E. Tweedie

Data_Set_Credit: Contact ctweedie@utep.edu

Data_Quality_Information:

Lineage:

Process_Step:

Process_Description: Dataset copied.

Source_Used_Citation_Abbreviation:

C:\CraigGisFiles\Biocomplexity\LidarPnd\lidar\Lidar_Data\XyzTextFiles\tingrid2

Time_of_Day: 21454000

Process_Step:

Process_Description: Dataset copied.

Source_Used_Citation_Abbreviation:

C:\CraigGisFiles\Biocomplexity\LidarPnd\lidar\Lidar_Data\GriddedDem\begrid

Time_of_Day: 06535100

Process_Step:

Process_Description: Dataset copied.

Source_Used_Citation_Abbreviation:

C:\CraigGisFiles\Biocomplexity\SnowWaterEquivelentPlan2006\begrid

Time_of_Day: 12374400

Metadata_Reference_Information:

Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998

Metadata_Time_Convention: local time

Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Person: REQUIRED: The person responsible for the metadata information.

Contact_Organization:

REQUIRED: The organization responsible for the metadata information.

Contact_Address:

Address_Type:

REQUIRED: The mailing and/or physical address for the organization or individual.

City: REQUIRED: The city of the address.

State_or_Province: REQUIRED: The state or province of the address.

Postal_Code: REQUIRED: The ZIP or other postal code of the address.

Contact_Voice_Telephone:

REQUIRED: The telephone number by which individuals can speak to the organization or individual.

Metadata_Date: 20100728

Metadata_Extensions:

Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>

Profile_Name: ESRI Metadata Profile

Distribution_Information:

Resource_Description: Downloadable Data

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Transfer_Size: 24.420

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Raster

Raster_Object_Information:

Raster_Object_Type: Grid Cell

Row_Count: 2493

Column_Count: 2540

Vertical_Count: 1

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: row and column

Coordinate_Representation:

Abscissa_Resolution: 1.000000

Ordinate_Resolution: 1.000000