LiDAR-derived, DEM - USGS/USACE/ MRCOG 2010 Regional LiDAR Project

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Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: Bohannan-Huston, Inc.
Publication_Date: 20110114
Title:
LiDAR-derived, DEM - USGS/USACE/ MRCOG 2010 Regional LiDAR Project
Edition: MRCOG Regional: NED
Geospatial_Data_Presentation_Form: raster digital data
Publication_Information:
Publication_Place: 809 Copper Ave., NW, Albuquerque, NM 87102
Publisher: Mid Region Council of Governments
Larger_Work_Citation:
Citation_Information:
Originator: Bohannan-Huston, Inc.
Publication_Date: 20110114
Title:
LiDAR-derived, DEM - USGS/USACE/ MRCOG 2010 Regional LiDAR Project
Description:
Abstract:
This Digital Elevation Model (DEM) dataset provides LiDAR-derived elevation data with supplemental stereo photogrammetric break line collection for Digital Terrain Model (DTM) development. A DEM is a continuous surface of elevation information stored in regularly gridded (32-bit floating point) raster format (GeoTIFF) where each grid cell represents the elevation at that specific cell location. There are 5,320 DEM data tiles (organized in a modified Public Land Survey System (PLSS)) established for the 2010 Mid-Region Council of Governments (MRCOG) Orthophotography Project. The LiDAR project area encompasses approximately 1337 square miles in the Rio Grande valley floodplain and surrounding areas in Bernalillo, Sandoval, Socorro and Valencia counties, New Mexico. Each MRCOG data tile is approximately 0.25 square miles in size. Additional elevation data covering approximately 20 square miles contiguous to but outside the boundaries of the MRCOG 2010 Orthophotography coverage area are tiled according to a custom tiling scheme. Those data follow the same elevation production workflow described herein with the exception that they could not be verified against 2010 aerial photography.
Purpose:
Aerial Light Detection and Ranging (LiDAR) data acquisition and processing formed the primary source for elevation data development supporting 2-foot equivalent contour interval Digital Terrain Model (DTM) data and related topographic / elevation information. The DTM data have also been “hydro-flattened” with break line supplementation. LiDAR-derived bare-earth DTM data are georegistered according to project control specifications established for the 2010 Mid-Region Council of Governments (MRCOG) Orthophotography Project: NM State Plane Central Zone (3002) NAD83(HARN), NAVD88, US Survey Foot, Geoid 09. Elevation data covering approximately 1,337 square miles in the Rio Grande valley floodplain and surrounding areas in Bernalillo, Sandoval, Socorro and Valencia counties, New Mexico, were developed with the objective of acquiring regional high-resolution elevation data suitable for input into the National Elevation Dataset (NED) at 1/9 arc second resolution. The regional LlDAR data provide a large area of elevation data for the NED of the greater Albuquerque metropolitan area. The topographic surface data may support a variety of local government applications for land use planning, infrastructure development, environmental resource assessment, alternative energy suitability analyses, and 3D visualization and analysis.
Supplemental_Information:
The bounding rectangle provided within the Geographic Extent metadata section represent the Project Area in which the Digital Terrain Model (DTM) surface elevation data for this Project is located. This Project developed deliverable data derived from the integration of multiple sources of elevation information including: LiDAR data and supplemental break lines collected from Intergraph DMC® stereo digital photography captured as part of the Digital Ortho-photography Project 2010. Deliverables include Point_Cloud (las) format of raw LiDAR points and LiDAR-derived, tiled, "bare earth" DTM data deliverables across the Project including the following data: - Point_Cloud_Classified (las) format of classified LiDAR points, and Bare-Earth_DTM data including: - DEM (32-bit GeoTIFF) format at 3.0 foot grid resolution; - ArcGIS line Shapefile format for DTM Breaklines
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20100312
Ending_Date: 20101116
Currentness_Reference: ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: As needed
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -106.964037
East_Bounding_Coordinate: -106.300992
North_Bounding_Coordinate: 35.639582
South_Bounding_Coordinate: 34.498775
Keywords:
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: Elevation
Theme_Keyword: LiDAR
Theme_Keyword: Relief
Theme_Keyword: New Mexico State Plane
Theme_Keyword: Digital Terrain Model
Theme_Keyword: Digital Orthophoto
Theme_Keyword: TIN
Theme_Keyword: U.S. Public Land Survey System
Theme_Keyword: Raster
Place:
Place_Keyword_Thesaurus:
<http://www.getty.edu/research/conducting_research/vocabularies/tgn/?find=New+Mexico&place=&nation=&prev_page=1&english=Y>
Place_Keyword: Bernalillo County
Place_Keyword: Sandoval County
Place_Keyword: Socorro County
Place_Keyword: Valencia County
Place_Keyword: New Mexico
Place_Keyword: United States of America
Place_Keyword: North America
Access_Constraints:
Access constraints: Please contact the Mid-Region Council of Governments (MRCOG) regarding access to these data at: 505-247-1750
Use_Constraints:
Use constraints: Please contact the Mid Region Council of Governments regarding acknowledgement and any other requirements pertaining to the use these data. Usage of these data should not take the place of ground surveys for more (temporally and/or spatially) detailed requirements.
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Mid Region Council of Governments
Contact_Position: GIS Analyst/Cartographer
Contact_Voice_Telephone: 505.247.1750
Contact_Facsimile_Telephone: 505.247.1753
Contact_Electronic_Mail_Address: cearp@mrcog-nm.gov
Hours_of_Service: 8-5 M-F MT
Contact_Address:
Address_Type: mailing address
Address: 809 Copper Ave., NW,
City: Albuquerque
State_or_Province: NM
Postal_Code: NM
Data_Set_Credit:
Funding for this Project was assembled under a collaborative effort among the Mid-Region Council of Governments (MRCOG), the US Army Corps of Engineers – Albuquerque District (USACE), and the US Geological Survey (USGS). Acknowledgements of the MRCOG, USACE, USGS and Bohannan-Huston, Inc. would be appreciated for products derived from these data.

Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
DTM data were compiled to meet one-foot (1') and two-foot (2’) contour interval data-vertical accuracy at the 95% confidence level (RMSE of 0.33 and 0.67 feet respectively). Ninety-five percent of well-defined features are expected to be within 1.3 ft or 40 cm of their true vertical position on the ground. The horizontal accuracy limits for well-defined points of are expected to be consistent with control defined for the 2010 MRCOG Orthophotography Project within at least 2’ feet (ASPRS Class 1 Mapping Standards for 1"= 200') of their true coordinates.
Logical_Consistency_Report:
DTM features in this data set were collected from a variety of active and passive remote sensing technologies including LiDAR (Light Detection and Ranging) and large scale aerial photography utilizing stereo photogrammetric break line collection. Stereo 3D breakline collection and surface treatment included primarily drainage ditches guided by The Middle Rio Grande Conservancy District (MRGCD) facilities network reference data. Areas of concentrated breakline work also included Levee and River features as well as Road and Railroad features and Bridges on major infrastructure intersecting the Rio Grande River.
Completeness_Report:
Deliverable data tiles were inspected to ensure complete terrain data coverage within tiles and therefore tiles may be comprised of multiple data sources including both classified LiDAR point data and stereo photogrammetrically collected breaklines. Sources covering the Project Areas are defined by Source Information collected from ground survey as well as aerial remote sensing (Digital Aerial Image and LiDAR) data collection in 2010.
Positional_Accuracy:
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report: Tested 0.56 feet vertical accuracy at 95% confidence level
Quantitative_Vertical_Positional_Accuracy_Assessment:
Vertical_Positional_Accuracy_Value: 0.56
Vertical_Positional_Accuracy_Explanation:
DTM data were tested with more than 680 points according to NSSDA testing methodology (<http://www.fgdc.gov/standards/projects/FGDC-standards-projects/accuracy/part3>), utilizing primary photo control from the Digital Orthophotography Project 2010 as well as City of Albuquerque Control. Control points used to test project vertical accuracy should be categorized as "well-defined" points; however, these points were not individually evaluated for this criterion. Control points were also analyzed to assess spatial distribution over the Project area. Control was draped on the final elevation surface model to calculate the difference in elevation values between the DTM surface and the vertical control points used to test the DTM data. Elevation values of the independent and the test points were transferred to the Federal Geographic Data Committee (FGDC) Vertical accuracy calculation spreadsheet to develop the project RMSE and NSSDA vertical accuracy statistics. Reported accuracies are developed from total of 688 points with vertical differences, ranging between -0.5 and +0.5.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: Bohannan-Huston, Inc.
Publication_Date: 20100526
Title: Control Surveying Report for 2010 MRCOG ORTHOPHOTOGRAPHY
Geospatial_Data_Presentation_Form: document
Publication_Information:
Publication_Place: 7500 Jefferson St. NE, Courtyard I, Albuquerque, NM 87109
Publisher: Robert Lockman, P.S. #18331
Type_of_Source_Media: disc
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 20100526
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: MRCOG2010 Orthophotography Final Control Report.pdf
Source_Contribution:
Geodetic control was established through the Project Area to provide a primary control network for Orthophotography and LIDAR mapping in the Project Coordinate System: NM State Plane, Central Zone NAD 1983 (1992)/HARN, North American Vertical Datum of 1988 (NAVD88), U.S. Survey Feet, Geoid 09.
Source_Information:
Source_Citation:
Citation_Information:
Originator: Surdex Corporation
Publication_Date: 20110114
Title: LiDAR Aerial Acquisition - Leica Geosystems ALS50II
Publication_Information:
Publication_Place: 520 Spirit of St. Louis Blvd., Chesterfield, MO 63005
Publisher: Surdex Corporation
Type_of_Source_Media: disc
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20100312
Ending_Date: 20101116
Source_Currentness_Reference: ground condition
Source_Citation_Abbreviation: Flight_Swath_Regional_NED.shp
Source_Contribution:
LIDAR data was captured using a Leica Geosystems ALS50II LIDAR system mounted with an inertial measurement unit (IMU) and dual frequency GPS receiver. Primary project acquisition with this LiDAR sensor occurred between on ten dates: 3/12/2010, 3/13/2010, 3/16/2010, 4/27/2010, 4/28/2010, 5/1/2010, 5/3/2010, 5/4/2010, 5/6/2010, 11/16/2010. During data acquisition, a base station GPS receiver established and collected phase GPS data simultaneous to airborne LiDAR collection performed according to planned LiDAR Flight Parameters.
Source_Information:
Source_Citation:
Citation_Information:
Originator: Surdex Corporation
Publication_Date: Unknown
Title: Digital Aerial Imagery - Intergraph DMC®
Type_of_Source_Media: disc
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20100313
Ending_Date: 20100427
Source_Currentness_Reference: ground condition
Source_Citation_Abbreviation: MRCOG2010_Aerial_Photo_Flight_Index.shp
Source_Contribution:
Digital aerial imagery was collected at a nominal average altitude of 5,700 feet above mean terrain (AMT) using the Intergraph Digital Mapping Camera (DMC®) (120 mm focal length). Designed for capture of a 6-inch pixel nominal ground sample distance (GSD) image, the DMC aerial imagery served the dual purpose of supporting both 0.50 foot GSD resolution digital orthorectification as well as 3D stereo review and break line supplementation of LiDAR-Derived “Bare Earth” DTM products.
Process_Step:
Process_Description:
Data Capture of LiDAR. Source LiDAR raw point cloud data was captured in 10 aerial acquisition missions in February, April, May and November 2010: 1. Friday, March 12, 2010, 2. Saturday, March 13, 2010, 3. Tuesday, March 16, 2010, 4. Tuesday, April 27, 2010, 5. Wednesday, April 28, 2010, 6. Saturday, May 01, 2010, 7. Monday, May 03, 2010, 8. Tuesday, May 04, 2010, 9. Thursday, May 06, 2010, and 10. Tuesday, November 16, 2010. The first two flight missions cover the majority of the MRG Floodplain 500 Year Mapping Project area with the 4th (4/27/10) mission capturing the upper Middle Rio Grande River reach to Cochiti Dam. Combined with all remaining flights, these ten (10) acquisition missions cover the Regional NED Project Component. Acquired data areas are identified spatially in corresponding Collection Reports and Shapefiles.
Process_Date: 20101116
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Surdex Corporation
Contact_Address:
Address_Type: mailing and physical address
Address: 520 Spirit of St. Louis Blvd.
City: Chesterfield
State_or_Province: MO
Postal_Code: 63005
Country: UNITED STATES
Contact_Voice_Telephone: 636-532-3427
Process_Step:
Process_Description:
LiDAR Filtering / Automatic Classification. After initial data post processing to obtain source LiDAR raw point clouds, raw LiDAR data were inventoried and tested for preliminary vertical accuracy verification against project control. LiDAR raw point cloud data were then automatically classified by means of "supervised" LIDAR classification through statistical comparisons to previously existing surface elevation data over the Project Area. This first-cut automated classification was designed to obtain the “most-likely” ground surface and at the same time classify and/or discriminate primarily vegetation, buildings, and other above ground structures (or non-ground) points from ground points. Visual inspection of auto-classified ground points were then evaluated to determine how well the auto classification performed and work areas were rated for further processing steps. Work areas deemed to have a sufficient ground surface classification were passed and posted to the production database for stereo surface review while other areas with systematic classification errors were subjected to further refinements in automated classification and re-inspected to verify the best possible initial automated ground surface classification before posting to the production database.
Process_Date: 20101201
Process_Step:
Process_Description:
Quality Control (QC) Data Product Generation. Initial filtered terrain surface data stored in production database tables were read with automated routines by work area to produce Quality Control (QC) products for subsequent "targeted" inspection of automated classification results and further 3D stereo break line collection. Primary QC products included grey scale Shaded Relief as well as colorized (elevation) images. These QC products guided geospatial analysts to areas requiring additional supplemental editing of the LiDAR surface model.
Process_Date: 20101215
Process_Step:
Process_Description:
Stereo 3D LiDAR Surface Review. After a review of QC products, geospatial analysts loaded stereo models indexed vertically to the LiDAR ground points within an assigned work area. Manual review of source data (both LiDAR and DMC imagery) in stereo permitted a visual check to ensure adequate surface classification of LiDAR points with two principal tasks being performed at this stage of processing. 1. Areas needing further treatment and removal of spurious point data (often in areas of temporal change between source and new surface data) were delineated with surface edit features for subsequent point removal of outlier points not effectively modeling ground terrain. 2. Areas requiring more detailed terrain modeling were supplemented with the addition of break line features in areas where initial classification processing lacked adequate point coverage to model an effective elevation terrain surface. Stereo 3D LiDAR Surface Review was followed by independent quality review in BHI’s standard ISO 9001 compliant production work flows whereby QC data products were regenerated by an independent data reviewer in order to assess the completed extraction task previously performed during the stereo LiDAR surface review step. Inspection “call” features were placed as necessary to indicate potential rework or further processing.
Process_Date: 20101101
Process_Step:
Process_Description:
Deliverable Development. Final deliverable LiDAR-Derived Digital Terrain Model (DTM) development including contour generation was produced from final verified terrain point and supplemental stereo break line surface data stored in production database tables. Generation of LAS point cloud surface products was performed through a statistical comparison of the production database surface model compared to the original raw LiDAR point data using a surface tolerance equivalent to the maximum tolerance for the requirements of the surface product (i.e. 1 ft contour interval (CI) surface). Processing of ground points within 0.37 feet of the produced surface model were output to “ground” LAS files, while those original points outside this tolerance where output to “non-ground” LAS files. All other DTM deliverables were output directly from the production database elevation surface model.
Process_Date: 20110112

Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Raster
Raster_Object_Information:
Raster_Object_Type: Grid Cell

Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Map_Projection:
Map_Projection_Name: Transverse Mercator
Transverse_Mercator:
Scale_Factor_at_Central_Meridian: 0.9999
Longitude_of_Central_Meridian: 106.25
Latitude_of_Projection_Origin: 31.0
False_Easting: 1640416.666666667
False_Northing: 0.0
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: row and column
Coordinate_Representation:
Abscissa_Resolution: 3.0
Ordinate_Resolution: 3.0
Planar_Distance_Units: Foot_US
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1983 HARN
Ellipsoid_Name: Geodetic Reference System 80
Semi-major_Axis: 6378137.0
Denominator_of_Flattening_Ratio: 298.257222101
Vertical_Coordinate_System_Definition:
Altitude_System_Definition:
Altitude_Datum_Name: North American Vertical Datum of 1988
Altitude_Resolution: 0.37
Altitude_Distance_Units: Foot_US
Altitude_Encoding_Method:
Explicit elevation coordinate included with horizontal coordinates

Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: DEM
Entity_Type_Definition:
MRCOG Regional National Elevation Dataset (NED): Digital Elevation Model
Entity_Type_Definition_Source:
Exhibit E-Scope of Work for USGS/USACE/MRCOG 2010 Regional LiDAR Project of the Third Amendment to the Agreement dated February 12, 2008 between the Mid-Region Council of Governments and Bohannan Huston, Inc.
Overview_Description:
Entity_and_Attribute_Detail_Citation: NDEP Guidelines for Digital Elevation Data v1.0, May 2004
Entity_and_Attribute_Overview:
DTM data are delivered and stored in tiles covering approximately 0.25 sq. mile based upon the U.S. Public Land Survey System (PLSS) Sections. Tiles are produced with overlap to adjacent tiles.

Distribution_Information:
Distribution_Liability: See access and use constraints information.
Distributor:
Contact_Information:
Contact_Address:
Address: 809 Copper Ave., NW
Address_Type: mailing address
City: Albuquerque
State_or_Province: NM
Postal_Code: 87102
Contact_Voice_Telephone: 505.247.1750
Contact_Organization_Primary:
Contact_Organization: Mid Region Council of Governments

Metadata_Reference_Information:
Metadata_Date: 20110121
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Bohannan-Huston, Inc.
Contact_Position: Project Manager
Contact_Address:
Address_Type: mailing and physical address
Address: 7500 Jefferson St. NE, Courtyard I
City: Albuquerque
State_or_Province: NM
Postal_Code: 87109-4335
Country: UNITED STATES
Contact_Voice_Telephone: 800.877.5332
Contact_Facsimile_Telephone: 505.798.5332
Contact_Electronic_Mail_Address: dsandin@bhinc.com
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Time_Convention: local time
Metadata_Standard_Version: HTML Version - FGDC-STD-001-1998

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