LiDAR Bare-Earth DEM Extents and Overall Project metadata

Identification_Information:

Citation:

Citation_Information:

Originator: Bohannan Huston, Inc.
Publication_Date: 20160222
Title: LiDAR Bare-Earth DEM Extents and Overall Project metadata
Geospatial_Data_Presentation_Form: vector digital data
Series_Information:

Series_Name: Santa Fe County 2014 Regional LiDAR Project
Issue_Identification: Extents

Publication_Information:

Publication_Place:

102 Grant Avenue Santa Fe, NM 87501

Publisher: Santa Fe County

Other_Citation_Details:

This dataset was created as a joint effort between Santa Fe County, the US Geological Survey, Bohannan Huston, Inc. and Aero-Graphics, Inc. in support of Santa Fe County Geographic Information Systems' mission. Creation of this spatial extents file for the project is per USGS tm11-B4 version 1.2 to develop a georeferenced, digital spatial representation of the detailed extents based on the derived (DEM) product data as part of the project’s metadata deliverables. As this spatial data coverage provides a global view of the project data extents and thus describes the project data boundary, this metadata file also serves as the "Overall Project" metadata file summarizing additional aspects of the project including intent, types of data collected, deliverables and additional other project-wide information.

Online_Linkage: http://www.santafecountynm.gov/growth_management/gis

Description:

Abstract:

Between March 12 and August 11, 2014, light detection and ranging (LiDAR) data was acquired over the entirety of Santa Fe County (SFCO) in New Mexico, as well as portions of Rio Arriba, Taos, Mora, Los Alamos, San Miguel, Torrance, Sandoval and Bernalillo Counties. The LiDAR project defined project area (DPA) covers approximately 3,000 square miles of urban, desert, and mountain area corresponding to 50 US Geological Survey (USGS) 7.5 minute quadrangles. The goal of this effort was to develop LiDAR data meeting the USGS Quality Level 2 (QL2) standard in support of Santa Fe County’s on-going GIS, planning and management objectives. Also in March 2014, a digital aerial photography acquisition mission collected 6-inch ground sample distance (GSD) aerial imagery over approximately 75% of the project’s LiDAR DPA. Spatial extents of the project pertain to the extents of DEM product data deliverables and are described in a metadata shapefile (sfco2014_extents.shp) which reflects the detailed project extents, exclusive of raster void areas. The polygon extents are defined by the 3627 individual DEM (USGS) data tiles. Tile boundaries of these tiles are represented in the tile index file (USGS_tile_index_5000.shp). Development of the spatial project data extents is data driven and established from the actual DEM raster data content, rather than a simple union of the tile index. To generate the product data extents, a seamless full project DEM mosaic was first produced. The pixels in the mosaic were converted to a binary raster mask and subsequently this raster mask was converted from raster to vector format as a means of representing the precise spatial extents of product data deliverables. This approach results in an extents boundary describing only those areas where actual terrain deliverable data are located of the project. Overall project deliverables include those product groups established in the USGS tm11-B4 version 1.2. Specific product level metadata for each of these groups is provided in individual metadata files for each deliverable product group containing more detail on the product and process descriptions for development of each. Deliverables include: Classified point data, Bare-earth DEMs, Breaklines and Metadata. Two series of these data were created according to two separate project tiling schemes—USGS (non-overlapping, edge-matched 5000’x5000’ tiles) and SFCO (Public Land Survey System (PLSS) section-based overlapping tiles).

Purpose:

The purpose of this project is to support activities throughout Santa Fe County, including but not limited to urban, community and regional planning; project and infrastructure planning; project reporting; floodplain mapping; stormwater management; vegetation analysis; change detection; and initial project reviews.

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20140312
Ending_Date: 20140811

Currentness_Reference: ground condition

Status:

Progress: Complete
Maintenance_and_Update_Frequency: As needed

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: 106° 15' 29.337364"W
East_Bounding_Coordinate: 105° 36' 38.644749"W
North_Bounding_Coordinate: 36° 15' 13.244489"N
South_Bounding_Coordinate: 34° 59' 26.579322"N

Keywords:

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: Elevation

Place:

Place_Keyword_Thesaurus: http://www.getty.edu/research/tools/vocabularies/tgn/
Place_Keyword: Santa Fe County
Place_Keyword: Rio Arriba County
Place_Keyword: Taos County
Place_Keyword: Mora County
Place_Keyword: Los Alamos County
Place_Keyword: San Miguel County
Place_Keyword: Torrance County
Place_Keyword: Sandoval County
Place_Keyword: Bernalillo County
Place_Keyword: New Mexico
Place_Keyword: United States of America

Access_Constraints: None
Use_Constraints:

Neither Santa Fe County, nor Bohannan Huston, Inc. (BHI) assumes liability for misuse of the data. Data should be used at the scale for which they were intended. No warranty, expressed, or implied, is made by Santa Fe County nor BHI regarding the utility of the data on any other system, nor shall the act of distribution constitute such warranty.

Point_of_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Santa Fe County
Contact_Person: Erle Wright, GISP

Contact_Position: GIS Manager
Contact_Address:

Address_Type: mailing address
Address: 102 Grant Avenue
City: Santa Fe
State_or_Province: NM
Postal_Code: 87501
Country: USA

Contact_Voice_Telephone: 505-986-6350
Contact_Electronic_Mail_Address: ewright@santafecountynm.gov

Browse_Graphic:

Browse_Graphic_File_Name: sfco2014_extents.pdf
Browse_Graphic_File_Description:

View of LiDAR project extents shapefile displayed with slope map background.

Browse_Graphic_File_Type: portable document format

Data_Set_Credit:

Acknowledgement of Santa Fe County GIS, the U.S. Geological Survey, Bohannan Huston, Inc. and Aero-Graphics, Inc. would be appreciated for products derived from these data.

Native_Data_Set_Environment:

Intergraph GeoMedia Professional Ver. 14.00.0002.00088; Intergraph ERDAS IMAGINE 2014 Ver. 14.00.0100 Build 715; FME Desktop 2015.0 (Build 15244); Window 7 Enterprise SP1

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

The spatial extents boundary was delineated from a 2 ft resolution Digital Elevation Model (DEM). A raster mask was generated from the project-wide mosaic DEM in which the mask was assigned a value of 1 to distinguish from areas of actual legitimate DEM elevation values versus those areas containing “NODATA” values (e.g. -32767). This mask value has been carried forward as an attribute of the vector extents data representation.

Logical_Consistency_Report:

DEM features used to create the extents shapefile have been reviewed and assessed with a variety of methods to ensure that void areas are excluded from the construction of the derivative product data boundary. The analysis consisted of generation of contour data to search for high density contour vectors, which were in turn, used to define clipping areas to trim back the boundary to only portray logically consistent elevation data representative of actual terrain features collected from project LiDAR sources.

Completeness_Report:

Swath data were inspected to ensure complete terrain data coverage to the extent possible excluding acceptable data voids, for example over water bodies where point returns may not be reflected in the point cloud thus producing an acceptable data void. Overall the processing of the DEM data is comprised of 409 flight line data sources that were used to develop classified LiDAR point cloud data tiles and corresponding DEM product. Spatial LiDAR swath/strip/flight line source spatial metadata covering the project are defined by flight line index information.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report: Tested 1.5 ft horizontal accuracy (NSSDA).
Quantitative_Horizontal_Positional_Accuracy_Assessment:

Horizontal_Positional_Accuracy_Value: 1.5
Horizontal_Positional_Accuracy_Explanation:

LiDAR point cloud data were tested horizontally with 65 paneled or otherwise visible ground control points. Comparison of the horizontal ground control coordinates to the corresponding control point locations on LiDAR intensity imagery (with 2 ft GSD) were measured at the visible center of each control point panel to form the basis of the horizontal test. Reported accuracies developed from the sample of 65 control points exhibit a horizontal RMSExy of 0.9 ft or 27 cm. Based upon project flying height, the expected horizontal positional error of the LiDAR point data would similarly be approximately 0.66 ft according to Table B.10 of the ASPRS Positional Accuracy Standards for Digital Geospatial Data. Since the spatial extents, however, represent the 2D horizontal positional location of derived DEM data, the horizontal accuracy of this boundary may reasonably be expected correspond to the tested/reported value. Nonetheless, it should also be recognized that the boundary is not a “well-defined” feature. Based on this testing, therefore the boundary’s positional accuracy may be expected to be within approximately 1 to 2 pixels (1.9 ft RMSEr and 2.2 ft at the 95% confidence level).

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report: Tested 0.63 ft vertical accuracy (NSSDA).
Quantitative_Vertical_Positional_Accuracy_Assessment:

Vertical_Positional_Accuracy_Value: 0.63
Vertical_Positional_Accuracy_Explanation:

Data were processed to meet a 1 ft contour interval data vertical accuracy at the 95% confidence level (RMSEz of 0.33 ft) in compliance with absolute vertical accuracy specifications for Quality Level 2 (QL2) DEM data. Ninety-five percent of well-defined features in non-vegetated areas are expected to be within 0.64 ft of their true vertical position on the ground.

Lineage:

Source_Information:

Source_Citation:

Citation_Information:

Originator: Bohannan Huston, Inc.; Alan R. Benham, P.S.
Publication_Date: 20141027
Title: Survey Control Report for SANTA FE COUNTY

Source_Scale_Denominator: 240
Type_of_Source_Media: Portable Document Format
Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 20141027

Source_Currentness_Reference: ground condition

Source_Citation_Abbreviation: 20140344 Santa Fe Control Report REVISED 10-27-2014 SIGNED.pdf
Source_Contribution:

Geodetic control was established for the project to provide a primary control network for LIDAR and orthophotography mapping in the project coordinate system.

Source_Information:

Source_Citation:

Citation_Information:

Originator: Aero-Graphics Inc.
Publication_Date: 20140924
Title:

Airborne LiDAR Collection - Optech Orion H300 laser scanner with Inertial Measurement Unit (IMU) and on-board Global Positioning System (GPS).

Geospatial_Data_Presentation_Form: LiDAR Point Cloud

Source_Scale_Denominator: 600
Type_of_Source_Media: Hard drive
Source_Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20140312
Ending_Date: 20140811

Source_Currentness_Reference: ground condition

Source_Citation_Abbreviation: SFCO2014_LiDAR_SWATH.shp
Source_Contribution:

LIDAR data was captured using an Optech ALTM Orion H300 LiDAR system with an inertial measurement unit (IMU) and dual frequency GPS receiver. Project acquisition with LiDAR sensors was organized into 5 acquisition blocks or "quadrants." Quadrants 1 and 5 predominantly covered the more mountainous areas of the project with more significant relief. Quadrants 2, 3, and 4 were acquired over the primarily flatter desert areas. Data acquisition across the project was designed to achieve a 0.7 m nominal pulse spacing (NPS).

Source_Information:

Source_Citation:

Citation_Information:

Originator: Aero-Graphics Inc.
Publication_Date: 20140924
Title:

Airborne Collection - Microsoft/Vexcel UltraCam Eagle (UCE) digital camera system with Inertial Measurement Unit (IMU) and on-board Global Positioning System (GPS).

Geospatial_Data_Presentation_Form: Image

Source_Scale_Denominator: 1200
Type_of_Source_Media: Hard drive
Source_Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20140310
Ending_Date: 20140620

Source_Currentness_Reference: ground condition

Source_Citation_Abbreviation: SFCO2014_PHOTO_FOOTPRINTS.shp
Source_Contribution:

Digital aerial imagery was collected at a nominal average altitude of 9,466 ft above ground level (AGL) using the Microsoft/Vexcel UltraCam Eagle (UCE) digital camera system. The UCE aerial imagery served the purpose of supporting the production of 6 inch ground sample distance (GSD) resolution digital orthoimagery for interpretive value in evaluation and development of LiDAR-elevation products.

Source_Information:

Source_Citation:

Citation_Information:

Originator: USDA Aerial Photography Field Office (APFO)
Publication_Date: 20150313
Title: National Agriculture Imagery Program (NAIP) Imagery
Geospatial_Data_Presentation_Form: Image
Online_Linkage:

http://gis.apfo.usda.gov/arcgis/services/NAIP/New_Mexico_2014_1m/ImageServer/WMSServer?

Source_Scale_Denominator: 12000
Type_of_Source_Media: online
Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 2014

Source_Currentness_Reference: ground condition

Source_Citation_Abbreviation: New_Mexico_2014_1m_NC
Source_Contribution:

For project areas outside of the UCE aerial imagery coverage, 2014 NAIP imagery with a 1 m GSD resolution was used to support interpretive value in evaluation and development of LiDAR-elevation products. In particular over these NAIP areas, imagery supported the definition of 2D polygons utilized in waterbody hydro flattening and point classification.

Process_Step:

Process_Description:

1. Mosaic DEM product group. A full project-wide elevation mosaic was developed from the 3627 individual DEM (USGS) data tiles. This elevation data content formed the basis for outlining the spatial extents of actual LiDAR derived product data.

Process_Date: 20160222

Process_Step:

Process_Description:

2. Binary Raster Mask Creation. Using the full DEM mosaic a binary raster map discriminating areas of actual elevation data from nodata areas was generate. This mask was assigned a numeric value of "1".

Process_Date: 20160311

Process_Step:

Process_Description:

3. Vectorization. The project detailed extents was converted from raster to vector from. This process outlines the extents of the raster DEM mask by outlining the detailed raster boundary at the native 2 ft resolution of the DEM product group. Given the pixel level detailed nature of this dataset the spatial extents is comprised of five polygon features (four of which relate to single pixel outlined geometry). This polygon dataset was output as an Esri polygon shapefile.

Process_Date: 20160311

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: G-Polygon
Point_and_Vector_Object_Count: 5

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: 3002
Transverse_Mercator:

Scale_Factor_at_Central_Meridian: 0.9999
Longitude_of_Central_Meridian: -106.25
Latitude_of_Projection_Origin: 31.0
False_Easting: 1640416.667
False_Northing: 0.0

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:

Abscissa_Resolution: 0.01
Ordinate_Resolution: 0.01

Planar_Distance_Units: survey Feet

Geodetic_Model:

Horizontal_Datum_Name: North American Datum of 1983 (HARN)
Ellipsoid_Name: Geodetic Reference System 80
Semi-major_Axis: 6378137
Denominator_of_Flattening_Ratio: 298.257222101

Vertical_Coordinate_System_Definition:

Altitude_System_Definition:

Altitude_Datum_Name: North American Vertical Datum of 1988
Altitude_Resolution: 0.01
Altitude_Distance_Units: Feet
Altitude_Encoding_Method: Implicit coordinate

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: value
Entity_Type_Definition:

Numeric cell value assigned to create binary raster mask for later conversion to vector format in polygon form. The cell value was transferred as an attribute in the spatial extents vector polygon stored in ESRI polygon format.

Entity_Type_Definition_Source: User-defined

Attribute:

Attribute_Label: value
Attribute_Definition: Value representing the presence of terrain elevation data.
Attribute_Definition_Source:

Generated during binary mask creation and carried through polygon development.

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: 1
Enumerated_Domain_Value_Definition: actual lidar source or derived product data
Enumerated_Domain_Value_Definition_Source: USGS tm11-B4 version 1.2; User-defined value.

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Santa Fe County
Contact_Person: Erle Wright, GISP

Contact_Position: Data Integration Administrator
Contact_Address:

Address_Type: mailing address
Address: 102 Grant Avenue
City: Santa Fe
State_or_Province: New Mexico
Postal_Code: 87501
Country: USA

Contact_Voice_Telephone: 505-986-6350
Contact_Electronic_Mail_Address: ewright@santafecountynm.gov

Resource_Description: Hard drive
Distribution_Liability:

The County of Santa Fe, New Mexico, is furnishing these geographic data on an "as is" basis, and Santa Fe County makes no guarantee, representation or warranty concerning the accuracy or completeness of information contained in the geographic data. Santa Fe County further makes no guarantees, representations or warranties, either expressed or implied, as to any other matter whatsoever concerning the data and product, including, without limitation, the condition of the product, or its fitness for any particular use or purpose. The burden for determining fitness for use lies entirely with the user. Although these data have been processed successfully on computers of Bohannan Huston, Inc. (BHI) and served by Santa Fe County, no guarantee, representation or warranty, either expressed or implied, is made by Santa Fe County or BHI regarding the use of these data on any other system, nor does the fact of distribution constitute or imply any such guarantee, representation or warranty. In no event shall Santa Fe County or BHI have any liability whatsoever for payment of any consequential, incidental, indirect, special, or tort damages of any kind, including, but not limited to, any loss of profits arising out of use of or reliance on the geographic data or arising out of the delivery, installation, operation, or support by Santa Fe County.

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Format_Name: ESRI Shapefile
Format_Information_Content: 3D Polygon

Digital_Transfer_Option:

Offline_Option:

Offline_Media: Hard Drive
Recording_Format: ISO 9660

Fees:

Fees are based on the cost of time and materials, per the Public Records Act and Ordinance #2009-6 "Data Fee Ordinance" in effect as of July 30, 2009. Ordering_Instructions: http://www.santafecountynm.gov/growth_management/gis/gis_products

Ordering_Instructions:

http://www.santafecountynm.gov/growth_management/gis/gis_products

LiDAR Bare-Earth DEM Extents and Overall Project metadata

Metadata: