Western Vermont 2017 QL2 LiDAR; Hydro-Flattened DEM

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: Quantum Spatial, Inc.
Publication_Date: 20180622
Title: Western Vermont 2017 QL2 LiDAR; Hydro-Flattened DEM
Geospatial_Data_Presentation_Form: Raster digital data
Description:
Abstract:
Product: These are Digital Elevation Model (DEM) data for Western Vermont as part of the required deliverables for the Western Vermont 2017 QL2 LiDAR project. Class 2 (ground) lidar points in conjunction with the hydro breaklines were used to create a 0.7-meter hydro-flattened raster DEM. This lidar data set includes classified LAS 1.4 files, hydro-flattened and hydro-enforced digital elevation models (DEMs), digital surface models (DSM), hydro-flattened and hydro-enforced breaklines, intensity imagery, and topographic contours. Geographic Extent: Three AOIs including eight partial counties in Western Vermont, covering approximately 1,190 total square miles. The northern AOI encompasses portions of Grand Isle, Franklin, Orleans, and Lamoille Counties. The central AOI includes a portion of Addison County. The southern AOI contains most of Bennington County and portions of Rutland and Windham Counties. Dataset Description: Western Vermont 2017 QL2 Lidar project called for the planning, acquisition, processing, and derivative products of lidar data to be collected at a nominal pulse spacing (NPS) of 0.7 meters. Project specifications are based on the U.S. Geological Survey National Geospatial Program Base Lidar Specification, Version 1.2. The data were developed based on a horizontal projection/datum of NAD83 (2011), Vermont FIPS 4400, meters and vertical datum of NAVD88 (GEOID12B), meters. Lidar data were delivered as processed classified LAS 1.4 files formatted to 2,839 individual 1,400 m x 1,400 m tiles, as tiled bare earth DEMs, and tiled intensity imagery; all tiled to the same 1,400 m x 1,400 m schema. Digital surface models (DSM) were processed in 0.7-meter cell ERDAS .img format. Continuous breaklines and 1-foot contour lines were produced in Esri file geodatabase format. Ground Conditions: Lidar was collected in fall of 2017, while no snow was on the ground and rivers were at or below normal levels. In order to post process the lidar data to meet task order specifications and meet ASPRS vertical accuracy guidelines, Quantum Spatial, Inc. established a total of 48 ground control points that were used to calibrate the lidar to known ground locations established throughout the Western Vermont project area. An additional 210 independent accuracy checkpoints, 122 in Bare Earth and Urban landcovers (122 NVA points), 88 in Forested, Shrubs, and Tall Weeds categories (88 VVA points), were used to assess the vertical accuracy of the data. These checkpoints were not used to calibrate or post process the data.
Purpose:
To acquire detailed surface elevation data for use in conservation planning, design, research, floodplain mapping, dam safety assessments and elevation modeling, etc. Classified LAS files are used to show the manually reviewed bare earth surface. This allows the user to create intensity images, breaklines, and raster DEMs. The purpose of these lidar data was to produce high accuracy 3D hydro-flattened digital elevation models (DEMs) with a 0.7 meter cell size. These raw lidar point cloud data were used to create classified lidar LAS files, hydro-flattened and hydro-enforced DEMs, digital surface models (DSM), 3D breaklines, intensity images, and topographic contours as necessary.
Supplemental_Information:
USGS Contract: G16PC00016, Task Order Number: G17PD01130; CONTRACTOR: Quantum Spatial, Inc.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20171105
Ending_Date: 20171121
Currentness_Reference: ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -73.4158876014
East_Bounding_Coordinate: -72.38497054
North_Bounding_Coordinate: 45.0175645347
South_Bounding_Coordinate: 42.738010963
Keywords:
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: Model
Theme_Keyword: Raster
Theme_Keyword: DEM
Theme_Keyword: Remote Sensing
Theme_Keyword: Elevation Data
Theme_Keyword: Lidar
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: Vermont
Place_Keyword: Addison County
Place_Keyword: Bennington County
Place_Keyword: Franklin County
Place_Keyword: Grand Isle County
Place_Keyword: Lamoille County
Place_Keyword: Orleans County
Place_Keyword: Rutland County
Place_Keyword: Windham County
Access_Constraints: No restrictions apply to this data.
Use_Constraints:
None. However, users should be aware that temporal changes may have occurred since this dataset was collected and that some parts of these data may no longer represent actual surface conditions. Users should not use these data for critical applications without a full awareness of its limitations. Acknowledgement of the U.S. Geological Survey would be appreciated for products derived from these data.
Data_Quality_Information:
Logical_Consistency_Report: Data covers the entire area specified for this project.
Completeness_Report:
Datasets contain complete coverage of tiles. No points have been removed or excluded. A visual qualitative assessment was performed to ensure data completeness. There are no void areas or missing data. The raw point cloud is of good quality and data passes Non-Vegetated Vertical Accuracy specifications.
Positional_Accuracy:
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
The project specifications require that only Non-Vegetated Vertical Accuracy (NVA) be computed for raw lidar point cloud swath files. The required accuracy (ACCz) is: 19.6 cm at a 95% confidence level, derived according to NSSDA, i.e., based on RMSE of 10 cm in the "bare earth" and "urban" land cover classes. The NVA was tested with 122 checkpoints located in bare earth and urban (non-vegetated) areas. These checkpoints were not used in the calibration or post processing of the lidar point cloud data. The checkpoints were distributed throughout the project area and were surveyed using GPS techniques. See survey report for additional survey methodologies. Elevations from the unclassified lidar surface were measured for the x,y location of each checkpoint. Elevations interpolated from the lidar surface were then compared to the elevation values of the surveyed control points. AccuracyZ has been tested to meet 19.6 cm or better Non-Vegetated Vertical Accuracy at 95% confidence level using RMSE(z) x 1.9600 as defined by the National Standards for Spatial Data Accuracy (NSSDA); assessed and reported using National Digital Elevation Program (NDEP)/ASRPS Guidelines. The project specifications require the accuracy (ACCz) of the derived DEM be calculated and reported in two ways: 1. The required NVA is: 19.6 cm at a 95% confidence level, derived according to NSSDA, i.e., based on RMSE of 10 cm in the "bare earth" and "urban" land cover classes. This is a required accuracy. The NVA was tested with 122 checkpoints located in bare earth and urban (non-vegetated) areas. 2. Vegetated Vertical Accuracy (VVA): VVA shall be reported for "forested", "shrubs", and "tall weeds" land cover classes. The target VVA is: 29.4 cm at the 95th percentile, derived according to ASPRS Guidelines, Vertical Accuracy Reporting for Lidar Data, i.e., based on the 95th percentile error in all vegetated land cover classes combined. This is a target accuracy. The VVA was tested with 88 checkpoints located in forested, shrubs, and tall weeds (vegetated) areas. The checkpoints were distributed throughout the project area and were surveyed using GPS techniques. See survey report for additional survey methodologies. AccuracyZ has been tested to meet 19.6 cm or better Non-Vegetated Vertical Accuracy at 95% confidence level using RMSE(z) x 1.9600 as defined by the National Standards for Spatial Data Accuracy (NSSDA); assessed and reported using National Digital Elevation Program (NDEP)/ASRPS Guidelines.
Quantitative_Vertical_Positional_Accuracy_Assessment:
Vertical_Positional_Accuracy_Value: 0.095
Vertical_Positional_Accuracy_Explanation:
Tested 0.095 meters NVA at a 95% confidence level using RMSE(z) x 1.9600 as defined by the National Standards for Spatial Data Accuracy (NSSDA). The NVA of the DEM was calculated using 122 independent checkpoints located in the Bare Earth and Urban land cover categories.
Quantitative_Vertical_Positional_Accuracy_Assessment:
Vertical_Positional_Accuracy_Value: 0.267
Vertical_Positional_Accuracy_Explanation:
Tested 0.267 meters VVA was calculated using 88 checkpoints located in the Forested, Brushland/Trees, and Tall Weeds/Crops land cover categories at the 95th percentile, derived according to ASPRS Guidelines, Vertical Accuracy Reporting for Lidar Data. Tested against the DEM.
Lineage:
Process_Step:
Process_Description:
Hydro-Flattened Raster DEM Processing: Class 2 (Ground) LiDAR points in conjunction with the hydro-breaklines were used to create a 0.7-meter hydro-flattened raster DEM. Using automated scripting routines within ArcMap, an ERDAS Imagine .IMG file was created for each tile. Each surface was reviewed using Global Mapper to check for any surface anomalies or incorrect elevations found within the surface.
Process_Date: 2018
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Raster
Raster_Object_Information:
Raster_Object_Type: Pixel
Row_Count: 2000
Column_Count: 2000
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: 4400
Transverse_Mercator:
Scale_Factor_at_Central_Meridian: 0.999964285714286
Longitude_of_Central_Meridian: -72.5
Latitude_of_Projection_Origin: 42.5
False_Easting: 500000.0
False_Northing: 0.0
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 0.7
Ordinate_Resolution: 0.7
Planar_Distance_Units: meters
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1983 (2011)
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 (GEOID12B)
Altitude_Resolution: 0.01
Altitude_Distance_Units: meters
Altitude_Encoding_Method:
Explicit elevation coordinate included with horizontal coordinates
Distribution_Information:
Distributor:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Patrick Emmett
Contact_Organization: U.S. Geological Survey (USGS)
Contact_Position: USGS Cartographer
Contact_Address:
Address_Type: mailing and physical address
Address: 1400 Independence Road MS 666
City: Rolla
State_or_Province: MO
Postal_Code: 65401
Country: USA
Contact_Voice_Telephone: 573-308-3587
Contact_Electronic_Mail_Address: pemmett@usgs.gov
Resource_Description:
USGS distributes data directly to program partners. Public access to the data is available from the USGS.
Distribution_Liability:
In no event shall the creators, custodians, or distributors of these data be liable for any damages arising out of its use, or from the inability of the customer to use these data for their intended application. All deliverable data and documentation shall be free from restrictions regarding use and distribution. Data and documentation shall be freely distributable by government agencies.
Distribution_Information:
Distributor:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Mike Brouillette
Contact_Organization: Vermont Center for Geographic Information, State of Vermont
Contact_Position: Senior Project Manager (GISP)
Contact_Address:
Address_Type: mailing and physical address
Address: 1 National Life Dr., Davis Building, 6th Floor
City: Montpelier
State_or_Province: VT
Postal_Code: 05620-0501
Country: USA
Contact_Voice_Telephone: 802-882-3008
Contact_Electronic_Mail_Address: mike.brouillette@vermont.gov
Resource_Description:
The State of Vermont distributes data directly to program partners. Public access to the data is available from the State of Vermont.
Distribution_Liability:
In no event shall the creators, custodians, or distributors of these data be liable for any damages arising out of its use, or from the inability of the customer to use these data for their intended application. All deliverable data and documentation shall be free from restrictions regarding use and distribution. Data and documentation shall be freely distributable by government agencies.
Distribution_Information:
Distributor:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Kerry Bogdan
Contact_Organization: FEMA Region I
Contact_Position: FEMA Region I Senior Engineer/Program Manager
Contact_Address:
Address_Type: mailing and physical address
Address: 99 High Street, 6th Floor
City: Boston
State_or_Province: MA
Postal_Code: 02110
Country: USA
Contact_Voice_Telephone: 617-956-7576
Contact_Electronic_Mail_Address: kerry.bogdan@fema.dhs.gov
Resource_Description:
FEMA distributes data directly to program partners. Public access to the data is available from FEMA.
Distribution_Liability:
In no event shall the creators, custodians, or distributors of these data be liable for any damages arising out of its use, or from the inability of the customer to use these data for their intended application. All deliverable data and documentation shall be free from restrictions regarding use and distribution. Data and documentation shall be freely distributable by government agencies.
Distribution_Information:
Distributor:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Diane Burbank
Contact_Organization: U.S. Forest Service
Contact_Position: Forest Ecologist
Contact_Address:
Address_Type: mailing and physical address
Address: Middlebury District, 1007 Rte. 7 South
City: Middlebury
State_or_Province: VT
Postal_Code: 05753
Country: USA
Contact_Voice_Telephone: 802-388-4362
Contact_Electronic_Mail_Address: dburbank@fs.fed.us
Resource_Description:
The U.S. Forest Service distributes data directly to program partners. Public access to the data is available from the U.S. Forest Service.
Distribution_Liability:
In no event shall the creators, custodians, or distributors of these data be liable for any damages arising out of its use, or from the inability of the customer to use these data for their intended application. All deliverable data and documentation shall be free from restrictions regarding use and distribution. Data and documentation shall be freely distributable by government agencies.
Distribution_Information:
Distributor:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Reed Sims
Contact_Organization: Natural Resources Conservation Service
Contact_Position: GIS Specialist
Contact_Address:
Address_Type: mailing and physical address
Address: USDA NRCS VT State Office, 356 Mountain View Drive, Suite 105
City: Colchester
State_or_Province: VT
Postal_Code: 05446
Country: USA
Contact_Voice_Telephone: 802-951-6796
Contact_Electronic_Mail_Address: reed.sims@vt.usda.gov
Resource_Description:
The Natural Resources Conservation Service distributes data directly to program partners. Public access to the data is available from the Natural Resources Conservation Service.
Distribution_Liability:
In no event shall the creators, custodians, or distributors of these data be liable for any damages arising out of its use, or from the inability of the customer to use these data for their intended application. All deliverable data and documentation shall be free from restrictions regarding use and distribution. Data and documentation shall be freely distributable by government agencies.
Metadata_Reference_Information:
Metadata_Date: 20180621
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Quantum Spatial
Contact_Address:
Address_Type: mailing and physical
Address: 523 Wellington Way
City: Lexington
State_or_Province: KY
Postal_Code: 40503
Country: USA
Contact_Voice_Telephone: 859-277-8700
Contact_Facsimile_Telephone: 859-277-8901
Hours_of_Service: Monday through Friday 8:00 AM to 5:00 PM (Eastern Time)
Contact_Instructions:
If unable to reach the contact by telephone, please send an email. You should get a response within 24 hours.
Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Access_Constraints: None.
Metadata_Use_Constraints: None.
Metadata_Security_Information:
Metadata_Security_Classification_System: None.
Metadata_Security_Classification: Unclassified
Metadata_Security_Handling_Description: NONE
Generated by mp version 2.9.22 on Wed Dec 19 18:43:32 2018