ElevationOther_nDSM0p7M2014

Metadata:

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

Identification_Information:

Citation:

Citation_Information:

Originator:

Vermont Center for Geographic Information (VCGI), NRCS, USGS, VT ANR, VTRANS, University of Vermont Spatial Analysis Lab (UVM-SAL), and other members of the VCGI Lidar Program, i.e., 'VTeam Lidar'.

Publication_Date: 20180209

Publication_Time: As Updated.

Title: ElevationOther_nDSM0p7M2014

Edition: 2018A

Geospatial_Data_Presentation_Form: raster digital data

Series_Information:

Series_Name:

Normalized Digital Surface Model (nDSM) generated from DEM & DSM data in the VCGI Lidar Program archive of the same resolution, i.e., resolution class 'RESCLASS'.

Issue_Identification: 2018A

Publication_Information:

Publication_Place: Montpelier VT 05620-2001

Publisher: VT Center for Geographic Information

Other_Citation_Details:

Tile Structure - QL2 collections have 1400m x 1400m based on VTSPC origin (0, 0); QL3 and earlier collections tiles vary.

Description:

Abstract:

This metadata applies to the following collection area(s): Eastern VT 2014 0.7m and related 'normalized' Digital Surface Model (nDSM). Created nDSM using the ArcGIS 'MINUS' command where each pixel represents the height above ground (not above sea level) and is calculated by subtracting the DEM from the DSM, with vertical units in meters. This metadata complies with the VT Geodata Portal format and applies to thematic layers with the same resolution (RESCLASS), e.g., 0p7m, 1m etc., and may include multiple data 'collection' efforts. For original vendor metadata and reports containing specific details on each data collection, e.g., 'point cloud' flight dates, nominal pulse spacing, RMSEz and more, navigate to https://drive.google.com/drive/folders/1BFtJiwqPrO5iJ_HeSS8TeSrP-6xDo7RI. NOTE: The QL2 (0.7m) collections FOCUS reports contain myriad collection details in report form. The equivalent for the older QL3 collections are generally the “Project Reports". For an overview of the 'VCGI Lidar Program' please see 'https://vcgi.vermont.gov/data-and-programs/lidar-program'.

Purpose:

To provide Vermont with the best available, Lidar based DEM and derived datasets. The VCGI Lidar Program is a collaboration of both public and private interests working towards the common goal of full state Lidar coverage. Ultimately, each Lidar dataset becomes integrated with the U.S. Geological Survey (USGS) 3D Elevation Program (3DEP) national data repository (3DEP abstract - https://pubs.usgs.gov/circ/1399/). Implemented in 2012 to address the growing need for high quality topographic data, the 3DEP absorbed its predecessor, the National Elevation Dataset (NED). Lidar in Vermont includes two 'Elevation Quality Levels (QL)': 'QL2' and 'QL3' (See the 'Resources: Lidar Data Quality Levels (QLs)' link for details at - 'https://vcgi.vermont.gov/data-and-programs/lidar-program').

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20141108

Ending_Date: 20150417

Currentness_Reference: Ground Conditions

Status:

Progress: In work

Maintenance_and_Update_Frequency: Unknown

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -73.454162

East_Bounding_Coordinate: -71.465281

North_Bounding_Coordinate: 45.018361

South_Bounding_Coordinate: 42.722789

Keywords:

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Category

Theme_Keyword: 3D Elevation Program (3DEP)

Theme_Keyword: nDSM

Theme_Keyword: normalized Digital Surface Model

Theme_Keyword: grid

Theme_Keyword: Lidar

Theme_Keyword: Light Detection And Ranging

Theme_Keyword: LAS Point Cloud

Theme_Keyword: high-resolution

Theme_Keyword: topography

Theme_Keyword: USGS

Theme_Keyword: U.S. Geological Survey

Theme_Keyword: DEM

Theme_Keyword: Digital elevation model

Theme_Keyword: elevation

Theme_Keyword: Digital terrain model

Theme_Keyword: Surface Model

Theme_Keyword: Hydrologic

Theme_Keyword: Hydrologic Modeling

Theme_Keyword: Drainage Area

Theme_Keyword: Hydrology

Theme_Keyword: imageryBaseMapsEarthCover

Theme_Keyword: 010

Theme_Keyword: geoscientificInformation

Theme_Keyword: 008

Theme_Keyword: location

Theme_Keyword: 013

Theme:

Theme_Keyword_Thesaurus: American Society of Photogrammetry and RemoteSensing

Theme_Keyword: National Standards for Spatial Digital Accuracy (NSSDA)

Place:

Place_Keyword_Thesaurus:

U.S. Department of Commerce, 1995, Countries, dependencies, areas of special sovereignty, and their principal administrative divisions, Federal Information Processing Standard 10-4,): Washington, D.C., National Institute of Standards and Technology

Place_Keyword: United States

Place_Keyword: U.S.

Place_Keyword: US

Place_Keyword: USA

Place_Keyword: Vermont

Place_Keyword: VT

Temporal:

Temporal_Keyword_Thesaurus: None

Temporal_Keyword: 2016

Access_Constraints:

VCGI and the State of VT make no representations of any kind, including but not limited to the warranties of merchantability or fitness for a particular use, nor are any such warranties to be implied with respect to the data.

Use_Constraints:

None. However, users should be aware that no assessment of the accuracy of DEM data or data products has been made by VCGI. Users should also 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 it's limitations. Acknowledgement of the U.S. Geological Survey would be appreciated for products derived from these data.

Point_of_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: VT Center for Geographic Information

Contact_Address:

Address_Type: Mailing and Physical Address

Address: 1 National Life Dr, Dewey Building, 2nd Floor

City: Montpelier

State_or_Province: VT

Postal_Code: 05620-2001

Country: USA

Contact_Voice_Telephone: (802) 585-0820

Contact_TDD/TTY_Telephone: None

Contact_Facsimile_Telephone:

Contact_Electronic_Mail_Address: vcgi@vermont.gov

Hours_of_Service: 9am - 5pm, M-F

Data_Set_Credit:

Each Lidar 'collection' effort is a collaboration of federal, state, regional and local partners.

Security_Information:

Security_Classification_System: N/A

Security_Classification: Unclassified

Security_Handling_Description: No Security Considerations

Native_Data_Set_Environment: ESRI ArcGIS software

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

Logical_Consistency_Report:

DEM deliverables were tested by the providing vendor and the U.S. Geological Survey to be compliant with the Lidar Base Specification. 2013-2015 DSMs were created by UVM-SAL while 2016 & 2017 DSMs were part of original vendor deliveries. DSMs and the nDSMs created by VCGI were subject to an extensive quality control quality effort – see Vertical Positional Accuracy Report below for details. For each vendor provided 'collection extent', all data is seamless from one tile to the next, no gaps or no data areas.

Completeness_Report:

Datasets contain complete coverage of each individual data collection area (extent) - see the VCGI Lidar data product web page for details - https://vcgi.vermont.gov/data-and-programs/lidar-program.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report:

While DSMs and the derived nDSMs datasets should technically mirror source DEM accuracies (RMSEz in open terrain is 9.25cm for QL2), the cost intensive processing applied to DEM source points, e.g., 'point classification' = 'last return', was not applied to the DSM source points, e.g., ‘point classification’ = 'first return', for cost reasons. The impact of this cost saving measure were a small number of 'Noise' points classified as 'first return' not filtered from the point cloud source data resulting in 'out-of-range' values for both DSMs and the nDSMs map algebra derivatives (DSM – DEM). These values were more extreme and observable once mosaic datasets for the nDSMs were created and exhibited an unrealistic value range of -539m to 1374m for “height of feature” objects where the tallest natural feature is 44m, tallest building is 40m and tallest wind turbine is 80m (excluding cell towers and transmission lines). For an overview of this issue see the following internal VCGI report (VT Lidar DSM and nDSM Datasets – Impact Assessment of “Out-of-Range” Data Points.docx) on the Elevation Documentation page <http://geodata.vermont.gov/pages/elevation#documentation>.

Lineage:

Source_Information:

Source_Citation:

Citation_Information:

Originator:

VCGI. NOTE: Refer to Lineage of source data metadata for 'collection' level lineage information: 1) ElevationDEM_DEM0p7M for ASPECT, HILSHD & SLOPE derivatives; and 2) ElevationOther_DSM0p7M for nDSM derivative.

Publication_Date: 20180209

Publication_Time:

Title: ElevationOther_nDSM

Geospatial_Data_Presentation_Form: raster digital data

Publication_Information:

Publication_Place:

Publisher: 3D Elevation Program (3DEP)

Source_Scale_Denominator:

Type_of_Source_Media: download & web services

Source_Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20141108

Ending_Date: 20150417

Source_Currentness_Reference: Publication Date

Source_Citation_Abbreviation:

Source_Contribution:

Process_Step:

Process_Description:

Input ElevationDEM_DEM<RESCLASS> or ElevationOther_DSM<RESCLASS> into the ArcGIS MINUS command to create this data layer.

Process_Date: 6/13/2017

Process_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Mike Brouillette

Contact_Organization: VCGI

Process_Step:

Process_Description:

Updated metadata format and content and tasked DBA to load into VT Open Geodata Portal

Process_Date: 2/9/2018

Process_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Mike Brouillette

Contact_Organization: VCGI

Process_Step:

Process_Description:

Loaded data into Vermont Geographic Information System (VGIS) warehouse.

Process_Date: 2/12/2018

Process_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Ivan Brown

Contact_Organization: VCGI

Process_Step:

Process_Description:

Updated metadata with reference to internal VCGI report (VT Lidar DSM and nDSM Datasets – Impact Assessment of “Out-of-Range” Data Points.docx available on Elevation Documentation page <http://geodata.vermont.gov/pages/elevation#documentation>.

Process_Date: 07/30/2020

Process_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Mike Brouillette

Contact_Organization: VCGI

Spatial_Data_Organization_Information:

Indirect_Spatial_Reference: Raster

Direct_Spatial_Reference_Method: Raster

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Grid_Coordinate_System:

Grid_Coordinate_System_Name: State Plane Coordinate System

State_Plane_Coordinate_System:

SPCS_Zone_Identifier: 4400

Transverse_Mercator:

Scale_Factor_at_Central_Meridian: 0.999964

Longitude_of_Central_Meridian: -72.500000

False_Easting: 500000.000000

False_Northing: 0.000000

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: coordinate pair

Coordinate_Representation:

Abscissa_Resolution: 0.001

Ordinate_Resolution: 0.001

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

Denominator_of_Flattening_Ratio: 1 / 298.25722210

Vertical_Coordinate_System_Definition:

Altitude_System_Definition:

Altitude_Datum_Name: North American Vertical Datum of 1988

Altitude_Resolution: 0.01

Altitude_Distance_Units: meters

Altitude_Encoding_Method:

Explicit elevation coordinate included with horizontal coordinates

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: raster attributes

Attribute:

Attribute_Label: ObjectID

Attribute_Definition: Internal feature number.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain:

Sequential unique whole numbers that are automatically generated.

Attribute:

Attribute_Label: Value

Attribute_Definition: Elevation in Meters

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -510.4

Range_Domain_Maximum: 624.3

Attribute_Units_of_Measure: Meters

Overview_Description:

Entity_and_Attribute_Overview:

The values of the output raster represent the feature height above ground, not above sea level, with vertical units in meters.

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: VT Center for Geographic Information

Contact_Address:

Address_Type: Mailing and Physical Address

Address: 1 National Life Dr, Dewey Building, 2nd Floor

City: Montpelier

State_or_Province: VT

Postal_Code: 05620-2001

Country: USA

Contact_Voice_Telephone: (802) 585-0820

Contact_TDD/TTY_Telephone: None

Contact_Facsimile_Telephone:

Contact_Electronic_Mail_Address: vcgi@vermont.gov

Hours_of_Service: 9am - 5pm, M-F

Resource_Description: ElevationOther_nDSM0p7M2014

Distribution_Liability:

VCGI and the State of Vermont make no representations of any kind, including but not limited to the warranties of merchantability or fitness for a particular use, nor are any such warranties to be implied with respect to the data.

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Format_Name: ERDAS Imagine *.img format

Format_Specification: ERDAS Imagine

Format_Information_Content: geospatial data

File_Decompression_Technique: Image viewer

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name:

https://maps.vcgi.vermont.gov/gisdata/vcgi/lidar/0_7M/2014/nDSM/

Access_Instructions:

Download compressed (ERDAS Imagine) from web site. Uncompressed Imagine datasets available on offline media.

Offline_Option:

Offline_Media: USB drive

Fees:

No charge when downloading compressed (ERDAS Imagine) from the internet, and when no custom processing is required. Charge for offline media options (uncompressed GeoTIFF).

Ordering_Instructions: Send an email describing data request to vcgi@vermont.gov

Turnaround: About 5 days.

Custom_Order_Process: Send an email describing data request to vcgi@vermont.gov

Technical_Prerequisites: GIS Software

Available_Time_Period:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 20180209

Time_of_Day: Unknown

Metadata_Reference_Information:

Metadata_Date: 20200730

Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: VT Center for Geographic Information

Contact_Person: GIS Database Administrator

Contact_Address:

Address_Type: Mailing and Physical Address

Address: 1 National Life Dr, Dewey Building, 2nd Floor

City: Montpelier

State_or_Province: VT

Postal_Code: 05620-2001

Country: USA

Contact_Voice_Telephone: (802) 585-0820

Contact_TDD/TTY_Telephone: None

Contact_Facsimile_Telephone:

Metadata_Standard_Name: FGDC Content Standards for Digital Metadata

Metadata_Standard_Version: FGDC-STD-001-1998

Metadata_Time_Convention: Local time

Metadata_Access_Constraints: None

Metadata_Use_Constraints: None

Metadata_Security_Information:

Metadata_Security_Classification_System: N/A

Metadata_Security_Classification: Unclassified

Metadata_Security_Handling_Description: No security considerations