ElevationContours_CN20T

Metadata also available as

Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: VT Center for Geographic Information, Inc.
Publication_Date: 20121212
Publication_Time: unknown
Title: ElevationContours_CN20T
Edition: 2012B
Geospatial_Data_Presentation_Form: vector digital data
Series_Information:
Series_Name:
20' contours derived from 1/3-Arc Second National Elevation Dataset (NED) using Global Mapper software.
Issue_Identification: 2012B
Publication_Information:
Publication_Place: Waterbury VT 05676
Publisher: VT Center for Geographic Information
Other_Citation_Details: Tile Structure - STATE
Description:
Abstract:
This dataset is derived from the multi-resolution National Elevation Dataset (NED), at resolutions of both 1/3 arc-second (approx. 10 meters) and in limited areas, 1/9 arc-second (approx. 3 meters). Contours derived from this data may appear to have “shifted” when compared to the 7.5 minute USGS Quad Maps, i.e., Digital Raster Graphics, for a variety of reasons: 1) The NED is a multi-resolution dataset, e.g., areas with LiDAR source data have superseded the original "quad" contours; 2) A result of the original contour vectors undergoing a NAD27 to NAD83 conversion, then the contour vector-to-raster resampling that produced the initial grid, followed by a resampling of that initial 10m grid to the 1/3 arc-second NED (~10.29m) and finally the raster-to-vector conversion yielding the current contours. VCGI extracted the Vermont portion of the NED and re-projected into Vermont State Plane Meters NAD83 (vertical units in feet). Production artifacts were filtered out of this source data prior to acquisition resulting in a much-improved base of elevation data for calculating contours, slope and hydrologic derivatives. The NED is the primary elevation data product produced and distributed by the USGS. The NED provides the best available public domain raster elevation data of the conterminous United States, Alaska, Hawaii, and territorial islands in a seamless format. The NED is derived from diverse source data, processed to a common coordinate system and unit of vertical measure. The source data are distributed in geographic coordinates in units of decimal degrees, and in conformance with the North American Datum of 1983 (NAD 83). The source elevation values are provided in units of meters, and are referenced to the North American Vertical Datum of 1988 (NAVD 88) over the conterminous United States. The NED is updated on a nominal two month cycle to integrate newly available, improved elevation source data.
Purpose:
To provide Vermont with the best available, statewide DEM and derived datasets. The NED serves as the elevation layer of The National Map, and provides basic elevation information for earth science studies and mapping applications in the United States. The data are utilized by the scientific and resource management communities for global change research, hydrologic modeling, resource monitoring, mapping and visualization applications.
Supplemental_Information:
The data obtained through The National Map Seamless Server is considered to be the "best available" data from the USGS. The range of dates for the NED 1-arc second data cover the inception date of the dataset to the date of the most recent update. Historical data and other data may be obtained by contacting Customer Service, Earth Resources Observation & Science (EROS) Center at 1-800-252-4547.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 19990201
Ending_Date: 20090201
Currentness_Reference: ground condition
Status:
Progress: In work
Maintenance_and_Update_Frequency: Quarterly
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -73.513025
East_Bounding_Coordinate: -71.439615
North_Bounding_Coordinate: 45.036356
South_Bounding_Coordinate: 42.704580
Keywords:
Theme:
Theme_Keyword_Thesaurus: National Elevation Dataset
Theme_Keyword: Contours
Theme_Keyword: NED
Theme_Keyword: National Elevation Dataset
Theme_Keyword: elevation
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
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.
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: 802/828-3383
Contact_Electronic_Mail_Address: vcgi@vermont.gov
Hours_of_Service: 9am - 5pm, M-F
Data_Set_Credit: USGS and VCGI
Security_Information:
Security_Classification_System: N/A
Security_Classification: Unclassified
Security_Handling_Description: No Security Considerations
Native_Data_Set_Environment: Arc/Info
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
The accuracy of the contour data is a function of the source data and "black box" algorithms within Global Mapper. Therefore, no attribute accuracy is readily available, nor was any conducted.
Logical_Consistency_Report:
Contours generated using Global Mapper software (this layer) was essentially identical to those generated independently using the USGS_Contour_Service (<http://topotools.cr.usgs.gov/XMLWebServices2/USGS_Contour_Service.asmx?op=getContours>).
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
Contours derived from this data may appear to have “shifted” when compared to the 7.5 minute USGS Quad Maps, i.e., Digital Raster Graphics, for a variety of reasons: 1) The NED is a multi-resolution dataset, e.g., areas with LiDAR source data have superseded the original "quad" contours; 2) A result of the original contour vectors undergoing a NAD27 to NAD83 conversion, then the contour vector-to-raster resampling that produced the initial grid, followed by a resampling of that initial 10m grid to the 1/3 arc-second NED (~10.29m) and finally the raster-to-vector conversion yielding the current contours.
Vertical_Positional_Accuracy:
Theoritically, the contour values should match the source data from which they were generated. See <http://ned.usgs.gov/downloads/documents/NED_Accuracy.pdf> for details of the methodology. The claimed vertical accuracy for 7.5 min quads (source contours for NED) is that contours have an allowable horizontal placement error of half the distance to the adjacent contours, 90% of the time.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: VCGI, Inc.
Publication_Date: 20120217
Publication_Time: unknown
Title: 20 foot contour intervals from 1/3 arc-second NED.
Geospatial_Data_Presentation_Form: vector digital data
Publication_Information:
Publication_Place: Waterbury, VT
Publisher: VCGI, Inc.
Source_Scale_Denominator: NA
Type_of_Source_Media: digital
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 20120217
Time_of_Day: Unknown
Source_Currentness_Reference: Publication Date
Source_Citation_Abbreviation: ElevationContours_CN20T
Source_Contribution: USGS
Process_Step:
Process_Description:
Using Global Mapper (v.10) software, created 20' contours from NED source 1/3 arc-seconds tiles in GCS83 projection. Exported results to shapefile (no feature layer export option), imported to Geodatabase as layer file and reprojected to VT State Plane Coordinates.
Process_Date: 20120217
Process_Time: Unknown
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Mike Brouillette
Contact_Organization: VCGI
Contact_Position: GIS Database Administrator
Process_Step:
Process_Description:
Downloaded NED tiles from "The National Map" and using ArcGIS mosaiced individual tiles into a single, master raster dataset covering the extent of Vermont plus all Watershed Boundary Dataset (WBD) subbasin boundaries that intersect the state. Converted the elevation values into WHOLE units of FEET (to support INTEGER Raster type) and reprojected (via cubic convolution option) from the GCS projection (Datum of NAD83) into Vermont State Plane Coordinates (Datum in NAD83) as a 10m resolution "Interger" type grid with an origin to the nearest hundredth, i.e., coincident with the standardized VCGI spatial domain. Whole feet elevation values supporting the Integer type output greatly reduce its size and improve related processing operations. Final grid extent then "masked" to the buffered extent of the state outlined plus a buffer of 2,000 meters. Compressed, and loaded into VGIS Data Warehouse by Mike Brouillette.
Process_Date: 20120210
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Mike Brouillette
Contact_Organization: VCGI
Process_Step:
Process_Description:
Created 4,000 by 4,000 meter tiles using Global Mapper 13 software. Then merged tiles back into one shapefile in order to improve the rendering perfomance of the data.
Process_Date: 20121212
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Christopher McManus
Contact_Organization: VCGI
Spatial_Data_Organization_Information:
Indirect_Spatial_Reference: LINE
Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Complete chain
Point_and_Vector_Object_Count: 163477
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
Ellipsoid_Name: Geodetic Reference System 80
Semi-major_Axis: 6378137
Denominator_of_Flattening_Ratio: 1 / 298.25722210
Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: ElevationContours_CN20T linear attributes
Attribute:
Attribute_Label: NAME
Attribute_Definition: Elevation value with "ft" for use in labeling.
Attribute_Definition_Source: Global Mapper software (v.10).
Attribute:
Attribute_Label: LAYER
Attribute_Definition: Major (100 ft interval) and minor (20ft interval) contours
Attribute_Definition_Source: Global Mapper software (v.10).
Attribute:
Attribute_Label: ELEVATION
Attribute_Definition: Elevation value in feet.
Attribute_Definition_Source: Global Mapper software (v.10).
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: 802/828-3383
Contact_Electronic_Mail_Address: vcgi@vermont.gov
Hours_of_Service: 9am - 5pm, M-F
Resource_Description: layername
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: SHP
Format_Specification: ESRI Shapefile format (compressed into ZIP file format)
Format_Information_Content: geospatial data
File_Decompression_Technique: ZIP extraction tool
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
<http://maps.vcgi.vermont.gov/gisdata/vcgi/packaged_zips/ElevationContours_CN20T>
Access_Instructions: Download from web site.
Offline_Option:
Offline_Media: USB drive
Fees:
No charge when downloading from the internet, and when no custom processing is required.
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: 20120217
Time_of_Day: Unknown
Metadata_Reference_Information:
Metadata_Date: 20121212
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: 802/828-3383
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
Generated by mp version 2.9.22 on Thu May 25 13:20:46 2023