Hubbard Brook 30m DEM

Metadata also available as

Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: USDA Forest Service, Northeastern Research Station
Publication_Date: 20040624
Title: Hubbard Brook 30m DEM
Geospatial_Data_Presentation_Form: raster digital data
Publication_Information:
Publication_Place: Durham, New Hampshire
Publisher: USDA Forest Service, Northeastern Research Station
Online_Linkage: <http://www.hubbardbrook.org/research/gis/gisexe/hb30mdem.exe>
Description:
Abstract:
The 7.5-minute digital elevation model (DEM) data are digital representations of cartographic information in a raster form. The DEMs consist of an array of elevations for ground positions at regularly spaced intervals. The data are produced in 7.5- by 7.5-minute blocks from either digitized cartographic map contour overlays of a scanned National Aerial Photography Program (NAPP) photographs. The DEM data are stored as profiles with a 10- or 30-meter square grid spacing along and between each profile.

The original USGS DEM data (Mt. Kineo and Woodstock quadrangles) were merged and projected into UTM Zone 19. The resultant grid was clipped to a box surrounding the USDA Forest Service, Hubbard Brook Experimental Forest.

Purpose:
To provide the public with spatial data from the Hubbard Brook Experimental Forest for use in research and educational activities.
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: unknown
Currentness_Reference: ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: As needed
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -71.829397
East_Bounding_Coordinate: -71.661642
North_Bounding_Coordinate: 43.977538
South_Bounding_Coordinate: 43.898043
Keywords:
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: DEM
Theme_Keyword: Digital elevation model
Theme_Keyword: US Forest Service
Theme_Keyword: Digital terrain model
Theme_Keyword: Hypsography
Theme_Keyword: Altitude
Theme_Keyword: Height
Theme_Keyword: Contour
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: Hubbard Brook
Place_Keyword: New Hampshire
Access_Constraints: None
Use_Constraints: Not for legal use
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: USDA Forest Service
Contact_Person: John Campbell
Contact_Position: Ecologist
Contact_Address:
Address_Type: physical address
Address: USDA Forest Service
Address: Northeastern Research Station
Address: 271 Mast Road
City: Durham
State_or_Province: NH
Postal_Code: 03824
Country: USA
Contact_Address:
Address_Type: mailing address
Address: USDA Forest Service
Address: Northeastern Research Station
Address: Attn: John Campbell
Address: P.O. Box 640
City: Durham
State_or_Province: NH
Postal_Code: 03801
Country: USA
Contact_Voice_Telephone: (603)868-7643
Contact_Facsimile_Telephone: (603)868-7604
Contact_Electronic_Mail_Address: jlcampbell@fs.fed.us
Browse_Graphic:
Browse_Graphic_File_Name: <http://www.hubbardbrook.org/research/gis/coverages/hb30mdem.gif>
Browse_Graphic_File_Description: Hubbard Brook 30m DEM
Browse_Graphic_File_Type: GIF
Native_Data_Set_Environment:
Microsoft Windows 2000 Version 5.0 (Build 2195) Service Pack 3; ESRI ArcCatalog 8.1.0.642

Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
The accuracy of a DEM depends upon the source level of detail and the grid spacing used to sample that source. The primary limiting factor for the source level of detail is the scale of the source materials. The proper selection of grid spacing determines the level of content that may be extracted from a given source during digitization. For 7.5-minute DEMs derived from a photogrammetric source, 90 percent have a vertical accuracy of 7-meter RMSE or better and 10 percent are in the 8- to 15-meter range.
Logical_Consistency_Report:
The fidelity of the relationships encoded in the data structure of the DEM are automatically verified using a USGS software program upon completion of the data production cycle. The test verifies full compliance to the DEM specification.
Completeness_Report:
The DEM is visually inspected for completeness on a DEM view and edit system for the purpose of performing a final quality control, and, if necessary, edit of the DEM. The physical format of each digital elevation model is validated for content completeness and logical consistency, both during production quality control and prior to archiving in the National Digital Cartographic Data Base. Due to the variable orientation of the quadrilateral in relation to the Universal Transverse Mercator (UTM) projection grid, profiles that pass within the bounds of the DEM quadrilateral may be void of elevation grid points and are not represented in the DEM. This condition occurs infrequently and is always the first or last profile of the dataset. Level 2 DEM: Level 2 DEMs may contain void areas due to interruptions to contours in the source graphic or DLG. Void area elevation grid posts are assigned the value of -32,767. In addition, suspect elevation areas may exist in the DEM but are not specifically identified. Suspect areas can be located on the source graphic as a disturbed surface and are symbolized by contours overprinted with photorevised or other surface patterns.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
The horizontal accuracy of the DEM is expressed as an estimated root mean square error (RMSE). The estimate of the RMSE is based upon horizontal accuracy tests of the DEM source materials that are selected as equal to or less than the intended horizontal RMSE error of the DEM. The testing of source material horizontal accuracy is accomplished by comparing the planimetric (X and Y) coordinates of well-defined ground points with the coordinates of the same points as determined from a source of higher accuracy.
Quantitative_Horizontal_Positional_Accuracy_Assessment:
Horizontal_Positional_Accuracy_Value: 1
Horizontal_Positional_Accuracy_Explanation: meter(s)
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
The vertical RMSE statistic is used to describe the vertical accuracy of a DEM and encompasses both random and systematic errors introduced during production of the data. The RMSE is encoded in element number 5 of record C of the DEM. Accuracy is computed by a comparison of linear interpolated elevations in the DEM with corresponding known elevations. Test points are well distributed, representative of the terrain, and have true elevations with accuracies well within the DEM accuracy criteria. Acceptable test points include, in order of preference: field control, aerotriangulated test points, spot elevations, or points on contours from existing source maps with appropriate contour interval. A minimum of 28 test points per DEM is required to compute the RMSE, which is composed of a single test using 20 interior points and 8 edge points. Edge points are those which are located along, at, or near the quadrangle neatlines and are deemed by the editor to be useful to evaluating the accuracy of the edge of the DEM. Collection of test point data and comparison of the DEM with the quadrangle hypsography are conducted by the quality control units within the USGS. There are three types of DEM vertical errors: blunder, systematic, and random. These errors are reduced in magnitude by editing but cannot be completely eliminated. Blunder errors are those errors of major proportions and are easily identified and removed during interactive editing. Systematic errors are those errors that follow some fixed pattern and are introduced by data collection procedures and systems. Random errors result from unknown or accidental causes.
Quantitative_Vertical_Positional_Accuracy_Assessment:
Vertical_Positional_Accuracy_Value: 2
Vertical_Positional_Accuracy_Explanation: meter(s)
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: US Geological Survey
Publication_Date: 20010101
Title: 7.5 minute Digital Elevation Models
Edition: 1
Geospatial_Data_Presentation_Form: raster digital data
Publication_Information:
Publication_Place: Reston, VA
Publisher: US Geological Survey
Online_Linkage: <http://earthexplorer.usgs.gov>
Larger_Work_Citation:
Citation_Information:
Originator: US Geological Survey
Publication_Date: Unknown
Title: National Cartographic Database
Publication_Information:
Publication_Place: Reston, VA
Publisher: Us Geological Survey
Online_Linkage: <http://www.usgs.gov>
Source_Scale_Denominator: 24000
Type_of_Source_Media: online
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: unknown
Source_Currentness_Reference: ground condition
Source_Contribution:
The USGS DEM files profided the basic information for the Hubbard Brook DEM
Source_Information:
Source_Citation:
Citation_Information:
Originator: US Geological Survey
Publication_Date: Unknown
Title: Digital Contour Lines
Edition: 1
Geospatial_Data_Presentation_Form: map
Publication_Information:
Publication_Place: Reston, VA
Publisher: US Geological Survey
Larger_Work_Citation:
Citation_Information:
Originator: US Geological Survey
Title: National Cartographic Database
Publication_Information:
Publication_Place: Reston, VA
Publisher: US Geological Survey
Online_Linkage: <http://www.usgs.gov>
Source_Scale_Denominator: 24000
Type_of_Source_Media: magnetic tape
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 19790101
Ending_Date: Present
Source_Currentness_Reference: ground condition
Source_Citation_Abbreviation: CONTOUR-2
Source_Contribution:
Hysographic vector information which is interpolated to regular grid posts to form DEM grids in 30- by 30- meter UTM data spacing within the 7.5 minute DEM bounds.
Source_Information:
Source_Citation:
Citation_Information:
Originator: US Geological Survey
Publication_Date: Unknown
Title: Photo ID Number
Edition: 1
Geospatial_Data_Presentation_Form: remote-sensing image
Publication_Information:
Publication_Place: Reston, VA
Publisher: US Geological Survey
Other_Citation_Details: elevation values
Online_Linkage: edcwww.cr.usgts.gov/webglis
Type_of_Source_Media: transparency
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: unknown
Ending_Date: Present
Source_Currentness_Reference: ground condition
Source_Information:
Source_Citation:
Citation_Information:
Originator: US Geological Survey
Publication_Date: Unknown
Title: Project control
Geospatial_Data_Presentation_Form: map
Publication_Information:
Publication_Place: Reston, VA
Publisher: US Geological Survey
Other_Citation_Details: Ground control points
Type_of_Source_Media: magnetic tape
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: unknown
Ending_Date: Present
Source_Currentness_Reference: ground condition
Process_Step:
Process_Description:
The production procedures, instrumentation, hardware and software used in the collection of standard U. S. Geological Survey (USGS) Digital Elevation Models (DEMs) vary depending on the systems used at the contractor, cooperator or National Mapping Division (NMD) production sites. This process step describes, in general, the process used in the production of standard USGS DEM datasets.

Level 1 DEM: Level 1 DEMs are acquired photogrammetrically by manual profiling or image correlation techniques from either the National Aerial Photography Program (NAPP) or equivalent source photographs. Level 1 30-minute DEMs may be derived or resampled from Level 1 7.5- minute DEMs.

Level 2 DEM: Level 2 DEMs are produced by converting 1:24,000-scale and 1:100,000-scale hypsography digital line graph (DLG) data into DEM format or the DEMs can be generated from vector data derived from scanned raster files of USGS 1:24.000-scale or 1:100,000-scale map series contour separates.

Level 3 DEM: Level 3 DEMs are created from DLG data that has been vertically integrated with all categories of hypsography, hydrography, ridge line, break line, drain files and all vertical and horizontal control networks. The production of Level 3 DEMs requires a system of logic incorporated into the software interpolation algorithms that clearly differentiates and correctly interpolates between the various types of terrain, data densities and data distribution. Water body editing: DEM surface areas corresponding to water bodies are flattened and assigned either map specified or estimated surface elevations. Water body areas are defined as ponds, lakes, and reservoirs that exceed 0.5 inches at map scale and double line drainage that exceeds 0.25 inches at map scale. Water body shorelines are derived from either a hypsographic DLG or by interactive delineation from a 1:24,000- or 1:100,000-scale USGS map series. DEMs are verified for physical format and logical consistency.

Source_Used_Citation_Abbreviation: control1, photo1, contour1
Process_Date: 20001010

Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Raster
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Complete chain
Point_and_Vector_Object_Count: 8
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Label point
Point_and_Vector_Object_Count: 0
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains
Point_and_Vector_Object_Count: 1
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Point
Point_and_Vector_Object_Count: 45
Raster_Object_Information:
Raster_Object_Type: Grid Cell
Row_Count: 280
Column_Count: 440
Vertical_Count: 1

Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Grid_Coordinate_System:
Grid_Coordinate_System_Name: Universal Transverse Mercator
Universal_Transverse_Mercator:
UTM_Zone_Number: 19
Transverse_Mercator:
Scale_Factor_at_Central_Meridian: 0.999600
Longitude_of_Central_Meridian: -69.000000
Latitude_of_Projection_Origin: 0.000000
False_Easting: 500000.000000
False_Northing: 0.000000
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: row and column
Coordinate_Representation:
Abscissa_Resolution: 30.000000
Ordinate_Resolution: 30.000000
Planar_Distance_Units: meters
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1927
Ellipsoid_Name: Clarke 1866
Semi-major_Axis: 6378206.400000
Denominator_of_Flattening_Ratio: 294.978698

Entity_and_Attribute_Information:

Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: USDA Forest Service
Contact_Person: John Campbell
Contact_Position: Ecologist
Contact_Address:
Address_Type: mailing address
Address: USDA Forest Service
Address: Northeastern Research Station
Address: Attn: John Campbell
Address: P.O. Box 640
City: Durham
State_or_Province: NH
Postal_Code: 03824
Country: USA
Contact_Address:
Address_Type: physical address
Address: USDA Forest Service
Address: Northeastern Research Station
Address: 271 Mast Road
City: Durham
State_or_Province: NH
Postal_Code: 03824
Country: USA
Contact_Voice_Telephone: (603)868-7643
Contact_Facsimile_Telephone: (603)868-7604
Contact_Electronic_Mail_Address: jlcampbell@fs.fed.us
Distribution_Liability:
The USDA Forest Service manages resource information and derived data as a service to USDA Forest Service users of digital geographic data. The USDA Forest Service is in no way condoning or endorsing the application of these data for any given purpose. It is the sole responsibility of the user to determine whether or not the data are suitable for the intended purpose. It is also the obligation of the user to apply the data in an appropriate and conscientious manner. The USDA Forest Service provides no warranty, nor accepts any liability occurring from any incorrect, incomplete, or misleading data, or from any incorrect, incomplete, or misleading use of these data.

Much of the USDA Forest Service data are compiled, processed, and maintained with ARC/INFO software developed by the Environmental Systems Research Institute (ESRI). Much of the information presented uses conventions and terms popularized by ARC/INFO and its user community. The mention of commercial firms or products is for clarity and identification of procedures and methods only, and no endorsements are implied by the USDA Forest Service.

Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: ARCE
Format_Version_Number: ARC 8.1
Transfer_Size: 0.494
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: <http://www.hubbardbrook.org/research/gis/gis.htm>
Fees: None

Metadata_Reference_Information:
Metadata_Date: 20040624
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: USDA Forest Service
Contact_Person: John Campbell
Contact_Position: Ecologist
Contact_Address:
Address_Type: mailing address
Address: USDA Forest Service
Address: Northeastern Research Station
Address: Attn: John Campbell
Address: P.O. Box 640
City: Durham
State_or_Province: NH
Postal_Code: 03801
Country: USA
Contact_Address:
Address_Type: physical address
Address: USDA Forest Service
Address: Northeastern Research Station
Address: 271 Mast Road
City: Durham
State_or_Province: NH
Postal_Code: 03801
Country: USA
Contact_Voice_Telephone: (603)868-7643
Contact_Facsimile_Telephone: (603)868-7604
Contact_Electronic_Mail_Address: jlcampbell@fs.fed.us
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time
Metadata_Extensions:
Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>
Profile_Name: ESRI Metadata Profile
Metadata_Extensions:
Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>
Profile_Name: ESRI Metadata Profile

Generated by mp version 2.7.3 on Thu Jun 24 15:33:27 2004