GLOBAL Terrain: "dsm3v1.bil"

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Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: Intermap Technologies Inc.
Publication_Date: 20010111
Title: GLOBAL Terrain: "dsm3v1.bil"
Edition: 1
Geospatial_Data_Presentation_Form: Digital Elevation Model
Series_Information:
Series_Name: GLOBAL Terrain Digital Surface Models
Issue_Identification: Version 1
Publication_Information:
Publication_Place: Englewood, CO
Publisher: Intermap Technologies Inc.
Online_Linkage: <URL:http://www.globalterrain.com>
Online_Linkage: <URL:http://www.intermaptechnologies.com>
Online_Linkage: <URL:http://www.globalterrain.com/gt.asp#Product Handbook>

Description:
Abstract:
This data set is a digital elevation model (DEM) product that populates the GLOBAL Terrain product catalog. The DEM products are generated using the Intermap STAR-3i airborne interferometric synthetic aperture radar (SAR) system mounted in a LearJet 36A aircraft.

The GLOBAL Terrain Digital Surface Model (DSM) data files are digital representations of cartographic information in a grid form. DSMs consist of a sampled array of elevations for a number of ground positions at regularly spaced intervals. These digital data files are produced by Intermap Technologies Inc.(Intermap) as part of the GLOBAL Terrain product line and are licensed in 7.5-minute tiles for areas located between 0 and 56 degrees North/South. Data for locations above 56 degrees North/South are licensed in 15-minute by 7.5-minute tiles.

GLOBAL Terrain DSM products represent the first reflective surface as illuminated by the radar. Accuracy statements are based on areas of moderate terrain. Diminished accuracies are to be expected in areas of extreme terrain and dense vegetation.

GLOBAL Terrain DSMs are produced within four classes of vertical accuracy. GTF DSMs have an accuracy of 0.5m Root Mean Square Error (RMSE) or better. GT1 DSMs have an accuracy of 1.0m RMSE or better. GT2 DSMs have an accuracy of 2.0m RMSE or better. GT3 DSMs have an accuracy of 3.0 RMSE or better. No in-scene ground control points are required for GT2 and GT3 products provided that the DGPS ground station is within 200 km of the data acquisition area. The GTF and GT1 products do require in-scene ground control.

The DSM data for 7.5-minute units correspond to the USGS 1:24,000 and 1:25,000 scale topographic quadrangle map series for available areas in the United States and throughout the world. Each 7.5-minute DSM is based on 5- by 5-meter, or 10- by 10-meter post spacing using the Universal Transverse Mercator (UTM) projection. Each 7.5- by 7.5-minute tile provides full coverage with overlap into adjacent tiles.

Purpose:
The purpose of this data set is to provide a source for current and accurate digital elevation models with vertical accuracy of between 0.5 meter and 3 meters and post spacing of 5 or 10 meters.

The DSMs are used as a fundamental layer of information in Geographic Information Systems (GIS) and Spatial Information Decision Support Systems (DSS). A number of the priority layers of spatial information recognized by the National Spatial Data Infrastructure may be derived from GLOBAL Terrain DEMs, including elevation, hydrography, slope, aspect, and shoreline delineation.

Supplemental_Information:
The STAR-3i system employs three principle technologies: X-band Horizontal -Horizontal (HH) polarized SAR, a ring laser-based inertial measurement unit (IMU), and Differential Global Positioning System (DGPS). STAR-3i was developed by the Environmental Research Institute of Michigan (ERIM) under contract to the U.S. Defense Advanced Research Projects Agency (DARPA).

The system is comprised of two X-band radar antennae that collect data simultaneously. The set of acquired data are "interfered" by a digital correlation process to extract terrain height data and geometrically correct radar images. STAR-3i uses post-processed DGPS data, together with precise inertial measurement data, to attain highly accurate positioning control. Precise terrain height and positioning data are enhanced by careful calibration of the baseline separating the two antennae.

The STAR-3i system accuracy has been independently validated by tests conducted by the U.S. Army Topographic Engineering Center, the Institute of Navigation, Stuttgart University and by NASA. A summary of test results are accessible at <URL:http://www.globalterrain.com>.

The GLOBAL Terrain folder name describes the geographic location of a tile. The GLOBAL Terrain file name encapsulates the GT processing level and the product version number. A complete explanation of the GLOBAL Terrain file name can be found in the GLOBAL Terrain Product Handbook. <URL:http://www.globalterrain.com/gt.asp#Product Handbook>.

Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20001005
Ending_Date: 20001005
Currentness_Reference:
The above dates refer to the time of field data acquisition and therefore reflect ground conditions at that time.

Status:
Progress: Complete
Maintenance_and_Update_Frequency: Ongoing

Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -149.250
East_Bounding_Coordinate: -149.000
North_Bounding_Coordinate: 70.000
South_Bounding_Coordinate: 69.875

Keywords:
Theme:
Theme_Keyword_Thesaurus: MEL_Scientific-Engineering_Field_Thesaurus
Theme_Keyword: Elevation
Theme_Keyword: Cartography
Theme_Keyword: Geodesy
Theme_Keyword: Geography
Theme_Keyword: Hypsography
Theme_Keyword: Mapping
Theme_Keyword: Photogrammetry
Theme_Keyword: Stereophotogrammetry
Theme_Keyword: Topography
Theme_Keyword: Radar
Theme_Keyword: Interferometric
Theme_Keyword: Remote
Theme_Keyword: Sensing
Theme_Keyword: SAR
Theme_Keyword: DEM
Theme_Keyword: DTM
Theme_Keyword: DSM
Theme_Keyword: ORRI
Theme_Keyword: ORI
Theme_Keyword: STAR-3i
Theme_Keyword: INSAR
Theme_Keyword: IFSAR
Theme_Keyword: IFSARE
Theme_Keyword: GEOSAR
Theme_Keyword: height
Stratum:
Stratum_Keyword_Thesaurus: MEL_Environmental_Domain_Thesaurus
Stratum_Keyword: Terrain
Stratum_Keyword: Earth
Stratum_Keyword: Surface
Stratum_Keyword: Bald
Stratum_Keyword: Ground
Stratum_Keyword: First
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: USA
Place_Keyword: Alaska
Place_Keyword: Lower
Place_Keyword: Kuparuk
Place_Keyword: Watershed
Temporal:
Temporal_Keyword_Thesaurus: None
Temporal_Keyword: 2000
Temporal_Keyword: October

Access_Constraints: Purchase
Use_Constraints: License Agreement

Point_of_Contact:
Contact_Information:
Contact_Position: Vice-President E-Business
Contact_Organization_Primary:
Contact_Organization: Intermap Technologies Inc.

Contact_Address:
Address_Type: mailing address
Address: 9785 South Maroon Circle, Suite 150
City: Englewood
State_or_Province: CO
Postal_Code: 80112-5928
Country: USA
Contact_Voice_Telephone: (303) 708-0955
Contact_Facsimile_Telephone: (303) 708-0952
Contact_Electronic_Mail_Address: <mailto:info@globalterrain.com>

Browse_Graphic:
Browse_Graphic_File_Name: <URL:dsm3thnv1.jpg>
Browse_Graphic_File_Description: Thumbnail of DSM in greyscale
Browse_Graphic_File_Type: 8 bit jpeg

Data_Set_Credit:
This data was produced by the Airborne Operations group and the GT Products group at Intermap Technologies Inc.

Security_Information:
Security_Classification_System: GLOBAL Terrain End User's License Agreement (GTEULA)
Security_Classification: License Agreement.
Security_Handling_Description:
The user agrees to read and abide by the License Agreement. Copyright Intermap Technologies Inc., 1997-2001. All rights reserved. Refer to the license document on the website. <URL:http://www.globalterrain.com/gt.asp#GT20EULA>.

Native_Data_Set_Environment:
This data is delivered on interoperable media with metadata, thumbnail images and quality control report. The data set was developed on a Sun ULTRA SPARC 2 computer system running Solaris (UNIX).

Cross_Reference:
Citation_Information:
Originator: Intermap Technologies Inc.
Publication_Date: 20010111
Title: GLOBAL Terrain: "orripv1.tif"
Edition: 1
Geospatial_Data_Presentation_Form: Orthorectified Radar Image (ORRI)
Series_Information:
Series_Name: GLOBAL Terrain Orthorectified Radar Images
Issue_Identification: Version 1
Online_Linkage: <URL:http://www.globalterrain.com>
Online_Linkage: <URL:http://www.intermaptechnologies.com>
Online_Linkage: <URL:http://www.globalterrain.com/gt.asp#Product Handbook>
Online_Linkage: <URL:orripthnv1.jpg>


Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
Calculation of the digital elevation model is described in the GT Product Handbook User's Guide. <URL:http://www.globalterrain.com/gt.asp#Product Handbook>

Logical_Consistency_Report: <URL:qcv1.pdf> contains a final Quality Control report.

Completeness_Report:
Coverage maps are provided for each area of acquisition. <URL:http://www.globalterrain.com/GTCoverage.html>

Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
All data products are 2.5 meters RMSE or better in horizontal accuracy. For details, see <URL:http://www.globalterrain.com/gt.asp#Product Handbook>.
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
GT3 data products are 3 meters RMSE or better in vertical accuracy. For details, see <URL:http://www.globalterrain.com/gt.asp#Product Handbook>.

Lineage:
Process_Step:
Process_Date: 20010111
Process_Description:
This GLOBAL Terrain DSM data product was derived using Intermap Technologies STAR-3i airborne interferometric SAR data acquisition system. The flying height is 30,000 feet Above Mean Ground. The primary look direction is West. The secondary (alternate) look direction is None. Areas of missing data are interpolated using continuous curvature spline over non-data areas. The phase unwrapper utilized is Goldstein. Most incidences of non-data areas are due to radar shadow and layover due to steep terrain. Radar shadow is a factor of the local topography. It is often found in mountainous regions and the urban canyons of built-up areas. Occurances of non-data areas within a DEM are dependent on the look direction of the radar. Significant bodies of water are assigned an elevation which corresponds to the shoreline. Areas of null data are assigned the value -32767.


Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Raster

Raster_Object_Information:
Raster_Object_Type: Grid Cell
Row_Count: 2987
Column_Count: 3401


Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Grid_Coordinate_System:
Grid_Coordinate_System_Name: Universal Transverse Mercator
Universal_Transverse_Mercator:
UTM_Zone_Number: 6
Transverse_Mercator:
Scale_Factor_at_Central_Meridian: 0.9996
Longitude_of_Central_Meridian: 147 degrees West
Latitude_of_Projection_Origin: 0
False_Easting: 500000.0 meters
False_Northing: 0.0 meters
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 5.0
Ordinate_Resolution: 5.0
Planar_Distance_Units: Meters
Geodetic_Model:
Horizontal_Datum_Name: WGS84
Ellipsoid_Name: WGS84
Semi-major_Axis: 6378206.4
Denominator_of_Flattening_Ratio: 294.98

Vertical_Coordinate_System_Definition:
Altitude_System_Definition:
Altitude_Datum_Name: Mean Sea Level (EGM96)
Altitude_Resolution: 0.01 m
Altitude_Distance_Units: meters
Altitude_Encoding_Method: Implicit coordinate


Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: 5 meter posting grid cell
Entity_Type_Definition:
The DSM is a 32 bit IEEE floating point value Big Endian organized in a one-channel binary interleaved file (BIL) on a 7.5-minute geographic (lat/long) grid in UTM projection. The origin of the pixel is center center.
Entity_Type_Definition_Source: <URL:http://www.globalterrain.com/gt.asp#Product Handbook>
Attribute:
Attribute_Label: Elevation value per grid cell.
Attribute_Definition: Height of the geoid, relative to mean sea level.
Attribute_Definition_Source: <URL:http://www.globalterrain.com/gt.asp#Product Handbook>
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 41.787
Range_Domain_Maximum: 76.649
Attribute_Units_of_Measure: meters
Attribute_Measurement_Resolution: 0.01 m
Overview_Description:
Entity_and_Attribute_Overview:
Project Information
Project Area: Lower Kuparuk Watershed Alaska
Intermap Project Number: 00241_310
Mission # (s): 310
Intermap Processing AML Version: 1.0.4, 20010302
ISO 9001 Certification No.: A8379
DEM Origin (Northeast corner)
UTM_Easting_(meters): Min. 410140 Max. 427140
UTM_Northing_(meters): Min. 7752850 Max. 7767780
Entity_and_Attribute_Detail_Citation:
<URL:http://www.globalterrain.com/gt.asp#Product Handbook>


Metadata_Reference_Information:
Metadata_Date: 20010405
Metadata_Contact:
Contact_Information:
Contact_Position: Vice-President E-Business
Contact_Organization_Primary:
Contact_Organization: Intermap Technologies Inc.
Contact_Address:
Address_Type: mailing address
Address: 9785 South Maroon Circle, Suite 150
City: Englewood
State_or_Province: CO
Postal_Code: 80112-5928
Country: USA
Contact_Voice_Telephone: (303) 708-0955
Contact_Facsimile_Telephone: (303) 708-0952
Contact_Electronic_Mail_Address: <mailto:info@globalterrain.com>

Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998


Generated by mp version 2.5.6 on Thu Apr 5 16:50:53 2001