Identification_Information: Citation: Citation_Information: Originator: Intermap Technologies Inc. Publication_Date: 20031115 Title: "ikpa3nwmb.bil" Edition: 1 Geospatial_Data_Presentation_Form: Digital Elevation Model Series_Information: Series_Name: Digital Terrain Models Issue_Identification: Version 1 Publication_Information: Publication_Place: Englewood, CO Publisher: Intermap Technologies Inc. Online_Linkage: Online_Linkage: Description: Abstract: This data set is a digital elevation model (DEM). The DEM products are generated using the Intermap STAR-3i(Reg.) airborne interferometric synthetic aperture radar (SAR) system mounted in a LearJet 36A aircraft. The Modified Digital Terrain Model (MDTM) data files are digital representations of cartographic information in a grid form after the application of Intermap's proprietary system known as TerrainFit(Reg.) and a subsequent filtering process. TerrainFit(Reg.) removes high frequency variations found in the first reflective surface DEM. This effectively removes elevation posts of features such as manmade structures, isolated trees, etcetera that have a relatively small footprint. Having removed these features the final regular posted DTM is derived through interpolation of the remaining elevation posts. The filtering process is designed to reduce the noise level in the data. The DTM data for 7.5-minute by 18-minute units correspond to the USGS 1:63,360 scale topographic quadrangle map series for available areas in the United States. Each 7.5-minute by 18-minute DTM is based on 5m postings using the Universal Transverse Mercator (UTM) projection. Each 7.5-minute by 18-minute tile provides full coverage with overlap into adjacent tiles. Purpose: The DTMs 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 Intermap DEMs, including elevation, hydrography, slope, aspect, and shoreline delineation. Supplemental_Information: The STAR-3i(Reg.) system employs three principal technologies: X-band Horizontal -Horizontal (HH) polarized SAR, a ring laser-based inertial measurement unit (IMU), and Differential Global Positioning System (DGPS). STAR-3i(Reg.) 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(Reg.) 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(Reg.) 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 . Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20030729 Ending_Date: 20030807 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: -154.800 East_Bounding_Coordinate: -154.500 North_Bounding_Coordinate: 69.250 South_Bounding_Coordinate: 69.125 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(Reg.) 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: National Place_Keyword: Petroleum Place_Keyword: Reserve Temporal: Temporal_Keyword_Thesaurus: None Temporal_Keyword: 2003 Temporal_Keyword: July Access_Constraints: Purchase Use_Constraints: None Point_of_Contact: Contact_Information: Contact_Position: Data Archive Manager Contact_Organization_Primary: Contact_Organization: Intermap Technologies Inc. Contact_Address: Address_Type: mailing address Address: 400 Inverness Drive S., Suite 330 City: Englewood State_or_Province: CO Postal_Code: 80112-5847 Country: USA Contact_Voice_Telephone: (303) 708-0955 Contact_Facsimile_Telephone: (303) 708-0952 Contact_Electronic_Mail_Address: mailto:info@intermap.com Data_Set_Credit: This data was produced by Intermap Technologies Inc. Native_Data_Set_Environment: This data is delivered on interoperable media with metadata and a quality control report. The data set was developed on Intel Xeon processors running Microsoft Windows 2000 Server Operating System. Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: Calculation of the digital elevation model accuracy is described in the Product Handbook User's Guide. Logical_Consistency_Report: Completeness_Report: Coverage maps are provided for each area of acquisition. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: This data is derived from a DSM of an accuracy of 2.5 meters RMSE or better in areas of unobstructed flat ground. This accuracy is no longer guaranteed due to the filtering procedures. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: This data derived from a DSM of an accuracy of 1 meter RMSE or better in areas of unobstructed flat ground. This accuracy is no longer guaranteed due to the filtering procedures. Lineage: Process_Step: Process_Date: 20031115 Process_Description: This DEM data product was derived using Intermap Technologies' STAR-3i(Reg.) airborne interferometric SAR data acquisition system. The flying height is 20,000 feet Above Sea Level. The primary look direction is North. Areas of missing data are interpolated using continuous curvature spline over non-data areas. The phase unwrapper utilized is ifprocT. 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. This data was derived from the original DSM through the application of the TerrainFit(Reg.) bare earth processing system and the subsequent application of a 3X3 median filter run with four iterations. The intent in processing the DSM this way was to reduce the inherent variability within the DSM so that contours generated at a one meter interval would conform to standard cartographic expectations. This is an artificially smoothed DSM that was derived from data with a horizontal positional accuracy of 2.5m RMSE and a vertical positional accuracy of 1m RMSE. These accuracies can no longer be guaranteed given the filtering procedures. Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Raster Raster_Object_Information: Raster_Object_Type: Grid Cell Row_Count: 3040 Column_Count: 2645 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 5 Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.9996 Longitude_of_Central_Meridian: 153 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: NAD83 Ellipsoid_Name: GRS80 Semi-major_Axis: 6378137 Denominator_of_Flattening_Ratio: 298.257222101 Vertical_Coordinate_System_Definition: Altitude_System_Definition: Altitude_Datum_Name: NAVD88-Geoid99 Altitude_Resolution: 0.01 m Altitude_Distance_Units: meter 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 DEM is a 32 bit IEEE floating point value Big Endian organized in a one-channel binary interleaved file (BIL) on a 7.5-minute by 18.0-minute geographic (lat/long) grid in UTM projection. The origin of the post is center center. Entity_Type_Definition_Source: Attribute: Attribute_Label: Elevation value per grid cell. Attribute_Definition: Height of the geoid, relative to mean sea level. Attribute_Definition_Source: Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 77.682 Range_Domain_Maximum: 404.746 Attribute_Units_of_Measure: meters Attribute_Measurement_Resolution: 0.01 m Overview_Description: Entity_and_Attribute_Overview: >Project Information >NPRA3 Task Order#: 01010C0042 >Project Area: National Petroleum Reserve Alaska >Intermap Project Number: 03015 >Time of Collection >Flight Segment: m401p35s5 >Base Stations: REM1&UMI1 >Flight Direction: -88.50 >Pass Acquisition Start Time (includes GPS week): 571356.9817 >Pass Acquisition Start Time (GPS in HH:MM:SS): 14:42:37 >Pass Acquisition Start Time (UTC in HH:MM:SS): 14:42:24 >Pass Acquisition End Time (includes GPS week): 572485.7886 >Pass Acquisition End Time (GPS in HH:MM:SS): 15:01:26 >Pass Acquisition End Time (UTC in HH:MM:SS): 15:01:13 >Pass Acquisition Date: 2-Aug-03 >Flight Segment: m401p35s6 >Base Stations: REM1&UMI1 >Flight Direction: -88.50 >Pass Acquisition Start Time (includes GPS week): 571356.9817 >Pass Acquisition Start Time (GPS in HH:MM:SS): 14:42:37 >Pass Acquisition Start Time (UTC in HH:MM:SS): 14:42:24 >Pass Acquisition End Time (includes GPS week): 572485.7886 >Pass Acquisition End Time (GPS in HH:MM:SS): 15:01:26 >Pass Acquisition End Time (UTC in HH:MM:SS): 15:01:13 >Pass Acquisition Date: 2-Aug-03 >Flight Segment: m401p36s1 >Base Stations: REM1&UMI1 >Flight Direction: 90.25 >Pass Acquisition Start Time (includes GPS week): 573506.8183 >Pass Acquisition Start Time (GPS in HH:MM:SS): 15:18:27 >Pass Acquisition Start Time (UTC in HH:MM:SS): 15:18:14 >Pass Acquisition End Time (includes GPS week): 574479.567 >Pass Acquisition End Time (GPS in HH:MM:SS): 15:34:40 >Pass Acquisition End Time (UTC in HH:MM:SS): 15:34:27 >Pass Acquisition Date: 2-Aug-03 >Flight Segment: m401p36s2 >Base Stations: REM1&UMI1 >Flight Direction: 90.25 >Pass Acquisition Start Time (includes GPS week): 573506.8183 >Pass Acquisition Start Time (GPS in HH:MM:SS): 15:18:27 >Pass Acquisition Start Time (UTC in HH:MM:SS): 15:18:14 >Pass Acquisition End Time (includes GPS week): 574479.567 >Pass Acquisition End Time (GPS in HH:MM:SS): 15:34:40 >Pass Acquisition End Time (UTC in HH:MM:SS): 15:34:27 >Pass Acquisition Date: 2-Aug-03 >Flight Segment: m401p38s1 >Base Stations: REM1&UMI1 >Flight Direction: 90.00 >Pass Acquisition Start Time (includes GPS week): 577265.1852 >Pass Acquisition Start Time (GPS in HH:MM:SS): 16:21:05 >Pass Acquisition Start Time (UTC in HH:MM:SS): 16:20:52 >Pass Acquisition End Time (includes GPS week): 578073.748 >Pass Acquisition End Time (GPS in HH:MM:SS): 16:34:34 >Pass Acquisition End Time (UTC in HH:MM:SS): 16:34:21 >Pass Acquisition Date: 2-Aug-03 >Flight Segment: m401p38s2 >Base Stations: REM1&UMI1 >Flight Direction: 90.00 >Pass Acquisition Start Time (includes GPS week): 577265.1852 >Pass Acquisition Start Time (GPS in HH:MM:SS): 16:21:05 >Pass Acquisition Start Time (UTC in HH:MM:SS): 16:20:52 >Pass Acquisition End Time (includes GPS week): 578073.748 >Pass Acquisition End Time (GPS in HH:MM:SS): 16:34:34 >Pass Acquisition End Time (UTC in HH:MM:SS): 16:34:21 >Pass Acquisition Date: 2-Aug-03 >Flight Segment: m401p45s1 >Base Stations: REM1&UMI1 >Flight Direction: 88.00 >Pass Acquisition Start Time (includes GPS week): 6372.989744 >Pass Acquisition Start Time (GPS in HH:MM:SS): 1:46:13 >Pass Acquisition Start Time (UTC in HH:MM:SS): 1:46:00 >Pass Acquisition End Time (includes GPS week): 7042.396679 >Pass Acquisition End Time (GPS in HH:MM:SS): 1:57:22 >Pass Acquisition End Time (UTC in HH:MM:SS): 1:57:09 >Pass Acquisition Date: 3-Aug-03 >Flight Segment: m401p45s2 >Base Stations: REM1&UMI1 >Flight Direction: 88.00 >Pass Acquisition Start Time (includes GPS week): 6372.989744 >Pass Acquisition Start Time (GPS in HH:MM:SS): 1:46:13 >Pass Acquisition Start Time (UTC in HH:MM:SS): 1:46:00 >Pass Acquisition End Time (includes GPS week): 7042.396679 >Pass Acquisition End Time (GPS in HH:MM:SS): 1:57:22 >Pass Acquisition End Time (UTC in HH:MM:SS): 1:57:09 >Pass Acquisition Date: 3-Aug-03 >Flight Segment: m401p48s4 >Base Stations: REM1&UMI1 >Flight Direction: -88.20 >Pass Acquisition Start Time (includes GPS week): 49027.79389 >Pass Acquisition Start Time (GPS in HH:MM:SS): 13:37:08 >Pass Acquisition Start Time (UTC in HH:MM:SS): 13:36:55 >Pass Acquisition End Time (includes GPS week): 49825.77854 >Pass Acquisition End Time (GPS in HH:MM:SS): 13:50:26 >Pass Acquisition End Time (UTC in HH:MM:SS): 13:50:13 >Pass Acquisition Date: 3-Aug-03 >Intermap Processing AML Version: 1.1.3, 20031104 >ISO 9001 Certification No.: A8379 >DEM Origin (North West Corner) >UTM_Easting_(meters): 427967.5 >UTM_Northing_(meters): 7683752.5 >DEM Extents >UTM_Easting_(meters): Min. 427965 Max. 441190 >UTM_Northing_(meters): Min. 7668555 Max. 7683755 Entity_and_Attribute_Detail_Citation: Metadata_Reference_Information: Metadata_Date: 20050125 Metadata_Contact: Contact_Information: Contact_Position: Data Archive Manager Contact_Organization_Primary: Contact_Organization: Intermap Technologies Inc. Contact_Address: Address_Type: mailing address Address: 400 Inverness Drive S., Suite 330 City: Englewood State_or_Province: CO Postal_Code: 80112-5847 Country: USA Contact_Voice_Telephone: (303) 708-0955 Contact_Facsimile_Telephone: (303) 708-0952 Contact_Electronic_Mail_Address: mailto:info@intermap.com Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998