2005 Hawaii IfSAR Digital Terrain Model (DTM)

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Frequently anticipated questions:


What does this data set describe?

Title: 2005 Hawaii IfSAR Digital Terrain Model (DTM)
Abstract:
Intermap DEMs populate its data store. The DEM products are generated using Intermap's STAR technology (Interferometric Synthetic Aperture Radar). The system ismounted in an aircraft. The Digital Terrain Model (DTM) data product was derived from the Digita Surface Model (DSM) using Intermap's proprietory algorithm. The DTM data for 7.5-minute by 7.5-minute units correspond to the USGS 1:24,000 scale topographic quadrangle map series for areas in the United States and throughout the world. Each tile provides full coverage with overlap into adjacent tiles. Data for locations above 56 degrees North/South are licensed in 7.5-minute by 15-minute tiles.
  1. How should this data set be cited?

    Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Coastal Services Center (CSC), and Inc., Intermap Technologies , 20060222, 2005 Hawaii IfSAR Digital Terrain Model (DTM): Digital Terrain Models Core Product Version: 1, Edit Rule Version: 1, NOAA's Ocean Service, Coastal Services Center (CSC), Charleston, SC.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -160.247
    East_Bounding_Coordinate: -154.806
    North_Bounding_Coordinate: 22.232
    South_Bounding_Coordinate: 18.874979

  3. What does it look like?

  4. Does the data set describe conditions during a particular time period?

    Beginning_Date: 16-Oct-2005
    Ending_Date: 23-Oct-2005
    Currentness_Reference:
    The above dates refer to the time of field data acquisition and therefore reflect ground conditions at that time.

  5. What is the general form of this data set?

    Geospatial_Data_Presentation_Form: Digital Elevation Model

  6. How does the data set represent geographic features?

    1. How are geographic features stored in the data set?

      This is a Raster data set. It contains the following raster data types:

      • Dimensions 3001 x 3001, type Grid Cell

    2. What coordinate system is used to represent geographic features?

      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.0000416667. Longitudes are given to the nearest 0.0000416667. Latitude and longitude values are specified in Decimal degrees.

      The horizontal datum used is NAD83.
      The ellipsoid used is GRS80.
      The semi-major axis of the ellipsoid used is 6378137.0.
      The flattening of the ellipsoid used is 1/298.257222101.

      Vertical_Coordinate_System_Definition:
      Altitude_System_Definition:
      Altitude_Datum_Name: GRS80 Ellipsoid
      Altitude_Resolution: 0.01
      Altitude_Distance_Units: meter
      Altitude_Encoding_Method: Implicit coordinate

  7. How does the data set describe geographic features?

    Nominal 5 meter posting grid cell
    The DEM is a 32 bit IEEE floating point value organized in a one-channel Band Interleaved by Line file (BIL) on a 7.5-minute by 7.5-minute geographic (lat/long) grid. The origin of the post is center center. (Source: <http://www.intermap.com/images/handbook/producthandbook.pdf>)

    Elevation value per grid cell.
    Height above GRS80 Ellipsoid. (Source: <http://www.intermap.com/images/handbook/producthandbook.pdf>)

    Range of values
    Minimum:15.385
    Maximum:155.334
    Units:meters
    Resolution:0.01

    Entity_and_Attribute_Overview:
    NEXTMap USA Block Number: 3233>Flight Segment: m3233p22s1>Flight Direction: 249.82>Pass Acquisition Start Time (includes GPS week): 137862.0446>Pass Acquisition Start Time (GPS in HH:MM:SS): 14:17:42>Pass Acquisition Start Time (UTC in HH:MM:SS): 14:17:29>Pass Acquisition End Time (includes GPS week): 138439.8596>Pass Acquisition End Time (GPS in HH:MM:SS): 14:27:19>Pass Acquisition End Time (UTC in HH:MM:SS): 14:27:6>Pass Acquisition Date: 17-Oct-05>Flight Segment: m3233p23s2>Flight Direction: 249.811>Pass Acquisition Start Time (includes GPS week): 139289.727>Pass Acquisition Start Time (GPS in HH:MM:SS): 14:41:29>Pass Acquisition Start Time (UTC in HH:MM:SS): 14:41:16>Pass Acquisition End Time (includes GPS week): 139870.6332>Pass Acquisition End Time (GPS in HH:MM:SS): 14:51:10>Pass Acquisition End Time (UTC in HH:MM:SS): 14:50:57>Pass Acquisition Date: 17-Oct-05>Flight Segment: m3233p31s2>Flight Direction: 249.896>Pass Acquisition Start Time (includes GPS week): 295575.4087>Pass Acquisition Start Time (GPS in HH:MM:SS): 10:6:15>Pass Acquisition Start Time (UTC in HH:MM:SS): 10:6:2>Pass Acquisition End Time (includes GPS week): 296227.7226>Pass Acquisition End Time (GPS in HH:MM:SS): 10:17:7>Pass Acquisition End Time (UTC in HH:MM:SS): 10:16:54>Pass Acquisition Date: 19-Oct-05>Flight Segment: m3233p32s1>Flight Direction: 249.879>Pass Acquisition Start Time (includes GPS week): 297177.1371>Pass Acquisition Start Time (GPS in HH:MM:SS): 10:32:57>Pass Acquisition Start Time (UTC in HH:MM:SS): 10:32:44>Pass Acquisition End Time (includes GPS week): 297830.0479>Pass Acquisition End Time (GPS in HH:MM:SS): 10:43:50>Pass Acquisition End Time (UTC in HH:MM:SS): 10:43:37>Pass Acquisition Date: 19-Oct-05>Base Station: HILO> Location: N 19 43 9.0308, W 155 3 9.62008> Elevation: 29.241 meters> Datum: NAD83>Base Station: MLO1> Location: N 19 32 9.28223, W 155 34 34.27776> Elevation: 3429.427 meters> Datum: NAD83>Base Station: PAH1> Location: N 19 31 4.42595, W 154 57 42.64533> Elevation: 196.736 meters> Datum: NAD83>Base Station: UPO1> Location: N 20 14 45.16625, W 155 53 1.65448> Elevation: 78.075 meters> Datum: NAD83>Intermap Processing AML Version: 1.1.3, 20031104>ISO 9001 Certification No.: A8379
    Entity_and_Attribute_Detail_Citation: <http://www.intermap.com/images/handbook/producthandbook.pdf>


Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)

  2. Who also contributed to the data set?

    This data was produced by Intermap Technologies Inc.

  3. To whom should users address questions about the data?

    Intermap Technologies Inc.
    Data Archive Manager
    400 Inverness Drive S., Suite 330
    Englewood, CO 80112-5847
    USA

    (303) 708-0955 (voice)
    (303) 708-0952 (FAX)
    info@intermap.com


Why was the data set created?

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.


How was the data set created?

  1. From what previous works were the data drawn?

  2. How were the data generated, processed, and modified?

    Date: 22-Feb-2006 (process 1 of 1)
    This DEM data product was derived using Intermap Technologie's airborne interferometric SAR data acquisition system. The flying height is 29,500 feet Above Mean Sea Level. The primary look direction is West. Areas of missing data are interpolated using continuous curvature spline over non-data areas. 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. Occurrences of non-data areas within a DEM are dependent on the look direction of the radar. Significant inland bodies of water are assigned an elevation which corresponds to the shoreline. The ocean area delineated from the Orthorectified RADAR Image (ORI) has been assigned the value -32767.

  3. What similar or related data should the user be aware of?

    Inc., Intermap Technologies , Unknown, Intermap ORI: Orthorectified Radar Image(ORI) Core Product Version: 1, Edit Rule Version: 1.

    Online Links:


How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?

    Calculation of the digital elevation model accuracy is described in theIntermap Technologies Core Product Handbook User's Guide. <http://www.intermap.com/images/handbook/producthandbook.pdf>

  2. How accurate are the geographic locations?

    All data products are 2 meters RMSE or better in areas of unobstructed flat ground.

  3. How accurate are the heights or depths?

    1 meter RMSE or better in areas of unobstructed flat ground.

  4. Where are the gaps in the data? What is missing?

    Coverage maps are provided for each area of acquisition. <http://www.intermap.com>

  5. How consistent are the relationships among the observations, including topology?

    None


How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access_Constraints: None
Use_Constraints:
Data set is not for use in litigation. While efforts have been made to ensure that these data are accurate and reliable within the state of the art, NOAA, cannot assume liability for any damages, or misrepresentations, caused by any inaccuracies in the data, or as a result of the data to be used on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty.

  1. Who distributes the data set? (Distributor 1 of 1)

    NOAA Coastal Services Center
    Clearinghouse Manager
    2234 S Hobson Ave
    Charleston, SC 29405
    USA

    843.740.1200 (voice)
    clearinghouse@noaa.gov

  2. What's the catalog number I need to order this data set?

    Offline Data

  3. What legal disclaimers am I supposed to read?

    Any conclusions drawn from the analysis of this information are not the responsibility of NOAA, the Coastal Services Center or it's partners.

  4. How can I download or order the data?


Who wrote the metadata?

Dates:
Last modified: 17-Jul-2014
Metadata author:
NOAA Coastal Services Center
Clearinghouse Manager
2234 S Hobson Ave
Charleston, SC 29405
USA

843.740.1200 (voice)
clearinghouse@noaa.gov

Metadata standard:
FGDC Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)


Generated by mp version 2.9.13 on Wed Oct 22 10:42:20 2014