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Satellite View of Hawaii

Metadata also available as - [Outline] - [Parseable text] - [XML] - [DIF]

Frequently-anticipated questions:


What does this data set describe?

Title: Satellite View of Hawaii
Abstract:
The Satellite View of Hawaii map layer is a 200-meter-resolution simulated-natural-color image of Hawaii. Vegetation is generally green, with forests in darker green and grasslands or pasture in lighter green. Areas of volcanic rock and soil are represented by shades of brown. The image was produced by combining Landsat Thematic Mapper(TM) imagery from the Landsat 4 and Landsat 5 satellites.
Supplemental_Information:
Landsat 4 and Landsat 5 satellites carry sensors that detect reflected or emitted energy from the Earth in the visible and near-infrared wavelengths of the electromagnetic spectrum. The sensors operate in seven spectral bands. For more information on the Landsat satellites, see the Landsat Fact Sheet at <http://erg.usgs.gov/isb/pubs/factsheets/fs02303.html>.

The associated world file is included as part of the GeoTIFF. The contents of the world file are:

200.0000
0.000000
0.000000
-200.0000
-5986900.0000
-332100.0000
The following projection file can be used when using ESRI's ArcGIS to view the GeoTIFF (any line breaks should be removed): PROJCS["NAD_1983_Lambert_Azimuthal_Equal_Area",GEOGCS ["GCS_Sphere_ARC_INFO",DATUM["D_Sphere_ARC_INFO",SPHEROID ["Sphere_ARC_INFO",6370997.0,0.0]],PRIMEM["Greenwich",0.0], UNIT["Degree",0.0174532925199433]],PROJECTION ["Lambert_Azimuthal_Equal_Area"],PARAMETER["False_Easting",0.0], PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian", -100.0],PARAMETER["Latitude_Of_Origin",45.0],UNIT["Meter",1.0]]

The land/water mask used to clip the image is available on request. Please contact the National Atlas at atlasmail@usgs.gov for more information.

  1. How should this data set be cited?

    National Atlas of the United States, 200603, Satellite View of Hawaii: National Atlas of the United States, Reston, VA.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -163
    East_Bounding_Coordinate: -152
    North_Bounding_Coordinate: 26
    South_Bounding_Coordinate: 15

  3. What does it look like?

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

    Beginning_Date: 1987
    Ending_Date: 1993
    Currentness_Reference: Primary dates of the Landsat data

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

    Geospatial_Data_Presentation_Form: Raster digital data

  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 4280 x 3745, type Grid cell

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

      The map projection used is Lambert Azimuthal Equal Area.

      Projection parameters:
      Longitude_of_Projection_Center: -100.00
      Latitude_of_Projection_Center: 45.00
      False_Easting: 0.0
      False_Northing: 0.0

      Planar coordinates are encoded using Row and column
      Abscissae (x-coordinates) are specified to the nearest 200.000
      Ordinates (y-coordinates) are specified to the nearest 200.000
      Planar coordinates are specified in Meters

      The horizontal datum used is None.
      The ellipsoid used is Sphere.
      The semi-major axis of the ellipsoid used is 6370997.0.
      The flattening of the ellipsoid used is 1/1.0.

  7. How does the data set describe geographic features?

    Satellite imagery TIFF image grid cell
    Any of the data elements in the file. (Source: U.S. Geological Survey)

    Red-green-blue values for the TIFF image of satellite imagery
    Color values for the 3 bands of the TIFF image. (Source: U.S. Geological Survey)

    Range of values
    Minimum:44
    Maximum:255


Who produced the data set?

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

    • National Atlas of the United States

  2. Who also contributed to the data set?

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

    L. Greg Matheson
    U.S. Geological Survey
    12201 Sunrise Valley Drive, MS 561
    Reston, VA 20192
    USA

    703-648-5077 (voice)
    lmatheso@usgs.gov


Why was the data set created?

The Satellite View image was developed to portray the land cover of Hawaii. The image is intended for visual purposes only. The original Landsat Thematic Mapper imagery data must be used for conducting analysis.


How was the data set created?

  1. From what previous works were the data drawn?

    Atlas-Shore (source 1 of 3)
    National Atlas of the United States, 1999, Shoreline file in Lambert Azimuthal Equal Area projection: National Atlas of the United States, Reston, VA.

    Type_of_Source_Media: Internal file
    Source_Contribution: Shoreline mask for area of coverage.

    Hawaii land/water mask (source 2 of 3)
    USGS, National Center for EROS, Unpublished material, Hawaii Land/Water Mask.

    Type_of_Source_Media: Internal file
    Source_Contribution: Spatial information

    Landsat 4-5 (source 3 of 3)
    U.S. Geological Survey, 2002, United States of America Digital Landsat Mosaics: U.S. Geological Survey, Sioux Falls, SD.

    Type_of_Source_Media: CD-ROM
    Source_Contribution: Spatial and attribute information.

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

    Date: 2004 (process 1 of 2)
    A 0/1 land/water mask was created for Hawaii using coastline data clipped from Atlas_Shore.

    Data sources used in this process:

    • Atlas_Shore

    Data sources produced in this process:

    • Hawaii land/water mask

    Date: 08-Feb-2006 (process 2 of 2)
    A 4-compact-disc set of Thematic Mapper (TM) imagery titled "United States of America Digital Landsat Mosaics" was the basis for creating the Satellite View of Hawaii. Earth Satellite Corporation, under contract to NASA and the USGS, processed the data. USGS and NASA distribute the data for unrestricted non-commercial use. The average acquisition date for the Landsat Orthorectified TM data is 1990 (+/- three years). To attain cloud-free coverage, there are a small number of patches taken from scenes from as early as 1985 and from as late as 1996.

    Images on the CDs are stored at 28.5-meter resolution in a wavelet- compressed format called MrSid. All image data on CD are in UTM projection and WGS84 datum. Each image covers the width of a UTM zone, or 6 degrees of longitude, and is 5 degrees of latitude high. All of Hawaii falls in UTM zone 4.

    The image was opened in Adobe Photoshop, with an 8x expansion factor to produce a 228-meter-resolution image, and was saved as a TIFF. A TIFF world file (.tfw) was created to accompany the image so it could be loaded into ArcInfo Grid for further processing. In ArcInfo, zero values were set to NULL so as to not influence any resampling during reprojection.

    The image was reprojected from UTM to a Lambert Azimuthal Equal-Area projection (LAZ) with a center of 100 degrees west, 45 degrees north, and an output pixel size of 200 meters. The datum for the source TM data is WGS84. For 200-meter resolution image data, there is no significant difference between WGS84 and NAD83, so the image was redefined as NAD83 to match other National Atlas map layers. The image was exported from ArcInfo using the command GRIDIMAGE.

    The LAZ image was opened in Adobe Photoshop and the file was converted from RGB format to CMY format (no black generated). Color balancing, tonal enhancements, and image sharpening procedures were performed on the CMY image. The CMY image was then converted back to RGB.

    In Adobe Photoshop, a mask was applied to set ocean water to the standard color required by the National Atlas online Map Maker, RGB value (132, 193, 255).

    The RGB image was ingested into ArcInfo's Grid module, saved as a TIFF from ArcInfo, and processed through a USGS GeoTIFF software program to create a fully-compliant GeoTIFF with valid header information.

    The datum for the Satellite View of Hawaii data is NAD83. Because there is no ellipsoidal form of the Lambert Azimuthal Equal-Area projection (LAZ), once data have been projected to LAZ they lose any datum affiliation and instead are based on a sphere with a radius of 6370997 meters. However, some commonly-used software packages will report an error if a datum is not specified, so to accommodate such software, the GeoTIFF of this map layer retains the NAD83 datum.

    Data sources used in this process:

    • Landsat 4-5
    • Hawaii land/water mask

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

    National Atlas of the United States, 200603, Satellite View of Hawaii, with Shaded Relief: National Atlas of the United States, Reston, VA.

    Online Links:

    National Atlas of the United States, 200512, Satellite View of the Conterminous United States, with Shaded Relief: National Atlas of the United States, Reston, VA.

    Online Links:

    National Atlas of the United States, 200603, Satellite View of the Conterminous United States: National Atlas of the United States, Reston, VA.

    Online Links:

    National Atlas of the United States, 200605, Satellite View of Alaska, with Shaded Relief: National Atlas of the United States, Reston, VA.

    Online Links:

    National Atlas of the United States, 200605, Satellite View of Alaska: National Atlas of the United States, Reston, VA.

    Online Links:


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

  1. How well have the observations been checked?

  2. How accurate are the geographic locations?

  3. How accurate are the heights or depths?

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

    Data completeness reflects the content of the original Landsat Thematic Mapper imagery.

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

    No tests for logical consistency have been performed on this map layer.


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:
None. Acknowledgment of the National Atlas of the United States would be appreciated in products derived from these data.

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

    Earth Science Information Center, U.S. Geological Survey
    507 National Center
    Reston, VA 20192
    USA

    1-888-ASK-USGS (1-888-275-8747) (voice)

    Contact_Instructions:
    In addition to the address above there are other ESIC offices throughout the country. A full list of these offices is at <http://ask.usgs.gov/esic_index.html>.
  2. What's the catalog number I need to order this data set?

  3. What legal disclaimers am I supposed to read?

    Although these data have been processed successfully on a computer system at the U.S. Geological Survey, no warranty expressed or implied is made by the U.S. Geological Survey regarding the utility of the data on any other system, nor shall the act of distribution constitute any such warranty. No responsibility is assumed by the U.S. Geological Survey in the use of these data.

  4. How can I download or order the data?


Who wrote the metadata?

Dates:
Last modified: 04-May-2006
Metadata author:
Peg Rawson
National Atlas of the United States
12201 Sunrise Valley Drive
Reston, VA 20192
USA

703-648-4183 (voice)
atlasmail@usgs.gov

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



 


Generated by mp version 2.8.16 on Thu May 18 15:17:44 2006