Slope grid derived from gridded bathymetry of Apra Harbor, Guam U.S. Territory

Frequently anticipated questions:

• What does this data set describe?
  1. How might this data set be cited?
  2. What geographic area does the data set cover?
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
  5. What is the general form of this data set?
  6. How does the data set represent geographic features?
  7. How does the data set describe geographic features?
• Who produced the data set?
  1. Who are the originators of the data set?
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
• Why was the data set created?
• How was the data set created?
  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
  3. What similar or related data should the user be aware of?
• 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?
  5. How consistent are the relationships among the data, including topology?
• How can someone get a copy of the data set?
  1. Are there legal restrictions on access or use of the data?
  2. Who distributes the data?
  3. What's the catalog number I need to order this data set?
  4. What legal disclaimers am I supposed to read?
  5. How can I download or order the data?
• Who wrote the metadata?

What does this data set describe?

1. How might this data set be cited?
   Pacific Islands Benthic Habitat Mapping Center (PIBHMC), Coral Reef Ecosystem Division (CRED), Pacific Islands Fisheries Science Center (PIFSC), National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA), 20100901, Slope grid derived from gridded bathymetry of Apra Harbor, Guam U.S. Territory.

   Online Links:

   • http://www.soest.hawaii.edu/pibhmc
   • http://www.soest.hawaii.edu/pibhmc/pibhmc_cnmi_apra_geomorph.htm

2. What geographic area does the data set cover?

   West_Bounding_Coordinate: 144.614

   East_Bounding_Coordinate: 144.676

   North_Bounding_Coordinate: 13.464

   South_Bounding_Coordinate: 13.418

3. What does it look like?

   http://www.soest.hawaii.edu/pibhmc/CNMI_images/apra_slp_1m_445.jpg (JPG)

   Gridded Bathymetry

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

   Beginning_Date: 29-Mar-2008

   Ending_Date: 04-May-2008

   Currentness_Reference: ground condition

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 5061 x 6664 x 1, type Grid Cell
   2. What coordinate system is used to represent geographic features?
      

      Grid_Coordinate_System_Name: Universal Transverse Mercator

      Universal_Transverse_Mercator:

      UTM_Zone_Number: 55

      Transverse_Mercator:

      Scale_Factor_at_Central_Meridian: 0.9996

      Longitude_of_Central_Meridian: 147

      Latitude_of_Projection_Origin: 0

      False_Easting: 500000

      False_Northing: 0

      Planar coordinates are encoded using Row and Column
      Abscissae (x-coordinates) are specified to the nearest 1
      Ordinates (y-coordinates) are specified to the nearest 1
      Planar coordinates are specified in meters
      The horizontal datum used is D_WGS_1984.
      The ellipsoid used is WGS_1984.
      The semi-major axis of the ellipsoid used is 6378137.000000.
      The flattening of the ellipsoid used is 1/298.257224.
      
7. How does the data set describe geographic features?

   Entity_and_Attribute_Overview: none

   Entity_and_Attribute_Detail_Citation: none

Who produced the data set?

1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
   • Pacific Islands Benthic Habitat Mapping Center (PIBHMC), Coral Reef Ecosystem Division (CRED), Pacific Islands Fisheries Science Center (PIFSC), National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA)
2. Who also contributed to the data set?

   NOAA PIFSC CRED and the Pacific Islands Benthic Habitat Mapping Center, JIMAR and SOEST

3. To whom should users address questions about the data?
   Pacific Islands Benthic Habitat Mapping Center (PIBHMC), Coral Reef Ecosystem Division (CRED), Pacific Islands Fisheries Science Center (PIFSC), National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA)

   NOAA IRC

   Honolulu, HI
   

   808 725-5360 (voice)

   808 725-5429 (FAX)

   nmfs.pic.credinfo@noaa.gov

   Contact_Instructions: e-mail preferred

Why was the data set created?

The data were derived in support of NOAA Coral Reef Conservation Program goals. Goal 1 is to map all U.S. Coral Reef Ecosystems. This data set specifically addresses Objective 1 and 4: to develop high-resolution benthic maps and to characterize priority deep water reefs and associated habitats. This derivative of bathymetry provides a GIS layer that may be used for benthic and essential fish habitat characterization, and for the study of geologic features. By combining the dataset with bathymetry, backscatter, other derivatives, and in situ data, they collectively compose benthic habitat maps which are designed to be used to understand and predict moderate depth (~20m to 150m) benthic habitats for different coral reef organisms.

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: 10-Aug-2010 (process 1 of 1)

   The Spatial Analyst extension was used in ArcMap 9.x to derive slope from the gridded (1m) bathymetry. Spatial Analyst --> Surface Analysis --> Slope using the following parameters: Input surface: apra_bty_1m; Output measurement: Degree; Z factor: 1; Output cell size: 1

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

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

1. How well have the observations been checked?
   Data are collected for resource management and research purposes and are tested for internal consistency; however, no effort is made to compare these data to external references or to other published data.
2. How accurate are the geographic locations?
   Horizontal positioning system: see DAPR Horizontal position accuracy: see DAPR
3. How accurate are the heights or depths?
   Range resolution of sonar: see DAPR Raw sounding resolution: see DAPR
4. Where are the gaps in the data? What is missing?
   Complete
5. How consistent are the relationships among the observations, including topology?
   These data are believed to be logically consistent though no tests were performed

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:

These data are not to be used for navigation purposes. Please acknowledge the NOAA Pacific Islands Fisheries Science Center (PIFSC) Coral Reef Ecosystem Division (CRED) and the Pacific Islands Benthic Habitat Mapping Center, and the Joint Institute for Marine and Atmospheric Research (JIMAR) and School of Ocean and Earth Science and Technology (SOEST), University of Hawaii, the NOAA Office of Coast Survey, and the USN Fleet Survey Team as the sources of this information.

1. Who distributes the data set? (Distributor 1 of 1)
   
   Pacific Islands Benthic Habitat Mapping Center (PIBHMC), Coral Reef Ecosystem Division (CRED), Pacific Islands Fisheries Science Center (PIFSC), National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA)

   NOAA IRC

   Honolulu, HI
   

   808 725-5360 (voice)

   808 725-5429 (FAX)

   nmfs.pic.credinfo@noaa.gov

   Contact_Instructions: e-mail preferred

2. What's the catalog number I need to order this data set? Downloadable Data
3. What legal disclaimers am I supposed to read?

   These data are not to be used for navigational purposes. NOAA makes no warranty regarding these data, expressed or implied, nor does the fact of distribution constitute such a warranty. NOAA cannot assume liability for any damages caused by any errors or omissions in these data, nor as a result of the failure of these data to function on a particular system.

4. How can I download or order the data?
   • Availability in digital form:

     Data format:	Arc ASCII can be converted to Arc Raster using ArcToolbox Conversion Tools (ASCIItoRaster). in format Arc ASCII
     Network links:	ftp://ftp.soest.hawaii.edu/pibhmc/website/data/cnmi-guam/benthichabitatlayers/apra_slp_1m.zip

   • Cost to order the data: None

Who wrote the metadata?

Dates:

Last modified: 29-Mar-2020
Last Reviewed: 02-Dec-2010

Metadata author:

Pacific Islands Benthic Habitat Mapping Center (PIBHMC), Coral Reef Ecosystem Division (CRED), Pacific Islands Fisheries Science Center (PIFSC), National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA)

NOAA IRC

Honolulu, HI

808 725-5360 (voice)

808 725-5429 (FAX)

nmfs.pic.credinfo@noaa.gov

Contact_Instructions: e-mail preferred

Metadata standard:

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