Digital image mosaics of the nearshore coastal waters of Kalaeloa on the island of Moloka'i generated using aerial photographs and SHOALS airborne lidar bathymetry data

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?
   Pat S. Chavez, Jr., Isbrecht, JoAnn, Velasco, Miguel G., and Cochran, Susan A., 2016, Digital image mosaics of the nearshore coastal waters of Kalaeloa on the island of Moloka'i generated using aerial photographs and SHOALS airborne lidar bathymetry data: data release 10.5066/F7NZ85SK, U.S. Geological Survey, Coastal and Marine Geology Program, Pacific Coastal and Marine Science Center, Santa Cruz, California.

   Online Links:

   • https://doi.org/10.5066/F7NZ85SK

   This is part of the following larger work.
   Pat S. Chavez, Jr., Isbrecht, JoAnn, Velasco, Miguel G., and Cochran, Susan A., 2016, Digital image mosaics of the nearshore coastal waters of selected areas on the Hawaiian Islands of Hawai'i, Maui, Moloka'i, and O'ahu generated using aerial photographs and airborne lidar bathymetry data: data release 10.5066/F7NZ85SK, U.S. Geological Survey, Coastal and Marine Geology Program, Pacific Coastal and Marine Science Center, Santa Cruz, California.

   Online Links:

   • https://doi.org/10.5066/F7NZ85SK

2. What geographic area does the data set cover?

   West_Bounding_Coordinate: -156.875
   East_Bounding_Coordinate: -156.833
   North_Bounding_Coordinate: 21.054
   South_Bounding_Coordinate: 21.030
   

3. What does it look like?

   kalaeloa_1m_browse.jp2 (JPEG 2000)

   10x compression

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

   Beginning_Date: 1999

   Ending_Date: 2001

   Currentness_Reference:

   ground condition at time data were collected

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

   Geospatial_Data_Presentation_Form: Raster digital data set
   

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 8355 x 14451, type Pixel
   2. What coordinate system is used to represent geographic features?
      

      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:

      UTM_Zone_Number: 4
      Transverse_Mercator:

      Scale_Factor_at_Central_Meridian: 0.9996
      Longitude_of_Central_Meridian: -153
      Latitude_of_Projection_Origin: 0
      False_Easting: 0
      False_Northing: 0
      

      Planar coordinates are encoded using Coordinate Pair
      Abscissae (x-coordinates) are specified to the nearest 1.0
      Ordinates (y-coordinates) are specified to the nearest 1.0
      Planar coordinates are specified in meters
      The ellipsoid used is WGS84.
      The semi-major axis of the ellipsoid used is 6378137.
      The flattening of the ellipsoid used is 1/298.257.
      
7. How does the data set describe geographic features?

Who produced the data set?

1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
   • Pat S. Chavez, Jr.
   • JoAnn Isbrecht
   • Miguel G. Velasco
   • Susan A. Cochran
2. Who also contributed to the data set?
3. To whom should users address questions about the data?
   U.S. Geological Survey, Pacific Coastal and Marine Science Center

   Attn: Susan A. Cochran

   Geologist

   2885 Mission Street

   Santa Cruz, CA
   

   831-460-7545 (voice)

   831-427-4748 (FAX)

   scochran@usgs.gov

Why was the data set created?

The lack of geographic and thematic maps of coral reefs limits our understanding of reefs and our ability to assess change. The U.S. Geological Survey (USGS) has the capability to compile digital image mosaics that are useful for creating detailed map products. Image maps covering the shallow near-shore coastal waters have been produced for several of the main Hawaiian Islands, including Hawai'i, Maui, Moloka'i, and O'ahu and are presented in JPEG2000 (.jp2) format.

How was the data set created?

1. From what previous works were the data drawn?

   aerial (source 1 of 3)

   Air Survey Hawai'i, Inc., 2000, 1:10K natural-color aerial photographs of selected areas of the island of Moloka'i: Air Survey Hawai'i, Inc., Honolulu, HI.

   Type_of_Source_Media: paper aerial photographs
   Source_Contribution:

   Aerial photographs were digitized and used to create image mosaics

   DOQ (source 2 of 3)

   U.S. Geological Survey (USGS), 2016, EarthExplorer online database: U.S. Geological Survey (USGS), Reston, VA.

   Online Links:

   • http://earthexplorer.usgs.gov

   Type_of_Source_Media: GeoTIFF
   Source_Contribution:

   Digital orthophotoquads (DOQs) were matched and combined with lidar data to get image-to-image geometric control points on both land and within the water areas to create 'masters' with which to georeference the aerial photographs

   lidar (source 3 of 3)

   U.S. Army Corps of Engineers (USACE) Joint Airborne Lidar Bathymetry Technical Center of Expertise (JALBCTX), 2000, SHOALS lidar bathymetry data: U.S. Army Corps of Engineers (USACE), Mobile, AL.

   Online Links:

   • http://shoals.sam.usace.army.mil/

   Type_of_Source_Media: ASCII xyz data
   Source_Contribution:

   Lidar bathymetry data were used to help geometrically control the aerial photography

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

   Date: 2007 (process 1 of 2)

   Digital-image mosaics were generated by first scanning 1:10K aerial photographs at 1 foot-per-pixel (0.3048 meter-per-pixel) resolution. The individually scanned digital images were tone- and color-matched and then combined together using spatial matching. Separately, black and white digital orthophotoquads (DOQs) of the same areas were then combined with shaded-relief images generated from lidar bathymetry data. The resulting black and white shaded-relief images covering both near-shore coastal waters and on-land areas became the geometric 'masters' for the mosaics generated from the aerial photographs. The aerial-photograph mosaics were geometrically corrected to overlay the master data set by using hundreds of image-to-image geometric control points and 'slaving' the mosaic onto the DOQ-lidar master. Person who carried out this activity:
   

   U.S. Geological Survey, Western Geographic Science Center

   Attn: Miguel G. Velasco

   Geographer

   2255 N. Gemini Drive

   Flagstaff, AZ
   

   928-556-7224 (voice)

   mvelasco@usgs.gov

   Data sources used in this process:

   • all sources cited were used

   Date: 14-Oct-2021 (process 2 of 2)

   Edited metadata to correct spelling of originator names in Larger Work section. Performed minor edits to the metadata to correct typos. No data were changed. Person who carried out this activity:
   

   U.S. Geological Survey

   Attn: Susan A. Cochran

   Geologist

   2885 Mission Street

   Santa Cruz, CA
   

   831-460-7545 (voice)

   scochran@usgs.gov

3. What similar or related data should the user be aware of?
   Pat S. Chavez, Jr., 1984, U.S. Geological Survey mini image processing system (MIPS): Open-File Report 84-880, U.S. Geological Survey, Reston, VA.

   Online Links:

   • https://pubs.er.usgs.gov/publication/ofr84880

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

1. How well have the observations been checked?
   There are no attributes associated with JPEG2000 images.
2. How accurate are the geographic locations?
   A formal accuracy assessment of the horizontal positional information in the data set has not been conducted.
3. How accurate are the heights or depths?
   A formal accuracy assessment of the vertical positional information in the data set has not been conducted.
4. Where are the gaps in the data? What is missing?
   Dataset is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details.
5. How consistent are the relationships among the observations, including topology?
   No formal logical accuracy tests were conducted, nor are they applicable for these data.

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:

USGS-authored or produced data and information are in the public domain from the U.S. Government and are freely redistributable with proper metadata and source attribution. Please recognize and acknowledge the U.S. Geological Survey as the originator(s) of the dataset and in products derived from these data.

1. Who distributes the data set? (Distributor 1 of 1)
   
   U.S. Geological Survey - ScienceBase

   Denver Federal Center, Building 810, Mail Stop 302

   Denver, CO
   

   1-888-275-8747 (voice)

   sciencebase@usgs.gov
2. What's the catalog number I need to order this data set? These digital image mosaics are available in JPEG 2000 format (.jp2), along with a lower-resolution 'browse' image and associated metadata.
3. What legal disclaimers am I supposed to read?

   Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty.

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

     Data format:	jp2 images, browse graphics, and metadata files. in format JPEG (version USGS Mini Image Processing System (MIPS)) JPEG 2000 raster Size: 806
     Network links:	https://www.sciencebase.gov/catalog/file/get/57aa4273e4b05e859be091a3?name=molokai_1ft.zip

   • Cost to order the data: None.

5. What hardware or software do I need in order to use the data set?

   These data can be read by computers running Windows, Macintosh, and UNIX operating systems, all equipped with a color monitor. A PC should have an Intel® Pentium® processor or faster, Microsoft® Windows 98 or newer, and 64 MB of RAM or greater. A Macintosh should have a PowerPC® processor or faster, Mac OS software version 8.6 or newer, and 64 MB of RAM or greater. Almost any UNIX workstation can read these files. Optional software includes Geographic Information System (GIS) software, such as Esri ArcGIS®, or other image-processing software that will handle large files, such as ERDAS®, ENVI®, and Adobe Photoshop® or LizardTech® Express View.

Who wrote the metadata?

Dates:

Last modified: 14-Oct-2021

Metadata author:

U.S. Geological Survey, Pacific Coastal and Marine Science Center

Attn: Susan A. Cochran

Geologist

2885 Mission Street

Santa Cruz, CA

United States of America

831-460-7545 (voice)

scochran@usgs.gov

Metadata standard:

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