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| Geologic Studies of Coral Reef Habitats
Remote Sensing Applications to Coral Reefs: Moloka'i, Hawai'i |
Goal | Aerial Photo Mosaics | Bathymetry| Molokai Title Page
The main objective of this task was to use new and historical very high resolution aerial photographs, along with airborne lidar bathymetric data, to generate digital mosaics that are geographically registered image maps of the southern coast of Moloka'i, Hawai'i for use in not only digital analysis and information extraction, but also for the various mapping and field investigations, within the coral reef project.
Digitized historical and new aerial photography covering the southern and eastern shores of the island of Moloka'i were used to generate very high resolution digital image maps. The digital image maps have 1.0- and 0.30-meter resolutions and were generated using historical and new aerial photography with scales of 1:35K and 1:10K, respectively. The digital aerial image mosaics were geometrically controlled using a combined image containing the SHOALS lidar and USGS Digital Raster Graphics (digital topography map) files. The projection of the image maps is a UTM using Zone 4 and WGS84 ellipsoid parameters. The depth at which useful bottom features can be seen with the digitized aerial photographs is approximately 60 feet.
| Moloka'i: 1.0-meter Resolution Digital Image Maps
Photos collected during September 1993 by NOAA 1:35000 scale were used to generate the 1.0-meter resolution image map covering the entire area of study site along the southern and eastern coastal waters of Moloka'i. The resulting 1.0-meter resolution mosaic can be viewed by clicking on the thumbnail images below. (500 x 200, 75 kilobytes) |
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Digital airborne SHOALS (Scanning Hydrographic Operational Airborne Lidar Survey) bathymetry data covering the southern and eastern shores of the island of Moloka'i were collected for the USGS during April 1999 by the United States Army Corps of Engineers. The SHOALS lidar bathymetry data have a 2.0-meter footprint collected every 4.0 meters with a vertical resolution of 15 cm. The maximum water depth at which bottom features can be seen with the SHOALS bathymetry data is approximately 120 feet, compared to approximately 60 feet in the aerial photomosaics.
| Moloka'i: 1.0-meter Resolution Color-coded Bathymetry
Click on the thumbnail images below to view image maps. (500 x 200, 75 kilobytes) |
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![[Image: South Central Moloka'i Color-coded Bathymetry -- Click to zoom in]](images/bathy_map_sc.gif) | ![[Image: Southeast Moloka'i Color-coded Bathymetry -- Click to zoom in]](images/bathy_map_se.gif) |
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