Identification_Information: Citation: Citation_Information: Originator: Gaia Geo-Analytical in collaboration with Davey Jones Locker GIS Laboratory, Oregon State Universtiy for Coral Reef Ecosystem Division, NOAA Pacific Islands Fisheries Science Center, Pacific Islands Benthic Habitat Mapping Center Publication_Date: 20110210 Title: Coverage map showing source of bathymetry data, from mosaic of gridded multibeam bathymetrty, lidar bathymetry, and bathymetry derived from multispectral IKONOS satellite imagery of Saipan Island, Commonwealth of Northern Maraina Islands, USA Geospatial_Data_Presentation_Form: raster digital data Online_Linkage: http://www.soest.hawaii.edu/pibhmc/ Online_Linkage: http://soest.hawaii.edu/pibhmc/pibhmc_cnmi_sai_bathy.htm Description: Abstract: Bathymetry is derived from gridded multibeam bathymetry, integrated with gridded lidar bathymetry and bathymetry derived from multispectral IKONOS satellite data. Gridded (5 m cell size) multibeam bathymetry were collected aboard NOAA Ship Hiialaka'i and R/V AHI. Lidar bathymetry were collected by the Naval Oceanographic Office. Bathymetry values shallower than 25 m were derived by gauging the reletive attenuation of blue and green spectral radiance as a function of depth. A multiple linear regression analysis of linearized blue and green band spectral values against depth determined the variables of y-intercept, blue slope and green slope values. Variables then used in multivariate slope intercept formula to derive depth. Variables were adjusted to improve the statistical accuracy and spatial coverage of the final derived bathymetry product. Digital image processing to derive depths conducted with the ENVI 4.5 software program while data editing and integration was performed using ArcGIS 9.3. This dataset is for the shelf environment of Saipan Island, Commonwealth of Northern Mariana Islands, USA Purpose: 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 integration of derived bathymetry with multibeam sonar data provides a GIS layer with expanded spatial coverage that may be used for benthic and essential fish habitat characterization, and for the study of geologic features. By combining the dataset with other bathymetry, backscatter, derivatives, and in situ data, they collectively compose benthic habitat maps designed to be used to understand and predict shallow depth (0m to 150m) benthic habitats for organisms that inhabit coral reef ecosystems. Supplemental_Information: Gridded multibeam data were collected aboard the Hi'ialakai, a 218’ United States National Oceanographic and Atmospheric Administration (NOAA) research ship, and aboard the R/V AHI (Acoustic Habitat Investigator), a 25’ survey launch owned and operated by the NOAA Pacific Islands Fisheries Science Center in Honolulu, HI. The metadata for the bathymetry is documented in the product metadata, saipan_5m.txt http://www.soest.hawaii.edu/pibhmc/pibhmc_cnmi_sai.htm Lidar data were provided by the Naval Oceanographic Office, and were obtained using a SHOALS airborne system during January-March 2001. Original IKONOS imagery was purchased to support the Pacific Islands Geographic Information System (GIS) project and National Ocean Service's (NOS) coral mapping activities. Orthographically corrected IKONOS Imagery was provided by NOAA's National Centers for Coastal Ocean Science, Center for Coastal Monitoring and Assessment. The metadata for this IKONOS imagery is documented in the original product metadata, po_108479_metadata.txt, po_113126_metadata.txt and po_83075_metadata.txt. http://www.soest.hawaii.edu/pibhmc Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20010309 Ending_Date: 20070608 Currentness_Reference: ground condition Status: Progress: Complete Maintenance_and_Update_Frequency: As needed Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: 145.669426 East_Bounding_Coordinate: 145.834061 North_Bounding_Coordinate: 15.291917 South_Bounding_Coordinate: 15.088395 Keywords: Theme: Theme_Keyword_Thesaurus: CoRIS Theme Keyword Thesaurus Theme_Keyword: EARTH SCIENCE > Oceans > Bathymetry/Seafloor Topography > Bathymetry Theme: Theme_Keyword_Thesaurus: CoRIS Theme Keyword Thesaurus Theme_Keyword: EARTH SCIENCE > Oceans > Bathymetry/Seafloor Topography > Water Depth Theme: Theme_Keyword_Thesaurus: CoRIS Theme Keyword Thesaurus Theme_Keyword: EARTH SCIENCE > Biosphere > Zoology > Corals > Reef Monitoring and Assessment > Remote Sensing > Satellite (digital scans) > IKONOS Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: Slope Theme_Keyword: Bathymetry Theme_Keyword: Multibeam sonar Place: Place_Keyword_Thesaurus: None Place_Keyword: Saipan Island Place_Keyword: Commonwealth of Northern Mariana Islands Place_Keyword: United States of America Place: Place_Keyword_Thesaurus: CoRIS Place Thesaurus Place_Keyword: OCEAN BASIN > Pacific Ocean > Western Pacific Ocean > Saipan Island > Saipan Island (15N145E0002) Place: Place_Keyword_Thesaurus: CoRIS Place Thesaurus Place_Keyword: COUNTRY/TERRITORY > Northern Mariana Islands > Saipan > Saipan Island (15N145E0002) Place_Keyword: COUNTRY/TERRITORY > United States of America > Hawaii > Honolulu (28N165W0001) Access_Constraints: None Use_Constraints: These data are not to be used for navigation purposes. Please acknowledge NOAA Pacific Islands Fisheries Science Center (PIFSC) Coral Reef Ecosystem Division (CRED), the Joint Institute for Marine and Atmospheric Research (JIMAR) University of Hawaii, Davey Jones Locker GIS Laboratory Oregon State University, and the Naval Oceanographic Office (NAVO) as the sources of this information. Point_of_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: Pacific Islands Benthic Habitat Mapping Center (PIBHMC), Coral Reef Ecosystem Division (CRED), Pacific Islands Fisheries Science Center (PIFSC), NOAA National Marine Fisheries Service (NMFS) Contact_Address: Address_Type: mailing and physical Address: 1680 East-West Road POST 833 City: Honolulu State_or_Province: HI Postal_Code: 96822 Country: USA Contact_Voice_Telephone: 808-956-5239 Contact_Electronic_Mail_Address: pibhmc@soest.hawaii.edu Contact_Instructions: e-mail preferred Browse_Graphic: Browse_Graphic_File_Name: ftp://ftp.soest.hawaii.edu/pibhmc/website/data/cnmi-guam/bathymetry/sai_bathymetry_all.pdf Browse_Graphic_File_Description: Gridded Bathymetry Browse_Graphic_File_Type: PDF Data_Set_Credit: NOAA PIFSC CRED, PIBHMC, NAVO, Davey Jones Locker GIS Laboratory Oregon State University Native_Data_Set_Environment: ArcGIS ASCII file or ArcGIS Grid file, bathymetry derived from 4x4m multispectral satellite imagery (IKONOS) using ENVI 4.5, derived bathymetry integrated using ArcGIS 9.3 Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: 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. Logical_Consistency_Report: These data are believed to be logically consistent though no tests were performed Completeness_Report: Complete Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: Horizontal positioning system: GPS C/A Horizontal position accuracy: 25 meters Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: Range resolution of sonar: varies with depth Raw sounding resolution: varies with depth Vertical accuracy of gridded sonar product: ~ 1% of water depth Vertical accuracy of derived bathymetry product: 5 meter range Lineage: Process_Step: Process_Date: 20090707 Process_Description: Multiple tools in ENVI 4.5 were used to complete the following processing steps: Data conversion from digital number to radiance, correction for atmosphere and water surface reflection, linearization of spectral decay as function of depth, masking of non-applicable values, and bathymetric derivation using variables from multiple linear regression analysis. Multiple tools in ArcGIS 9.3 were used for dataset integration and to extract values for the multiple linear regression analysis and subsequent error analyses. The statisitcs program S-Plus was used for the multiple linear regression analysis to provide original variables for depth derivation. The multivariate slope intercept formula used to derive depth was Depth=Yint+(Mblue)(Xblue)+(Mgreen)(Xgreen). Sixteen derived products, six from the image saipan_075_msi_000.pix (Sai07500), five from the image saipan_126_msi_000.pix (Sai12600), four from the image saipan_479_msi_000.pix (Sai47900) and five from the image saipan_479_msi_001.pix (Sai47901), were integrated to expand spatial coverage. The original MLR variables for Sai07500 were Yint=-5.1796, Mblue=-14.7510, and Mgreen=17.0081. The product derived from these variables (Sai07500_DB) was mosaiced with five additional products derived using increasingly reduced Y-intercept values as follows: Yint=-6.1796 (Sai07500_DB1), Yint=-7.1796 (Sai07500_DB2), Yint=-8.1796 (Sai07500_DB3), Yint=-9.1796 (Sai07500_DB4), Yint=-10.1796 (Sai07500_DB5). This was done to increase coverage in shallow areas. More information on this integration process is provided in the product error analysis, availble from PIBHMC upon request. The original MLR variables for Sai12600 were Yint=10.7316, Mblue=-13.0256, and Mgreen=29.0495. The product derived from these variables (Sai12600_DB) was the only product derived from this image. More information on the treatment of this product is provided in the product error analysis, availble from PIBHMC upon request. The original MLR variables for Sai47900 were Yint=4.2506, Mblue=-17.2381, and Mgreen=30.5051. The product derived from these variables (Sai47900_DB) was mosaiced with three additional products derived using increasingly reduced Y-intercept values as follows: Yint=0.2506 (Sai47900_DB4), Yint=-3.7494 (Sai47900_DB8) and Yint=-7.7494 (Sai47900_DB12). This was done to increase coverage in shallow areas. More information on this integration process is provided in the product error analysis, availble from PIBHMC upon request. The original MLR variables for Sai47901 were Yint=16.0489, Mblue=-8.1726, and Mgreen=21.6609. The product derived from these variables (Sai47901_DB) was mosaiced with four additional products derived using increasingly reduced Y-intercept values as follows: Yint=12.0489 (Sai47901_DB4), Yint=8.0489 (Sai47901_DB8), Yint=4.0489 (Sai47901_DB12), Yint=0.0489 (Sai47901_DB16). This was done to increase coverage in shallow areas. More information on this integration process is provided in the product error analysis, availble from PIBHMC upon request. The derived bathymetry from each image were in turn mosaiced averaging the the concurrent data from image Sai07500 and Sai12600 (once it was trimmed) to minimize seams in the area of overlap. Data from this combined grid was prioritized below that from Sai47901 and data from Sai47900 received the highest priority. Data with better statistical accuracy was given higher "priority" so that they replaced concurrent data with lower accuracy during the mosaic process. This mosaiced derived bathymetry product (Sai_DBall) was then resampled to a 5 meter grid and integrated with the multibeam sonar data and LiDAR data, with sonar data prioritized over the LiDAR data and with the derived data given lowest priorty, to create the final product (Sai_MB_Li_DB). A detailed description of all processing steps is available at: http://oregonstate.edu/~hogrefek/Cookbook/Cookbook_042108.pdf An error analysis of each derived bathymetry grid used is available upon request. Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Raster Raster_Object_Information: Raster_Object_Type: Grid Cell Row_Count: 5604 Column_Count: 4390 Vertical_Count: 1 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: row and column Coordinate_Representation: Abscissa_Resolution: 4.000000 Ordinate_Resolution: 4.000000 Planar_Distance_Units: meters Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 55 Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.999600 Longitude_of_Central_Meridian: 147.000000 Latitude_of_Projection_Origin: 0.000000 False_Easting: 500000.000000 False_Northing: 0.000000 Geodetic_Model: Horizontal_Datum_Name: D_WGS_1984 Ellipsoid_Name: WGS_1984 Semi-major_Axis: 6378137.000000 Denominator_of_Flattening_Ratio: 298.257224 Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: Pacific Islands Benthic Habitat Mapping Center (PIBHMC), Coral Reef Ecosystem Division (CRED), Pacific Islands Fisheries Sciences Center (PIFSC), NOAA National Marine Fisheries Service (NMFS) Contact_Address: Address_Type: mailing and physical Address: 1680 East-West Road POST 833 City: Honolulu State_or_Province: HI Postal_Code: 96822 Country: USA Contact_Voice_Telephone: 808-956-5239 Contact_Electronic_Mail_Address:pibhmc@soest.hawaii.edu Contact_Instructions: e-mail preferred Resource_Description: Downloadable Data Distribution_Liability: 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. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: Arc Grid Format_Information_Content: Arc Grid can be opened directly using ArcMap or ArcCatalog. Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://www.soest.hawaii.edu/pibhmc Fees: None Metadata_Reference_Information: Metadata_Date: 20110210 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: Pacific Islands Benthic Habitat Mapping Center (PIBHMC), Coral Reef Ecosystem Division (CRED), Pacific Islands Fisheries Sciences Center (PIFSC), NOAA National Marine Fisheries Service (NMFS) Contact_Address: Address_Type: mailing and physical Address: 1680 East-West Road POST 833 City: Honolulu State_or_Province: HI Postal_Code: 96822 Country: USA Contact_Voice_Telephone: 808-956-5239 Contact_Electronic_Mail_Address:pibhmc@soest.hawaii.edu Contact_Instructions: e-mail preferred Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Time_Convention: Universal Time Metadata_Access_Constraints: None Metadata_Use_Constraints: None