Identification_Information Citation Citation_Information Originator: NOAA Coastal Services Center Publication_Date: 1997 Title: New Technologies for Coastal Mapping Subtitle: Hurricane Gordon Turbidity Geospatial_Data_Presentation_Form: remote-sensing image Publication_Information Publication_Place: Charleston, South Carolina Publisher: NOAA Coastal Services Center Description Abstract: These data consist of retrospective turbidity images from the period around the landfall of hurricane Gordon. This imagery was derived from the advanced very high resolution radiometer (AVHRR) sensor aboard the NOAA series polar-orbiting satellites and covers the coastal areas surrounding Florida. 6 unique turbidity images are included on the CD-ROM during the time period surrounding Gordon's landfall from November 4 to November 26, 1994. Image resolution is 1.3 km. Purpose: The purpose of these data is to provide simplified, rapid access to the conditions of turbidity before and after hurricane Gordon. These images can assist and inform marine scientists and coastal fisheries resource managers of hurricane induced changes in the overall water clarity. Supplemental_Information: The original hurricane turbidity imagery was cropped, georeferenced, navigated and registered to a continental outline (vector). Subsequently it was processed to add a landmask, reflectance scale, and annotation. The data imagery is contained in a GEOTIFF image graphics file format. The "before", "after" and "difference" views are available as JPEG image graphics files as well. The "difference" images show the change in turbidity derived from the "before" and "after" images. Also available on the CD-ROM is a freeware version of PCI Handler (one compiled and one compressed) for viewing the GEOTIFF images. The inclusion of any software does not imply endorsement. Time_Period_of_Content Time_Period_Information Range_of_Dates/Times Beginning_Date: November 4, 1994 Ending_Date: November 26, 1994 Currentness_Reference: Time and Date of AVHRR scene and ground condition Status Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain Bounding_Coordinates West_Bounding_Coordinate: 84.95452W East_Bounding_Coordinate: 78.11650W North_Bounding_Coordinate: 31.86334N South_Bounding_Coordinate: 22.72432N Coordinate_Corner_Locations: Locations are the edges of bounding coordinates not the centers Keywords Theme Theme_Keyword_Thesaurus: none Theme_Keyword: Turbidity Theme_Keyword: water reflectance Theme_Keyword: Advanced Very High Resolution Radiometer (AVHRR) Theme_Keyword: High Resolution Picture Transmission (HRPT) Theme_Keyword: remote-sensing Theme_Keyword: satellite Theme_Keyword: hurricane Theme_Keyword: coastal erosion Theme_Keyword: oceanography Theme_Keyword: ocean currents Theme_Keyword: water clarity Place Place_Keyword_Thesaurus: none Place_Keyword: United States of America Place_Keyword: South Place_Keyword: Florida Place_Keyword: Cape Canaveral Place_Keyword: Florida Bay Place_Keyword: Bahamas Place_Keyword: Haiti Place_Keyword: Georgia Place_Keyword: South Carolina Place_Keyword: North Carolina Access_Constraints: none Use_Constraints: Data set is not for use in litigation or suitable for use in navigation. Commercial use is prohibited. Point_of_Contact Contact_Organization: NOAA Coastal Services Center Contact_Person: John Brock Contact_Address Address_Type: mailing and physical Address: 2234 South Hobson Avenue City: Charleston State_or_Province: South Carolina Postal_Code: 29405-2413 Contact_Voice_Telephone: (803) 974-6200 Contact_Electronic_Mail_Address: crs@csc.noaa.gov Data_Quality_Information Attribute_Accuracy Attribute_Accuracy_Report: The accuracy of the reflectance data is currently unknown. Logical_Consistency_Report: Post processing analysis indicated all image files contained turbidity data and were consistently geo-located through hand navigation and registration to within one pixel (~ 1 km). Completeness_Report: Images in this data set were chosen based on being relatively cloud free and having good registration accuracy. A total of 24 images were processed with 6 selected for inclusion on the CD-ROM based on the above criteria. Also included is a "difference" image derived from the "before" and "after" images, highlighting changes in turbidity which resulted from hurricane Gordon. Positional_Accuracy: Horizontal_Positional_Accuracy: The grid size for all the images is 500x800 pixels. Lineage Source_Information Source_Citation Citation_Information Originator: NOAA Publication_Date: Acquisition date of actual image Title: New Technologies for Coastal Mapping Subtitle: Hurricane Gordon Turbidity Edition: NA Geospatial_Data_Presentation_Form: remote-sensing image Publication_Information Publication_Place: Silver Springs, Maryland Publisher: NOAA Source_Scale_Denominator: unknown Type_of_Source_Media: CD-ROM Source_Time_Period_of_Content Time_Period_Information Range_of_Dates/Time Calender_Date: November 4 - 26, 1994 Time_of_Day: various Source_Currentness_Reference: Dates of images Source_Citation_Abbreviation: AVHRR Source_Contribution: Sea Surface Turbidity Process_Description: The USGS program AVHRRMAP7 was used to produce turbidity maps from the AVHRR data in level 1b format. The image data were scaled into a turbidity range of 0 to 12.7 percent water reflectance (8 bit). Each image was cropped for the specific viewing area and then hand navigated to a continental outline of the coast. A raster landmask, the hurricane ground track, text annotation and the turbidity scale (color bar) were "burned" into each image. Images were converted to JPEG and TIFF format. The raster cell (pixel) values in the JPEG image are radiometrically meaningless. The colors in the image are representative of turbidity only as they relate to the turbidity scale values. The pixel values in the TIFF images are radiometrically correct. As one byte integers they represent turbidity counts from 0-255 that encompass a turbidity range of 0 to 12.7 percent (i.e., %refdiff = (DN-1)/20 ). Land is always represented as value 254 (gray) and coastline and state boundaries as 0 (black). Areas of no data are also represented as value 0 while clouds are represented by value 255 (white). In the "difference" images the coastline is represented as 255. Process_Date: 1997 Spatial_Data_Organization_Information Direct_Spatial_Reference_Method: Raster Raster_Object_Information Raster_Object_type: Pixel Row_Count: 800 Column_Count: 500 Spatial_Reference_Information Horizontal_Coordinate_System_Definition Geographic Latitude Resolution: 1.3 km Longitude Resolution: 1.3 km Geographic_Coordinate_Units: meters Map_Projection Map_Projection_Name: Albers Conical Equal Area Standard_Parallels: 20 (1st) and 45 (2nd) Longitude_of_Central_Meridian: 0 Longitude_of_Projection_Origin: -80 Latitude_of_Projection_Origin: 30 False_Easting: 0.0 False_Northing: 0.0 Geodetic_Model: unknown Horizontal_Datum_Name: unknown Ellipsoid_Name: Clark 1866 Semi-major_Axis: 6378206.4 Denominator_of_Flattening_Ratio: Unknown Entity_and_Attribute_Information Overview_Description Entity_and_Attribute_Overview: AVHRR Turbidity data Entity_and_Attribute_Detail_Citation Originator: NOAA Coastal Services Center Publication_Date: 1997 Title: New Technologies for Coastal Mapping Subtitle: Hurricane Gordon Turbidity Geospatial_Data_Presentation_Form: remote-sensing image Publication_Information Publication_Place: Charleston, South Carolina Publisher: NOAA Coastal Services Center Distribution_Information Distributor Contact_Information Contact_Organization_Primary Contact_Organization: NOAA Coastal Services Center Contact_Person: John Brock Contact_Address Address_Type: mailing and physical Address: 2234 South Hobson Avenue City: Charleston State_or_Province: South Carolina Postal_Code: 29405-2413 Contact_Voice_Telephone: (803) 974-6200 Contact_Electronic_Mail_Address: crs@csc.noaa.gov Resource_Description: CD-ROM Distribution_Liability: none Metadata_Reference_Information Metadata_Date: 19970909 Metadata_Contact Contact_Information Contact_Organization_Primary Contact_Organization: NOAA Coastal Services Center Contact_Person: John Brock Contact_Address Address_Type: mailing and physical Address: 2234 South Hobson Avenue City: Charleston State_or_Province: South Carolina Postal_Code: 29405-2413 Contact_Voice_Telephone: (803)974-6200 Contact_Electronic_Mail_Address: crs@csc.noaa.gov Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: 19940608