Publication_Place: U.S. Geological Survey, Woods Hole, MA
Publisher: USGS Coastal and Marine Geology Team
Description:
Abstract:
This image is a 250m version of the composite Gulf of Mexico GLORIA sidescan
sonar mosaic.
Purpose:
This GIS overlay is a component of the U. S. Geological Survey, Woods Hole
Field Center's, Gulf of Mexico ArcView GIS database. The Gulf of Mexico
GIS database is intended to organize and display USGS held data and provide
on-line (WWW) access to the data and/or metadata.
Supplemental_Information:
The images, compos.jpg and compos.tif, have a black background surrounding
the sidescan sonar mosaic.
The images, composw.jpg and composw.tif, have a white background surrounding
the sidescan sonar mosaic. For some display purposes, these images
may be more suitable than images with a black background described above.
The Gulf of Mexico GLORIA sidescan sonar data were collected during 3 separate
field cruise
19820202 - 19820224
19850807 - 19850903
19850905 - 19850929
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 19820202
Ending_Date: 19850929
Currentness_Reference: data collection
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -96
East_Bounding_Coordinate: -82
North_Bounding_Coordinate: 29.5
South_Bounding_Coordinate: 23
Keywords:
Theme:
Theme_Keyword_Thesaurus: General
Theme_Keyword: U.S. Geological Survey
Theme_Keyword: Woods Hole Field Center
Theme_Keyword: Gulf of Mexico database
Theme_Keyword: Exclusive Economic Zone
Theme_Keyword: EEZ
Theme_Keyword: GLORIA
Theme_Keyword: sidescan sonar
Theme_Keyword: sidescan sonar mosaic
Theme_Keyword: composite mosaic
Theme_Keyword: TIFF
Theme_Keyword: TIF
Theme_Keyword: JPG
Theme_Keyword: Geologic Long-Range Inclined Asdic
Theme_Keyword: Geotiff
Theme_Keyword: GEOTIFF
Place:
Place_Keyword_Thesaurus: General
Place_Keyword: Gulf of Mexico
Place_Keyword: U.S. EEZ
Place_Keyword: U.S. Exclusive Economic Zone
Access_Constraints: None
Use_Constraints:
The U.S. Geological Survey must be reference as the originator of the dataset
in any future products or research derived from these data.
Publication_Place: U.S. Geological Survey, Reston, VA
Publisher: U.S. Geological Survey, Office of Energy and Marine Geology
Type_of_Source_Media: CD-ROM
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 19880202
Ending_Date: 19880224
Source_Currentness_Reference: data collection
Source_Citation_Abbreviation: I-1864-A,B
Source_Contribution:
Raw imagery of GLORIA data may be retrieved from this CD-ROM. The user
must note the number of pixels (samples) and lines contained in the data
set to convert the raw imagery to a useable image format. The information
can be found in the 'lbl' file associated with the image file.
Process_Step:
Process_Description:
The 16 individual 50m GLORIA GEOTIFF images for the Gulf of Mexico were
re-sampled to 250m and combined to create an overview digital mosaic of
the Gulf of Mexico. Utilizing the PCI Remote Sensing software, an empty
'pix' file was defined. This file included the maximum extents of the GLORIA
Gulf of Mexico survey area at a 250 m resolution. The images original projection
(Albers Equal Area) and datum (Clarke 1866) was used to define the new
image file. Utilizing the georeferencing information contained in the GEOTIFF
images, the individual 50 m mosaic were placed in their proper geographic
location in the new image via GCPworks. A bilinear resampling was applied
to the image pixels to create the sub-sampled GLORIA mosaic.
The compos.tif image with a black area surrounding the mosaic was processed
with Corel PhotoPaint to convert the black area to white. The black was
replaced with white using a flood fill operation. For some display purposes,
this image may be more useful than the one with a black background.
The compos.tif image with a black area surrounding the mosaic was processed
with Corel PhotoPaint to convert the black are to white. The black was
replaced with white using a flood fill operation and then converted and
saved in a JPG format. For some display purposes, this image may be more
useful than the one with a black background.
Resource_Description: compos image in either TIF or JPEG format
Distribution_Liability:
Although this derived data set and it's lineage dataset have been used
by the USGS, no warranty, expressed or implied, is made by the USGS as
to the accuracy of the data and/or related materials. The act of distribution
shall not constitute any such warranty, and no responsibility is assumed
by the USGS in the use of these data or related materials.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: TIFF
File_Decompression_Technique: No compression applied
Transfer_Size: 15696KB
Digital_Transfer_Option:
Offline_Option:
Offline_Media: CD-ROM
Recording_Capacity:
Recording_Density: 650
Recording_Density_Units: Mbytes
Recording_Format: ISO 9600
Compatibility_Information:
The user must have a system with a CD-ROM capable of reading an ISO-9660
standard CD-ROM disk. To browse the information contained on this disk,
the user must also have a current version of WWW browser available.
Digital_Form:
Digital_Transfer_Information:
Format_Name: JPEG
File_Decompression_Technique: No compression applied
Transfer_Size: 3150KB
Digital_Transfer_Option:
Offline_Option:
Offline_Media: CD-ROM
Recording_Capacity:
Recording_Density: 650
Recording_Density_Units: Mbytes
Recording_Format: ISO 9600
Compatibility_Information:
The user must have a system with a CD-ROM capable of reading an ISO-9660
standard CD-ROM disk. To browse the information contained on this disk,
the user must also have a current version of WWW browser available.
Fees: none
Technical_Prerequisites:
An image viewer, image processing or GIS software package capable of importing
a GEOTIFF or JPEG format file. If the georeferencing information cannot
be automatically imported from the image file, the user may wish to obtain
the georeferencing information contained in a separate file, compos.txt,
in the data/gloria directory.
