U.S. Geological Survey, 2005, geo_prtbckgnd.tif - Caribbean Regional Background Imagery of the Puerto Rico Trench Featured Data, Geographic Coordinate System: Open-File Report 2005-1066, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, MA.This is part of the following larger work.
French, Christopher D. , and Christopher J. Schenk, 2004, Map Showing Geology, Oil and Gas Fields, and Geologic Provinces of the Caribbean Region: Open-file Report 97-470-K, U.S. Geological Survey, Central Energy Resources Team, Denver, Colorado, USA.
This is a Raster data set. It contains the following raster data types:
Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.000001. Longitudes are given to the nearest 0.000001. Latitude and longitude values are specified in Decimal degrees.
The horizontal datum used is D_WGS_1984.
The ellipsoid used is WGS_1984.
The semi-major axis of the ellipsoid used is 6378137.000000.
The flattening of the ellipsoid used is 1/298.257224.
Sequential unique whole numbers that are automatically generated.
Christopher D. French (USGS) and Christopher J. Schenk (USGS) for creating the source image.
The dataset was created as a means to display shaded relief information in the cartographic products for U.S. Geological Survey Open-File Report 97-470-K, Map Showing Geology, Oil and Gas Fields, and Geologic Provinces of the Caribbean Region. The image is a composite of two individual datasets: 30 arc-second topographic grid data (GTOPO30) and 1- minute bathymetric grid data (GEBCO). The image was considered suitable for this type of display at a scale of 1:2,670,000. It is provided for others who may wish to compile a mapping project in the region.
British Oceanographic Data Center, 2003, General Bathymetric Chart of the Oceans (GEBCO): General Bathymetric Chart of the Oceans 1903-2003 Centenary Edition, British Oceanographic Data Centre, Liverpool, England.
Data sources produced in this process:
Person who carried out this activity:
(508) 548-8700 x2290 (voice)
(508) 457-2310 (FAX)
Data sources produced in this process:
Original 30 arc-second global topographic (GTOPO30) data accuracy varies by location because sources are chosen on the best available for the area, and use a total of eight sources worldwide. Sources could be raster or vector, with more accuracy claimed from the raster sources. The exact source(s) of the data for the extent shown in the Caribbean region were not determined. Horizontal accuracy is considered to be no greater than the spatial resolution of 1000 meters.
The second dataset is a compilation of bathymetric data provided by the British Oceanographic Data Centre in their General Bathymetric Chart of the Oceans (GEBCO) product. A wide variety of sources and scales were used by the data provider to digitize contours for use in the 1-minute grid product. Horizontal accuracy is considered to be no greater than the spatial resolution of 2000 meters. The graphical merging process, where GEBCO 1-minute data were combined with GTOPO30 topographic data, introduced additional error through exporting to a compressed JPEG image format. The JPEG format uses a lossy compression technique to reduce file size at the sacrifice of image quality.
No elevation or depth information provided in data.
Dataset is a compilation of two published datasets which are also compilations from various sources. Accuracy depends upon the stated accuracies of original data in addition to introduced error from merging processes.
Are there legal restrictions on access or use of the data?
- Access_Constraints: None
- Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. This data set is not to be use for navigation purpose (s).
Downloadable Data: Open-file Report 2005-1066:basemap
Although the data are used by the U.S. Geological Survey, no warranty, expressed or implied, is made by the U.S. Geological Survey as to the accuracy of the data and related materials and (or) the functioning of the software. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of these data.
|Data format:||RGB dataset representing bathymetry and topography of Caribbean Region in compressed JPEG format. in format Zipped JPG Size: 0.000|
|Data format:||A web-based interactive mapping system that accesses an ArcIMS Map Service running on certmapper.cr.usgs.gov. in format Image Map Service (WorldCaribbean) (version 4.01) ArcIMS Image Map Service|
This product can be downloaded individually using any one of the digital forms or network resource name URLs above. Each of these URLs may provide access to various formats of the same product. To order the larger work such as the entire DVD-ROM the dataset may have been published on, please use the contact information provided above.
This image is available as a GEOTIFF image with an accompanying world file. To utilize this data, the user must have an image viewer, image processing or GIS software package capable of importing a GeoTIFF image.