Identification_Information: Citation: Citation_Information: Originator: Valerie Paskevich Publication_Date: 200508 Title: srtm30plus-na_pctshade.tif - SRTM30PLUS color-encoded shaded relief image of North America (approximately 1km) - GeoTIFF image Edition: 1.0 Geospatial_Data_Presentation_Form: remote-sensing image Series_Information: Series_Name: Open-File Report Issue_Identification: 2005-1001 Publication_Information: Publication_Place: Woods Hole Science Center, Woods Hole, MA Publisher: U.S. Geological Survey, Coastal and Marine Geology Program Online_Linkage: http://pubs.usgs.gov/of/2005/1001/data/basemaps/srtm30plus/srtm30plus-na_pctshade.zip Online_Linkage: http://pubs.usgs.gov/of/2005/1001/htmldocs/datacatalog.htm Larger_Work_Citation: Citation_Information: Originator: L.J. Poppe Originator: S.J. Williams Originator: V.F. Paskevich Publication_Date: 2005 Title: U.S. Geological Survey East-Coast Sediment Analysis: Procedures, Database, and GIS Data Edition: 1.0 Series_Information: Series_Name: Open-File Report Issue_Identification: 2005-1001 Publication_Information: Publication_Place: Woods Hole Science Center, Woods Hole, MA Publisher: U.S. Geological Survey, Coastal and Marine Geology Program Other_Citation_Details: Publication and data are released via DVD-ROM media. This digital publication may also be available via the web at pubs.usgs.gov Online_Linkage: http://pubs.usgs.gov/of/2005/1001/ Description: Abstract: Joseph J. Becker and David T. Sandwell at the Scripps Oceanographic Institute have generated a dataset of world-wide coverage combining NASA's Shuttle Radar Topography Mission (SRTM) obtained elevation data and Smith and Sandwell global 2-minute bathymetry. This data set provides a global composite of elevation that can be utilized to create elevation/bathymetry visualization. The Shuttle Radar Topography Mission is a collaborative project between NASA, the National Imagery and Mapping Agency (NIMA), and the German and Italian space agencies to map the elevation of a large part of the globe. SRTM consisted of a specially modified radar system that flew onboard the Space Shuttle Endeavour during an 11-day mission in February of 2000. The instrument operated virtually flawlessly and imaged 99.96% of the targeted landmass at least one time, 94.59% at least twice and about 50% at least three or more times. The goal was to image each terrain segment at least twice from different angles (on ascending, or north-going, and descending orbit passes) to fill in areas shadowed from the radar beam by terrain. The 'targeted landmass' consisted of all land between 56 degrees south and 60 degrees north latitude, which comprises almost exactly 80% of the total landmass. While SRTM30 has the same resolution as GTOPO30, it can be considered a more accurate global digital data set compared to GTOPO30 because of its seamless and uniform representation, due to the fact that it was created over a short period of time from a single source rather than from the numerous sources spanning many decades that went into creating the GTOPO30 data set. This data set does not provide the high resolution SRTM elevation of the original one degree datasets. Sample spacing for the original individual data points is either 1 arc-second or 3 arc-seconds, referred to as SRTM-1 and SRTM-3, respectively. The user may visit ftp://e0mss21u.ecs.nasa.gov/srtm/ or ftp://e0mss21u.ecs.nasa.gov/srtm/ to obtain the higher resolution datasets. Purpose: This image provides a broad scale view of the world topography (elevation and bathymetry) on which other Geographic Information System (GIS) data layers may be co-located and viewed. These data are intended for science researchers, students, policy makers, and the general public. The data can be used with geographic information systems (GIS) software to display geologic and oceanographic information. Supplemental_Information: While SRTM30 has the same resolution as GTOPO30, it can be considered a more accurate global digital data set compared to GTOPO30 because of its seamless and uniform representation, due to the fact that it was created over a short period of time from a single source rather than from the numerous sources spanning many decades that went into creating the GTOPO30 data set. However, it must be noted that the SRTM30 does not cover the poles north and south of approximately 60° latitude. Therefore, data for Antarctica, for example, must be obtained from the GTOPO30 data set. Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2005 Currentness_Reference: publication date Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -180 East_Bounding_Coordinate: -30 North_Bounding_Coordinate: 90 South_Bounding_Coordinate: 0 Keywords: Theme: Theme_Keyword_Thesaurus: General Theme_Keyword: U.S. Geological Survey Theme_Keyword: USGS Theme_Keyword: Coastal and Marine Geology Program Theme_Keyword: CMGP Theme_Keyword: Woods Hole Science Center Theme_Keyword: WHSC Theme_Keyword: GeoTIFF image Theme_Keyword: color-encoded shaded relief Theme_Keyword: bathymetry Theme_Keyword: topography Theme_Keyword: SRTM30_PLUS Theme_Keyword: Shuttle Radar Topography Mission Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: oceans and estuaries Theme_Keyword: elevation Theme_Keyword: imageryBaseMapsEarthCover Place: Place_Keyword_Thesaurus: General Place_Keyword: North America Place_Keyword: United States Place_Keyword: Canada Access_Constraints: None Use_Constraints: Bathymetry is not to be used for navigational purposes. Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey (USGS) as the source of this information. All source data are derived from public domain sources and these data are also in the public domain. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Valerie Paskevich Contact_Organization: U.S. Geological Survey Contact_Position: Information Specialist, GIS Coordinator Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Road City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Country: USA Contact_Voice_Telephone: (508) 548-8700 x2281 Contact_Facsimile_Telephone: (508) 457-2310 Contact_Electronic_Mail_Address: vpaskevich@usgs.gov Browse_Graphic: Browse_Graphic_File_Name: http://pubs.usgs.gov/of/2005/1001/data/basemaps/srtm30plus/srtm30plus-na_pctshade-thumb.gif Browse_Graphic_File_Description: Thumbnail image showing extent and coverage of data layer. Browse_Graphic_File_Type: GIF Browse_Graphic: Browse_Graphic_File_Name: http://pubs.usgs.gov/of/2005/1001/data/basemaps/srtm30plus/srtm30plus-na_pctshade.gif Browse_Graphic_File_Description: Overview showing image extent and coverage of data layer. Browse_Graphic_File_Type: GIF Data_Set_Credit: Please credit Joseph J. Becker, David T. Sandwell for the compilation of the Land and Ocean data used as the source. Native_Data_Set_Environment: Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.0.0.535 Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: Elevation Data - Each SRTM data tile contains a mosaic of elevations generated by averaging all data takes that fall within that tile. Since the primary error source in synthetic aperture radar data is speckle, which has the characteristics of random noise, combining data through averaging reduces the error by the square root of the number of data takes used. In the case of SRTM the number of data takes could range from a minimum of one (in a very few cases) up to as many as ten or more. Completeness_Report: Land data are based on the 1-km averages of topography derived from the USGS SRTM30 grided DEM data product created with data from the NASA Shuttle Radar Topography Mission. GTOPO30 data are used for high latitudes where SRTM data are not available. Ocean data are based on the Smith and Sandwell global 2-minute grid between latitudes +/- 72 degrees. Higher resolution grids have been added from the LDEO Ridge Multibeam Synthesis Project and the NGDC Coastal Relief Model. Arctic bathymetry is from the International Bathymetric Chart of the Oceans (IBCAO) [Jakobsson et al., 2003]. Positional_Accuracy: Horizontal_Positional_Accuracy: Quantitative_Horizontal_Positional_Accuracy_Assessment: Horizontal_Positional_Accuracy_Value: 20 meters Horizontal_Positional_Accuracy_Explanation: circular error at 90% confidence Vertical_Positional_Accuracy: Quantitative_Vertical_Positional_Accuracy_Assessment: Vertical_Positional_Accuracy_Value: 16 meters Vertical_Positional_Accuracy_Explanation: linear error at 90% confidence Lineage: Source_Information: Source_Citation: Citation_Information: Originator: Joseph J. Becker Originator: David T. Sandwell Publication_Date: 200412 Title: SRTM30_PLUS: SRTM30, Coastal and Ridge Multibeam, Estimated Topography Edition: 0.1 Geospatial_Data_Presentation_Form: document Publication_Information: Publication_Place: La Jolla, CA Publisher: Scripps Institution of Oceanography, University of California San Diego Online_Linkage: http://topex.ucsd.edu/WWW_html/srtm30_plus.html Source_Scale_Denominator: 1:1000 Type_of_Source_Media: disc Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 200412 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: srtm30plus Source_Contribution: This data consists of 33 files binary of global topography (elevation & bathymetry; 16-bit signed values). The individual files were downloaded via the web and combined to create a single raster coverage of world coverage. The grid resolution of the source data is 30 second which is roughly one kilometer. Process_Step: Process_Description: Thirty-three zip archive files of global topography were downloaded. The files were unzipped to create raw 16-bit binary data files. Each of the thirty-three files were imported into a separate PCI Geomatics database file. Importing the files into PCI allowed the ability to swap the bytes from a 16-bit Most-Significant-Bit order (MSB: Sun/Motorola) to a 16-bit Least-Significant-Bit order (LSB: Intel/VAX). Georeferencing information were added to each of the thirty-three files. Process_Date: 20050502 Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Valerie Paskevich Contact_Organization: U.S. Geological Survey Contact_Position: Information Specialist, GIS Coordinator Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Road City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Country: USA Contact_Voice_Telephone: (508) 548-8700 x2281 Contact_Facsimile_Telephone: (508) 457-2310 Contact_Electronic_Mail_Address: vpaskevich@usgs.gov Process_Step: Process_Description: A new PCI Geomatics database file was defined to combine the global dataset. The individual thirty-three files were mosaicked to create one world view. Process_Date: 20050502 Source_Produced_Citation_Abbreviation: srtm30plus.pix Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Valerie Paskevich Contact_Organization: U.S. Geological Survey Contact_Position: Information Specialist, GIS Coordinator Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Road City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Country: USA Contact_Voice_Telephone: (508) 548-8700 x2281 Contact_Facsimile_Telephone: (508) 457-2310 Contact_Electronic_Mail_Address: vpaskevich@usgs.gov Process_Step: Process_Description: The area of interest was extracted from the composite image. This was done to reduce the overall size of the image and to retain as much detail as possible. The 16-bit signed image data was transferred to the new database. Source_Used_Citation_Abbreviation: srtm30plus.pix Process_Date: 20050504 Source_Produced_Citation_Abbreviation: srtm30plus-na.pix Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Valerie Paskevich Contact_Organization: U.S. Geological Survey Contact_Position: Information Specialist, GIS Coordinator Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Road City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Country: USA Contact_Voice_Telephone: (508) 548-8700 x2281 Contact_Facsimile_Telephone: (508) 457-2310 Contact_Electronic_Mail_Address: vpaskevich@usgs.gov Process_Step: Process_Description: Two additional 8-bit channel were added to the PCI database for future processing. The program REL was run to create an 8-bit shaded relief image based on the 16-bit signed image data. Source_Used_Citation_Abbreviation: srtm30plus-na.pix Process_Date: 20050505 Source_Produced_Citation_Abbreviation: srtm30plus-na.pix Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Valerie Paskevich Contact_Organization: U.S. Geological Survey Contact_Position: Information Specialist, GIS Coordinator Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Road City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Country: USA Contact_Voice_Telephone: (508) 548-8700 x2281 Contact_Facsimile_Telephone: (508) 457-2310 Contact_Electronic_Mail_Address: vpaskevich@usgs.gov Process_Step: Process_Description: The shaded relief image was viewed in PCI Imageworks. A linear stretch enhancement was applied to the image and the resulting Look-up Table (LUT) saved in the database. Source_Used_Citation_Abbreviation: srtm30plus-na.pix Process_Date: 20050505 Source_Produced_Citation_Abbreviation: srtm30plus-na.pix Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Valerie Paskevich Contact_Organization: U.S. Geological Survey Contact_Position: Information Specialist, GIS Coordinator Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Road City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Country: USA Contact_Voice_Telephone: (508) 548-8700 x2281 Contact_Facsimile_Telephone: (508) 457-2310 Contact_Electronic_Mail_Address: vpaskevich@usgs.gov Process_Step: Process_Description: The 8-bit shaded relief image had a linear stretch permanently applied to create a new, final image. Source_Used_Citation_Abbreviation: srtm30plus-na.pix Process_Date: 20050505 Source_Produced_Citation_Abbreviation: srtm30plus-na.pix Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Valerie Paskevich Contact_Organization: U.S. Geological Survey Contact_Position: Information Specialist, GIS Coordinator Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Road City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Country: USA Contact_Voice_Telephone: (508) 548-8700 x2281 Contact_Facsimile_Telephone: (508) 457-2310 Contact_Electronic_Mail_Address: vpaskevich@usgs.gov Process_Step: Process_Description: The final 8-bit grey-scale, shaded relief image was exported to a GeoTIFF image Source_Used_Citation_Abbreviation: srtm30plus-na.pix Process_Date: 20050505 Source_Produced_Citation_Abbreviation: srtm30plus-na.tif Source_Produced_Citation_Abbreviation: srtm30plus-na.tfw Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Valerie Paskevich Contact_Organization: U.S. Geological Survey Contact_Position: Information Specialist, GIS Coordinator Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Road City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Country: USA Contact_Voice_Telephone: (508) 548-8700 x2281 Contact_Facsimile_Telephone: (508) 457-2310 Contact_Electronic_Mail_Address: vpaskevich@usgs.gov Process_Step: Process_Description: The two source images were brought into Corel PhotoPaint. The color-encoded elevation image (strm30plus-na_color.tif) was overlaid ontop of the shaded relief image (srtm30plus-na_shade.tif_. The color image was made 60% transparent to allow shading to be seen through the image. The two images were combined to create a single 24-bit image showing elevation based on color. Source_Used_Citation_Abbreviation: srtm30plus-na_shade.tif Source_Used_Citation_Abbreviation: srtm30plus-na_color.tif Process_Date: 20050505 Source_Produced_Citation_Abbreviation: srtm30plus-world_pctshade.tif Source_Produced_Citation_Abbreviation: srtm30plus-world_pctshade.tfw Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Valerie Paskevich Contact_Organization: U.S. Geological Survey Contact_Position: Information Specialist, GIS Coordinator Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Road City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Country: USA Contact_Voice_Telephone: (508) 548-8700 x2281 Contact_Facsimile_Telephone: (508) 457-2310 Contact_Electronic_Mail_Address: vpaskevich@usgs.gov Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Raster Raster_Object_Information: Raster_Object_Type: Pixel Row_Count: 10804 Column_Count: 18001 Vertical_Count: 1 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Geographic: Latitude_Resolution: 0.008333 Longitude_Resolution: 0.008333 Geographic_Coordinate_Units: Decimal degrees Planar: Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: row and column Coordinate_Representation: Abscissa_Resolution: 0.008333 Ordinate_Resolution: 0.008333 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: U.S. Geological Survey Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Road City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Country: USA Contact_Voice_Telephone: (508) 548-8700 Contact_Facsimile_Telephone: (508) 457-2310 Resource_Description: Downloadable Data Distribution_Liability: Although this data set has been used by the U.S. Geological Survey (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. Trade, firm, or product names and other references to non-USGS products and services are provided for information only and do not constitute endorsement or warranty, express or implied, by the USGS, USDOI, or U.S. Government, as to their suitability, content, usefulness, functioning, completeness, or accuracy. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: TIFF Format_Specification: GeoTIFF image Format_Information_Content: Archive containing GeoTIFF image, world file and metadata. File_Decompression_Technique: zip Transfer_Size: 556.503 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://pubs.usgs.gov/of/2005/1001/data/basemaps/srtm30plus/srtm30plus-na_pctshade.zip Access_Instructions: Data are downloadable via the World Wide Web (WWW). Offline_Option: Offline_Media: DVD-ROM Recording_Capacity: Recording_Density: 4.75 Recording_Density_Units: Gbytes Recording_Format: UDF Fees: None Technical_Prerequisites: 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. Metadata_Reference_Information: Metadata_Date: 20050512 Metadata_Review_Date: 20050512 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: Valerie Paskevich Contact_Position: Information Specialist, GIS Coordinator Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Road City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Country: USA Contact_Voice_Telephone: (508) 548-8700 x2281 Contact_Facsimile_Telephone: (508) 457-2310 Contact_Electronic_Mail_Address: vpaskevich@usgs.gov Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Time_Convention: local time Metadata_Access_Constraints: None Metadata_Use_Constraints: None Metadata_Extensions: Online_Linkage: http://www.esri.com/metadata/esriprof80.html Profile_Name: ESRI Metadata Profile