RADARSAT ScanSAR Wide Beam Image Mosaic (100 m cell size) covering the coastal regions of the Chukchi and Beaufort Seas, Northern Alaska, USA and Northwest Canada.

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Spatial_Reference_Information
• Entity_and_Attribute_Information
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: Canadian Space Agency

Originator: Alaska Satellite Facility

Publication_Date: 20051231

Title:

RADARSAT ScanSAR Wide Beam Image Mosaic (100 m cell size) covering the coastal regions of the Chukchi and Beaufort Seas, Northern Alaska, USA and Northwest Canada.

Geospatial_Data_Presentation_Form: remote-sensing image

Online_Linkage: <http://mms.gina.alaska.edu>

Description:

Abstract:

Full resolution (100 meter) geocoded SAR images have been processed from the Alaska Satellite Facility's (ASF) archive of raw RADARSAT-1 ScanSAR Wide Beam signal data. This data set is an image mosaic comprised of several frames covering the Chukchi Sea from Wainwright, Alaska across the Beaufort Sea to Mackenzie Bay, Canada.

Purpose:

These satellite data were acquired and processed to meet contract requirements for the US Mineral Management Service: Mapping and Characterization of Recurring Spring Leads and Landfast ice in the Beaufort and Chukchi Seas (AK-03-06)

Supplemental_Information:

For the purposes of the MMS study, the file names associated with the Radarsat mosaics are prefixed with an "r". The year and range of days composing each mosaic are incorporated in the file names. For descriptive purposes, the following abbreviations are used as placeholders for real values to illustrate the naming convention: "d" = day of year and "Y" = Year. This naming convention is noted as rYY_ddd_ddd.tif. An example of this convention for a 2001 mosaic composed of imagery from days 288-290 would be "r01_288_290.tif".

The Alaska Satellite Facility's archive of RADARSAT-1 ScanSAR data runs from late October 1996 to the present. The Wide ScanSAR mode has two distinct settings. The first Wide ScanSAR mode obtains the largest swath width, 526 km, by combining Wide Swath Beams 1, 2, and 3 as well as Standard Beam 7. The second Wide ScanSAR mode uses Wide Swath Beams 1 and 2 with Standard Beams 5 and 6 for a swath width of nearly 460 km.

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 199610

Ending_Date: unknown

Currentness_Reference: ground condition

Status:

Progress: Complete

Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -160.813048

East_Bounding_Coordinate: -133.824195

North_Bounding_Coordinate: 72.620297

South_Bounding_Coordinate: 68.714097

Keywords:

Theme:

Theme_Keyword_Thesaurus: Aquatic Sciences and Fisheries Thesaurus

Theme_Keyword: satellite image

Theme_Keyword: remote sensing

Theme_Keyword: sea ice

Theme_Keyword: SAR

Place:

Place_Keyword_Thesaurus: Dictionary of Alaska Place Names

Place_Keyword: Arctic Ocean

Place_Keyword: Chukchi Sea

Place_Keyword: Beaufort Sea

Place_Keyword: North Slope

Place_Keyword: Alaska

Place_Keyword: Canada

Access_Constraints:

In order to obtain SAR data from the Alaska Satellite Facility, prospective users must submit a proposal to NASA for approval. If NASA approves the proposal, the user is required to sign a research agreement with NASA Headquarters.

Use_Constraints:

The data are for the researcher's use for bona fide research purposes only. The data will not be reproduced or distributed to any other parties, as consistent with the relevant MOU. Users will publish in the open literature results of research accomplished with the requested data, including derived data sets, and the algorithms and models used. The users will provide, if requested, a copy of such results including derived data sets, algorithms, models, and documentation to ASF for archival and distribution. Sanctions will be placed on those users who receive data from ASF under the above conditions and who subsequently violate the research agreement.

Failure by research users to abide by the terms of the research agreement will result in the actions outlined below:

Termination of the research agreement and potential loss of funding support by NASA. Termination of the research agreement and notification by NASA to the investigator's sponsoring agency and to the relevant space agency of the violation. Further access to data must fall into the category of commercial use.

Point_of_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Hajo Eicken

Contact_Organization: Geophysical Institute

Contact_Position: Principal Investigator

Contact_Address:

Address_Type: mailing and physical address

Address: 903 Koyukuk Drive

City: Fairbanks

State_or_Province: Alaska

Postal_Code: 99775

Country: USA

Contact_Voice_Telephone: 907.474.7280

Contact_Facsimile_Telephone: 907-474-7290

Contact_Electronic_Mail_Address: hajo.eicken@gi.alaska.edu

Browse_Graphic:

Browse_Graphic_File_Name: *.jpg

Browse_Graphic_File_Description: Thumbnail image

Browse_Graphic_File_Type: JPEG

Data_Set_Credit:

This data set was collected by the Canadian Space Agency's RADARSAT-1 sensor. The signal data was downlinked and archived at the Alaska Satellite Facility (ASF). The funding for processing these data into geocoded image mosaics was provided by the US Mineral Management Service for Mapping and Characterization of Recurring Spring Leads and Landfast ice in the Beaufort and Chukchi Seas (AK-03-06, MMS-71707)

Native_Data_Set_Environment:

Microsoft Windows 2000 Version 5.0 (Build 2195) Service Pack 4; ESRI ArcCatalog 8.3.0.800

Data_Quality_Information:

Logical_Consistency_Report:

Geocoded imagery was quality checked against the 1:250000 NOAA coastline and bathymetry data set to confirm that the imagery was correctly georeferenced. Each file was visually checked in ArcMap to confirm placement and projection definition.

Completeness_Report: Complete.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

Auto correlation techniques noted a shift of 8 pixels between pairs of ascending and descending geocoded data derived from ASF's automated geocoding routine. The offset was associated with the look direction of the sensor. This error was reduced by choosing primarily descending data frames and applying a 4 pixel shift to the imagery.

Quantitative_Horizontal_Positional_Accuracy_Assessment:

Horizontal_Positional_Accuracy_Value: 200 meters

Horizontal_Positional_Accuracy_Explanation: Auto correlation of image pairs in ENVI.

Lineage:

Process_Step:

Process_Description:

Full resolution (100 meter) RADARSAT data were acquired from the Alaska Satellite Facility via the Electronic Data Gateway. Binary data were processed to a GeoTiff format in the Alaska Statewide Albers equal-area conical map projection using ASF's Advanced Product Development SAR tools. A script was used to rename each file to include the year, day of year, hours and minutes in the file name. 100 meter pixel size image mosaics were generated using ENVI's IDL scripting environment melding data granules from a three day orbit repeat. Most of the mosaics include imagery that were captured over a three day period. In some cases, it was necessary to extend the period by 1-2 days in order to fill in data gaps between swaths. For specific SAR granule ids used (frames) see SAR_catalog.xls on the project web site at: <http://mms.gina.alaska.edu/supp/SAR_catalog.xls>. The projection properties were defined with ESRI's ArcCatalog software using a Visual Basic Script, "BatchRasterSpatialRef.bas" to ensure compatibility with ArcGIS. Each mosaic includes indexing information (*.rdd files) to expedite drawing time.

Process_Date: 20050401

Process_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Allison Graves Gaylord

Contact_Organization: Nuna Technologies

Contact_Position: Owner / GIS Specialist

Contact_Address:

Address_Type: mailing address

Address: P.O. Box 1483

City: Homer

State_or_Province: AK

Postal_Code: 99603-1483

Country: USA

Contact_Voice_Telephone: 907.399.1120

Contact_Facsimile_Telephone: 907.235.3476

Contact_Electronic_Mail_Address: nunatech@usa.net

Hours_of_Service: business hours

Contact_Instructions: Email preferred.

Process_Step:

Process_Description:

The IDL image mosaic script was developed at the University of Alaska Fairbanks.

Process_Date: 20041101

Process_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Andy Mahoney

Contact_Organization: University of Alaska Fairbanks, Geophysical Institute

Contact_Position: PhD Candidate

Contact_Address:

Address_Type: mailing and physical address

Address: 903 Koyukuk Dr., P.O. Box 757320

City: Fairbanks

State_or_Province: AK

Postal_Code: 99775-7320

Country: USA

Contact_Voice_Telephone: 907-474-5648

Contact_Facsimile_Telephone: 907-474-7290

Contact_Electronic_Mail_Address: Mahoney@gi.alaska.edu

Hours_of_Service: business hours

Contact_Instructions: Email preferred.

Process_Step:

Process_Description:

ASF's Advanced Product Development SAR Tools were adapted to calibrate and geocode ScanSAR imagery to the Alaska Statewide Albers equal-area conical map projection.

Process_Date: 20040601

Process_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Rudi Gens

Contact_Organization: Alaska Satellite Facility

Contact_Position: Remote Sensing Scientist

Contact_Address:

Address_Type: mailing and physical address

Address: 903 Koyukuk Dr

City: Fairbanks

State_or_Province: AK

Postal_Code: 99775-7320

Country: USA

Contact_Voice_Telephone: 907-474-7621

Contact_Facsimile_Telephone: 907-474-6441

Contact_Electronic_Mail_Address: rgens@asf.alaska.edu

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Raster

Raster_Object_Information:

Raster_Object_Type: Pixel

Row_Count: 12709

Column_Count: 13637

Vertical_Count: 1

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Map_Projection:

Map_Projection_Name: Albers Conical Equal Area

Albers_Conical_Equal_Area:

Standard_Parallel: 55.000000

Standard_Parallel: 65.000000

Longitude_of_Central_Meridian: -154.000000

Latitude_of_Projection_Origin: 50.000000

False_Easting: 0.000000

False_Northing: 0.000000

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: row and column

Coordinate_Representation:

Abscissa_Resolution: 50.000000

Ordinate_Resolution: 50.000000

Planar_Distance_Units: meters

Geodetic_Model:

Horizontal_Datum_Name: North American Datum of 1983

Ellipsoid_Name: Geodetic Reference System 80

Semi-major_Axis: 6378137.000000

Denominator_of_Flattening_Ratio: 298.257222

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: Band_1

Entity_Type_Definition: Band 1

Entity_Type_Definition_Source: ASF

Attribute:

Attribute_Label: ObjectID

Attribute_Definition: Internal feature number.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Object Identifier

Enumerated_Domain_Value_Definition: Internal Feature Number

Enumerated_Domain_Value_Definition_Source: Computed

Attribute:

Attribute_Label: Value

Attribute_Definition: Cell Value

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Value

Enumerated_Domain_Value_Definition: Internal Feature Number for Raster based Data

Enumerated_Domain_Value_Definition_Source: Computed

Attribute:

Attribute_Label: Count

Attribute_Definition: Cell Count

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Count

Enumerated_Domain_Value_Definition: Number of Grid cells of a Count

Enumerated_Domain_Value_Definition_Source: Computed

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Alaska SAR Facility User Services

Contact_Address:

Address_Type: mailing and physical address

Address: Geophysical Institute, University of Alaska Fairbanks

City: Fairbanks

State_or_Province: Alaska

Postal_Code: 99775-7320

Country: USA

Contact_Voice_Telephone: (907) 474-6166

Contact_Facsimile_Telephone: (907) 474-2665

Contact_Electronic_Mail_Address: uso@asf.alaska.edu

Resource_Description: Downloadable Data

Distribution_Liability:

The University of Alaska makes no express or implied warranties (including warranties of merchantability and fitness) with respect to the character, function, or capabilities of the electronic services or products or their appropriateness for any users purposes. In no event will the University of Alaska be liable for any incidental, indirect, special, consequential or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products, any failure thereof or otherwise, and in no event will the State of Alaska's liability to the requestor or anyone else exceed the fee paid for the electronic service or product.

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Format_Name: CEOS

Format_Version_Date: 200301101

Format_Specification: RADARSAT-1 SCANSAR GEOCODED IMAGES - FULL RES

Transfer_Size: 128 MB

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name: ftp.asf.alaska.edu

Access_Instructions:

Preferred access method is electronic File Transfer Protocol (FTP)

Digital_Form:

Digital_Transfer_Information:

Format_Name: GeoTiff

Format_Version_Date: 20050401

Format_Specification: Georeferenced Tagged Image File Format

Format_Information_Content:

GeoTIFF is a public domain metadata standard which allows geographic information to be embedded within a TIFF file. This metadata can be used by software to position the geographic data.

File_Decompression_Technique: Winzip

Transfer_Size: 30 MB

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name: <http://mms.gina.alaska.edu>

Access_Instructions: password required for internal web site

Fees: none

Ordering_Instructions:

To obtain SAR source data from the Alaska Satellite Facility (ASF), users must submit a proposal to NASA for approval. Once a user has been approved to access the data and has required login information, they must use the online search tools for ASF's Data Active Archive Center (DAAC) to locate relevant scenes and place orders.

The MMS project team performed value added processing to create mosaics in GeoTIFF format to meet the requirements of the MMS contract. These GeoTiffs are available on a password protected web site maintained by UAF's Geographic Information Network of Alaska.

Available_Time_Period:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 19961015

Ending_Date: 20040715

Metadata_Reference_Information:

Metadata_Date: 20040915

Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Nuna Technologies

Contact_Person: Allison Graves Gaylord

Contact_Position: Owner / GIS Specialist

Contact_Address:

Address_Type: mailing address

Address: PO Box 1483

City: Homer

State_or_Province: AK

Postal_Code: 99603-1483

Country: USA

Contact_Voice_Telephone: 907.399.1120

Contact_Facsimile_Telephone: 907.235.3476

Contact_Electronic_Mail_Address: nunatech@usa.net

Hours_of_Service: Business Hours

Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998

Metadata_Time_Convention: local time

Metadata_Extensions:

Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>

Profile_Name: ESRI Metadata Profile