ASTER Data Dictionary

 

 

Acquisition Date

• Field Definition:  The starting acquisition date the image was acquired.

          Format:

               YYYY/MM/DD

 

Coordinates - Decimal Degrees

• Field Definition:  The latitude and longitude are provided in decimal degrees for the following fields:

          Values:

          Scene Center Latitude and Longitude

          Northeast (NE) Corner Latitude and Longitude

          Northwest (NW) Corner Latitude and Longitude

          Southeast (SE) Corner Latitude and Longitude

          Southwest (SW) Corner Latitude and Longitude

 

          Latitude Format Decimal Degrees: -90.000 through 90.000

          Longitude Format Decimal Degrees: -180.000 through 180.000

 

          Number of decimal places will vary by dataset – check collection in EE.

 

Coordinates - Degrees, Minutes, Seconds

• Field Definition:  The latitude and longitude are provided in degrees, minutes, and seconds for the following fields:

          Values:

          Scene Center Latitude and Longitude

          Northeast (NE) Corner Latitude and Longitude

          Northwest (NW) Corner Latitude and Longitude

          Southeast (SE) Corner Latitude and Longitude

          Southwest (SW) Corner Latitude and Longitude

 

          Longitude Format:

          DDDMMSS.SSH

          DDD = Degree(s) with a range of 0 through 180

          MM = Minute(s) with a range of 0 through 59

          SS.SS = Second(s) with a range of 0 through 59.99

          H = Hemisphere with E for east and W for west

 

          Latitude Format:

          DDMMSS.SSH

          DD = Degree(s) with a range of 0 through 90

         MM = Minutes(s) with a range of 0 through 59

         SS.SS = Second(s) with a range of 0 through 59.99

         H = Hemisphere with N for north and S for south

 

Entity ID

• Field Definition:  This field uniquely identifies individual ASTER images.

 

License ID

• Field Definition:  License ID which identifies which agency has access to the data.

 

Processing Level

• Field Definition:  These are the product descriptions for the various formats of ASTER Level 1B data. They are also referred to as the "short name".

         Values:

         Processing Levels:

•  AST L1B = Registered Radiance at the Sensor: The ASTER Level-1B Registered Radiance at the Sensor product contains     radiometrically calibrated and geometrically co-registered data for the acquired channels of the three different telescopes of Level-1A data.
• AST L1BE = Routine Registered Radiance at the Sensor - Expedited: The ASTER Expedited L1B Registered Radiance at the Sensor data set is produced with the express purpose of providing the ASTER Science Team members data of their particular interest in quick turn-around time from the moment the data are acquired.

 

SWIR Mode

• Field Definition:  The Short Wave Infrared Radiometer (SWIR) is an advanced high resolution multispectral radiometer which detects reflected solar radiation from the earth surface in the wavelength region of 1.6 - 2.43 um. SWIR also has the capability to change the boresight in the cross-track direction by +/-8.55 degrees from nadir, by using a pointing mechanism.

 

TIR Mode

• Field Definition:  The Thermal Infrared Radiometer (TIR) s an advanced spaceborne radiometer with five spectral bands in the thermal infrared (8-12 um). Its ability to measure thermal emission properties is useful for locating mineral resources, characterizing the land and sea surface and observing the atmosphere.

 

Version Number

• Field Definition:  The Version number of data.

           Values:

           1.1

           2.0

 

VNIR1 Mode

• Field Definition:  This VNIR subsystem backward looking telescope is of the same design as the nadir telescope and contains only a single silicon charge coupled detector line array and no calibration lamps as it is only used to acquire a stereo pair image.

 

VNIR2 Mode

• Field Definition:  This VNIR subsystem nadir looking telescope is a reflecting-refracting improved Schmidt design. The focal plane of this telescope contains three 5000 silicon charge coupled detector line arrays.

 

WRS Path

• Field Definition:  WRS-defined nominal Landsat satellite track (path).

          Values:

          001 - 251

 

WRS Row

• Field Definition:  WRS latitudinal center line of a Landsat image.

           Values:

           001-059 = Northern Hemisphere (Descending)

           060 = Equator (Descending)

           061-119 = Southern Hemisphere (Descending)

           120-122 = Southern Polar Zone (Descending)

           123-183 = Southern Hemisphere (Ascending)

           184 = Equator (Ascending)

           185-246 = Northern Hemisphere (Ascending)

           247-248 = Northern Polar Zone (Descending)