Global Land Survey 2005 Islands; Earth Observing 1 (EO-1) Advanced Land Imager (ALI) - (2004-2008) Data Dictionary

 

Acquisition Date

• Field Definition:  The date the image was acquired.

          Format:

          YYYY/MONTH/DD

 

Browse Availability

• Field Definition:  This flag identifies whether or not the entity has a browse image available with it. A browse image provides the user with a visual overview of an inventory item. The browse image is an online digitally subsampled raster image.

          Valid Codes:

          Y = Yes

          N = No

 

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

 

Datum

• Field Definition:  The datum associated with the image.

          Valid Code:

          WGS 84 = Worldgeodetic System 1984

 

Entity ID

• Field Definition:  This field uniquely identifies the individual landsat scene.

          Example:

               EO1A2060982006179110PX_SGS_01

 

         Valid Format:

         EO1SPPPRRRYYYYDDDXXXML_GGG_VV

         EO1 = Satellite

         S = Sensor (H=Hyperion A=ALI)

         PPP = Target WRS path

         RRR = Target WRS row

         YYYY = Year of acquisition

         DDD = Julian day of acquisition

         X (0=off; 1=on) Hyperion

         X (0=off; 1=on) ALI

         X (0=off; 1=on) AC

         M = Pointing mode*

         L = Scene length**

         GGG = Ground/Receiving Station

         VV = Version Number

 

         *Pointing mode

         N = Nadir

         P = Pointed within path/row

         K = Pointed outside path/row

 

        **Scene length

        F = Full scene

        P = Partial scene

        Q = Second partial scene

        S = Swath

        0 - 9 = Special modes 0 - 9

        Remainder of alphabet are EDC collects

 

Orientation

• Field Definition:  The orientation of the image.

          Values:

          Valid code = NUP (North Up)

 

Product Type

• Field Definition:  The product type, processing level, of the image.

 

QA Percent Missing Data

• Field Definition:  Estimated percentage of scene missing or unusable

          Values:

          Valid Values = 0 - 100

 

Resampling Technique

• Field Definition:  The resampling applied to the scene.

          Valid Codes:

          CC = Cubic Convolution

          NN = Nearest Neighbor

 

Satellite

• Field Definition:  The satellite which acquired the data.

          Values:

          Valid Codes = EO1

 

Scene Size

• Field Definition:  The size of all files associated with the scene.

 

Sensor

• Field Definition:  The sensor which acquired the data.

           Values:

           Valid Codes = ALI

 

Sun Azimuth

• Field Definition:  The Sun azimuth angle at the "true" WRS scene center. Azimuth is the angle of horizonal deviation, measured clockwise from the north.

           Values:

           -180.0000000 through +180.0000000 degrees (with 7-digit precision)

          NOTE: A positive value

 

Sun Elevation

• Field Definition:  The Sun elevation angle at the "true" WRS scene center. Elevation is the angle of vertical deviation from the tangent to the earth's surface (at scene center point) to the line between the sun's center and the scene center point. NOTE: The solar zenith angle will be 90 degrees minus the solar elevation angle.

          Values:

          0 through +90.0000000 (with a 7-digit precision)

 

WRS Path

• Field Definition:  The WRS-2 Path number associated with the scene.

          Values:

          001 through 233

 

WRS Row

• Field Definition:  The WRS-2 Row number associated with the scene.

          Values:

          001 through 244

 

Zone Number

• Field Definition:  The UTM zone number associated with the image.