IKONOS-2 USGS Purchased Imagery Data Dictionary

Acquisition Date

• Field Definition:  The year, month, and day the image was acquired.

              Format:

              YYYY/MM/DD

              YYYY = Year

              MM = Month

              DD = Day

 

Cloud Cover

• Field Definition:  Cloud Cover is the percentage of a scene that is obscured by clouds. Users are encouraged to preview browse images prior to downloading data products to confirm acceptable cloud cover impacts. Values may not be available for all scenes.

               Valid Codes:

               0 - 100

 

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

 

Date Entered

• Field Definition:  The Date Entered refers to the date the inventory record was added to the database.
  
   

Datum

• Field Definition:  The horizontal reference system associated with the image.

               Values:

               NAD83

               WGS84

 

Entity ID

• Field Definition:  The naming convention of each scene is based on acquisition parameters.

              Format:

              SSNYYYYMMDDHHMMZZIVV

              SS = Platform where IK = IKONOS

              N = Satellite Number

              YYYY = Year of Acquisition

              MM = Month of Acquisition

              DD = Day of Acquisition

              HH = Hour of Acquisition

              MM = Minutes of Acquisition

              ZZ = Seconds of Acquisition

              I = Sensor where M = Multispectral

              VV = Version Number

              Example:

              IK220040814215015M07

 

Event

• Field Definition:  The name of the event associated with the image.
  
   

File Format

• Field Definition:  The file format of the image.

              Values:

              GeoTIFF

 

Map Projection

• Field Definition:  The method used to represent the 3-dimensional surface of the earth.

              Values:

              Albers Equal Area

              Universal Transverse Mercator (UTM)

 

Number of Bands

• Field Definition:  The number of spectral bands contained in the image.
  
   

Pixel Size X

• Field Definition:  The image Pixel size width (X) measured in meters.
  
   

Pixel Size Y

• Field Definition:  The image Pixel size height (Y) measured in meters.
  
   

Processing Level

• Field Definition:  The level of correction applied to the image.

               Values:

               Orthorectified

               Geometrically Corrected

 

Satellite

• Field Definition:  The platform from which the data was acquired.

               Values:

               IKONOS-2

 

Sensor

• Field Definition:  The satellite instrument from which the data was acquired.

              Values:

              Multispectral

 

Sun Azimuth

• Field Definition:  Azimuth is the angle of horizontal deviation, measured clockwise, of a bearing from a standard direction. The Sun azimuth angle at the scene center.

               Values:

               -180.0000 through +180.00000

 

Sun Elevation

• Field Definition:  Elevation is the angle of vertical deviation, measured clockwise, of a bearing from a standard direction. The Sun elevation angle at the scene center.

              Values:

              -90.00000 through +90.000000 degrees

 

UTM Zone

• Field Definition:  The UTM Zone number associated with the scene.
  
   

Vendor ID

• Field Definition:  The file name provided by the original vendor.

              Example:

              2004081421501540000011625363

 

Vendor

• Field Definition:  The name of the company that provided the data.