NASA Landsat Data Collection (NLDC) Data Dictionary Active

 

Acquisition Date

• Field Definition:  Date scene was imaged.

               Format:
               YYYY/MM/DD
 

Browse Availability

• Field Definition:  This flag identifies whether or not the entity has a browse image available. A browse image provides the user with a visual overview of an inventory item. This is an on-line digital (raster format) image of an individual scene.

               Valid Codes:
               Y = Yes
               N = No
 

Cloud Cover

• Field Definition:  Cloud Cover is the percentage of the entire image obscured by clouds and their shadows. The percentage is displayed in increments of 10%.

               Valid Codes:
               0 = 0% but less than 10%
               1 = 10% but less than 20%
               2 = 20% but less than 30%
               3 = 30% but less than 40%
               4 = 40% but less than 50%
               5 = 50% but less than 60%
               6 = 60% but less than 70%
               7 = 70% but less than 80%
               8 = 80% but less than 90%
               9 = 90% up to 100%
 

Coordinates - Decimal Degrees

• Field Definition:  The coordinates of the scenes Center, NE Corner, NW Corner,SE Corner, SW Corner in decimal degrees.

                 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 coordinates of the scenes Center, NE Corner, NW Corner, SE Corner, SW Corner points in degrees, minutes, seconds.

                 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
 

Conditon

• Field Definition:  Space Imaging EOSAT supplied nominal center coordinate.
   

Data File Interleaving

• Field Definition:  Examples are Band sequential (BSQ) or Band Interleaving by line (BIL).
   

Data Format

• Field Definition:  See the following document for format descriptions landsat.usgs.gov/documents/NLAPS_II.pdf.
   

Ellipsoid Semi Major

• Field Definition:  Semi-major axis of earth ellipsoid in meters
   

Ellipsoid Semi Minor

• Field Definition:  Semi-minor axis of earth ellipsoid in meters
   

Entity ID

• Field Definition:  This field uniquely identifies the scene.

               Example:
               CE4033036009218810000000
               Valid Format: PRSPPPRRR00YYJUL10000000
               PR = Project Data set identifier
               S = Satellite
               P = WRS Path
               R = WRS Row
               00 = WRS Offset
               YY = Year of acquisition
               JUL = Julian day
               10 = TM or 90 = MSS
               000000 = Sequence number if required
 

Horizontal Datum

• Field Definition:  Horizontal datums are used for describing a point on the earth's surface.
   

Map Projection

• Field Definition:  Map Projection used on scenes.
   

Map Zone

• Field Definition:  In reference to UTM zones,the globe is divided into 60 zones, 6 degrees of longitude wide. Zones are numbered eastward, 1 to 60, beginning at 180 degrees (W long).
   

New Scene Id

• Field Definition:  New scene id in the format of satellite, path, row, date and sensor.
   

Old Scene ID

• Field Definition:  The scene id used by the originating source.
   

Orientation Angle

• Field Definition:  The orientation angle.
   

Original Source

• Field Definition:  The original source of the scene.
   

Pixel Height

• Field Definition:  Pixel height in meters.
   

Pixel Width

• Field Definition:  Pixel width in meters.
   

Processing Level

• Field Definition:  The processing level applied to the scene.
   

Product Size

• Field Definition:  This field identifies whether the scene is 'full scene, 'multi scene', or 'subscene'.
   

Project Source

• Field Definition:  The project associated with this scene.
   

Quality

• Field Definition:  The quality assigned to the original scene.
   

Radiometric_Calibration

• Field Definition:  The calibration method if applied.
   

Resampling Technique

• Field Definition:  The resampling applied to the scene.
   

Root Mean Square Error

• Field Definition:  The accuracy of the product compared to ground control point.
   

Satellite

• Field Definition:  The satellite number.
   

Sensor - Ascending or Descending

• Field Definition:  The sensor such as MSS or TM and ascending (night) , decending (day)
   

Spectral Bands Available

• Field Definition:  Spectral bands available.
   

State

• Field Definition:  Areas within the United States associated with NLCD.
   

Sun Azimuth

• Field Definition:  Sun Azimuth.
   

Sun Elevation

• Field Definition:  Sun Elevation.
   

User Orientation

• Field Definition:  User Orientation as requested. "Path" = the image is oriented to the path of the satellite, "map" = the image is oriented to map north on the selected projection. Not available for the SOM projection.
   

USGS Projection Parameters 1-5, 7, 9-10, 13

• Field Definition:  USGS map projection parameters. The map projection are floating point numbers that represent different parameters for different projections (not detailed here).
   

WRS First Row

• Field Definition:  Wrs first row if offset.
   

WRS Last Row

• Field Definition:  Wrs last row if offset.
   

WRS Path Number

• Field Definition:  The WRS Path Number is the longitudinal center line of a Landsat scene, corresponding to the center of an orbital track. Sequential numbers from east to west are assigned to 233 nominal satellite tracks for Landsat 4 and 5. Landsat 1-3 satellites have 251 tracks (paths). Path numbers can be used with Row numbers to designate a geographic search for a nominal scene center. The consistency and repeatability of the path for each satellite provides a common reference for all scenes acquired. The path is also a key indexing field for subsequent acquisition requests as well as data base inquiries.
   

WRS Offset

• Field Definition:  Set to "Y" if row offset.
   

WRS Row Number

• Field Definition:  The WRS Row Number is the latitudinal center line of a Landsat scene. This nominal configuration begins with row 1 at North 80 degrees 47 minutes and ends at row 122 at South 81 degrees 51 minutes for daylight acquisitions. Row 60 corresponds with the equator at 0 degrees latitude. A total of 248 rows are involved for all Landsat missions. Rows 123-248 are associated with night acquisitions.
   

WRS Type

• Field Definition:  Landsat MSS data from satellites 1-3 are referenced to the WRS 1 system, Landsat MSS from satellites 4-5 are referenced to the WRS 2 system.