USGS: Landsat Data Dictionary

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Acquisition Quality

Field Definition: Acquisition Quality is a value, expressed as a single digit number, based on: (1) errors encountered during archive processing; and/or (2) visible artifacts in the data when manually inspected.

Values:

9 = Excellent (no quality issues or errors detected)

7-8 = Good (minor quality issues and/or errors detected)

5-6 = Fair (moderate quality issues and/or errors detected)

1-2 = Extremely Poor (severe quality issues and/or errors detected)

0 = Missing Value

Browse Available at Station (ETM+ International Ground Station Collection only)

Field Definition: Indicates whether a browse image is available for viewing at or distribution from the IGS.

Values:

Y = Yes

N = No

Browse Exists

Field Definition: Indicates whether a browse exists for this scene at EROS.

Values:

Y = Yes, a browse does exist for this scene

N = No, a browse does not exist for this scene

CCT Source Available

Field Definition: CCT source(s) (comma separated list) available in the archive for this scene.

Values:

CORRECTED = One or more corrected TM CCT quad tapes available

UNCORRECTED = One or more uncorrected TM CCT quad tapes available

N = No CCT tape exist

Cloud Cover

Field Definition: Cloud coverage (percent) of a WRS scene.

Values:

0.00 - 100.00

-1 = Cloud cover not calculated or assessed

Cloud Cover Quadrant Lower Left

Field Definition: Cloud coverage (percent) of the lower left quadrant of the WRS scene.

Values:

0.00 - 100.00

-1 = Cloud cover not calculated or assessed

Cloud Cover Quadrant Lower Right

Field Definition: Cloud coverage (percent) of the lower right quadrant of the WRS scene.

Values:

0.00 - 100.00

-1 = Cloud cover not calculated or assessed

Cloud Cover Quadrant Upper Left

Field Definition: Cloud coverage (percent) of the upper left quadrant of the WRS scene.

Values:

0.00 - 100.00

-1 = Cloud cover not calculated or assessed

Cloud Cover Quadrant Upper Right

Field Definition: Cloud coverage (percent) of the upper right quadrant of the WRS scene.

Values:

0.00 - 100.00

-1 = Cloud cover not calculated or assessed

Corner Lower Left Latitude

Field Definition: Calculated latitude value (degrees) for the lower left corner. A positive (+) value indicates North latitude. A negative (-) value indicates South latitude.

Values:

-90.00000 through +90.00000

Corner Lower Left Longitude

Field Definition: Calculated longitude value (degrees) for the lower left corner. A positive value (+) indicates East longitude. A negative (-) value indicates West longitude.

Values:

-180.00000 through +180.00000

Corner Lower Right Latitude

Field Definition: Calculated latitude value (degrees) for the lower right corner. A positive (+) value indicates North latitude. A negative (-) value indicates South latitude.

Values:

-90.00000 through +90.00000

Corner Lower Right Longitude

Field Definition: Calculated longitude value (degrees) for the lower right corner. A positive value (+) indicates East longitude. A negative (-) value indicates West longitude.

Values:; -180.00000 through +180.00000
Corner Upper Left Latitude

Field Definition: Calculated latitude value (degrees) for the upper left corner. A positive(+) value indicates North latitude. A negative (-) value indicates South latitude.

Values:

-90.00000 through +90.00000

Corner Upper Left Longitude

Field Definition: Calculated longitude value (degrees) for the upper left corner. A positive (+) value indicates East longitude. A negative (-) value indicates West longitude.

Values:

-180.00000 through +180.00000

Corner Upper Right Latitude

Field Definition: Calculated latitude value (degrees) for the upper right corner. A positive (+) value indicates North latitude. A negative (-) value indicates South latitude.

Values:

-90.00000 through +90.00000

Corner Upper Right Longitude

Field Definition: Calculated longitude value (degrees) for the upper right corner. A positive value (+) indicates East longitude. A negative (-) value indicates West longitude.

Values:

-180.00000 through +180.00000

Data Category

Field Definition: Current data category where the data has been placed.

Values:

NOMINAL = Nominal Data

Data Type Level 1

Field Definition: Data type identifier string for Level 1 products.

Values:

ETM L1T

ETM L1G

ETM L1Gt

MSS LIT

MSS L1G

MSS L1Gt

PR = Processing Required

TM L1T

TM L1G

TM L1Gt

Date Acquired

Field Definition: Year, month and day that this scene was imaged.

Format:

YYYY/MM/DD

Day Night

Field Definition: Day or night condition of the scene.

Values:

DAY = Day scene

NIGHT = Night scene

DCT Source Available

Field Definition: Digital archive source(s) (comma separated list) available for this scene id.

Values:

TMA = One or more radiometrically corrected/geometrically uncorrected TMA DCTs exist

TMR = One or more TMR DCTs exist

N = No DCT exists

Digital Source Available

Field Definition: Indicates whether a digital source exists.

Values:

Y = Yes, a digital source does exist for this scene

N = No, a digital source does not exist for this scene

DLT Source Available

Field Definition: DLT source available for this scene.

Values:

Y = Yes, a DLT exists

N = No, DLT does not exist

Film Source Available

Field Definition: Indicates whether a black-and-white film source exists.

Values:

Y = Yes, a black-and-white film source does exist for this scene

N = No, a black-and-white film source does not exist for this scene

Full Aperture Calibration

Field Definition: Indicates whether the aperture flag is on.

Values:

Y = Yes, a full aperture calibration activity exists

N = No full aperture calibration activity

Gain Band (1 - 5, 6 VCID* 1, 6 VCID* 2, 7 - 8)

Field Definition: Band gain state of band detected at the start of a WRS scene.

Values:

H = Band was acquired in high gain mode

L = Band was acquired in low gain mode

U = Unknown

* (Virtual Channel Identifier)

Gain Change - Band (1 - 5, 6 VCID* 1, 6 VCID* 2, 7 - 8)

Field Definition: The presence and direction of change in detector gain state within the WRS scene.

Values:

0 = Indicates no gain change

+ = Indicates change from low to high gain

- = Indicates change from high to low gain

HH = No band gain change within the scene whose

gain band state was acquired in high gain mode

LL = No band gain change within the scene whose gain band state was acquired in low gain mode

LH = A low to high band gain change within the scene

HL = A high to low band gain change within the scene

U = Unknown

* (Virtual Channel Identifier)

Gap Phase Source

Field Definition: Source of ephemeris data from which the gap phase statistic was generated. Used for ETM+ SLC-off data only.

Values:

DE = Definitive Ephemeris

PCD = Payload Correction Data

NA = Not Applicable (Scan Line Corrector (SLC)-on data.

Gap Phase Statistic

Field Definition: The along-track distance from the center of the closest forward-to-reverse scan gap to the nominal WRS scene center. (NULL only for scan line corrector (SLC)-on data)

Values:

-17.000000 through +17.0000000

Null

Image Quality VCID* 1 - 2

Field Definition: A single digit number that represents an image quality value used by the Landsat 7 Processing System (LPS). Image Quality 1 represents quality for format 1 (bands 1, 2, 3, 4, 5, 6h) and Image Quality 2 represents quality for format 2 (bands 6l, 7 and 8). Values for each format can range from 0 - 9.

The image quality is based on the number and distribution of bad scans or equivalent bad scans in a scene. It is computed by dividing the total number of filled minor frames for a scene by 6313 (the nominal number of image data minor frames in a major frame for 30 meter bands). This will give a number of equivalent bad scans. The distribution of filled minor frames is characterized as being either clustered or scattered. A cluster of 128 bad scans will still yield a scene with a cluster of 246 good scans which is two-thirds of a scene. A scattering of 128 bad scans may make the entire image worthless.

Values for Image Quality:

Value	Quality
9	No errors detected, a perfect scene
8	Less than or equal to 4 equivalent bad scans, clustered
7	Less than or equal to 4 equivalent bad scans, scattered
6	Less than or equal to 16 equivalent bad scans, clustered
5	Less than or equal to 16 equivalent bad scans, scattered
4	Less than or equal to 64 equivalent bad scans, clustered
3	Less than or equal to 64 equivalent bad scans, scattered
2	Less than or equal to 128 equivalent bad scans, clustered
1	Less than or equal to 128 equivalent bad scans, scattered
0	Greater than 128 equivalent bad scans, scattered (more than 33% of scene is bad)
-1	Image quality not calculated or assessed
*	(Virtual Channel Identifier)

Landsat Scene Identifier

Field Definition: Unique Landsat scene identifier.

Format:

Landsat Scene Identifier: LXSPPPRRRYYYYDDDGSIVV

Where:

L = Landsat

X = Sensor (M = MSS, T = TM, E = ETM)

S = Satellite

PPP = WRS Path

RRR = WRS Row

YYYY = Year of Acquisition

DDD = Day of Acquisition Year

GSI = Ground Station Identifier

VV = Version

Quality Band (1 - 8)

Field Definition: Quality band is a value, expressed as a single digit number, based on: (1) errors encountered during archive processing; and/or (2) visible artifacts in the data when manually inspected.

Values:

9 = Excellent (no quality issues or errors detected)

7-8 = Good (minor quality issues and/or errors detected)

5-6 = Fair (moderate quality issues and/or errors detected)

3-4 = Poor (significant quality issues and/or errors detected)

1-2 = Extremely Poor (severe quality issues and/or errors detected)

0 = Worst

M = Band is missing

U = Band has an unknown quality score (expected but insufficient information)

Scene Center Latitude

Field Definition: WRS scene center latitude (degrees). A positive (+) value indicates North latitude. A negative (-) value indicates South latitude.

Values:

-90.0000 through +90.00000

Scene Center Longitude

Field Definition: WRS scene center longitude (degrees). A positive (+) value indicates East longitude. A negative (-) value indicates West longitude.

Values:

-180.00000 through +180.00000

Scene Center Scan Time

Field Definition: Spacecraft time associated with the center of a WRS scene center scan.

Scene Center Time Number

Field Definition: Number of seconds from epoch time of 1995 at midnight.

Values:

1 - 999999999999

Scene Mode

Field Definition: Signal processing prior to transmission from satellite to ground station.

Values:

COMPRESSED = Compressed mode used to acquire the first 3 bands; the remaining bands are acquired in a linear mode

LINEAR = Linear mode used to acquire all bands

U = Unknown

Scene Source

Field Definition: Source that this version of the scene is stored.

Values:

LAM = Landsat Archive Manager

DLT = Digital Linear Tape

HDT = High Density Tape

FILM = Film

DCT = Digital Cassette Tape

Sensor Anomalies

Field Definition Special sensor condition (comma separated list)that pertains to this acquisition.

Values:

ASCENDING_DESCENDING = Ascending/Descending problem Landsat 4/5 coordinates recalculated for descending.

BAND_4_NOT_DECOMPRESSED = Band 4 is not decompressed = dynamic range of 0 - 64.

Affects only the first few months of Landsat 4, band 4 acquisitions.

BUMPER_MODE = Landsat 5 or Landsat 7 scene acquired while the satellite was in bumper mode.

Landsat 5 was permanently placed into bumper mode May 1, 2002.

Landsat 7 was permanently placed into bumper mode April 1, 2007.

FRAMING = Poor framing problem.

LINE_START_ANOMALY = Line Start Anomaly (Landsat 3 only); up to one third of the

image data is missing; quality ratings based on image data present.

N = No sensor anomaly exists.

POST_LAUNCH = Post launch problems from TMACS.

PRE_WRS = Pre WRS experimental data, scene center may be geographically off the

WRS orbital track.

RADIOMETRIC_CALIBRATION_DATA = Engineering radiometric calibration data.

SENSOR_WARM_UP = Sensor warm-up problem; roller coaster defect.

SLC_OFF = Scan Line Corrector off.

STRIPING = Striping problem.

Sensor Mode

Field Definition: Mode that the sensor was in during capture of this interval.

Values:

BUMPER = Bumper mode

SAM = SAM (Scan Angle Monitor) mode

Spacecraft Identifier

Field Definition: Spacecraft from which the data was captured.

Values:

Landsat 1

Landsat 2

Landsat 3

Landsat 4

Landsat 5

Landsat 7

Start Time

Field Definition: Year, Day of year and GMT spacecraft start time of either the first major frame of the interval or the start of a WRS scene.

Format:

YYYY:DDD:HH:MI:SS.SSSSSSS

YYYY = Four digit year

DDD = Day of year

HH = Hour (00-23)

MI = Minute

SS.SSSSSSS = Fractional seconds

Station Identifier

Field Definition: Original ground receiving station to which this data was downlinked.

Values:

AAA = Data held by EROS, North American receiving site unknown

AAO = Data held by EROS, North American receiving site unknown

AGS = Data held by EROS, Receiving station, Poker Flat, Alaska

ASA = Data held by EROS, Receiving station, Alice Springs, Australia

ASN = Data held by EROS, Receiving station, Alice Springs, Australia

BIK = Data held by EROS, Receiving station, Bishkek, Kyrgyzstan

BJC = Data held by EROS, Receiving station, Beijing, China

BKT = Data held by EROS, Receiving station, Bangkok, Thailand

CHM = Data held by EROS, Receiving station, Chetumal, Mexico

COA = Data held by EROS, Receiving station, Cordoba, Argentina

CUB = Data held by EROS, Receiving station, Cuiaba, Brazil

DKI = Data held by EROS, Receiving station, Parepare, Indonesia

EDC = Data held by EROS, Receiving station unknown

FUI = Data held by EROS, Receiving station, Fucino, Italy (Historical)

GLC = Data held by EROS, Receiving station, Gilmore Creek, AK, US

GNC = Data held by EROS, Receiving station, Gatineau, Canada

HAJ = Data held by EROS, Receiving station, Hatoyama, Japan

HIJ = Data held by EROS, Receiving station, Hiroshima, Japan

HOA = Data held by EROS, Receiving station, Hobart, Australia

IKR = Data held by EROS, Receiving station, Irkutsk, Russia

JSA = Data held by EROS, Receiving station, Hartebeesthoek, South Africa

KIS = Data held by EROS, Receiving station, Kiruna, Sweden

KHC = Data held by EROS, Receiving station, KaShi, China

LGS = Data held by EROS, Landsat 5 data acquired by EROS beginning July 1, 2001

MGR = Data held by EROS, Receiving station, Magadan, Russia

MLK = Data held by EROS, Receiving station, Malinda, Kenya

MOR = Data held by EROS, Receiving station, Moscow, Russia

MPS = Data held by EROS, Receiving station, Maspalomas, Spain

MTI = Data held by EROS, Receiving station, Matera, Italy

PAC = Data held by EROS, Receiving station, Prince Albert, Canada

PFS = Data held by EROS, Receiving station, Poker Flat, Alaska

SGS = Data held by EROS, Receiving station, Svalbard, Norway

ULM = Data held by EROS, Receiving station, Ulan Bator, Mongolia

UPR = Data held by EROS, Receiving station, University of Puerto Rico, Mayaguez, US

XXO = Data held by EROS, Receiving station unknown

XXX = Data held by EROS, Receiving station unknown

Stop Time

Field Definition: Year, Day of year and GMT spacecraft stop time of either the last major frame of the interval or the stop of a WRS scene.

Format:

YYYY:DDD:HH:MI:SS.SSSSSSS

YYYY = Four digit year

DDD = Day of year

HH = Hour (00-23)

MI = Minute

SS.SSSSSSS = Fractional seconds

Sun Azimuth

Field Definition: Sun azimuth angle (degrees) at the WRS scene center. A positive value (+) indicates angles to the East or clockwise from North. Zero indicates North. A negative value (-) indicates angles to the West or counterclockwise from North.

Values:

-180.0000000 through +180.0000000 degrees

Sun Elevation

Field Definition: Sun elevation angle (degrees) at the WRS scene center. A positive value (+) indicates a daytime scene. Zero indicates a nighttime scene. A negative value (-) indicates a nighttime scene.

Values:

- 90.0000000 through + 90.0000000 degrees

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)

WRS Type

Field Definition: WRS which applies to the acquisition.

Values:

1 = Landsat Satellites 1, 2, 3

2 = Landsat Satellites 4, 5

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U.S. Department of the Interior \| U.S. Geological Survey URL: http://edcsns17.usgs.gov/helpdocs/dict/landsat_dictionary.html Page Contact Information: custserv@usgs.gov Page Last Modified: Wednesday August 03, 2011