Landsat 7
E413569
Landsat 7 is a NASA Earth observation satellite launched in 1999 that provides multispectral imagery for environmental monitoring, land use analysis, and global change research.
All labels observed (3)
| Label | Occurrences |
|---|---|
| Landsat 7 canonical | 4 |
| Enhanced Thematic Mapper Plus | 1 |
| Landsat 7 ETM+ | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T3918675 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Landsat 7 Context triple: [Landsat satellites, hasMember, Landsat 7]
-
A.
Landsat 5
Landsat 5 was a long-lived Earth observation satellite that provided decades of multispectral imagery for environmental monitoring and land-use analysis.
-
B.
Landsat 4
Landsat 4 was an Earth observation satellite in the Landsat program that significantly improved global land imaging with enhanced sensors and higher-resolution data.
-
C.
Landsat 6
Landsat 6 was an Earth observation satellite in the Landsat program that failed to reach orbit after its 1993 launch, resulting in the loss of its intended remote-sensing mission.
-
D.
Landsat satellites
Landsat satellites are a series of Earth-observing spacecraft that provide long-term, continuous multispectral imagery used worldwide for environmental monitoring, land-use mapping, and resource management.
-
E.
Terra satellite
Terra is a flagship NASA Earth observation satellite that carries multiple instruments to monitor the planet’s climate, land, oceans, and atmosphere from polar orbit.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Landsat 7 Target entity description: Landsat 7 is a NASA Earth observation satellite launched in 1999 that provides multispectral imagery for environmental monitoring, land use analysis, and global change research.
-
A.
Landsat 5
Landsat 5 was a long-lived Earth observation satellite that provided decades of multispectral imagery for environmental monitoring and land-use analysis.
-
B.
Landsat 4
Landsat 4 was an Earth observation satellite in the Landsat program that significantly improved global land imaging with enhanced sensors and higher-resolution data.
-
C.
Landsat 6
Landsat 6 was an Earth observation satellite in the Landsat program that failed to reach orbit after its 1993 launch, resulting in the loss of its intended remote-sensing mission.
-
D.
Landsat satellites
Landsat satellites are a series of Earth-observing spacecraft that provide long-term, continuous multispectral imagery used worldwide for environmental monitoring, land-use mapping, and resource management.
-
E.
Terra satellite
Terra is a flagship NASA Earth observation satellite that carries multiple instruments to monitor the planet’s climate, land, oceans, and atmosphere from polar orbit.
- F. None of above. chosen
Statements (50)
| Predicate | Object |
|---|---|
| instanceOf |
Earth observation satellite
ⓘ
Landsat program satellite ⓘ artificial satellite ⓘ |
| abbreviationOfPrimaryInstrument |
ETM
ⓘ
surface form:
ETM+
|
| altitude | about 705 kilometers ⓘ |
| dataDistributor |
USGS EarthExplorer
ⓘ
USGS GloVis ⓘ |
| dataPolicy | free and open data ⓘ |
| dataUse |
agricultural monitoring
ⓘ
disaster assessment ⓘ environmental monitoring ⓘ forest monitoring ⓘ global change research ⓘ land use analysis ⓘ urban growth analysis ⓘ water resources management ⓘ |
| followedBy | Landsat 8 ⓘ |
| imageryFormat | Level-1 terrain-corrected products ⓘ |
| inclination | 98.2 degrees ⓘ |
| launchCountry |
United States of America
ⓘ
surface form:
United States
|
| launchDate | 1999-04-15 ⓘ |
| launchSite | Vandenberg Air Force Base Space Launch Complex 2W ⓘ |
| launchVehicle |
Delta II
ⓘ
surface form:
Delta II 7920
|
| localTimeOfDescendingNode | 10:00 ⓘ |
| manufacturer | TRW ⓘ |
| missionDurationPlanned | 5 years ⓘ |
| missionObjective |
to continue the Landsat data record
ⓘ
to provide repetitive multispectral imagery of the Earth’s land surfaces ⓘ |
| missionType | Earth observation ⓘ |
| multispectralBandResolution | 30 meters ⓘ |
| onboardRecorder | solid-state recorder ⓘ |
| operator |
NASA
ⓘ
United States Geological Survey ⓘ |
| orbitalPeriod | 99 minutes ⓘ |
| orbitRegime | Low Earth orbit ⓘ |
| orbitType | Sun-synchronous orbit ⓘ |
| panchromaticBandResolution | 15 meters ⓘ |
| precededBy | Landsat 6 ⓘ |
| primaryInstrument | Enhanced Thematic Mapper Plus ⓘ |
| program |
Landsat satellites
ⓘ
surface form:
Landsat program
|
| registration | COSPAR ID 1999-020A ⓘ |
| repeatCycle | 16 days ⓘ |
| satcatNumber | 25682 ⓘ |
| scanLineCorrectorFailureDate | 2003-05-31 ⓘ |
| scanLineCorrectorIssue | causes data gaps in imagery ⓘ |
| spacecraftBus |
TRW
ⓘ
surface form:
TRW T-410
|
| spectralBands | 8 ⓘ |
| status | operational with degraded data ⓘ |
| swathWidth | 185 kilometers ⓘ |
| thermalBandResolution | 60 meters ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Landsat 7 Description of subject: Landsat 7 is a NASA Earth observation satellite launched in 1999 that provides multispectral imagery for environmental monitoring, land use analysis, and global change research.
Referenced by (6)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Landsat 7 ETM+
this entity surface form:
Enhanced Thematic Mapper Plus