NASA SMAPVEX08: Soil Moisture Validation Data from Field and Satellite Campaign

NASA's SMAPVEX08 project collected in situ vegetation, land cover, soil texture, and microwave backscatter data to validate satellite soil moisture estimates. The data set includes vegetation water content maps derived from SPOT-4 satellite imagery and field samples from a range of vegetation types. Data were collected during the 2008 campaign to coincide with overpasses from satellites like Landsat TM5 and MODIS/Terra.

Use Cases

• Validate satellite-derived soil moisture products based on in situ field survey data.
• Model vegetation water content at a regional scale based on NDWI calculations from SPOT-4 imagery.
• Calibrate microwave remote sensing instruments using aircraft-collected backscatter and brightness temperature data.
• Analyze the relationship between land cover classification and soil texture parameters for environmental studies.

Strengths

• Data collection was designed to coincide with satellite overpasses, likely ensuring temporal alignment for validation.
• Includes multiple complementary data types: in situ vegetation, land cover, soil texture, surface roughness, and aircraft microwave data.
• Released under the permissive CC-BY-4.0 license.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count and dataset size are unknown, which may limit suitability assessment.
• Last update date is unknown; freshness unverified.

Provenance

Source

NASA, likely from the Soil Moisture Active Passive Validation Experiment 2008 (SMAPVEX08).

Collection Method

Field surveys, satellite imagery analysis, and aircraft instrument data collection.

Time Range

2008, centered around the campaign timeline and an SPOT-4 overpass on 11 October 2008.

Freshness

Data is from a 2008 campaign; temporal coverage is likely limited to that period.

Geography

Regional study areas, likely within the conterminous United States as indicated by the soil texture data source.