SAFARI 2000 Plant Area Index Estimates from Hemispherical Photos

Southern Africa's Kalahari Transect vegetation structure is documented through Plant Area Index (PAI) estimates derived from hemispherical photographs. Data were collected during the SAFARI 2000 campaign's wet and dry seasons of 2000 at sites in Zambia and Botswana. The National Aeronautics and Space Administration processed the photographs using an unsupervised classification scheme and Miller's formula to calculate PAI from gap fraction data.

Use Cases

• Calibrating and validating satellite-based leaf area index (LAI) products for southern African savannas using the ground-truthed PAI measurements.
• Analyzing seasonal changes in canopy structure by comparing wet season (Feb-Mar) and dry season (Sep) PAI data from the Mongu site.
• Studying spatial vegetation gradients along the Kalahari Transect using PAI estimates from the Mongu, Pandematenga, and Tshane field sites.
• Applying the gap fraction estimation methodology, which divides azimuth sectors into 72 segments, to reduce underestimation in clumped canopies for canopy modeling.

Strengths

• Data collection follows a standardized protocol with photographs taken every 25 meters along three 750-meter transects per site.
• Processing applies a specific methodology (van Gardingen et al., 1999) and Miller's (1967) formula to derive PAI from gap fractions.
• Covers both wet and dry seasons in 2000, allowing for analysis of seasonal canopy dynamics.

Limitations

• Exact row count, file size, and complete column names are not provided by any source.
• Conflict exists on the 'last updated' date: Data.gov lists 2026-03-12, while NASA Earthdata lists 2000-09-30.
• The license is ambiguously listed as 'other-license-specified' without further details.

Provenance

Source

National Aeronautics and Space Administration

Collection Method

Hemispherical photographs collected with a Nikon Coolpix 950 digital camera and fish-eye lens on a tripod, processed via unsupervised classification.

Time Range

February 2000 to September 2000

Freshness

2026-03 12 21:47:04.039037

Geography

Kalahari Transect, specifically Mongu (Zambia) and Pandematenga/Kasane and Tshane (Botswana)