After a fire, a strong reflectance decrease at optical wavelengths can be observed on satellite images, burnt areas having a lower reflectance in the near infrared channel than healthy vegetation.

The L3JRC consortium (Joint Research Center, University of Leicester, Universidade Técnica di Lisboa, Université Catholique de Louvain) have derived burnt area maps from the VEGETATION sensor by applying globally a regional algorithm developed in the framework of the GBA2000 project. The algorithm that has been applied is the modified IFI (International Forest Institute, Russia) that calculates a temporal index based on near infrared reflectance measurements and identifies rapid decreases in reflectance over a spatial window of 200 km x 200 km (Tansey, 2002; Tansey et al., 2004).

Burnt scars detected from VEGETATION data over Siberia, July 14^th 2000.

The advantage of this product over existing products is that burnt area products are available in daily time steps, at 1 km resolution over three global fire seasons.
This production is INDEPENDENT from the geoland project.

A pre-operational production line has been designed to monitor fires seasonality in near real time (every 10 days). This production chain was designed and developed in the framework of the geoland project. Every dekad, a synthesis of the occurrence of detection of a burn scars during the dekad is generated per grid cells of ½° × ½°. For each grid cell the time series of the detection is analysed and the most recent start of season (example below), peak and end of season are assessed. The resulting images of dates are updated every dekad.

The seasonality products are generated for the period from 21^st June, 2002 to 21^st June 2004 over Africa.

More details about the Burnt Areas and Seasonality products are available in the VGT4AFRICA User Manual, which can be downloaded with the products files. A technical documentation is also provided.

Date of start of the fire season, as assessed on 21^st June, 2002.

References

Tansey, K., Implementation of regional burnt area algorithms for the GBA2000 initiative. Publication of the European Commission EUR 20532, pp. 170, 2002.

Tansey, K et al., Vegetation burning in the year 2000: Global burned area estimates from SPOT VEGETATION data, Journal of Geophysical Research-Atmospheres, Vol. 109, D14S03, 2004.