Validation and comparison of Terra/MODIS active fire detections from INPE and NASA/UMd algorithms
Jeffrey
Thomas
Morisette, NASA GSFC, jeff.morisette@nasa.gov
(Presenting)
Ivan
Csiszar, University of Maryland, icsiszar@hermes.geog.umd.edu
Louis
Giglio, University of Maryland, giglio@hades.gsfc.nasa.gov
Wilfrid
Schroeder, IBAMA, Wilfrid.Schroeder@ibama.gov.br
Douglas
Morton, University of Maryland, morton@geog.umd.edu
João
Antonio Raposo
Pereira, IBAMA, jraposo@ibama.gov.br
Christopher
O.
Justice, University of Maryland, justice@hermes.geog.umd.edu
The Committee on Earth Observing Satellites defines validation as “the process of assessing, by independent means, the quality of the data products derived from the system outputs”. In this validation study, the data products considered are the active fire detections from two algorithms applied to Terra/MODIS data at 1 km resolution: the standard global MOD14 algorithm developed by the MODIS fire team at NASA and UMd; and a regional algorithm from INPE. We assess the quality of these two products by comparing them to coincident fire detections derived independently from the ASTER sensor on the same Terra satellite. The high spatial resolution of ASTER (30m in the SWIR spectral region) allows for detailed spectral and visual inspection of fires throughout Brazil. This presentation describes the algorithm used to create the ASTER fire product and the statistical methods used to compare the ASTER fire map with MODIS fire detection from the INPE and NASA/UMd algorithms. Results indicate that the INPE algorithm is more conservative, finding large hot fires with few false detections; the NASA/UMd product finds many more fires, but also contains more false detections. The difference between the two algorithms appears larger for the detection of “off nadir” fires. This study provides a quantitative assessment of both products in order to guide their proper use by the various user communities.
Submetido por Jeffrey Thomas Morisette em 18-MAR-2004
Tema Científico do LBA: LC (Mudanças dos Usos da Terra e da Vegetação)