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| Titel |
Global estimation of burned area using MODIS active fire observations |
| VerfasserIn |
L. Giglio, G. R. Werf, J. T. Randerson, G. J. Collatz, P. Kasibhatla |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 6, no. 4 ; Nr. 6, no. 4 (2006-03-28), S.957-974 |
| Datensatznummer |
250003624
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| Publikation (Nr.) |
 copernicus.org/acp-6-957-2006.pdf |
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| Zusammenfassung |
| We present a method for estimating monthly burned area globally at
1° spatial resolution using Terra MODIS data and
ancillary vegetation cover
information. Using regression trees constructed for 14 different global
regions, MODIS active fire observations were calibrated to burned area
estimates derived from 500-m MODIS imagery based on the assumption
that burned area is proportional to counts of fire pixels. Unlike earlier
methods, we allow the constant of proportionality to vary as a function of tree
and herbaceous vegetation cover, and the mean size of monthly cumulative
fire-pixel clusters. In areas undergoing active deforestation, we implemented
a subsequent correction based on tree cover information and a simple measure of
fire persistence. Regions showing good agreement between predicted and
observed burned area included Boreal Asia, Central Asia, Europe, and Temperate
North America, where the estimates produced by the regression trees were
relatively accurate and precise. Poorest agreement was found for
southern-hemisphere South America, where predicted values of burned area are
both inaccurate and imprecise; this is most likely a consequence of multiple
factors that include extremely persistent cloud cover, and lower
quality of the 500-m burned area maps used for calibration. Application of our
approach to the nine remaining regions yielded comparatively accurate, but
less precise, estimates of monthly burned area. We applied the regional
regression trees to the entire archive of Terra MODIS fire data to produce a
monthly global burned area data set spanning late 2000 through mid-2005.
Annual totals derived from this approach showed good agreement with independent
annual estimates available for nine Canadian provinces, the United
States, and Russia. With our data set we estimate the global annual burned
area for the years 2001-2004 to vary between 2.97 million and
3.74 million km2,
with the maximum occurring in 2001. These coarse-resolution burned area
estimates may serve as a useful interim product until long-term burned area
data sets from multiple sensors and retrieval approaches become available. |
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