 |
| Titel |
Meeting the challenge of mapping peatlands with remotely sensed data |
| VerfasserIn |
O. N. Krankina, D. Pflugmacher, M. Friedl, W. B. Cohen, P. Nelson, A. Baccini |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1726-4170
|
| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 5, no. 6 ; Nr. 5, no. 6 (2008-12-23), S.1809-1820 |
| Datensatznummer |
250002943
|
| Publikation (Nr.) |
 copernicus.org/bg-5-1809-2008.pdf |
|
|
|
|
|
| Zusammenfassung |
| Boreal peatlands play a major role in carbon and water cycling and other
global environmental processes but understanding this role is constrained by
inconsistent representation of peatlands on, or omission from, many global
land cover maps. The comparison of several widely used global and
continental-scale databases on peatland distribution with a detailed map for
the St. Petersburg region of Russia showed significant under-reporting of
peatland area, or even total omission. Analysis of the spatial agreement and
disagreement with the detailed regional map indicated that the error of
comission (overestimation) was significantly lower than the error of
omission (underestimation) which means, that overall, peatlands were
correctly classified as such in coarse resolution datasets but a large
proportion (74–99%) was overlooked. The coarse map resolution alone
caused significant omission of peatlands in the study region. In comparison
to categorical maps, continuous field mapping approach utilizing MODIS
sensor data showed potential for a greatly improved representation of
peatlands on coarse resolution maps. Analysis of spectral signatures of
peatlands with different types of surface vegetation suggested that improved
mapping of boreal peatlands on categorical maps is feasible. The lower
reflectance of treeless peatlands in the near- and shortwave-infrared parts
of the electromagnetic spectrum is consistent with the spectral signature of
sphagnum mosses. However, when trees are present, the canopy architecture
appears to be more important in defining the overall spectral reflectance of
peatlands. A research focus on developing remote sensing methods for boreal
peatlands is needed for adequate characterization of their global
distribution. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|