|
| << vorige | volgende >> |
Tijdschrift beschrijving
Alle jaargangen van het bijbehorende tijdschrift
Alle afleveringen van het bijbehorende jaargang
Alle artikelen van de bijbehorende aflevering
Details van artikel 162 van 250 gevonden artikelen
| Titel: |
Multi-temporal Mapping of Burned Forest over Canada Using Satellite-based Change Metrics |
| Auteur: |
Fraser, R. H. Fernandes, R. Latifovic, R. |
| Verschenen in: |
Geocarto international |
| Paginering: | Jaargang 18 (2003) nr. 2 pagina's 37-47 |
| Jaar: |
2003-06 |
| Inhoud: |
A procedure for continental-scale mapping of burned boreal forest at 10-day intervals was developed for application to coarse resolution satellite imagery. The basis of the technique is a multiple logistic regression model parameterized using 1998 SPOT-4 VEGETATION clear-sky composites and training sites selected across Canada. Predictor features consisted of multi-temporal change metrics based on reflectance and two vegetation indices, which were normalized to the trajectory of background vegetation to account for phenological variation. Spatial-contextual tests applied to the logistic model output were developed to remove noise and increase the sensitivity of detection. The procedure was applied over Canada for the 1998-2000 fire seasons and validated using fire surveys and burned area statistics from forest fire management agencies. The area of falsely mapped burns was found to be small (3.5% commission error over Canada), and most burns larger than 10 km2 were accurately detected and mapped (R2 = 0.90, P<0.005, n = 91 for burns in two provinces). Canada-wide satellite burned area was similar, but consistently smaller by comparison to statistics compiled by the Canadian Interagency Forest Fire Centre (by 17% in 1998, 16% in 1999, and 3% in 2000). |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 162 van 250 gevonden artikelen
| << vorige | volgende >> |