Calendrier des éco-évènements

Calendrier

Webinar: New Southern NB Wetlands Mapping/Nouvelles cartes des zones humides du sud du Nouveau-Brunswick
Mardi 14 Juillet 2020 - 10:00am - Mardi 14 Juillet 2020 
**Français à suivre./French will follow.**

This webinar organized by Prof Brigitte Leblon will discuss recently published wetlands maps of southern New Brunswick. See the abstract below for more information. This webinar will be conducted in english with bilingual slides. Meeting ID : 897 3568 1270. To join the webinar click here.

Ce webinaire organisé par la professeure Brigitte Leblon discutera des nouvelles cartes des zones humides du sud du Nouveau-Brunswick. Voir ci-dessous pour plus d'informations. Ce webinaire se fera en anglais avec des diapos bilingues. ID de réunion/Meeting ID : 897 3568 1270. Pour participer au webinaire, cliquez ici.

Abstract: Mapping wetlands with high spatial and thematic accuracy is crucial for the management and monitoring of these important ecosystems. Wetland maps in New Brunswick (NB) have traditionally been produced by the visual interpretation of aerial photographs. In this study, we used an alternative method to produce a wetland map for southern New Brunswick, Canada, by classifying a combination of Landsat 8 OLI, ALOS-1 PALSAR, Sentinel-1, and LiDAR-derived topographic metrics with the Random Forests (RF) classifier. The images were acquired in three seasons (spring, summer, and fall) with different water levels and during leaf-off/on periods. The resulting map has eleven wetland classes (open bog, shrub bog, treed bog, open fen, shrub fen, freshwater marsh, coastal marsh, shrub marsh, shrub wetland, forested wetland, and aquatic bed) plus various non-wetland classes. We achieved an overall accuracy classification of 97.67%. We compared 951 in-situ validation sites to the classified image and both the 2106 and 2019 reference maps available through Service New Brunswick. Both reference maps were produced by photo-interpretation of RGB-NIR digital aerial photographs, but the 2019 NB reference also included information from LiDAR-derived surface and ecological metrics. Of these 951 sites, 94.95% were correctly identified on the classified image, while only 63.30% and 80.02% of these sites were correctly identified on the 2016 and 2019 NB reference maps, respectively. If only the 489 wetland validation sites were considered, 96.93% of the sites were correctly identified as a wetland on the classified image, while only 58.69% and 62.17% of the sites were correctly identified as a wetland on the 2016 and 2019 NB reference maps, respectively.












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