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Göteborgs universitets publikationer

Assessing the potential of multi-seasonal WorldView-2 imagery for mapping West African agroforestry tree species

Författare och institution:
Martin Karlson (-); Madelene Ostwald (Institutionen för energi och miljö, Fysisk resursteori, Chalmers & Göteborgs miljövetenskapliga centrum, GMV & Centrum för globalisering och utveckling (GCGD)); Heather Reese (-); Hugues Roméo Bazie (-); Baolidioa Tankoano (-)
Publicerad i:
International Journal of Applied Earth Observation and Geoinformation, 50 ( August ) s. 80-88
ISSN:
1569-8432
Publikationstyp:
Artikel, refereegranskad vetenskaplig
Publiceringsår:
2016
Språk:
engelska
Fulltextlänk:
Fulltextlänk (lokalt arkiv):
Under granskning
Sammanfattning (abstract):
High resolution satellite systems enable efficient and detailed mapping of tree cover, with high potential to support both natural resource monitoring and ecological research. This study investigates the capability of multi-seasonal WorldView-2 imagery to map five dominant tree species at the individual tree crown level in a parkland landscape in central Burkina Faso. The Random Forest algorithm is used for object based tree species classification and for assessing the relative importance of WorldView-2 predictors. The classification accuracies from using wet season, dry season and multi-seasonal datasets are compared to gain insights about the optimal timing for image acquisition. The multi-seasonal dataset produced the most accurate classifications, with an overall accuracy (OA) of 83.4%. For classifications based on single date imagery, the dry season (OA = 78.4%) proved to be more suitable than the wet season (OA = 68.1%). The predictors that contributed most to the classification success were based on the red edge band and visible wavelengths, in particular green and yellow. It was therefore concluded that WorldView- 2, with its unique band configuration, represents a suitable data source for tree species mapping in West African parklands. These results are particularly promising when considering the recently launched WorldView-3, which provides data both at higher spatial and spectral resolution, including shortwave infrared bands.
Ämne (baseras på Högskoleverkets indelning av forskningsämnen):
NATURVETENSKAP ->
Geovetenskap och miljövetenskap ->
Fysisk geografi
LANTBRUKSVETENSKAPER ->
Lantbruksvetenskap, skogsbruk och fiske ->
Skogsvetenskap
LANTBRUKSVETENSKAPER ->
Andra lantbruksrelaterade vetenskaper ->
Miljö- och naturvårdsvetenskap
Nyckelord:
Tree species mapping, WorldView-2, Agroforestry, Parkland, Sudano-Sahel
Postens nummer:
233690
Posten skapad:
2016-03-24 11:49
Posten ändrad:
2016-06-07 10:40

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