Object oriented classification of disturbance on raised bogs in the Irish Midlands using medium- and high-resolution satellite imagery

Climate change : positioning Ireland, positioning geography

Auteurs :
CONNOLLY, J.
HOLDEN, N.M.

Description :
Raised bogs in the Irish Midlands are spatially extensive and disturbed. Peatland disturbance is relatively easy to identify on the ground, but it is difficult to quantify and more difficult to systematise a method of isolating where disturbance has occurred. The extent of raised bogs was delineated from the Derived Irish Peat Map version 2. An object-oriented approach was used to produce maps of disturbance type from medium- (IRS) and high-resolution (Geoeye-1 and Ikonos) imagery. The main disturbance types identified were conversion to pasture, afforestation, draining, cutover and cutaway peatlands. The medium resolution imagery was useful for examining peatland disturbance over large areas, but there was added value in developing maps using highresolution imagery. The overall accuracy assessment for the disturbance maps was between 62% and 90%. This method allows for the extent and severity of disturbance to be identified, which is a critical issue for quantification and security of the peatland carbon stock. The method was applied in Ireland’s raised bogs but could be applied to peatland areas anywhere in the world.


Type de document :
Article de monographie

Source :
Irish geography (Online), issn : 1939-4055, 2011, vol. 44, n°. 1, p. 1-26, nombre de pages : 26, Références bibliographiques : 1 p.

Date :
2011

Identifiants :
eurl : http://dx.doi.org/10.1080/00750778.2011.615558, doi : http://dx.doi.org/10.1080/00750778.2011.615558

Editeur :
Pays édition : Royaume-Uni, Abingdon, Taylor and Francis