{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,5]],"date-time":"2026-10-05T21:02:23Z","timestamp":1791234143863,"version":"4.1.0"},"reference-count":41,"publisher":"MDPI AG","issue":"5","license":[{"start":{"date-parts":[[2008,5,26]],"date-time":"2008-05-26T00:00:00Z","timestamp":1211760000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/3.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>Remote sensing offers a cost efficient means for identifying and monitoring wetlands over a large area and at different moments in time. In this study, we aim at providing ecologically relevant information on characteristics of temporary and permanent isolated open water wetlands, obtained by standard techniques and relatively cheap imagery. The number, surface area, nearest distance, and dynamics of isolated temporary and permanent wetlands were determined for the Western Cape, South Africa. Open water bodies (wetlands) were mapped from seven Landsat images (acquired during 1987 \u2013 2002) using supervised maximum likelihood classification. The number of wetlands fluctuated over time. Most wetlands were detected in the winter of 2000 and 2002, probably related to road constructions. Imagery acquired in summer contained fewer wetlands than in winter. Most wetlands identified from Landsat images were smaller than one hectare. The average distance to the nearest wetland was larger in summer. In comparison to temporary wetlands, fewer, but larger permanent wetlands were detected. In addition, classification of non-vegetated wetlands on an Envisat ASAR radar image (acquired in June 2005) was evaluated. The number of detected small wetlands was lower for radar imagery than optical imagery (acquired in June 2002), probably because of deterioration of the spatial information content due the extensive pre-processing requirements of the radar image. Both optical and radar classifications allow to assess wetland characteristics that potentially influence plant and animal metacommunity structure. Envisat imagery, however, was less suitable than Landsat imagery for the extraction of detailed ecological information, as only large wetlands can be detected. This study has indicated that ecologically relevant data can be generated for the larger wetlands through relatively cheap imagery and standard techniques, despite the relatively low resolution of Landsat and Envisat imagery. For the characterisation of very small wetlands, high spatial resolution optical or radar images are needed. This study exemplifies the benefits of integrating remote sensing and ecology and hence stimulates interdisciplinary research of isolated wetlands.<\/jats:p>","DOI":"10.3390\/s8053542","type":"journal-article","created":{"date-parts":[[2008,5,28]],"date-time":"2008-05-28T02:58:02Z","timestamp":1211943482000},"page":"3542-3556","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":48,"title":["Remote Sensing and Wetland Ecology: a South African Case Study"],"prefix":"10.3390","volume":"8","author":[{"given":"Els R.","family":"De Roeck","sequence":"first","affiliation":[{"name":"Laboratory of Aquatic Ecology and Evolutionary Biology, Katholieke Universiteit Leuven, Charles Deberiotstraat 32, 3000 Leuven, Belgium"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4116-8881","authenticated-orcid":false,"given":"Niko E.C.","family":"Verhoest","sequence":"additional","affiliation":[{"name":"Laboratory of Hydrology and Water Management, Ghent University, Coupure links 653, 9000 Ghent, Belgium"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mtemi H.","family":"Miya","sequence":"additional","affiliation":[{"name":"Laboratory of Aquatic Ecology and Evolutionary Biology, Katholieke Universiteit Leuven, Charles Deberiotstraat 32, 3000 Leuven, Belgium"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hans","family":"Lievens","sequence":"additional","affiliation":[{"name":"Laboratory of Hydrology and Water Management, Ghent University, Coupure links 653, 9000 Ghent, Belgium"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Okke","family":"Batelaan","sequence":"additional","affiliation":[{"name":"Department of Hydrology and Hydraulic Engineering, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium"},{"name":"Department of Earth and Environmental Sciences, Katholieke Universiteit Leuven, Celestijnenlaan 200e - bus 2410, 3001 Heverlee, Belgium"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Abraham","family":"Thomas","sequence":"additional","affiliation":[{"name":"Department of Earth Sciences, University of the Western Cape, P Bag X17, Bellville 7535, Cape Town, South Africa"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Luc","family":"Brendonck","sequence":"additional","affiliation":[{"name":"Laboratory of Aquatic Ecology and Evolutionary Biology, Katholieke Universiteit Leuven, Charles Deberiotstraat 32, 3000 Leuven, Belgium"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2008,5,26]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"113","DOI":"10.1046\/j.1365-2427.1997.00156.x","article-title":"Landscape approaches to the analysis of aquatic ecosystems","volume":"37","author":"Johnson","year":"1997","journal-title":"Freshwat. Biol."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"465","DOI":"10.1672\/0277-5212(2006)26[465:MWARAU]2.0.CO;2","article-title":"Mapping wetlands and riparian areas using Landsat ETM+ imagery and decision-tree-based models","volume":"26","author":"Baker","year":"2006","journal-title":"Wetlands"},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"610","DOI":"10.1672\/0277-5212(2007)27[610:CDOWEU]2.0.CO;2","article-title":"Change detection of wetland ecosystems using Landsat imagery and change vector analysis","volume":"27","author":"Baker","year":"2007","journal-title":"Wetlands"},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"535","DOI":"10.1641\/0006-3568(2004)054[0535:LRIEAO]2.0.CO;2","article-title":"Landsat's role in ecological applications of remote sensing","volume":"54","author":"Cohen","year":"2004","journal-title":"BioScience"},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"381","DOI":"10.1023\/A:1020908432489","article-title":"Satellite remote sensing of wetlands","volume":"10","author":"Ozesmi","year":"2002","journal-title":"Wetlands Ecol. Manage."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"2516","DOI":"10.1109\/TGRS.2005.852082","article-title":"Multisensor approach to determine changes of wetland characteristics in semiarid environments (central Spain)","volume":"43","author":"Schmid","year":"2005","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"325","DOI":"10.1046\/j.1526-100X.2003.00182.x","article-title":"A comparison of remote sensing and ground based methods for monitoring wetlands restoration","volume":"11","author":"Shuman","year":"2003","journal-title":"Restor. Ecol."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"306","DOI":"10.1016\/S0169-5347(03)00070-3","article-title":"Remote sensing for biodiversity science and conservation","volume":"18","author":"Turner","year":"2003","journal-title":"Trends Ecol. Evol."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"379","DOI":"10.1016\/j.ecolmodel.2005.10.033","article-title":"A comparison of the classification of wetland characteristics by linear spectral mixture modelling and traditional hard classifiers on multispectral remotely sensed imagery in southern India","volume":"194","author":"Shanmugam","year":"2006","journal-title":"Ecol. Model."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"404","DOI":"10.1016\/j.rse.2003.04.001","article-title":"Dual \u2013 season mapping of wetland inundations and vegetation for the Central Amazon basin","volume":"87","author":"Hess","year":"2003","journal-title":"Remote Sens. Environ."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"1787","DOI":"10.1080\/014311600209742","article-title":"Wetland change detection on the Kafue Flats, Zambia, by classification of a multitemporal remote sensing image dataset","volume":"21","author":"Munyati","year":"2000","journal-title":"Int. J. Remote Sens."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"371","DOI":"10.1046\/j.1442-9993.2001.01122.x","article-title":"Distribution and persistence of temporary wetland habitats in arid Australia in relation to climate","volume":"26","author":"Roshier","year":"2001","journal-title":"Austral Ecol."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"174","DOI":"10.1016\/j.rse.2005.03.012","article-title":"Towards operational monitoring of a northern wetland using geomatics-based techniques","volume":"97","author":"Pietroniro","year":"2005","journal-title":"Remote Sens. Environ."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"511","DOI":"10.1641\/0006-3568(2004)054[0511:HSRRSD]2.0.CO;2","article-title":"High spatial resolution remotely sensed data for ecosystem characterization","volume":"54","author":"Wulder","year":"2004","journal-title":"BioScience"},{"key":"ref_15","first-page":"1","article-title":"Remote sensing of wetland on a global scale","volume":"42","author":"Melack","year":"2004","journal-title":"SIL News: Int. Assoc. Theor. Appl. Limnol."},{"key":"ref_16","unstructured":"Lillesand, T.M., Kieffer, W.R., and Chipman, J.W. (2004). Remote Sensing and Image Interpretation., John Wiley & Sons Inc.. [Fifth edition]."},{"key":"ref_17","first-page":"1461","article-title":"Water body detection and delineation with Landsat TM data","volume":"66","author":"Frazier","year":"2000","journal-title":"Photogramm. Eng. Remote Sensing"},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"13","DOI":"10.1016\/j.rse.2005.12.002","article-title":"Estimating chlorophyll a concentrations from remote-sensing reflectance in optically shallow waters","volume":"101","author":"Cannizzaro","year":"2006","journal-title":"Remote Sens. Environ."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"171","DOI":"10.1016\/S0924-2716(02)00120-X","article-title":"Towards airborne remote sensing of water quality in The Netherlands\u2014validation and error analysis","volume":"57","author":"Hakvoort","year":"2002","journal-title":"ISPRS J. Photogramm. Remote Sens."},{"key":"ref_20","unstructured":"Henderson, F., and Lewis, A. (1998). Principles and Applications of Imaging Radar \u2013 Manual of Remote Sensing, John Wiley & Sons Inc.. [Third edition]."},{"key":"ref_21","unstructured":"Woodhouse, I. (2006). Introduction to Microwave and Remote Sensing, Taylor and Francis Ltd."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"2388","DOI":"10.4319\/lo.2006.51.5.2388","article-title":"The global abundance and size distribution of lakes, ponds, and impoundments","volume":"51","author":"Downing","year":"2006","journal-title":"Limnol. Oceanogr."},{"key":"ref_23","unstructured":"Day, J., Siegfried, W.R., Louw, G.N., and Jarman, M.L. (1979). Fynbos Ecology: a Preliminary Synthesis, CSIR."},{"key":"ref_24","unstructured":"Eastman, J.R. (2006). IDRISI 15: The Andes Edition, Clark University."},{"key":"ref_25","unstructured":"Statsoft, I. (2006). Statistica 7, Statsoft Inc."},{"key":"ref_26","unstructured":"ESRI (2006). ArcView GIS 9.2, Environmental Systems Research Institute, Inc."},{"key":"ref_27","unstructured":"ESA (European Space Agency) online: http:\/\/envisat.esa.int\/handbooks\/asar\/03.31."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"157","DOI":"10.1109\/TPAMI.1982.4767223","article-title":"A model for radar images and its application to adaptive digital filtering of multiplicative noise","volume":"PAMI-4","author":"Frost","year":"1982","journal-title":"IEEE Trans Pattern Anal Mach Intell"},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"992","DOI":"10.1109\/36.62623","article-title":"Adaptive speckle filters and scene heterogeneity","volume":"28","author":"Lopes","year":"1990","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_30","unstructured":"(2003). eCognition 3.0 Object-oriented Image Classification Software., Definiens Imaging GMBH."},{"key":"ref_31","first-page":"65","article-title":"The distribution of wetlands in the South-Western Cape Province, South Africa","volume":"17","author":"Silberbauer","year":"1991","journal-title":"South Afr. J. Aquat. Sci."},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"251","DOI":"10.1023\/A:1008904421948","article-title":"Waterbird assemblages and associated habitat characteristics of farm ponds in the Western Cape, South Africa","volume":"10","author":"Froneman","year":"2001","journal-title":"Biodivers. Conserv."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"314","DOI":"10.1046\/j.1523-1739.2000.98608.x","article-title":"Wetland loss and biodiversity conservation","volume":"14","author":"Gibbs","year":"2000","journal-title":"Conserv. Biol."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"757","DOI":"10.1111\/j.1365-2656.2006.01096.x","article-title":"Urban amphibian assemblages as metacommunities","volume":"75","author":"Parris","year":"2006","journal-title":"J. Anim. Ecol."},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"676","DOI":"10.4319\/lo.2007.52.2.0676","article-title":"Direct and indirect measures of dispersal in the fairy shrimp Branchipodopsis wolfi indicate a small-scale isolation-by-distance pattern","volume":"52","author":"Hulsmans","year":"2007","journal-title":"Limnol. Oceanogr."},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"1255","DOI":"10.1111\/j.0030-1299.2007.15860.x","article-title":"The role of metacommunity processes in shaping invertebrate rock pool communities along a dispersal gradient","volume":"116","author":"Vanschoenwinkel","year":"2007","journal-title":"Oikos"},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"1129","DOI":"10.1046\/j.1523-1739.1998.98166.x","article-title":"Are small, isolated wetlands expendable?","volume":"12","author":"Semlitsch","year":"1998","journal-title":"Conserv. Biol."},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"1447","DOI":"10.1046\/j.1523-1739.1999.98016.x","article-title":"Extirpation and recolonization in a metapopulation of an endangered fish, the tidewater goby","volume":"13","author":"Lafferty","year":"1999","journal-title":"Conserv. Biol."},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"619","DOI":"10.1046\/j.1523-1739.2002.00512.x","article-title":"Critical elements for biologically based recovery plans of aquatic-breeding amphibians","volume":"16","author":"Semlitsch","year":"2002","journal-title":"Conserv. Biol."},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"267","DOI":"10.1023\/A:1008088429081","article-title":"Scale-dependent habitat use in three species of prairie wetland birds","volume":"14","author":"Naugle","year":"1999","journal-title":"Landscape Ecol."},{"key":"ref_41","doi-asserted-by":"crossref","first-page":"749","DOI":"10.1111\/j.1523-1739.1998.97102.x","article-title":"Avian movements and wetland connectivity in landscape conservation","volume":"12","author":"Haig","year":"1998","journal-title":"Conserv. Biol."}],"container-title":["Sensors"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1424-8220\/8\/5\/3542\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T22:20:38Z","timestamp":1760221238000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1424-8220\/8\/5\/3542"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2008,5,26]]},"references-count":41,"journal-issue":{"issue":"5","published-online":{"date-parts":[[2008,5]]}},"alternative-id":["s8053542"],"URL":"https:\/\/doi.org\/10.3390\/s8053542","relation":{},"ISSN":["1424-8220"],"issn-type":[{"value":"1424-8220","type":"electronic"}],"subject":[],"published":{"date-parts":[[2008,5,26]]}}}