{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,21]],"date-time":"2026-07-21T12:49:18Z","timestamp":1784638158747,"version":"3.55.0"},"reference-count":40,"publisher":"MDPI AG","issue":"7","license":[{"start":{"date-parts":[[2012,6,29]],"date-time":"2012-06-29T00:00:00Z","timestamp":1340928000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/3.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>Monitoring high latitude wetlands is required to understand feedbacks between terrestrial carbon pools and climate change. Hydrological variability is a key factor driving biogeochemical processes in these ecosystems and effective assessment tools are critical for accurate characterization of surface hydrology, soil moisture, and water table fluctuations. Operational satellite platforms provide opportunities to systematically monitor hydrological variability in high latitude wetlands. The objective of this research application was to integrate high temporal frequency Synthetic Aperture Radar (SAR) and high spatial resolution Light Detection and Ranging (LiDAR) observations to assess hydroperiod at a mire in northern Sweden. Geostatistical and polarimetric (PLR) techniques were applied to determine spatial structure of the wetland and imagery at respective scales (0.5 m to 25 m). Variogram, spatial regression, and decomposition approaches characterized the sensitivity of the two platforms (SAR and LiDAR) to wetland hydrogeomorphology, scattering mechanisms, and data interrelationships. A Classification and Regression Tree (CART), based on random forest, fused multi-mode (fine-beam single, dual, quad pol) Phased Array L-band Synthetic Aperture Radar (PALSAR) and LiDAR-derived elevation to effectively map hydroperiod attributes at the Swedish mire across an aggregated warm season (May\u2013September, 2006\u20132010). Image derived estimates of water and peat moisture were sensitive (R2 = 0.86) to field measurements of water table depth (cm). Peat areas that are underlain by permafrost were observed as areas with fluctuating soil moisture and water table changes.<\/jats:p>","DOI":"10.3390\/rs4071974","type":"journal-article","created":{"date-parts":[[2012,6,29]],"date-time":"2012-06-29T11:05:28Z","timestamp":1340967928000},"page":"1974-1994","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":31,"title":["High Resolution Mapping of Peatland Hydroperiod at a High-Latitude Swedish Mire"],"prefix":"10.3390","volume":"4","author":[{"given":"Nathan","family":"Torbick","sequence":"first","affiliation":[{"name":"Applied Geosolutions, 403 Kent Place, Newmarket, NH 03824, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Andreas","family":"Persson","sequence":"additional","affiliation":[{"name":"Department of Physical Geography and Ecosystem Sciences, Lund University, S\u00f6lvegatan 12, SE-22100 Lund, Sweden"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"David","family":"Olefeldt","sequence":"additional","affiliation":[{"name":"Department of Integrative Biology, University of Guelph, Science Complex, Guelph, ON N1G 2W1, Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Steve","family":"Frolking","sequence":"additional","affiliation":[{"name":"Earth Systems Research Center, Institute for the Study of Earth, Oceans, and Space, University of New Hampshire, 8 College Road, Durham, NH 03824, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"William","family":"Salas","sequence":"additional","affiliation":[{"name":"Applied Geosolutions, 403 Kent Place, Newmarket, NH 03824, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Stephen","family":"Hagen","sequence":"additional","affiliation":[{"name":"Applied Geosolutions, 403 Kent Place, Newmarket, NH 03824, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Patrick","family":"Crill","sequence":"additional","affiliation":[{"name":"Department of Geological Sciences, Stockholm University, 10691 Stockholm, Sweden"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Changsheng","family":"Li","sequence":"additional","affiliation":[{"name":"Earth Systems Research Center, Institute for the Study of Earth, Oceans, and Space, University of New Hampshire, 8 College Road, Durham, NH 03824, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2012,6,29]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"GB2023","DOI":"10.1029\/2008GB003327","article-title":"Soil organic carbon pools in the northern circumpolar permafrost region","volume":"23","author":"Tarnocai","year":"2009","journal-title":"Glob. Biogeochem. Cy"},{"key":"ref_2","doi-asserted-by":"crossref","unstructured":"Grosse, G., Harden, J.W., Turetsky, M.R., McGuire, A.D., Camill, P., Tarnocai, C., Frolking, S., Schuur, E.A.G., and Jorgenson, T (2011). Vulnerability of high latitude soil organic carbon in North America to disturbance. J. Geophys. Res.-Biogeosciences, 116.","DOI":"10.1029\/2010JG001507"},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"1612","DOI":"10.1126\/science.1128908","article-title":"Climate change: Permafrost and the global carbon budget","volume":"312","author":"Zimov","year":"2006","journal-title":"Science"},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"37","DOI":"10.1029\/2009EO050001","article-title":"Global methane emissions from wetlands, rice paddies, and lakes","volume":"90","author":"Zhang","year":"2009","journal-title":"EOS Trans. AGU"},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"371","DOI":"10.1139\/a11-014","article-title":"Peatlands in the Earth\u2019s 21st century climate system","volume":"19","author":"Frolking","year":"2011","journal-title":"Environ. Rev"},{"key":"ref_6","doi-asserted-by":"crossref","unstructured":"Christensen, T.R., Ekberg, A., Str\u00f6m, L., Mastepanov, M., Panikov, N., \u00d6quist, M., Svensson, B.H., Nyk\u00e4nen, H., Martikainen, P.J., and Oskarsson, H. (2003). Factors controlling large scale variations in methane emissions from wetlands. Geophys. Res. Lett, 30.","DOI":"10.1029\/2002GL016848"},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"73","DOI":"10.1089\/ees.2005.22.73","article-title":"Biogeochemistry of methane exchange between natural wetlands and the atmosphere","volume":"22","author":"Whalen","year":"2008","journal-title":"Environ. Eng. Sci"},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"176","DOI":"10.1672\/0277-5212(2005)025[0176:RMORIP]2.0.CO;2","article-title":"Remote monitoring of regional scale inundation patterns and hydroperiod in the Greater Everglades using synthetic aperture radar","volume":"25","author":"Smith","year":"2005","journal-title":"Wetlands"},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"1427","DOI":"10.1080\/01431160110092966","article-title":"The JERS Amazon Multi-Season Mapping Study (JAMMS): Observation strategies and data characteristics","volume":"23","author":"Chapman","year":"2002","journal-title":"Int. J. Remote Sens"},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"1868","DOI":"10.1016\/j.rse.2009.04.006","article-title":"Effects of soil moisture and water depth on ERS SAR backscatter measurements from an Alaskan wetland complex","volume":"113","author":"Kaisischke","year":"2009","journal-title":"Remote Sens. Environ"},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"1241","DOI":"10.1080\/01431160110092885","article-title":"Relationship between macrophyte stand variables and radar backscatter at L and C band, Tucurui reservoir, Brazil","volume":"23","author":"Novo","year":"2002","journal-title":"Int. J. Remote Sens"},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"229","DOI":"10.1002\/aqc.835","article-title":"The potential of long-wavelength satellite-12. borne radar to support implementation of the Ramsar Wetlands Convention","volume":"17","author":"Rosenqvist","year":"2007","journal-title":"Aquat. Conserv"},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"54","DOI":"10.5589\/m08-080","article-title":"Mapping vegetated wetlands of Alaska using L-band radar satellite imagery","volume":"35","author":"Whitcomb","year":"2009","journal-title":"Can. J. Remote Sens"},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"3241","DOI":"10.1109\/TGRS.2009.2018626","article-title":"Phase of target scattering for wetland characterization using polarimetric C-band SAR","volume":"47","author":"Touzi","year":"2009","journal-title":"IEEE Trans. Geosci. Remote Sens"},{"key":"ref_15","doi-asserted-by":"crossref","unstructured":"Touzi, R., Gosselin, G., and Brook, R (2011, January 24\u201328). Peatland Subsurface Water Flow Monitoring Using Polarimetric L-Band Palsar. Frascati, Italy.","DOI":"10.1109\/IGARSS.2010.5653607"},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"593","DOI":"10.1016\/j.ecss.2009.10.002","article-title":"Exploring LiDAR data for mapping the micro-topography and tidal hydro-dynamics of mangrove systems: An example from southeast Queensland, Australia","volume":"85","author":"Knight","year":"2009","journal-title":"Estuar. Coast. Shelf Sci"},{"key":"ref_17","first-page":"5497","article-title":"The use of LIDAR as a data source for digital elevation models\u2014A study of the relationship between the accuracy of digital elevation models and topographical attributes in northern peatlands","volume":"8","author":"Hasan","year":"2012","journal-title":"Hydrol. Earth Syst. Sci. Discuss"},{"key":"ref_18","doi-asserted-by":"crossref","unstructured":"Torbick, N., Salas, W., Hagen, S., and Xiao, X (2011). Monitoring rice agriculture in the Sacramento Valley, USA with multitemporal PALSAR and MODIS imagery. IEEE J. Sel. Top. Appl. Earth Obs. Remote Sens.","DOI":"10.1109\/JSTARS.2010.2091493"},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"17","DOI":"10.5589\/m11-020","article-title":"Integrating SAR and optical imagery for regional mapping of paddy rice attributes in the Poyang Lake Watershed, China","volume":"37","author":"Torbick","year":"2011","journal-title":"Can. J. Remote Sens"},{"key":"ref_20","unstructured":"Bourgeau-Chavez, L., Riordan, K., Powell, R., Miller, N., and Nowels, M (2009). Advances in Geosciences and Remote Sensing, Tech."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"567","DOI":"10.5194\/hess-13-567-2009","article-title":"Improved estimation of flood parameters by combining space based SAR data with very high resolution digital elevation data","volume":"13","author":"Zwenzner","year":"2009","journal-title":"Hydrol. Earth Syst. Sci"},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"2352","DOI":"10.1111\/j.1365-2486.2006.01267.x","article-title":"Decadal vegetation changes in a northern peatlabnd, greenhouse gas fluxes and net radiative forcing","volume":"12","author":"Johansson","year":"2006","journal-title":"Glob. Change Biol"},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"453","DOI":"10.1029\/2011EO490002","article-title":"A library of georeferenced photos from the field","volume":"92","author":"Xiao","year":"2011","journal-title":"EOS Trans. AGU"},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"L03501","DOI":"10.1029\/2011GL050355","article-title":"Net carbon accumulation of a high-latitude permafrost palsa mire similar to permafrost-free peatlands","volume":"39","author":"Olefeldt","year":"2012","journal-title":"Geophys. Res. Lett"},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"95","DOI":"10.5194\/bg-7-95-2010","article-title":"Annual carbon gas budget for a subarctic peatland, Northern Sweden","volume":"7","author":"Crill","year":"2010","journal-title":"Biogeosciences"},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"2070","DOI":"10.1109\/TGRS.2003.813846","article-title":"Texture and speckle statistics in Polarimetric SAR synthesized images","volume":"41","author":"Lee","year":"2003","journal-title":"IEEE Trans. Geosci. Remote Sens"},{"key":"ref_27","unstructured":"De Grandi, G., Leysen, M., Lee, J., and Schuler, D (1997, January 3\u20138). Radar Reflectivity Estimation Using Multiplicative SAR Scenes of the Same Target: Technique and Applications. Singapore."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"82","DOI":"10.5589\/m11-017","article-title":"Evaluation of C-band polarization diversity and polarimetry for wetland mapping","volume":"37","author":"Brisco","year":"2011","journal-title":"Can. J. Remote Sens"},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"56","DOI":"10.5589\/m07-047","article-title":"Wetland characterization using polarimetric Radasat-2 capability","volume":"33","author":"Touzi","year":"2007","journal-title":"Can. J. Remote Sens"},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"498","DOI":"10.1109\/36.485127","article-title":"A review of target decomposition theorems in radar polarimetry","volume":"34","author":"Cloude","year":"1996","journal-title":"IEEE Trans. Geosci. Remote Sens"},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"73","DOI":"10.1109\/TGRS.2006.886176","article-title":"Target scattering decomposition in terms of roll-invariant target parameters","volume":"45","author":"Touzi","year":"2007","journal-title":"IEEE Trans. Geosci. Remote Sens"},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"3076","DOI":"10.1109\/TGRS.2008.2003002","article-title":"Prediction, detection, and correction of Faraday rotation in full-polarimetric L-band SAR data","volume":"46","author":"Meyer","year":"2008","journal-title":"IEEE Trans. Geosci. Remote Sens"},{"key":"ref_33","doi-asserted-by":"crossref","unstructured":"Torbick, N., Becker, B., Hession, S., Qi, J., Roloff, G., and Stevenson, J (2010). Assessing invasive plant infestation and disturbance gradients in a freshwater wetland using a GIScience approach. Wetl. Ecol. Manag.","DOI":"10.1007\/s11273-009-9171-5"},{"key":"ref_34","unstructured":"Maguire, D, Goodchild, M, and Batty, M (2006). GIS, Spatial Analysis and Modeling, ESRI Press."},{"key":"ref_35","doi-asserted-by":"crossref","unstructured":"Ullah, A, and Giles, D (1998). Handbook of Applied Economic Statistics, Marcel Dekker.","DOI":"10.1201\/9781482269901"},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"5","DOI":"10.1023\/A:1010933404324","article-title":"Random Forest","volume":"45","author":"Breiman","year":"2001","journal-title":"Machine Learning"},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"356","DOI":"10.1016\/j.rse.2005.10.014","article-title":"Mapping invasive plants using hyperspectral imagery and Breiman Cutler classifications (RandomForest)","volume":"100","author":"Lawrence","year":"2006","journal-title":"Remote Sens. Environ"},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"1843","DOI":"10.1016\/j.rse.2009.04.015","article-title":"Monitoring of cropland practices for carbon sequestration purposes in north central Montana by Landsat remote sensing","volume":"113","author":"Watts","year":"2009","journal-title":"Remote Sens. Environ"},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"54","DOI":"10.5589\/m08-080","article-title":"Mapping wetlands of Alaska from L-band SAR imagery","volume":"35","author":"Whitcomb","year":"2009","journal-title":"Can. J. Remote Sens"},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"1895","DOI":"10.1111\/j.1365-2486.2005.01042.x","article-title":"Vegetation, climatic changes and net carbon sequestration in a north-Scandinavian subarctic mire over 30 years","volume":"11","author":"Malmer","year":"2005","journal-title":"Glob. Change Biol"}],"container-title":["Remote Sensing"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2072-4292\/4\/7\/1974\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T21:51:02Z","timestamp":1760219462000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2072-4292\/4\/7\/1974"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2012,6,29]]},"references-count":40,"journal-issue":{"issue":"7","published-online":{"date-parts":[[2012,7]]}},"alternative-id":["rs4071974"],"URL":"https:\/\/doi.org\/10.3390\/rs4071974","relation":{},"ISSN":["2072-4292"],"issn-type":[{"value":"2072-4292","type":"electronic"}],"subject":[],"published":{"date-parts":[[2012,6,29]]}}}