{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,5]],"date-time":"2026-06-05T11:35:47Z","timestamp":1780659347399,"version":"3.54.1"},"reference-count":41,"publisher":"MDPI AG","issue":"7","license":[{"start":{"date-parts":[[2010,7,20]],"date-time":"2010-07-20T00:00:00Z","timestamp":1279584000000},"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>During a field campaign covering the 2002 corn growing season, a dual polarized tower mounted L-band (1.4 GHz) radiometer (LRAD) provided brightness temperature (TB) measurements at preset intervals, incidence and azimuth angles. These radiometer measurements were supported by an extensive characterization of land surface variables including soil moisture, soil temperature, vegetation biomass, and surface roughness. In the period May 22 to August 30, ten days of radiometer and ground measurements are available for a corn canopy with a vegetation water content (W) range of 0.0 to 4.3 kg m\u22122. Using this data set, the effects of corn vegetation on surface emissions are investigated by means of a semi-empirical radiative transfer model. Additionally, the impact of roughness on the surface emission is quantified using TB measurements over bare soil conditions. Subsequently, the estimated roughness parameters, ground measurements and horizontally OPEN ACCESS (H)-polarized TB are employed to invert the H-polarized transmissivity (\u03b3h) for the monitored corn growing season.<\/jats:p>","DOI":"10.3390\/s100706980","type":"journal-article","created":{"date-parts":[[2010,7,21]],"date-time":"2010-07-21T02:19:50Z","timestamp":1279678790000},"page":"6980-7001","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["L Band Brightness Temperature Observations over a Corn Canopy during the Entire Growth Cycle"],"prefix":"10.3390","volume":"10","author":[{"given":"Alicia T.","family":"Joseph","sequence":"first","affiliation":[{"name":"Hydrological Sciences Branch\/614.3, Hydrospheric and Biospheric Sciences Laboratory, NASA\/Goddard Space Flight Center, Greenbelt, MD 20771, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rogier","family":"Van der Velde","sequence":"additional","affiliation":[{"name":"International Institute for Geo-Information Science and Earth Observation (ITC), Hengelsostraat 99, P.O. Box 6, 7500 AA Enschede, The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Peggy E.","family":"O\u2019Neill","sequence":"additional","affiliation":[{"name":"Hydrological Sciences Branch\/614.3, Hydrospheric and Biospheric Sciences Laboratory, NASA\/Goddard Space Flight Center, Greenbelt, MD 20771, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bhaskar J.","family":"Choudhury","sequence":"additional","affiliation":[{"name":"Hydrological Sciences Branch\/614.3, Hydrospheric and Biospheric Sciences Laboratory, NASA\/Goddard Space Flight Center, Greenbelt, MD 20771, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Roger H.","family":"Lang","sequence":"additional","affiliation":[{"name":"Department of Electrical Engineering & Computer Sciences, the George Washington University, Washington, DC 20052, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Edward  J.","family":"Kim","sequence":"additional","affiliation":[{"name":"Hydrological Sciences Branch\/614.3, Hydrospheric and Biospheric Sciences Laboratory, NASA\/Goddard Space Flight Center, Greenbelt, MD 20771, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Timothy","family":"Gish","sequence":"additional","affiliation":[{"name":"USDA-ARS Hydrology and Remote Sensing Laboratory, Building 007, BARC-WEST, Beltsville, MD 20705, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2010,7,20]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"139","DOI":"10.1002\/hyp.3360070205","article-title":"Measuring large scale surface soil moisture using passive microwave remote sensing","volume":"7","author":"Jackson","year":"1993","journal-title":"Hydrol. Process"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"639","DOI":"10.1016\/j.rse.2006.10.014","article-title":"L-band microwave emission of the biosphere (L-MEB) model: Description and calibration against experimental data sets over crop fields","volume":"107","author":"Wigneron","year":"2007","journal-title":"Remote. Sens. Environ"},{"key":"ref_3","doi-asserted-by":"crossref","unstructured":"Owe, M, De Jeu, RAM, and Holmes, TRH (2008). Multi-sensor historical climatology of satellite-derived global land surface moisture. J Geophys Res, 113, 1029\/2007JF000769.","DOI":"10.1029\/2007JF000769"},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"1304","DOI":"10.1016\/j.rse.2009.02.013","article-title":"Soil moisture retrievals at L-band using a two-step inversion approach","volume":"113","author":"Saleh","year":"2009","journal-title":"Remote. Sens. Environ"},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"435","DOI":"10.1016\/j.rse.2008.10.010","article-title":"Evaluation of the SMOS L-MEB passive microwave soil moisture retrieval algorithm","volume":"113","author":"Panciera","year":"2009","journal-title":"Remote. Sens. Environ"},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"1729","DOI":"10.1109\/36.942551","article-title":"Soil moisture retrieval from space: The soil moisture and Ocean Salinity (SMOS) mission","volume":"39","author":"Kerr","year":"2001","journal-title":"IEEE Trans. Geosci. Remot. Sen"},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"2184","DOI":"10.1109\/TGRS.2004.834631","article-title":"The Hydrosphere State (Hydros) mission: An Earth system pathfinder for global mapping of soil moisture and land freeze\/thaw","volume":"42","author":"Entekhabi","year":"2004","journal-title":"IEEE Trans. Geosci. Remot. Sen"},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"2136","DOI":"10.1109\/36.789610","article-title":"Soil moisture mapping at regional scales using microwave radiometry: The Southern Great Plains hydrology experiment","volume":"GE-37","author":"Jackson","year":"1999","journal-title":"IEEE Trans Geosci Remot Sen"},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"1643","DOI":"10.1109\/36.942542","article-title":"A methodology for surface soil moisture and vegetation optical depth retrieval using the microwave polarization difference index","volume":"39","author":"Owe","year":"2001","journal-title":"IEEE Trans. Geosci. Remot. Sen"},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"4038","DOI":"10.1029\/2002JD002176","article-title":"Determination of land surface temperature and soil moisture from tropical rainfall measuring mission\/microwave imager remote sensing data","volume":"108","author":"Wen","year":"2003","journal-title":"J. Geophys. Res"},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"1168","DOI":"10.1109\/TGRS.2004.826820","article-title":"N-parameter retrieval from L-band microwave observations acquired over a variety of crop fields","volume":"42","author":"Wigneron","year":"2004","journal-title":"IEEE Trans. Geosci. Remot. Sen"},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"639","DOI":"10.1016\/j.rse.2006.10.014","article-title":"L-band microwave emission of the biosphere (L-MEB) model: Description and calibration against experimental data sets over crop fields","volume":"107","author":"Wigneron","year":"2007","journal-title":"Remote. Sens. Environ"},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"331","DOI":"10.1016\/0034-4257(94)00081-W","article-title":"A simple algorithm to retrieve soil moisture and vegetation biomass using passive microwave measurements over crop fields","volume":"51","author":"Wigneron","year":"1995","journal-title":"Remote. Sens. Environ"},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"978","DOI":"10.1109\/36.58989","article-title":"Attenuation of soil microwave emission by corn and soybeans at 1.4 and 5 GHz","volume":"28","author":"Jackson","year":"1990","journal-title":"IEEE Trans. Geosci. Remot. Sen"},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"277","DOI":"10.1109\/LGRS.2004.834594","article-title":"Soil moisture retrievals from biangular L-band passive microwave observations","volume":"1","author":"Wigneron","year":"2004","journal-title":"IEEE Geosci. Remote. Sens. Lett"},{"key":"ref_16","first-page":"1","article-title":"The b-factor as a function of frequency and canopy type at H-polarization","volume":"42","author":"Wigneron","year":"2004","journal-title":"IEEE Geosci. Remote. Sens. Lett"},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"W2504","DOI":"10.1029\/2003WR002441","article-title":"Soil moisture retrieval during the Southern Great Plains Hydrology Experiment 1999: A comparison between experiment remote sensing data and operational products","volume":"40","author":"Drusch","year":"2004","journal-title":"Water Resour. Res"},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"242","DOI":"10.1016\/j.jhydrol.2004.10.019","article-title":"Microwave remote sensing of soil moisture: Evaluation of the TRMM microwave imager (TMI) satellite for the Little River Watershed Tifton, Georgia","volume":"307","author":"Cashion","year":"2005","journal-title":"J. Hydrol"},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"375","DOI":"10.1016\/j.rse.2007.01.024","article-title":"Aircraft based soil moisture retrievals under mixed vegetation and topographic conditions","volume":"112","author":"Bindlish","year":"2008","journal-title":"Remote. Sens. Environ"},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"203","DOI":"10.1016\/0034-4257(91)90057-D","article-title":"Vegetation effects on the microwave emission of soils","volume":"36","author":"Jackson","year":"1991","journal-title":"Remote. Sens. Environ"},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"757","DOI":"10.1109\/36.158870","article-title":"A dielectric model of the vegetation effects on the microwave emission from soils","volume":"30","author":"Schmugge","year":"1992","journal-title":"IEEE Trans. Geosci. Remot. Sen"},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"507","DOI":"10.1016\/S0034-4257(03)00052-X","article-title":"Soil moisture estimates from TRMM Microwave Imager observations over the Southern United States","volume":"85","author":"Bindlish","year":"2003","journal-title":"Remote. Sens. Environ"},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"127","DOI":"10.1016\/j.rse.2005.12.004","article-title":"Impact of rain interception by vegetation and mulch on the L-band emission of natural grass","volume":"101","author":"Saleh","year":"2006","journal-title":"Remote. Sens. Environ"},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"11229","DOI":"10.1029\/JC087iC13p11229","article-title":"A model for microwave emission from vegetation-covered fields","volume":"87","author":"Mo","year":"1982","journal-title":"J. Geophys. Res"},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"5277","DOI":"10.1029\/JC086iC06p05277","article-title":"Remote sensing of soil moisture content over bare field at 1.4 GHz frequency","volume":"86","author":"Wang","year":"1981","journal-title":"J. Geophys. Res"},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"44","DOI":"10.1109\/TGRS.1983.350529","article-title":"Multifrequency measurements of the effects of soil moisture, soil texture, and surface roughness","volume":"GE-21","author":"Wang","year":"1983","journal-title":"IEEE Trans Geosci Remot Sen"},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"62","DOI":"10.1109\/TGRS.1983.350531","article-title":"Electromagnetic backscattering from a layer of vegetation: A discrete approach","volume":"21","author":"Lang","year":"1983","journal-title":"IEEE Trans. Geosci. Remot. Sen"},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"1079","DOI":"10.1080\/014311697218584","article-title":"Soil moisture estimation under a vegetation cover: Combined active passive microwave remote sensing approach","volume":"18","author":"Chauhan","year":"1997","journal-title":"Int. J. Remote. Sens"},{"key":"ref_29","unstructured":"Njoku, EG (1999). Algorithm Theoretical Basis Documen, Jet Propulsion Laboratory, California Institute of Technology."},{"key":"ref_30","unstructured":"Kerr, YH, Waldteufel, P, Richaume, P, Davenport, I, Ferrazzoli, P, and Wigneron, JP (2006). SMOS level 2 processor soil moisture Algorithm Theoretical Basis Document (ATBD), SM-ESL (CBSA), CESBIO, Toulouse,SO-TN-ESL-SM-GS-0001, V5.a, 15\/03\/2006."},{"key":"ref_31","unstructured":"Gish, TJ, Walthall, CL, Daughtry, CST, Dulaney, WP, and Mccarty, GW (2003, January October). Watershed-Scale Sensing of Subsurface Flow Pathways at Ope3 Site. Benson, AZ, USA."},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"2365","DOI":"10.1109\/TGRS.2008.917214","article-title":"Soil moisture retrieval during a corn growth cycle using L-band (1.6 GHz) radar observations","volume":"46","author":"Joseph","year":"2008","journal-title":"IEEE Trans. Geosci. Remot. Sen"},{"key":"ref_33","unstructured":"Miller, JD, and Gaskin, GD (1996). Theta probe ML2x\u2014Principle of operation and applications, Macaulay Land Use Research Institute (MLURI). [2nd ed]."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"49","DOI":"10.1016\/j.jhydrol.2005.01.003","article-title":"Calibration of an impedance probe for estimation of surface soil water content over large regions","volume":"311","author":"Cosh","year":"2005","journal-title":"J. Hydrol"},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"35","DOI":"10.1109\/TGRS.1985.289498","article-title":"Microwave dielectic behavior of wet soil\u2014Part II: Dielectric mixing models","volume":"GE-23","author":"Dobson","year":"1985","journal-title":"IEEE Trans Geosci Remot Sen"},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"5699","DOI":"10.1029\/JC084iC09p05699","article-title":"Effect of surface roughness on microwave emission of soils","volume":"84","author":"Choudhury","year":"1979","journal-title":"J. Geophys. Res"},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"2277","DOI":"10.1109\/TGRS.2004.832243","article-title":"On the measurement of microwave vegetation properties: Some guidelines for a protocol","volume":"42","author":"Wigneron","year":"2004","journal-title":"IEEE Trans. Geosci. Remot. Sen"},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"1697","DOI":"10.1109\/36.942548","article-title":"A simple parameterization of the L-band microwave emission from rough agricultural soils","volume":"39","author":"Wigneron","year":"2001","journal-title":"IEEE Trans. Geosci. Remot. Sen"},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"1978","DOI":"10.1109\/TGRS.2007.894935","article-title":"A simple model of the bare soil microwave emission at L-band","volume":"45","author":"Escorihuela","year":"2007","journal-title":"IEEE Trans. Geosci. Remot. Sen"},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1016\/0034-4257(93)90028-V","article-title":"Reflectivities of selected land-surface types at 19 and 37 GHz from SSM\/I observations","volume":"46","author":"Choudhury","year":"1993","journal-title":"Remote. Sens. Environ"},{"key":"ref_41","doi-asserted-by":"crossref","first-page":"1090","DOI":"10.1109\/36.536525","article-title":"Dependence of attenuation in a vegetation canopy on frequency and plant water content","volume":"34","author":"Karam","year":"1996","journal-title":"IEEE Trans Geosci Remot Sen"}],"container-title":["Sensors"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1424-8220\/10\/7\/6980\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T22:02:58Z","timestamp":1760220178000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1424-8220\/10\/7\/6980"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2010,7,20]]},"references-count":41,"journal-issue":{"issue":"7","published-online":{"date-parts":[[2010,7]]}},"alternative-id":["s100706980"],"URL":"https:\/\/doi.org\/10.3390\/s100706980","relation":{},"ISSN":["1424-8220"],"issn-type":[{"value":"1424-8220","type":"electronic"}],"subject":[],"published":{"date-parts":[[2010,7,20]]}}}