{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,2]],"date-time":"2026-06-02T22:30:03Z","timestamp":1780439403667,"version":"3.54.1"},"reference-count":58,"publisher":"MDPI AG","issue":"8","license":[{"start":{"date-parts":[[2020,4,20]],"date-time":"2020-04-20T00:00:00Z","timestamp":1587340800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>In this paper, we have presented a methodology combining ground penetrating radar (GPR) and a low-cost GPS receiver for three-dimensional detection of tree roots. This research aims to provide an effective and affordable testing tool to assess the root system of a number of trees. For this purpose, a low-cost GPS receiver was used, which recorded the approximate position of each GPR track, collected with a 500 MHz RAMAC shielded antenna. A dedicated post-processing methodology based on the precise position of the satellite data, satellite clock offsets data, and a local reference Global Navigation Satellite System (GNSS) Earth Observation Network System (GEONET) Station close to the survey site was developed. Firstly, the positioning information of local GEONET stations was used to filter out the errors caused by satellite position error, satellite clock offset, and ionosphere. In addition, the advanced Kalman filter was designed to minimise receiver offset and the multipath error, in order to obtain a high precision position of each GPR track. Kirchhoff migration considering near-field effect was used to identify the three-dimensional distribution of the root. In a later stage, a novel processing scheme was used to detect and clearly map the coarse roots of the investigated tree. A successful case study is proposed, which supports the following premise: the current scheme is an affordable and accurate mapping method of the root system architecture.<\/jats:p>","DOI":"10.3390\/rs12081300","type":"journal-article","created":{"date-parts":[[2020,4,21]],"date-time":"2020-04-21T04:49:38Z","timestamp":1587444578000},"page":"1300","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":23,"title":["Mapping and Assessment of Tree Roots Using Ground Penetrating Radar with Low-Cost GPS"],"prefix":"10.3390","volume":"12","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5109-4866","authenticated-orcid":false,"given":"Lilong","family":"Zou","sequence":"first","affiliation":[{"name":"School of Computing and Engineering, University of West London (UWL), London W5 5RF, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yan","family":"Wang","sequence":"additional","affiliation":[{"name":"Department of Earth and Space Sciences, Southern University of Science and Technology, Shenzhen 518055, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Iraklis","family":"Giannakis","sequence":"additional","affiliation":[{"name":"School of Computing and Engineering, University of West London (UWL), London W5 5RF, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0291-9937","authenticated-orcid":false,"given":"Fabio","family":"Tosti","sequence":"additional","affiliation":[{"name":"School of Computing and Engineering, University of West London (UWL), London W5 5RF, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Amir M.","family":"Alani","sequence":"additional","affiliation":[{"name":"School of Computing and Engineering, University of West London (UWL), London W5 5RF, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Motoyuki","family":"Sato","sequence":"additional","affiliation":[{"name":"Center for Northeast Asian Studies, Tohoku University, Sendai 9808576, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2020,4,20]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1139","DOI":"10.1093\/jxb\/46.9.1139","article-title":"Responses of young trees to wind and shading: Effects on root architecture","volume":"46","author":"Stokes","year":"1995","journal-title":"J. Exp. Bot."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"171","DOI":"10.1007\/BF02182653","article-title":"Root architecture and tree stability","volume":"71","author":"Coutts","year":"1983","journal-title":"Plant Soil"},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1080\/03071375.1982.9746543","article-title":"A new non-destructive method for determining internal wood condition and decay in living trees. Part 1. Principles, method, and apparatus","volume":"6","author":"Habermehl","year":"1982","journal-title":"Arboric. J."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"121","DOI":"10.1080\/03071375.1982.9746558","article-title":"A new non-destructive method for determining internal wood condition and decay in living trees. II: Results and further developments","volume":"6","author":"Habermehl","year":"1982","journal-title":"Arboric. J."},{"key":"ref_5","doi-asserted-by":"crossref","unstructured":"Daniels, D.J. (2004). Ground Penetrating Radar, Institution of Engineering and Technology. [2nd ed.].","DOI":"10.1049\/PBRA015E"},{"key":"ref_6","unstructured":"Harry, M.J. (2009). Ground Penetrating Radar: Theory and Application, Elsevier Science. [1st ed.]."},{"key":"ref_7","first-page":"527","article-title":"Ground-penetrating radar: An introduction for archaeologists","volume":"54","author":"Vore","year":"1997","journal-title":"Geoarchaeology"},{"key":"ref_8","first-page":"2265","article-title":"Automated GPR rebar analysis for robotic bridge deck evaluation","volume":"46","author":"Kaur","year":"2015","journal-title":"IEEE Control Syst. Lett."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1109\/TGRS.2019.2961772","article-title":"On the Use of Lateral Wave for the Interlayer Debonding Detecting in an Asphalt Airport Pavement Using a Multistatic GPR System","volume":"58","author":"Zou","year":"2020","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1002\/1099-0763(200103)8:1<1::AID-ARP149>3.0.CO;2-N","article-title":"Archaeological investigation in Sendai Castle using ground-penetrating radar","volume":"8","author":"Zhou","year":"2001","journal-title":"Archaeol. Prospect."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"7","DOI":"10.3997\/1873-0604.2003011","article-title":"GPR using an array antenna for landmine detection","volume":"2","author":"Sato","year":"2004","journal-title":"Near Surf. Geophys."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"75A103","DOI":"10.1190\/1.3480619","article-title":"Surface and borehole ground-penetrating-radar developments","volume":"75","author":"Slob","year":"2010","journal-title":"Geophysics"},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"125","DOI":"10.1093\/treephys\/19.2.125","article-title":"Mapping tree root systems with ground-penetrating radar","volume":"19","author":"Hruska","year":"1999","journal-title":"Tree Physiol."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"1269","DOI":"10.1093\/treephys\/21.17.1269","article-title":"Use of ground-penetrating radar to study tree roots in the southeastern United States","volume":"21","author":"Butnor","year":"2001","journal-title":"Tree Physiol."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"1323","DOI":"10.1093\/treephys\/24.12.1323","article-title":"Detection of tree roots and determination of root diameters by ground penetrating radar under optimal conditions","volume":"24","author":"Barton","year":"2004","journal-title":"Tree Physiol."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"1607","DOI":"10.2136\/sssaj2003.1607","article-title":"Utility of ground-penetrating radar as a root biomass survey tool in forest systems","volume":"67","author":"Butnor","year":"2003","journal-title":"J. Soil Sci."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"15","DOI":"10.1007\/s11104-008-9845-4","article-title":"Limiting factors in the detection of tree roots using ground-penetrating radar","volume":"319","author":"Hirano","year":"2009","journal-title":"Plant Soil."},{"key":"ref_18","first-page":"1047","article-title":"Preliminary use of ground-penetrating radar and electrical resistivity tomography to study tree roots in pine forests and poplar plantations","volume":"35","author":"Zenone","year":"2008","journal-title":"Plant Physiol."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"2080","DOI":"10.1109\/JSTARS.2019.2912339","article-title":"Hybrid Polarimetric GPR Calibration and Elongated Object Orientation Estimation","volume":"12","author":"Liu","year":"2019","journal-title":"IEEE J. Sel. Top. Appl. Earth. Obs. Remote Sens."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"3410","DOI":"10.1109\/TGRS.2012.2224351","article-title":"Estimating tree-root biomass in different depths using ground-penetrating radar: Evidence from a controlled experiment","volume":"51","author":"Cui","year":"2012","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_21","first-page":"135","article-title":"Coarse root distribution of a semi-arid oak savanna estimated with ground penetrating radar","volume":"118","author":"Koteen","year":"2013","journal-title":"J. Geophys. Res. Earth Surf."},{"key":"ref_22","doi-asserted-by":"crossref","unstructured":"Li, W., Cui, X., Guo, L., Chen, J., Chen, X., and Cao, X. (2016). Tree Root Automatic Recognition in Ground Penetrating Radar Profiles Based on Randomized Hough Transform. Remote Sens., 8.","DOI":"10.3390\/rs8050430"},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"268","DOI":"10.1071\/EG09034","article-title":"The use of three geophysical methods for 3D images of total root volume of soil in urban environments","volume":"41","author":"Leucci","year":"2010","journal-title":"Explor. Geophys."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"317","DOI":"10.1007\/s11104-013-1798-6","article-title":"Root orientation can affect detection accuracy of ground-penetrating radar","volume":"373","author":"Tanikawa","year":"2013","journal-title":"Plant Soil."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"605","DOI":"10.1007\/s10712-019-09548-6","article-title":"Recent advances in tree root mapping and assessment using non-destructive testing methods: A focus on ground penetrating radar","volume":"41","author":"Alani","year":"2020","journal-title":"Surv. Geophys."},{"key":"ref_26","first-page":"107","article-title":"GPR applications in mapping the subsurface root system of street trees with road safety-critical implications","volume":"44","author":"Tosti","year":"2018","journal-title":"Adv. Trans. Stud."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"5754","DOI":"10.3390\/rs6065754","article-title":"3D Ground Penetrating Radar to Detect Tree Roots and Estimate Root Biomass in the Field","volume":"6","author":"Zhu","year":"2014","journal-title":"Remote Sens."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"130","DOI":"10.1109\/TGRS.2006.882253","article-title":"Integration of ground-penetrating radar and laser position sensors for real-time 3-D data fusion","volume":"45","author":"Grasmueck","year":"2007","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"3792","DOI":"10.1109\/TGRS.2010.2048332","article-title":"On the potential of kinematic GPR surveying using a self-tracking total station: Evaluating system crosstalk and latency","volume":"48","author":"Tronicke","year":"2010","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"367","DOI":"10.1016\/j.jappgeo.2008.05.003","article-title":"Resolution of GPR bowtie antennas: An experimental approach","volume":"67","author":"Rial","year":"2009","journal-title":"J. Appl. Geophys."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"672","DOI":"10.1016\/j.jas.2010.01.013","article-title":"Improving the interpretability of 3D GPR data using target-specific attributes: Application to tomb detection","volume":"37","author":"Tronicke","year":"2010","journal-title":"J. Archaeol. Sci."},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"11","DOI":"10.1046\/j.1365-2478.2004.00397.x","article-title":"Modelling of GPR waves for lossy media obeying a complex power law of frequency for dielectric permittivity","volume":"52","author":"Bano","year":"2004","journal-title":"Geophys. Prospect."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"K9","DOI":"10.1190\/1.2159052","article-title":"Ground-penetrating radar tomography for soil-moisture heterogeneity","volume":"71","author":"Hanafy","year":"2005","journal-title":"Geophysics"},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"3","DOI":"10.1109\/JPROC.1999.736338","article-title":"Special issue on global positioning system","volume":"87","author":"Misra","year":"1999","journal-title":"Proc. IEEE."},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"191","DOI":"10.1007\/s00190-008-0300-3","article-title":"The international GNSS service in a changing landscape of global navigation satellite systems","volume":"83","author":"Dow","year":"2009","journal-title":"J. Geod."},{"key":"ref_36","unstructured":"Groves, P.D. (2013). Principles of GNSS, Inertial, and Multisensor Integrated Navigation Systems, Artech House."},{"key":"ref_37","unstructured":"Hofmann-Wellenhof, B., Lichtenegger, H., and Wasle, E. (2007). GNSS\u2013Global Navigation Satellite Systems: GPS, GLONASS, Galileo, and More, Springer Science & Business Media."},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"1645","DOI":"10.1016\/j.asr.2011.01.036","article-title":"Remote sensing using GNSS signals: Current status and future directions","volume":"47","author":"Jin","year":"2011","journal-title":"Adv. Space Res."},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"1902","DOI":"10.1109\/JPROC.2008.2006090","article-title":"Evolution of the global navigation satellitesystem (gnss)","volume":"96","author":"Hegarty","year":"2008","journal-title":"Proc. IEEE"},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"433","DOI":"10.1007\/s00190-010-0380-8","article-title":"Integer least-squares theory for the GNSS compass","volume":"84","author":"Teunissen","year":"2010","journal-title":"J. Geod."},{"key":"ref_41","doi-asserted-by":"crossref","first-page":"191","DOI":"10.1002\/navi.64","article-title":"Differential code bias estimation using multi-GNSS observations and global ionosphere maps","volume":"61","author":"Montenbruck","year":"2014","journal-title":"Navig. J. Inst. Navig."},{"key":"ref_42","doi-asserted-by":"crossref","first-page":"259","DOI":"10.1007\/s00190-006-0106-0","article-title":"Higher order ionospheric effects in precise GNSS positioning","volume":"81","author":"Hoque","year":"2007","journal-title":"J. Geod."},{"key":"ref_43","doi-asserted-by":"crossref","first-page":"541","DOI":"10.1007\/s10291-012-0279-3","article-title":"M_DCB: Matlab code for estimating GNSS satellite and receiver differential code biases","volume":"16","author":"Jin","year":"2012","journal-title":"GPS Solut."},{"key":"ref_44","doi-asserted-by":"crossref","first-page":"359","DOI":"10.1109\/LSP.2006.888360","article-title":"Maximum likelihood estimation of position in GNSS","volume":"14","author":"Closas","year":"2007","journal-title":"IEEE Signal Process. Lett."},{"key":"ref_45","doi-asserted-by":"crossref","first-page":"209","DOI":"10.1007\/s00190-015-0867-4","article-title":"Determination of differential code biases with multi-GNSS observations","volume":"90","author":"Wang","year":"2016","journal-title":"J. Geod."},{"key":"ref_46","doi-asserted-by":"crossref","first-page":"21","DOI":"10.1061\/(ASCE)0733-9453(2008)134:1(21)","article-title":"GNSS differential positioning by robust estimation","volume":"134","author":"Baselga","year":"2008","journal-title":"J. Surv. Eng."},{"key":"ref_47","doi-asserted-by":"crossref","first-page":"411","DOI":"10.1179\/1752270614Y.0000000121","article-title":"Analysis of ill posedness in double differential ambiguity resolution of BDS","volume":"46","author":"Pan","year":"2014","journal-title":"Surv. Rev."},{"key":"ref_48","doi-asserted-by":"crossref","first-page":"15","DOI":"10.1109\/TITS.2011.2178832","article-title":"Collaborative vision-integrated pseudorange error removal: Team-estimated differential GNSS corrections with no stationary reference receiver","volume":"13","author":"Rife","year":"2011","journal-title":"IEEE Trans. Intell. Transp. Syst."},{"key":"ref_49","doi-asserted-by":"crossref","first-page":"51","DOI":"10.1007\/s00190-008-0231-z","article-title":"Consideration of time-correlated errors in a Kalman filter applicable to GNSS","volume":"83","author":"Petovello","year":"2009","journal-title":"J. Geod."},{"key":"ref_50","doi-asserted-by":"crossref","first-page":"3671","DOI":"10.1109\/TAES.2012.6324756","article-title":"Characteristics of Kalman filters for GNSS signal tracking loop","volume":"48","author":"Won","year":"2012","journal-title":"IEEE Trans. Aerosp. Electron. Syst."},{"key":"ref_51","doi-asserted-by":"crossref","first-page":"25","DOI":"10.1002\/(SICI)1099-1247(199701)15:1<25::AID-SAT565>3.0.CO;2-F","article-title":"GNSS code and carrier tracking in the presence of multipath","volume":"15","author":"Brodin","year":"1997","journal-title":"Int. J. Satellite Commun."},{"key":"ref_52","doi-asserted-by":"crossref","first-page":"13","DOI":"10.1007\/s10291-016-0545-x","article-title":"Uncovering common misconceptions in GNSS Precise Point Positioning and its future prospect","volume":"21","author":"Choy","year":"2017","journal-title":"GPS Solut."},{"key":"ref_53","doi-asserted-by":"crossref","first-page":"360","DOI":"10.1080\/19475705.2014.917724","article-title":"Experimental assessment of post-processed kinematic Precise Point Positioning method for structural health monitoring","volume":"7","author":"Yigit","year":"2016","journal-title":"Geomat. Nat. Hazards Risk"},{"key":"ref_54","doi-asserted-by":"crossref","unstructured":"Realini, E., Caldera, S., Pertusini, L., and Sampietro, D. (2017). Precise Gnss Positioning Using Smart Devices. Sensors, 17.","DOI":"10.3390\/s17102434"},{"key":"ref_55","doi-asserted-by":"crossref","first-page":"K12","DOI":"10.1190\/1.1852780","article-title":"Full-resolution 3D GPR imaging","volume":"70","author":"Grasmueck","year":"2005","journal-title":"Geophysics"},{"key":"ref_56","doi-asserted-by":"crossref","first-page":"B11","DOI":"10.1190\/1.2825408","article-title":"Visualization of active faults using geometric attributes of 3D GPR data: An example from the Alpine Fault Zone, New Zealand","volume":"73","author":"McClymont","year":"2008","journal-title":"Geophysics"},{"key":"ref_57","doi-asserted-by":"crossref","first-page":"11","DOI":"10.3997\/1873-0604.2011016","article-title":"From pseudo-3D to full-resolution GPR imaging of a complex Roman site","volume":"10","author":"Novo","year":"2012","journal-title":"Near Surf. Geophys."},{"key":"ref_58","doi-asserted-by":"crossref","first-page":"2692","DOI":"10.1109\/TGRS.2010.2040747","article-title":"Modified Kirchhoff migration for UWB MIMO array-based radar imaging","volume":"48","author":"Zhuge","year":"2010","journal-title":"IEEE Trans. Geosci. Remote Sens."}],"container-title":["Remote Sensing"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2072-4292\/12\/8\/1300\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,13]],"date-time":"2025-10-13T13:21:33Z","timestamp":1760361693000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2072-4292\/12\/8\/1300"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2020,4,20]]},"references-count":58,"journal-issue":{"issue":"8","published-online":{"date-parts":[[2020,4]]}},"alternative-id":["rs12081300"],"URL":"https:\/\/doi.org\/10.3390\/rs12081300","relation":{},"ISSN":["2072-4292"],"issn-type":[{"value":"2072-4292","type":"electronic"}],"subject":[],"published":{"date-parts":[[2020,4,20]]}}}