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| 1 | A Synthesizing Land-cover Classification Method Based on Google Earth Engine: A Case Study in Nzhelele and Levhuvu Catchments, South Africa显示文摘This study designed an approach to derive land-cover in the South Africa with insufficient ground samples, and made a case demonstration in Nzhelele and Levhuvu catchments, South Africa. The method was developed based on an integration of Landsat 8, Sentinel-1, and Shuttle Radar Topography Mission(SRTM) Digital Elevation Model(DEM), and the Google Earth Engine(GEE) platform. Random forest classifier with 300 trees is employed as land-cover classification model. In order to overcome the defect of insufficient ground data, the stratified sampling method was used to generate the training and validation samples from the existing land-cover product. Likewise, in order to recognize different land-cover categories, the percentile and monthly median composites were employed to expand input metrics of random forest classifier. Results showed that the overall accuracy of the land-cover of Nzhelele and Levhuvu catchments, South Africa in 2017–2018 reached to 76.43%. Three important results can be drawn from our research. 1) The participation of Sentinel-1 data can slightly improve overall accuracy of land-cover while its contribution on land-cover classification varied with land types. 2) Under-fitting problem was observed in the training of non-dominant land-cover categories using the random sampling, the stratified sampling method is recommended to make sure the classification accuracy of non-dominant classes. 3) When related reflectance bands participated in the training process, individual Normalized Difference Vegetation index(NDVI), Enhanced Vegetation Index(EVI), Soil Adjusted Vegetation Index(SAVI), Normalized Difference Built-up Index(NDBI) have little effect on final land-cover classification result. | ZENG Hongwei WU Bingfang WANG Shuai MUSAKWA Walter TIAN Fuyou MASHIMBYE Zama Eric POONA Nitesh SYNDEY Mavengahama | 2020 | Chinese Geographical Science2020，30，3： | 4 |
| 2 | Biochemical attributes of tea flowers (Camellia sinensis)at different developmental stages in the Kangra region of India显示文摘 | ROBIN J POONA M ASHU G | 2011 | Scientia Horticulturaef2011，130，： | 1 |
| 3 | Efficacy and safety of the Ahmed glaucoma valve implent in Chinese eyes with complicated glaucoma显示文摘 | Lai JSM Poona ASY Chua JKH | 2000 | Br J Ophthalmol2000，84，7： | 1 |
| 4 | Chemokine receptors support infiltration of lymphocyte subpopulations in human hepatocellular carci- noma显示文摘 | Liu Y Poona R T Hughes J | 2005 | Clin Immund2005，114，2： | 1 |
| 5 | Emergence of a novel swine - origin influenza A virus ( S - OIV) H1N1 virus in humans 显示文摘 | J S Malik Peirisab Leo L M Poona Yi Guana | 2009 | Journal of clinical virology2009，45，3： | 1 |
| 6 | Chemokine receptors support infiltration of lymphocyte subpopulations in human hepatocellular carcinoma显示文摘 | Liua Y Poona R T Hughesb J | | 0，，： | 1 |
| 7 | Pozzolanic properties of reject fly ash in blended cement pastes显示文摘 | Poona C S Qiaoa X C Linb Z S | 2003 | Cement and Concrete Research2003，33，： | 1 |
| 8 | Efficacy and safety of the Ahmed glaucoma valve implant in Chinese eye with complicated glaucoma 显示文摘 | Lai JSM Poona ASY Chua JKH | 2000 | Br J Ophthalmol2000，84，7： | 1 |
| 9 | ATG5, autophagy and lung function in asthma显示文摘 | Poona A Eidelmana D Laprise C et aI | 2012 | Autophagy2012，8，4： | 1 |
| 10 | Emergence of a novel swine-origin influenza A virus (S-OFV) H1N1 virus in humans显示文摘 | Peiris M Leo J S Poona L M | 2009 | J Clin Virol2009，45，3： | 1 |
| 11 | NAA OF SOME ANCIENT INDIAN COINS显示文摘NAAOFSOMEANCIENTINDIANCOINSN.S.RajurkalandB.D.Fulsoundar(DepartmentofChemistry,UniversityofPoona,Pune-411007,India)Abstract:T... | N.S.Rajurkal and B.D.Fulsoundar(Department of Chemistry,University of Poona,Pune-411007,India) | 1995 | Nuclear Science and Techniques1995，6，2： | 0 |
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