• Regional mapping of forest biomass using SAR, lidar and photogrammetry data;

• Assessments and modeling of forest carbon cycle.

• Polarimetric SAR information extraction;

• Modeling of Radar backscattering over vegetated areas.

• University of Chinese Academy of Sciences,  China   (09/2004 -07/2009)

       Ph.D degree on July 1^st 2009 in Cartography and Geographical information system

• Shandong University of Technology,  China    (09/2000 - 07/2004)

        B.S degree in Surveying and Mapping

• Institute of Remote Sensing applications, Chinese Academy of Sciences 

          Assistant Research Scientist, 2009.7-2010.6

•  Department of Geographical Sciences, University of Maryland, college park

          Research Associate, 07/2010- 07/2014

• Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences

         Professor , 08/2014- 02/2020

• Aerospace Information Research Institute,Chinese Academy of Sciences

        Professor , 03/2020- Current

• Ruiqi Zhao, Wenjian Ni*, Zhiyu Zhang, Huabing Dai, Chengling Yang, Zhen Li, Yao Liang, Qingwang Liu, Yong Pang, Zengyuan Li, Guoqing Sun,(2023),Optimizing ground photons for canopy height extraction from ICESat-2 data in mountainous dense forests, Remote Sensing of Environment 299:113851
• L Du, Y Pang, W Ni, X Liang, Z Li, J Suarez, W Wei,(2023),Forest terrain and canopy height estimation using stereo images and spaceborne LiDAR data from GF-7 satellite,Geo-spatial Information Science, 1-11
• J Zang, W Ni*, Y Zhang*,(2023),Spatially-explicit mapping annual oil palm heights in peninsular Malaysia combining ICESat-2 and stand age data,Remote Sensing of Environment 295, 113693
• T Yu, W Ni*, J Liu, R Zhao, Z Zhang, G Sun,(2023), Extraction of tree heights in mountainous natural forests from UAV leaf-on stereoscopic imagery based on approximation of ground surfaces,Remote Sensing of Environment 293, 113613
• W Ni, T Yu, Y Pang, Z Zhang, Y He, Z Li, G Sun, (2023)， Seasonal effects on aboveground biomass estimation in mountainous deciduous forests using ZY-3 stereoscopic imagery, Remote Sensing of Environment 289, 113520
• Tianyu Yu, Wenjian Ni*, Zhiyu Zhang, Qinhuo Liu, Guoqing Sun, "Regional Sampling of Forest Canopy Covers Using UAV Visible Stereoscopic Imagery for Assessment of Satellite-Based Products in Northeast China", Journal of Remote Sensing, vol. 2022, Article ID 9806802. https://doi.org/10.34133/2022/9806802
• Huang, W., Min, W., Ding, J., et al. (2022). Forest height mapping using inventory and multi-source satellite data over Hunan Province in southern China. Forest Ecosystems, 9, 100006
• Wenjian Ni , Zhiyu Zhang and Guoqing Sun,2021,  Assessment of Slope-Adaptive Metrics of GEDI Waveforms for Estimations of Forest Aboveground Biomass over Mountainous Areas, Journal of Remote Sensing,Volume 2021, Article ID 9805364
• LIU Jianli, LIAO Xiaohan, NI Wenjian, WANG Yong, YE Huping, YUE Huanyin. Individual Tree Recognition Algorithm of UAV Stereo Imagery Considering Three-dimensional Morphology of Tree[J]. Journal of Geo-information Science, 2021, 23(10): 1861-1872.DOI:10.12082/dqxxkx.2021.210117

• Dong J C，Ni W J，Zhang Z Y and Sun G Q. 2021. Performance of ICESat-2 ATL08 product on the estimation of forest height by referencing to small footprint LiDAR data. National Remote Sensing Bulletin，25（6）：1294-1307

• Yu T Y，Ni W J，Liu J L and Zhang Z Y. 2021. Detection of scattered dead standing trees based on UAV visible images acquired in the Daxinganling Forest. National Remote Sensing Bulletin,25（3）:725-736

• Yu, Haoyang; Ni, Wenjian; Zhang, Zhongjun; Sun, Guoqing; Zhang, Zhiyu. 2020. "Regional Forest Mapping over Mountainous Areas in Northeast China Using Newly Identified Critical Temporal Features of Sentinel-1 Backscattering" Remote Sens. 12, no. 9: 1485. https://doi.org/10.3390/rs12091485
• Wang, Y., Ni, W.J.*, Sun, G.Q., Chi, H., Zhang, Z.Y., & Guo, Z.F. (2019).Slope-adaptive waveform metrics of large footprint lidar for estimation of forest aboveground biomass, Remote Sensing of Environment, 224, 386-400
• Xiao, J.F., Chevallier, F., Gomez, C., Guanter, L., Hicke, J.A., Huete, A.R., Ichii, K., Ni, W.J., Pang, Y., Rahman, A.F., Sun, G.Q., Yuan, W.P., Zhang, L., & Zhang, X.Y. (2019). Remote sensing of the terrestrial carbon cycle: A review of advances over 50 years. Remote Sensing of Environment, 233
• Ni, W.J., Dong, J.C., Sun, G.Q., Zhang, Z.Y., Pang, Y., Tian, X., Li, Z.Y., & Chen, E.X. (2019). Synthesis of Leaf-on and Leaf-off Unmanned Aerial Vehicle (UAV) Stereo Imagery for the Inventory of Aboveground Biomass of Deciduous Forests. Remote Sensing, 11
• Ni, W.J., Zhang, Z.Y., Sun, G.Q., & Liu, Q.H. (2019). Modeling the Stereoscopic Features of Mountainous Forest Landscapes for the Extraction of Forest Heights from Stereo Imagery. Remote Sensing, 11
• Zhang, D.F., Liu, J.L., Ni, W.J.*, Sun, G.Q., Zhang, Z.Y., Liu, Q.H., & Wang, Q. (2019). Estimation of Forest Leaf Area Index Using Height and Canopy Cover Information Extracted From Unmanned Aerial Vehicle Stereo Imagery. Ieee Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 12, 471-481
• W. Ni, G. Sun, Y. Pang, Z. Zhang, J. Liu, A. Yang, et al. , 2018, "Mapping Three-Dimensional Structures of Forest Canopy Using UAV Stereo Imagery: Evaluating Impacts of Forward Overlaps and Image Resolutions With LiDAR Data as Reference," IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, vol. 11, pp. 3578-3589.
• W. Ni, Z. Zhang, G. Sun, and Q. Liu, "Modeling Interferometric SAR Features of Forest Canopies Over Mountainous Area at Landscape Scales," IEEE Transactions on Geoscience and Remote Sensing, 2018. DOI:10.1109/TGRS.2017. 2787704， vol. 56, pp. 2958-2967.
• H. G. Huang, Z. Y. Zhang, W. J. Ni, L. N. Chai, W. H. Qin, G. Liu, et al.  2018, "Extending RAPID model to simulate forest microwave backscattering," Remote Sensing of Environment, vol. 217, pp. 272-291.
• Z. Q. Yang, J. W. Dong, Y. W. Qin, W. J. Ni, G. S. Zhao, W. Chen, et al., 2018, "Integrated Analyses of PALSAR and Landsat Imagery Reveal More Agroforests in a Typical Agricultural Production Region, North China Plain," Remote Sensing, vol. 10(9).
• H. Yu, W. Ni, Z. Zhang, Z. Zhang, and G. Sun, 2018. "Extraction of digital elevation model from Chinese GF-3 C-band synthetic aperture radar data with a step-wise method focusing on facilitating phase unwrapping," J. Appl. Remote Sens. 12(3), 035004
• Y. F. Bao, W. J. Ni, D. Z. Wang, C. Y. Yue, H. Y. He, and H. Verbeeck, 2018, "Effects of Tree Trunks on Estimation of Clumping Index and LAI from HemiView and Terrestrial LiDAR," Forests, vol. 9(3):144.
• Wei Guo, Guiying Li, Wenjian Ni, Yuhuan Zhang & Dengsheng Lu, Exploring improvement of impervious surface estimation at national scale through integration of nighttime light and Proba-V data, 2018, GIScience & Remote Sensing , DOI:10.1080/15481603.2018.1436425 (https://www. tandfonline .com /doi/full/10.1080/15481603.2018.1436425), vol. 55, pp. 699-717.
• Z. Y. Zhang, W. J. Ni*, G. Q. Sun, W. L. Huang, K. J. Ranson, B. D. Cook, et al., "Biomass retrieval from L-band polarimetric UAVSAR backscatter and PRISM stereo imagery," Remote Sensing of Environment, vol. 194, pp. 331-346, Jun 1 2017.   
• Y. Zhang, Q. H. Liu, L. F. Tan, H. G. Huang, W. J. Ni, T. G. Yin, et al., "A 3-D Joint Simulation Platform for Multiband Remote Sensing," IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, vol. 10, pp. 4763-4778, Nov 2017.
• H. Chi, G. Q. Sun, J. L. Huang, R. D. Li, X. Y. Ren, W. J. Ni, et al., "Estimation of Forest Aboveground Biomass in Changbai Mountain Region Using ICESat/GLAS and Landsat/TM Data," Remote Sensing, vol. 9, Jul 2017.
• Wenli Huang, Guoqing Sun, Wenjian Ni, Zhiyu Zhang, and Ralph Dubayah, 2015, “Sensitivity of Multi-Source SAR Backscatter to Changes in Forest Aboveground Biomass”. Remote Sensing, 7(8): p. 9587-9609.
• Hongchi, Guoqing Sun, Jinliang Huang, Zhifeng Guo, Wenjian Ni, and AnMin Fu, 2015, “National Forest Aboveground      Biomass Mapping from ICESat/GLAS Data and MODIS Imagery in China”. Remote Sensing, 7(5): p. 5534-5564.
• Wenjian Ni, Guoqing Sun, Kenneth Jon Ranson, Yong Pang, Zhiyu Zhang, Wei Yao, 2015, "Extraction of ground surface elevation from ZY-3 winter stereo imagery over deciduous forested areas", Remote Sensing of Environment, 159：194-202
• Wenjian Ni，Guoqing Sun，Kenneth J. Ranson, 2015, "Characterization of ASTER GDEM Elevation Data over vegetated Area Compared with Lidar Data", International Journal of Digital Earth, 8(3):198-211
• Wenjian Ni, Kenneth Jon Ranson, Zhiyu Zhang, Guoqing Sun, 2014, "Features of Point Clouds Synthesized from Multi-view ALOS/PRISM Data and Comparisons with LiDAR Data in Forested Areas", Remote Sensing of Environment, 149:47-57
• Wenjian Ni, Zhiyu Zhang, Guoqing Sun, Zhifeng Guo, Yating He, 2014, "The Penetration Depth Derived from the Synthesis of ALOS/PALSAR InSAR Data and ASTER GDEM for the Mapping of Forest Biomass", Remote Sensing, 6(8):7303-7319
• Wenjian Ni，Guoqing Sun，Kenneth J. Ranson, Zhiyu Zhang, Wenli Huang, Zhifeng Guo, 2014, "Model based analysis of the influence of forest structures on the scattering phase center at L-band", IEEE Transactions on Geoscience and Remote Sensing, 52(7):3937-3946
• Wenjian Ni，Guoqing Sun, Zhiyu Zhang, Yating He, Zhifeng Guo. 2014, "A Heuristic Approach to Reduce Atmospheric Effects in InSAR Data for the Derivation of Digital Terrain Models or for the Characterization of Forest Vertical Structure". IEEE Geosciences and Remote Sensing Letter, 11(1): 268-272;
• Wenjian Ni，Guoqing Sun, Zhiyu Zhang, Yating He,. 2014, "Co-registration of two DEMs: impacts on forest height estimation from SRTM and NED at mountainous areas". IEEE Geosciences and Remote Sensing Letter. 11(1): 273 – 277
• W. Ni, G. Sun, Z. Guo, Z. Zhang, Y. He, and W. Huang,2013, "Retrieval of Forest Biomass From ALOS PALSAR Data Using a Lookup Table Method", IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing. V6(2)875-886
• Huang, W., Sun, G., Dubayah, D., Cook, B., Montesano, P., Ni, W., Zhang, Z., 2013. Mapping biomass change after forest disturbance: Applying LiDAR footprint-derived models at key map scales, Remote Sensing of Environment, 134:319-332.
• He, Q. S., Cao, C. X., Chen, E. X., Sun, G. Q., Ling, F. L., Pang, Y., Zhang, H., Ni, W. J., Xu, M., Li, Z. Y., Li, X. W., Forest stand biomass estimation using ALOS PALSAR data based on LiDAR-derived prior knowledge in the Qilian Mountain, western China. International Journal of Remote Sensing, 2012. 33(3): p. 710-729.
• Shi Jiancheng, Du yang, Du Jinyang, Jiang Lingmei, Chai Linna, Mao Kebiao, Xu Peng, Ni Wenjian, Xiong Chuan, Liu Qiang, Liu Chenzhou, Guo Peng, Cui Qian, LI Yunqing, Chen Jing, Wang Anqi, Luo Hejia, Wang Yinhui, 2012. “Progresses on microwave remote sensing of land surface parameters”, SCIENCE CHINA Earth Sciences, 55(7): 1052-1078
•  W. Ni，Z. Guo，G. Sun，H. Huang. 2011. "A method for the registration of multiview range images acquired in forest areas using a terrestrial laser scanner", International Journal of Remote Sensing, vol. 32, issue 24, pp. 9769-9787.
• Huabing Huang, Zhan Li, Peng Gong, Xiao Cheng, Nick Clinton, Chunxiang Cao, Wenjian Ni, Lei Wang, 2011, Automated methods for measuring DBH and tree heights with a commercial scanning LiDAR. Photogrammetric Engineering & Remote Sensing, 77(3), pp.219–227.
• W. Ni, Z. Guo, G. Sun, 2010, "Improvement of a 3D radar backscattering model using matrix-doubling method", SCIENCE CHINA Earth Sciences, V53(7)1029-1035.

Sampling dataset of canopy cover across Daxing'anling forests in 2018