[1] D X CHEN, M B COUGHENOUR. GEMTM： A general model for energy and mass transfer of land surfaces and its application at the FIFE sites. Agricultural and Forest Meteorology, 68, 145-171(1994).

[2] X LI, A H STRAHLER, C E WOODCOCK. A hybrid geometric optical-radiative transfer approach for modeling albedo and directional reflectance of discontinuous canopies. IEEE Transactions on Geoscience and Remote Sensing, 33, 466-480(1995).

[3] W NI, X LI, C E WOODCOCK et al. Transmission of solar radiation in boreal conifer forests： Measurements and models. Journal of Geophysical Research Atmospheres, 102, 29555-29566(1997).

[4] C SONG, L E BAND. MVP： a model to simulate the spatial patterns of photosynthetically active radiation under discrete forest canopies. Canadian Journal of Forest Research, 34, 1192-1203(2004).

[5] Xiahui ZENG, Ying WANG, Zhangquan ZENG et al. Research on extraction of tree crown information from UAV images. Journal of Central South University of Forestry and Technology, 40, 75-82(2020).

[6] Ningshan WU, Jiaxi WANG, Yan ZHANG et al. Determining tree species and crown width from unmanned aerial vehicle imagery in hilly loess region of west Shanxi，China： A case study from Caijiachuan watershed. Acta Agriculturae Zhejiangensis, 33, 1505-1518(2021).

[7] Jianli LIU, Xiaohan LIAO, Wenjian NI et al. Individual tree recognition algorithm of UAV stereo imagery considering Three-dimensional morphology of tree. Journal of Geo-information Science, 23, 1861-1872(2021).

[8] R A FOURNIER, G EDWARDS, N R ELDRIDGE. A catalogue of potential spatial discriminators for high spatial resolution digital images of individual crowns. Canadian Journal of Remote Sensing, 21, 285-298(1995).

[9] F A GOUGEON. Comparison of possible multispectral classification schemes for tree crowns individually delineated on high spatial resolution MEIS images. Canadian Journal of Remote Sensing, 21, 1-9(1995).

[10] G P ASNER, S ARCHER, R F HUGHES et al. Net changes in regional woody vegetation cover and carbon storage in Texas Drylands， 1937-1999. Global change biology, 9, 316-335(2003).

[11] M A WULDER, J C WHITE, K O NIEMANN et al. Comparison of airborne and satellite high spatial resolution data for the identification of individual trees with local maxima filtering. International Journal of Remote Sensing, 25, 2225-2232(2004).

[12] M J FALKOWSKI, A M S SMITH, A T HUDAK et al. Automated estimation of individual conifer tree height and crown diameter via two-dimensional spatial wavelet analysis of lidar data. Canadian Journal of Remote Sensing, 32, 153-161(2006).

[13] E K STRAND, A M S SMITH, S C BUNTING et al. Wavelet estimation of plant spatial patterns in multitemporal aerial photography. International Journal of Remote Sensing, 27, 2049-2054(2006).

[14] S C POPESCU. Estimating biomass of individual pine trees using airborne lidar. Biomass and Bioenergy, 31, 646-655(2007).

[15] S CROMMELINCK, R BENNETT, M GERKE et al. Review of automatic feature extraction from high-resolution optical sensor data for UAV-based cadastral mapping. Remote Sensing, 8, 689(2016).

[16] K KANEKO, S NOHARA. Review of effective vegetation mapping using the UAV（Unmanned Aerial Vehicle） method. Journal of Geographic Information System, 6, 733-742(2014).

[17] A ADHIKARI, M KUMAR, S AGRAWAL et al. An integrated object and machine learning approach for tree canopy extraction from UAV datasets. Journal of the Indian Society of Remote Sensing, 49, 471-478(2021).

[18] Guodong YANG, Minshui WANG. The tilt photographic measuration technique and expectation. Geomatics & Spatial Information Technology, 39, 13-18(2016).

[19] T L SWETNAM, D A FALK. Application of metabolic scaling theory to reduce error in local maxima tree segmentation from Aerial LiDAR. Forest Ecology and Management, 323, 158-167(2014).

[20] Jianli LIU, Zhiyu ZHANG, Wenjian NI et al. Individual tree recognition algorithm based on unmanned Aerial vehicle image matching point cloud. Remote Sensing Information, 34, 93-101(2019).

[21] Wenxiu TENG, Ni WANG, Huihui SHI et al. Tree species classification of high resolution image combining with object-oriented and deep feature. Bulletin of Surveying and Mapping, 38-42(2019).

[22] Zhenfeng SUN, Xiaoli ZHANG, Niwen LI. Comparison of individual tree crown extraction method and suitability of airborne and spaceborne high-resolution remote sensing images. Journal of Beijing Forestry University, 41, 66-75(2019).

[23] Zhen ZHEN, Xiang LI, Siyu XIU et al. Individual tree crown delineation using maker-controlled region growing method. Journal of Northeast Forestry University, 44, 22-29(2016).

[24] Renrong JIANG, Chunyan WANG, Liqiang SHEN et al. A method for Lichee’s tree-crown information extraction based on high spatial resolution image. Transactions of the Chinese Society for Agricultural Machinery, 47, 17-22(2016).

[25] J YANG, Y HE, J P CASPERSEN et al. Delineating individual tree crowns in an uneven-aged， mixed broadleaf forest using multispectral watershed segmentation and multiscale fitting. IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 10, 1390-1401(2017).

[26] Huihui SHI, Ni WANG, Wenxiu TENG et al. Tree canopy extraction method of high resolution image based on Gabor filter and Morphology. Journal of Geo-information Science, 21, 249-258(2019).

[27] Minghua LI, Yuzhu CHEN, Shufang ZHOU et al. Extraction and recognition of individual tree information on aerial image data used Watershed Algorithm. Journal of Northeast Forestry University, 47, 58-70(2019).

[28] Xuzhai YU, Ruirui WANG, Weijie CHEN. Forest canopy segmentation of UAV remote sensing images using improved Watershed Algorithm. Journal of Fujian Agriculture and Forestry University （Natural Science Edition）, 47, 428-434(2018).

[29] Yanfei ZHOU, Huifang ZHANG, Xia LI et al. Extraction of tree-crown of Populus Euphratica and Tamarix Ramosissima based on high resolution remote sensing data. Remote Sensing Technology and Application, 30, 510-517(2015).

[30] Yapei WANG, Zhenxi WANG. tianshanica based on UAV images. Journal of Central South University of Forestry & Technology, 40, 57-66(2020).

[31] Liqiang SHEN, Renrong JIANG, Peifa WANG. A method for individual tree-crown extraction from high spatial resolution imagery. Remote Sensing Information, 32, 142-148(2017).

[32] W LI, Z NIU, H CHEN et al. Remote estimation of canopy height and aboveground biomass of maize using high-resolution stereo images from a low-cost unmanned aerial vehicle system. Ecological Indicators, 67, 637-648(2016).

[33] Zengyuan LI, Qingwang LIU, Yong PANG. Review on forest parameters inversion using LiDAR. Journal of Remote Sensing, 20, 1138-1150(2016).

[34] Yi HE, Xiaocheng ZHOU, Hongyu HUANG et al. Counting tree number in subtropical forest districts based on UAV remote sensing imagery. Remote Sensing Technology and Application, 33, 168-176(2018).

[35] Q CHEN, D BALDOCCHI, P GONG et al. Isolating individual trees in a savanna woodland using small footprint lidar data. Photogrammetric Engineering & Remote Sensing： Journal of the American Society of Photogrammetry, 72, 923-932(2006).

[36] Xinyun WANG, Yang HUANG, Yanqiu XING et al. The single tree segmentation of UAV high-density LiDAR point cloud data based on coniferous plantations. Journal of Central South University of Forestry & Technology, 42, 66-77(2022).

[37] Yihong DU, Tian YIN, Xuemei ZHOU et al. Extraction of individual tree parameters of Chinese pine by oblique photogrammetry. Journal of Beijing Forestry University, 43, 77-86(2021).

[38] Ya LUO, Jianhua XU, Wenze YUE et al. A comparative study of extracting urban vegetation information by vegetation indices from thematic mapper images. Remote Sensing Technology and Application, 21, 212-219(2006).

[39] Zhihui MAO, Lei DENG, Ying HE et al. Vegetation index for visible-light true-color image using hue and lightness color channels. Journal of Image and Graphics, 22, 1602-1610(2017).

[40] A A GITELSON, Y J KAUFMAN, R STARK et al. Novel algorithms for remote estimation of vegetation fraction. Remote Sensing of Environment, 80, 76-87(2002).

[41] D M WOEBBECKE, G E MEYER, K VON BARGEN et al. Color indices for weed identification under various soil， residue， and lighting conditions. Transactions of the ASAE, 38, 259-269(1995).

[42] G E MEYER, T W HINDMAN, K LAKSMI. Machine vision detection parameters for plant species identification, 3543, 327-335(1999).

[43] G E MEYER, C N JOAO. Verification of color vegetation indices for automated crop imaging applications. Computers and Electronics in Agriculture, 63, 282-293(2008).

[44] Mingyue YUAN, Guanyu CHEN. Study on improved algorithm of median filtering based on grey correlation. Geomatics & Spatial Information Technology, 43, 124-130(2020).

[45] Dajin HE, Ke XU. Change survey methods based on incremental database. Bulletin of Surveying and Mapping, 2012, 37-53.

[46] Jian ZENG, Xiaoli ZHANG, Xuemei ZHOU et al. Extraction of topographic information of larch plantation by oblique photogrammetry. Journal of Beijing Forestry University, 41, 1-12(2019).