Some articles on the High Accuracy Surface Modelling (HASM) based on the Surface Theory 岳天祥,杜正平,宋敦江.高精度曲面建模(HASM4) ,中国图象图形学报,2006, 12(2): 343-348 Tian-Xiang Yue, Zheng-Ping Du, Dun-Jiang Song, Yun Gong. 2007. A new method of surface modeling and its application to DEM construction. Geomorphology 91(1-2): 161-172. W.J. Shi, J.Y. Liu, Z.P. Du, Y.J. Song , C.F. Chen, and T.X. Yue, Surface modeling of soil pH. Geoderma, 2009, 150(1-2), pp. 113-119. Tian-Xiang Yue, Dun-Jiang Song, Zheng-Ping Du, Wei Wang. 2010. High-accuracy surface modelling and its application to DEM generation. International Journal of Remote Sensing 31(8): 2205-2226. Tian-Xiang Yue, Shi-Hai Wang. 2010. Adjustment computation of HASM: a high-accuracy and high-speed method. International Journal of Geographical Information Science 24(11): 1725 - 1743. Tian-Xiang Yue, Chuan-Fa Chen, Bai-Lian Li. 2010. An adaptive method of high accuracy surface modeling and its application to simulating elevation surfaces. Transactions in GIS 14(5): 615-630. Chen, C.F., Yue, T.X.: A method of DEM construction and related error analysis. Comput. Geosci. 36, 717-725 (2010) Tian-Xiang Yue. 2011. Surface Modelling: High Accuracy and High Speed Methods. New York: CRC Press (Taylor Francis group). Tian-Xiang Yue , Chuan-FA Chen Bai-Lian Li (2012): A high-accuracy method for filling voids and its verification, International Journal of Remote Sensing, 33:9, 2815-2830 Chen, C.F., Yue, T.X., Li, Y.Y.: A high speed method of SMTS. Comput. Geosci. 41, 64-71(2012) Chen, Chuan-Fa, Yue, Tian-Xiang, Dai, Hong-Lei, Tian, Mao-Yi. 2013. The moothness of HASM. International Journal of Geographical Information Science 27(8), 1651–1667 Chen, Chuan-Fa, Yanyan Li, Tianxiang Yue. 2013. Surface modeling of DEMs based on a sequential adjustment method. International Journal of Geographical Information Science 27(7), 1272–1291 Na Zhao, Tianxiang Yue, Mingwei Zhao, An improved version of a high accuracy surface modeling method ,GEM - International Journal on Geomathematics, DOI 10.1007/s13137-013-0051-z,2013(in press) Shengxiang Tang Daijun Jiang , Applicable Analysis (2013): Two efficient algorithms for surface construction, Applicable Analysis: An International Journal, DOI:10.1080/00036811.2013.781157 Yue, T.-X., Zhao, N., Yang, H., Song, Y.-J., Du, Z.-P., Fan, Z.-M. and Song, D.-J. (2013), A Multi-Grid Method of High Accuracy Surface Modeling and Its Validation. Transactions in GIS. doi: 10.1111/tgis.12019 Christopher D. Lloyd (2013) Surface modeling: high accuracy and high speed methods, by Tian-Xiang Yue, International Journal of Geographical Information Science, 27:8, 1689-1690, DOI:10.1080/13658816.2013.790974 related topic: 1)It's meaningless to count the computation time of an iterative method while the initial values is not mentioned, for in an iterative method, from different initial values to the almost same results, time cost is different. 2)I t is irrational to say computation time of that method is very short, if the iterative method is dependent on some other conditon, such as boundary values. 3) It is wrong to say that an iterative method results is better than the other method without mentioning the other specific method, if the a method's results is heavily affected by its boundary values.