Research on alternating projection algorithm in evaluation of urban space quality

Quality of urban space needs assessment to establish evaluation index system, and then summarize and evaluate the indicator. Based on the assessment of urban spatial quality of the actual situation, the article established the urban space quality evaluation system for quality assessment of urban space. This article also discussed the issue of a special aggregate index, and its practical significance is not in advance, but the summary coefficient calculated based on the sample. In this paper, the interaction between convex projection methods gives the least squares estimation model, using EM algorithm gives the maximum likelihood estimation, thus the quality of evaluation index system of urban space provides a new analysis method.