Research Of The Responses Between Urban Spatial Structure And The Remote Sensing Surface Energy

Remote sensing based land surface energy information documents the ecological process of regional ecosystem elements.The distribution and variation trends of land surface energy reflect regional ecosystem element’s structure and quality.This study based on the theory of urban ecology,focusing on Sanya’s city and center built-up area,provides a scientific basis of urban planning and urban design in decision-making,prediction,implementation,verification and so on.In the first part,information about land surface energy and vegetation greenness in Sanya are extracted as classes of land surface energy,vegetation greenness and vegetation-energy relationship index.Vertical and horizontal distributions of urban ecology in Sanya of 30 years(1988-2015)are used to discuss the spatial-temporal zonality changes.In the second part,the study analyzes the responses between urban spatial structure and land surface energy in center built-up area based on the grid cell,and between road network structure and land surface energy combined with the space syntax.The following results are noted:In research method:(1),Analyzing city’s vegetation environment with vegetation-energy index is better than using vegetation or energy index alone.(2)The density analysis method diagnoses tendency,numerical range and structure of vegetation-energy in a two-dimensional space.(3)Using land surface energy classification in grid cell,small volume element types are identified in surface energy distribution map.(4)Relationship between road attributes,road network distribution and urban surface energy associated with quantitative analysis of urban spatial structure based on space syntax and its extended parameters is the supplement of remote sensing method.In city ecological evaluation:(5)Spatially the low vegetation greenness and high land surface energy shifts to high vegetation greenness and low land surface energy from coastal area to mountain area.The vegetation greenness and land surface energy have increased,vegetation in higher elevation has a high increased trend in vegetation greenness and a low increased trend in land surface energy.(6)In the plantation area below 200 meters height,the ecological quality declined the most.The stability of spatial and temporal distribution of natural forest in land surface energy and vegetation greenness is higher than plantations above 400 meters.In the three plantations,the ecological quality of the rubber plantation was the best,followed by the eucalyptus forest,and the fruit forest.In center built-up area:(7)Frequency and intensity of human disturbance affect the intensity of surface energy.Open field covered with natural vegetation has a more stable energy state than it with plantations and urban green space,or urban physical field and open urban space networks.(8)In urban elements,urban physical field and urban open field’s type,state and diversity level have relation with land surface energy.(9)In group combination,urban physical field and urban open field’s distribution and scale influence the distribution of urban land surface energy.(10)Combine the analysis of spatial syntax and its extension parameters with the analysis of urban spatial structure,two aspects are noted as follows: First,the attributes of the road and its surrounding environment impact surface energy distribution.Second,through the impact of the city’s segmentation and the internal movement of the city,the road network impact the urban spatial structure and surface energy distribution.