Evaluation Of Urban Green Space Landscape Layout Based On GIS

Under the background of rapid urban development in China,the impact of reasonable green space layout on the healthy development of cities has gradually attracted people's attention.The traditional urban construction mode has broken the equilibrium between urban development and natural ecological processes.So we put forward the ecological service equalization and source sink theory to rational distribution of green landscape of the ideas of this paper,research and analysis of green space in Tianjin city facing the green building is not uniform,the city water erosion problems caused by the irrational distribution.The rational evaluation of the distribution pattern of green space in Tianjin is made from two aspects of the level of ecological service equalization and the degree of water loss.In order to improve the effect of greening on the evaluation of city green objective level of ecological service equallization.ecological service quantity in this paper to measure the amount of green ecological city green space provided by using GIS as the analytical tool,using the distance attenuation and source superposition of two calculation models.calculate the amount received by a single green plaque the disribution of the visual system;show the ecological green quantity received the plaque in space;the west block of Tianjin Binhai New Area as the study arca,calculted the block point and the received amount of ecosystem services,so as to evaluate the ecological service equalization.The results showed that:from the overall level,the effcct of ecological greening in the study area was good,most of the patches reached the standard.Only four patches in the southwestern part of thc study area did not reach the standard value.However,from the point of view of equalization of ecosystem services.the spatial distribution of the amount of ecological green received by patches is nout uniform.Applying,this method,we can find oout the arcas where the urban green space ceosystem service capacity is weak,and have some reference value for the planning of urban green space system.In addition.in order to further improve the effect of greening in the study area,to improve the reasonable layout of green water loss from the control point of view,analyze the relationship between the city landscape spatial pattern and ecological processes of water erosion,and make reasonable evaluation to the effect of landscape pattern.This paper combines the natural geographical environment of Tianjin,analyzes the main reasons causing a large area of water shortage in Tianjin,and the water loss of the ecological process as the research object,the landscape contrast index application source "theory to this study,and the weight formula for calculation of the load index between landscape space.The use of remote sensing and GIS tools to calculate the contrast index of landscape spatial load of each block,and evaluate the landscape pattern of the index to three blocks,so that each block of the landscape pattern on rational distribution of water loss and the main cause of water loss,put forward suitable for each block of the main problems and suggestions for each block.Generally speaking,the distribution of landscape pattern in Tianjin is unreasonable,and the main problems in each block are also different.