Study On General Land-use Planning Of The County Based On GIS Technology

On the background of population, resource and environment sustainable developing, how to allocate the limited resources proportionally to meet the needs of society, economy and ecology benefit is a puzzle, which needs to arrange land resource reasonably. The general land-use planning is the useful and rational way of land resource arrangement. With the development of Chinese society and economy, how to optimize land-use structure and layout to increase efficiency of land utilization has become one of most difficulty problems for China.In this paper, we focused on the need of the general land-use planning of county and a new GIS technology-mathematic model mixed method was explored to promote the scientific planning. A method, which is adaptive to China, was studied, and various results of general land-use planning of county were generated. The results can be outlined as follows:1.Land-use planning is a long-term and comprehensive work, which suggests that the land data includes not only a large number of space-time data, but also mass data from different industries, therefore, the storage format of the data is different and historical data is disperse. In this paper, a basic data base was designed to service the land-use planning. A mutual operating method was complied to complete the data direct access, which means there is no need to finish format conversion with specific data conversion software. The mutual operating method guarantee the accuracy, integrity and edit capability of the source data, which simplifies the complex problem and makes it easy to operate. The mutual operating method realizes the centralized management of the source data and the general land-use planning data was preliminarily built.2. In the previous study of existing condition analysis of land-use, for the GIS's constraints, more investigations focused on how to analysis the change of quantity and index in a short time with statistical analysis, which can't describe the space change sufficiently. In this paper, process longitudinal comparison method, in conjunction with GIS technology, was used to explain the temporal and spatial variation of land-use. This can be accomplished as follows:firstly, the delineations of land-use were stacked with GIS, then, the area of the delineations was computed and adjusted with the same algorithm. As long as the changed area reaches the criterion area, the delineation will show, and we can look up the land types and areas from the attribute data in different times. The verifying source data was processed with the method and the results indicate that the variations of the land-use are more fitting to the reality.3.1n this paper, we assessed the land suitability in different land-uses with GIS technology, mainly in the agricultural land and building site.On the basis of previous research, a new method was put forward to create evaluation unit. Overlay method, combing with dynamic grid method, were applied to form new unit as follows:firstly, the source data was processed into preliminary evaluation unit with overlay method, and then the Delphi method was used to determine the weight factor of every unit, at the same time, the standardized score of the unit was also calculated. After that, the final evaluation unit was created with dynamic grid method.In this way, the advantage of the two methods was utilized sufficiently and the disadvantage was avoided. The new evaluation unit, created by the two methods, kept the existing condition of the land-use and actuality of the data, and normalized the evaluation unit to suit the allocation of the land-use layout optimization. In this way, the basic farm land conservation of Wenquan county was outlined and the restrictive partition of building site was created.4.According to previous researches, we put forward a grey multiple objective programming structure optimization method, which was embeded with elastic programming, we believe the method is applicable in Xinjiang.In the building process, the objective of structure optimization must be set firstly, and then the relation between influence, which is the result of human's activities on land use types, and three objectives should be computed; after that, the national standard land use types are merged, and the decision variables for the structure optimization are produced.In this paper, we built multiple constraint condition according to the character of water and soil resource in Wenquan county, and WinQSB was used to form three land-use structure optimization schemes. Mass Balance Theory, and relative theories about ecology and environment were tentatively used to qualitative analyze the advantages and disadvantages of the three schemes, the objective of which is to complete how to choose the best plan in the process of land-use structure optimization.5. According to the agricultural land suitability assess of Wenquan county, the basic agricultural land conservation of Wenquan county was outlined. In the process, fertile farmland was classified as basic agricultural land conservation and the total unit score arranged in descending order. When the basic agricultural land are needed to be divided as alternative land, the same principle should be followed.6.In this paper, a new regular land layout method based on GIS technology was put forward. The method built regular map on the basis of building suitability, location, point-axis theory, development constraints and land conversion rule. Multiple rules were built to realize the optimization of the land-use layout.The method realized the unifactor ruled map one by one, based on which, the overall objective ruled map was produced.In the process of the optimization of the land-use layout, the partition of allowable building zone, conditional building zone and forbidden building zone was finished on the overall objective ruled map, thus, the control partition of land-use layout building zone formed. Different land-use layout and building zone control partition were set according to the specific prior development and constrained development policy.In this paper, the method is illustrated by an example of Wenquan county, Xinjiang Uygur Autonomous Region. In the process, the normalized land layout method based on GIS was used to explore the land-use layout of Wenquan county, and the details of the method was demonstrated, in addition, the scientific feature, practical feature and operating feature were discussed.