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Study of Land Suitability Evaluation Systems Base on GIS

Author: WangHongLi
Tutor: LiZhiHong
School: Jilin Agricultural University
Course: Soil
Keywords: GIS Land Suitability Evaluation ArcGIS Engine
CLC: P208
Type: Master's thesis
Year: 2008
Downloads: 701
Quote: 6
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Abstract


The Land Suitability is the suitability of certain types of land for a designated purposes. Land suitability classification process is in accordance with the suitability for a particular purpose, specific areas of land evaluation and classified. Geographic Information System (GIS) is a cross emerging discipline of geoscience and computer science, geographic information system (GIS) is used in agriculture, land evaluation, decision-making and the scientific basis for the reasonable use of the land, the needs of the development of modern agriculture . In recent years, GIS is more and more widely used in land resource evaluation of them. Also been some land suitability evaluation system of the application of GIS technology, these systems use GIS software to display the spatial data and analytical calculations, and the evaluation and geographic information systems integrated into a unified whole. In other words, the existing evaluation system is implemented in GIS software platform evaluation function can only be operated by professionals, did not achieve true automation professional land suitability evaluation system. In this paper, based on relevant domestic and international GIS-based land suitability evaluation system, the mathematical model library, combined with the secondary development of geographic information system technology, database technology and state-of-the-art suitability assessment method, according to the actual situation of the study area and the purpose of the evaluation to establish suitability evaluation The system model, in accordance with the evaluation step and the setting of the model to achieve the purpose of the evaluation. Suitability evaluation system can not only land spatial data relating to evaluation and land attribute data synthesis, has the flexibility to combine different geographic information analysis and processing of these data, thus greatly improving the efficiency and accuracy of the land suitability evaluation. The main modules of the system are: an operation module. Main the map query function, including maps, zoom in, zoom, mobile, full map display and click query. 2, data management module. Including graphics and attribute data management, such as the addition of the map, save, save, remove the attribute table open, make changes and save the attribute data. 3, spatial analysis module. The layer overlay function, and spatial interpolation sampling points. Overlay function in Figure spots superimposed two vector layers while its property sheet automatic connection. Spatial interpolation to achieve the estimated continuous area characterized by discrete point data distribution, evaluation solved in the case of plane data can not be obtained. The suitability evaluation module. The core module of the system, the system suitability assessment of the steps and methods through programming algorithm mainly the completion of the Analytic Hierarchy Process to establish the membership function libraries and data standardization, the ultimate aim is to divide and rendering suitability rating, intuitive on the map Figure reflects the evaluation grade. 5 thematic maps output module. Result, the output of the carrier, the user can be based on the needs and preferences of the results Figure printout. The set of functions for the system processes the system function module links up to become an independent and complete suitability evaluation system. Access and ADO integrated development technology system and management function model library, Visual Basic 6.0 development tools as a systems integrator and research, in accordance with the method prescribed by the Land Evaluation Platform ArcGIS Engine secondary development of GIS components for developers platform the allocation of land to the actual situation of the regional land suitability type Jiutai City land resources suitable for farming, land suitable for afforestation should park suitability evaluation.

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CLC: > Astronomy,Earth Sciences > Surveying and Mapping > General issues > Mapping database and information system
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