Farming landscape space structure loss evaluation method

A technology of spatial structure and evaluation method, applied in data processing applications, forecasting, instruments, etc.

Inactive Publication Date: 2013-09-11
GUANGZHOU UNIVERSITY
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Problems solved by technology

There are many studies on the spatial structure and evolution of urban land use at home and a

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  • Farming landscape space structure loss evaluation method
  • Farming landscape space structure loss evaluation method
  • Farming landscape space structure loss evaluation method

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Embodiment Construction

[0038] According to the vector land use data of different time phases, use the Features to Raster in ArcGIS software (that is, the vector data rasterization function) to convert it into raster data with a resolution of 30m×30m, and then use the Raster Calculator (that is, the raster data to Data calculation function) to extract the landscape information of cultivated land reduction in Zhuhai City during 1973-1988, 1988-1998, and 1998-2008. Convert the raster data into vector data through the Raster To Features of ArcGIS (that is, the function of converting raster data into vector data), and extract the information layer of the reduced cultivated land. Then use Feature Envelop to Polygon (that is, the function of generating the smallest bounding box from vector data) to generate the smallest bounding box for the newly reduced cultivated land landscape patch. If the patch is rectangular, its smallest bounding box needs to be enlarged. Then, the generated bounding box and the ori...

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Abstract

The invention relates to a farming landscape space structure loss evaluation method, and belongs to the field of land survey and evaluation. The farming landscape space structure loss evaluation method includes the steps: (1) utilizing geographic information system software for converting vector land use data of each time phase into raster data; (2) extracting farmland decrease landscape information of an evaluated region in each time period; (3) converting the raster data into vector data, and extracting an information layer of farmland decrease; (4) generating a minimum bounding box from newly decreased farming landscape patches; (5) computing landscape loss indexes of newly decreased farmland; (6) drawing a broken line graph of the LLIs (landscape loss indexes) in each time period, making statistics on peak values of high proportion according to patch number of LLI peak value intervals in the broken line graphs of the LLIs, and using the peak values as LLI threshold dividing criteria for dividing farming landscape space structure loss types and farming landscape space structure loss distribution maps. By the method, landscape structure change rules and relation between landscape decrease spatial mode and landscape pattern can be obtained, and changing processes of the landscape pattern in two or more time phases can be described.

Description

technical field [0001] The invention relates to a method for evaluating the loss of cultivated land landscape spatial structure, in particular to a method for comprehensively evaluating the spatial structure change of two-dimensional data by using geographic information system technology, which belongs to the field of land investigation and evaluation. Background technique [0002] The evolution of land use landscape spatial structure is a very complex process. There are many studies on the spatial structure and evolution of urban land use at home and abroad, but there are few studies on the spatial structure and evolution of cultivated land use. In fact, there are many similarities between the spatial structure of cultivated land use and the spatial structure of urban land use. For example, with the continuous expansion of the city, it will inevitably occupy a large amount of surrounding cultivated land, and the cultivated land will be converted into the city. The correspo...

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Application Information

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IPC IPC(8): G06Q10/04G06F17/30
Inventor 吴大放董玉祥刘毅华刘艳艳
Owner GUANGZHOU UNIVERSITY
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