Province-wide comparison tillage quality evaluation method based on GIS

Abstract

A tilled land quality evaluation method based on GIS for province-wide land comparison involves province-level parameter macrocontrol and united standard index system, county-level investigated basic data, united modeling and computation of city-level and four-hierarchy quality inspection mode. The concrete step are as follows: dividing index control area by GIS space superposition technology, hierarchical clustering method, determining evaluation factor by main component analysis method, determining weight by fuzzy hierarchy method, standardizing the factor index by segmental interpolation functions, computing index as natural quality etc. by modular design, constructing combined analog system for tilled land quality factor, dividing tilled land quality level by frequency method and uniformly-spaced method. The invention provides scientific basis for differential precise management for tilled land of province-area even whole country, and has significance to promoting reasonable utilization and protection for tilled land resource, ensuring grain safety of country.

Description

Technical field: [0001] The invention belongs to the field of land evaluation and management, in particular to a GIS-based method for evaluating the quality of comparable cultivated land in provinces. technical background: [0002] Cultivated land quality evaluation is a process of comprehensively and quantitatively assessing and classifying the natural and socio-economic attributes of cultivated land under specific uses (mainly planting crops). [0003] ①Foreign research [0004] There are more than 2,000 years of history in foreign countries on the evaluation of cultivated land quality. In the documents and historical materials of ancient Greece, Egypt, India, and Rome, there are records about the classification of cultivated land. The famous ancient Roman scholar and agronomist Varro proposed in his book "On Agriculture" to classify soil according to "arrangement of the value of farmland". Since the 18th century, with the development of chemistry and geology, scholars ...

AI Technical Summary

Problems solved by technology

[0009] To sum up: the current overall situation of cultivated land quality evaluation in my country is: ① not enough attention is paid to the discussion of cultivated land quality evaluation, and the purpose and significance of its research are unclear; ② some pilot studies have been done on cultivated land quality grades in some areas , but in terms of evaluation methods, expert experience is often combined with manual evaluation and mapping methods, and the methods and means are relatively backward; ③ Regarding the evaluation of cultivated land quality under the support of GIS, especially the research on the classification and grading of agricultural land, there is still no relatively perfect and generalizable research. Practical experience and technical system; ④ There is no clear method and technology for the comparative evaluation of cultivated land quality in large areas and different types of areas

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