省级农用地分等的质量控制方法研究

与县级农用地分等相比,省级农用地分等具有以下特点:县与县之间的等别要有可比性、行政区域边界等别要协调(能接边)、多层次,即一次工作可同时完成省、市、县三级成果、数据管理难度大等.因此在以省为单位进行农用地分等时,如何保证分等成果的质量成了关键技术问题.河南省采用过程控制和多途径结果检验相结合,对农用地分等质量进行控制.过程监控是指从工作底图标准化开始,到基础数据的调查整理与录入、分等参数选择、指数计算等,都要保证工作过程的每一个环节科学、准确;多种途径对成果进行检验包括宏观规律分析、微观差异分析、分等指数的统计分析、等别收益验证、与以往成果对比分析、实地验证等,多方面检验成果是否合理、是否符合实际.河南省农用地分等实践证明,过程控制和多途径结果检验相结合的质量控制方法,在保证分等结果科学性与合理性(符合实际)基础上,又保证了县级分等成果精度,符合技术<规程>的要求、解决了行政区域边界接边的困难、省域内分等成果的可比,而且省时、省力.

Quality Control Method of Agricultural Land Classification at Provincial Level

Compared with the agricultural land classification at county scale,the agricultural land classification at province scale has the following characteristics: the grades among counties should have comparability,the grade at administrative borders should be connectible and multi-levels,that is to say,it can finish province and prefecture and county work at one time,and it is very difficult in data management.How to guarantee the quality of the classification result becomes the key technical problem when carrying on the agricultural land classification at provincial scale.Henan province takes process control combined with multi-approach examination to control the quality of agricultural land classification. The process control means that every step in agricultural land classification should be scientific and accurate,such as the standardization of base map,the basic data's investigation and settlement and input,the choice of classification parameter,the calculation of index etc.Multiple channel examination of the achievement includes macroscopical analysis of law,microscopic analysis of classification difference,statistical analysis of the classification index,validation with the income,comparison and analysis with the former result,examination on the spot,whether it is reasonable and corresponding to reality. The agricultural land classification practice in Henan province proves that the quality control method not only guarantees the scientificity and reasonability of the classification result,it also guarantees the precision demand at county scale level,which accords with the regulation,solves the difficulties in connecting administrative border and the comparability of provincial classification result,and save time and efforts.The method combines course control with examination in many ways.