基于空间平衡法的县域耕地质量监测布样方法
县域监测样点布局是反映耕地质量等级变化的基础,样本点布设的质量直接影响到耕地质量监测的结果和精度。因此,该文提出了基于空间平衡法的县域耕地质量监测布样方法,对影响耕地质量监测成本和精度的主要因素进行分析,选取样本点距离道路远近、样本点所在位置坡度高低和自然质量各等别样本容量3个方面综合生成包含概率栅格图层,图层中的像元值指总体单元中一个单元相对于其他单元被抽中的相对概率,在此基础上,运用空间平衡算法对包含概率栅格层进行空间改造,抽样选取监测样点,以平均Kriging预测标准差和监测样本点距县级主要道路的平均距离作为优化评价准则,将该方法与传统抽样方法进行比较分析。以江西省吉安县为例,全县布设7...
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| Published in | 农业工程学报 no. 24; pp. 274 - 280 |
|---|---|
| Main Author | |
| Format | Journal Article |
| Language | Chinese |
| Published |
国土资源部农用地质量与监控重点实验室，北京 100035%中国土地勘测规划院科技处,北京,100035
2015
中国农业大学信息与电气工程学院，北京 100083 |
| Subjects | |
| Online Access | Get full text |
| ISSN | 1002-6819 |
| DOI | 10.11975/j.issn.1002-6819.2015.24.042 |
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| Abstract | 县域监测样点布局是反映耕地质量等级变化的基础,样本点布设的质量直接影响到耕地质量监测的结果和精度。因此,该文提出了基于空间平衡法的县域耕地质量监测布样方法,对影响耕地质量监测成本和精度的主要因素进行分析,选取样本点距离道路远近、样本点所在位置坡度高低和自然质量各等别样本容量3个方面综合生成包含概率栅格图层,图层中的像元值指总体单元中一个单元相对于其他单元被抽中的相对概率,在此基础上,运用空间平衡算法对包含概率栅格层进行空间改造,抽样选取监测样点,以平均Kriging预测标准差和监测样本点距县级主要道路的平均距离作为优化评价准则,将该方法与传统抽样方法进行比较分析。以江西省吉安县为例,全县布设78个监测样点,结果表明,当样点数量相同时,该方法相较传统布样方法在抽样精度和抽样成本方面均有一定的优势,能有效地监测耕地质量变化,满足县域耕地质量监测的需求。 |
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| AbstractList | F301.21; 县域监测样点布局是反映耕地质量等级变化的基础，样本点布设的质量直接影响到耕地质量监测的结果和精度。因此，该文提出了基于空间平衡法的县域耕地质量监测布样方法，对影响耕地质量监测成本和精度的主要因素进行分析，选取样本点距离道路远近、样本点所在位置坡度高低和自然质量各等别样本容量3个方面综合生成包含概率栅格图层，图层中的像元值指总体单元中一个单元相对于其他单元被抽中的相对概率，在此基础上，运用空间平衡算法对包含概率栅格层进行空间改造，抽样选取监测样点，以平均Kriging预测标准差和监测样本点距县级主要道路的平均距离作为优化评价准则，将该方法与传统抽样方法进行比较分析。以江西省吉安县为例，全县布设78个监测样点，结果表明，当样点数量相同时，该方法相较传统布样方法在抽样精度和抽样成本方面均有一定的优势，能有效地监测耕地质量变化，满足县域耕地质量监测的需求。 县域监测样点布局是反映耕地质量等级变化的基础,样本点布设的质量直接影响到耕地质量监测的结果和精度。因此,该文提出了基于空间平衡法的县域耕地质量监测布样方法,对影响耕地质量监测成本和精度的主要因素进行分析,选取样本点距离道路远近、样本点所在位置坡度高低和自然质量各等别样本容量3个方面综合生成包含概率栅格图层,图层中的像元值指总体单元中一个单元相对于其他单元被抽中的相对概率,在此基础上,运用空间平衡算法对包含概率栅格层进行空间改造,抽样选取监测样点,以平均Kriging预测标准差和监测样本点距县级主要道路的平均距离作为优化评价准则,将该方法与传统抽样方法进行比较分析。以江西省吉安县为例,全县布设78个监测样点,结果表明,当样点数量相同时,该方法相较传统布样方法在抽样精度和抽样成本方面均有一定的优势,能有效地监测耕地质量变化,满足县域耕地质量监测的需求。 |
| Abstract_FL | As a large agricultural country, China has a large population but not enough cultivated land. In 2011, the cultivated land per capita was 0.09 hm2, only 40% of the world average level; and it is getting worse with the rapid development of economy, industrialization and urbanization. Through the monitoring network for cultivated land quality in county area, the distribution and change trend of the cultivated land quality can be reflected. Besides, the quality of non-sampled locations should also be estimated with the data of sampling points. Therefore, this paper proposes a new sampling method for monitoring the quality of arable land in county area based on spatial balanced sampling, which is a pre-processing method to determine the number of sampling points, including preprocessing the data of cultivated land quality before sampling, exploring the spatial correlation and spatial distribution pattern of cultivated land quality, and computing the appropriate quantity of sampling points by analyzing the change trend of sampling number and sampling precision. And the spatial balanced sampling method is aimed to optimize spatial sampling design for setting up the monitoring network. It is required for sampling of a population to understand the trends and patterns in natural resource management because of the financial and time constrains. Spatial balanced sampling provides the mathematical foundation for statistical inference, and is efficient but remains flexible to inevitable logistical or practical constrains during filed data collection. There are integrated factors that affect arable land quality inventory and monitoring, such as geomorphic conditions, altitude, gradient and transport cost. Factors are commonly used to modify sampling intensity; some factors, such as category, gradient, or accessibility, can be readily incorporated into the spatially balanced sampling design. In this paper, we take the distance between the sampling points and the main roads, the slope of terrain and the sample size of each grading according to stratification sampling method as primary factors to generate the raster layer containing probability, by considering the cost of monitoring and the precision of estimation; and on this basis, the monitoring samples are selected by spatial balanced sampling method. Taking the Kriging standard error and the transport cost as the optimization criterion, the experiments in Ji'an County are conducted to compare this method with traditional sampling method in cost (the average distance between the sampling points and the main roads) and estimation accuracy (the mean of Kriging standard error). Seventy-eight monitoring of reference sample units are finally deployed, and the average of ordinary Kriging standard error of the proposed method is 140.23, which is smaller than the simple random sampling (216.96), the stratified sampling (157.14) and the traditional grid random sampling (152.70); the transport cost of this method is 2 277.95 m, which is lower than the simple random sampling (2658.93), the stratified sampling (2726.59) and the traditional grid random sampling (3221.83) when the quantity of samples is the same. Therefore, the result illustrates that the estimation accuracy of this method is higher than the simple random sampling, the stratified sampling, or the traditional grids random sampling when the number of sampling points is 78. Besides, the transport cost of this method is significantly lower than the traditional methods. Therefore, this method can meet the need of montoring the classification of cultivated land in county area. |
| Author | 杨建宇 岳彦利 宋海荣 叶思菁 赵龙 朱德海 |
| AuthorAffiliation | 中国农业大学信息与电气工程学院;国土资源部农用地质量与监控重点实验室;中国土地勘测规划院科技处 |
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| Author_FL | Song Hairong Yue Yanli Yang Jianyu Zhu Dehai Ye Sijing Zhao Long |
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| Keywords | 耕地质量 land use spatial balanced sampling 监测 空间平衡法 抽样 sampling arable land quality 土地利用 monitoring |
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| Notes | Yang Jianyu;Yue Yanli;Song Hairong;Ye Sijing;Zhao Long;Zhu Dehai;College of Information and Electrical Engineering, China Agricultural University;Key Laboratory for Agricultural Land Quality, Monitoring and Control of the Ministry of Land and Resources;Science and Technology Department, Chinese Land Surveying and Planning Institute 11-2047/S |
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| Snippet | 县域监测样点布局是反映耕地质量等级变化的基础,样本点布设的质量直接影响到耕地质量监测的结果和精度。因此,该文提出了基于空间平衡法的县域耕地质量监测布样方法,对影响... F301.21; 县域监测样点布局是反映耕地质量等级变化的基础，样本点布设的质量直接影响到耕地质量监测的结果和精度。因此，该文提出了基于空间平衡法的县域耕地质量监测布样... |
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| SubjectTerms | 土地利用;监测;抽样;空间平衡法;耕地质量 |
| Title | 基于空间平衡法的县域耕地质量监测布样方法 |
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