基于MapGIS的Label点法农业地质样点布置方法  

Agricultural geology sample point layout design through MapGIS-based Label point method

作　　者：张固成[1,2] 傅杨荣[1,2] 郭跃品[1] 马荣林[1] 张家友[1] 

机构地区：[1]海南省地质调查院,海南海口570206 [2]中国地质大学(武汉)地球科学学院,湖北武汉430074

出　　处：《物探与化探》2016年第3期614-618,共5页Geophysical and Geochemical Exploration

基　　金：中国地质调查局农业地质调查项目(12120113000700);海南省重点科技项目(ZDXM2014092)

摘　　要：以海南省东部某典型地区市县级农业地质普查为例,介绍了基于Map GIS的Lable点法样点布置方法。该方法首先将海南省第二次土地利用调查的26个土地利用小类归并成水田、旱地、果园、其他园地、林地、建设用地、滩涂、交通用地、水面、其他土地共10大类,图斑总数由9 932个归并为4 257个;然后将归并后的图斑按照面积大小划分为代表性依次降低的A、B、C三个级别;样点布置过程中,A级图斑采用传统500 m×500 m网格化方法布置样点,B级图斑采用基于Map GIS的Lable点法布置样点,C级图斑不布置样点。软件自动布置样点后,经必要的人工调整,在174 km^2的工作区共布置1 610个采样点,样点密度达9.25个/km^2,符合农业地质调查相关规范要求。方法有效性验证显示:与传统单一的333 m×333 m网格化样点布置方法相比,该方法布置的样点在可采性、代表性、准确性、合理性四方面都有显著优势,值得推广应用。With a municipal and county-level agricultural geological survey in a typical eastern region of Hainan Province as a case study,the Map GIS-based Label point method is introduced for sample point layout. The lands involved in the second land use survey of Hainan Province are incorporated into 10 categories comprising dry land,paddy field,orchards,other gardens,woodland,construction land,mudflat,traffic area,water surface and other land,and the number of pattern spots is reduced from 9,932 to 4,257 after the incorporation; then,the incorporated pattern spots are divided into three levels of A,B and C with descending representativeness in accordance with their area sizes; during the layout design of sample points,the traditional 500 m × 500 m grid method is adopted for Level-A pattern spots,the Map GIS-based Label point method for Level-B pattern spots,but no sample point layout design for Level-C pattern spots. After an automatic arrangement of sample points is carried out by software and necessary manual adjustment is conducted,a total of 1,610 sampling points are arranged in the working region covering an area of 174 km^2,and the density of the sample point reaches 9.25 point / km^2,which meets the relevant requirements of the agricultural geological survey. The validation test of the method suggests that,compared with the traditional 333 m×333 m grid method of sample point layout,the method proposed in this paper has significant superiority in workability,representativeness,accuracy and reasonableness and hence deserves extensive promotion and application.

关 键 词：MAPGIS Label点法 图斑 农业地质 样点布置方法 土地利用调查 

分 类 号：P632[天文地球—地质矿产勘探]