现在很多包都利用了sp包中的类,如:rgdal,maptools。 2)处理空间数据(Handling spatial data): spsurvey包提供做概率抽样的函数(http://cran.r-project.org/web/packages/spsurvey/index.html);trip包扩展sp包的类,针对动物跟踪数据(http://cran.r-project.org/web/packages/trip/index.html);hdeco包用等级...
Thus, applying map algebra using the developed GWR model generated a raster map with 3065×6530m 2 cell size. The map showed that SOC composition to 20cm depth varied from 3.5 to 85.0 metric tons per hectare (ton/ha) with a mean and standard deviation of about 23.9 and 9.3ton/ha, ...
In order to analyze the influence of each variable on land use efficiency in each province, the coefficient distribution map for the influencing factors was created (Fig. 3). PGDP was an important indicator of the level of economic development, and its regression coefficient exhibited a characteri...