总结一些用于土壤制图的R包
R对土壤数据的制图（digital soil mapping DSM）支持的功能还是比较全面的，本文主要整理一下最近用到的、不可或缺的R packages，主要分为：
- （1）GIS：空间数据（矢量和栅格）处理和分析，包括sp、raster、rgdal、RSAGA、maptools；
- （2）模型：土壤制图所需要的分类模型，包括caret、Cubist、C5.0、gam、nnet、gstat；
- （3）出图：探索性分析和出图，包括ggplot2；
- （4）专业：包括soilPhysical(如土壤水分特征曲线的分析)，soilTexture，GSIF。
各包具体链接如下：
GIS
- sp: http://cran.r-project.org/web/packages/sp/index.html.
- raster: http://cran.r-project.org/web/packages/raster/index.html.
- rgdal: http://cran.r-project.org/web/packages/rgdal/index.html.
- RSAGA: http://cran.r-project.org/web/packages/RSAGA/index.html.
- maptools：http://cran.r-project.org/web/packages/maptools/index.html
Modelling
- caret: http://cran.r-project.org/web/packages/caret/index.html.
- Cubist: http://cran.r-project.org/web/packages/Cubist/index.html.
- C5.0: http://cran.r-project.org/web/packages/C50/index.html.
- gam: http://cran.r-project.org/web/packages/gam/index.html.
- nnet: http://cran.r-project.org/web/packages/nnet/index.html.
- gstat: http://cran.r-project.org/web/packages/gstat/index.html.