小编Pat*_*ams的帖子

我正致力于使用Raster和RMarkdown记录一些空间数据的可视化,但我遇到的问题是每个图上方都有一堆负空间.这是RMarkdown代码(稍微简化):

```{r global_options, include=FALSE}
knitr::opts_chunk$set(fig.width=12, fig.height=8, echo=FALSE,
                      warning=FALSE, message=FALSE)
```

```{r r-packages}
library(maptools)
library(raster)
library(rgdal)
```
###Description of data
Data are taken from the National Land Cover Database - 2011 and represent land cover at a 30m X 30m resolution.
location of data: [National Land Cover Database - 2011]('http://gisdata.usgs.gov/TDDS/DownloadFile.php?TYPE=nlcd2006&FNAME=nlcd_2006_landcover_2011_edition_2014_10_10.zip')

###Import raster file for US landcover and shapefile for state borders and counties

```{r Import raster file for us landcover}
rfile <- '~/Documents/Data/nlcd_2006_landcover_2011_edition_2014_10_10/nlcd_2006_landcover_2011_edition_2014_10_10.img' #location of raster data
r1 <- raster(rfile)

##Import …