用R / ggplot / ggmap填充轮廓图 [英] Filled contour plot with R/ggplot/ggmap

问题描述

我无法在R中使用ggmap / ggplot2在地图顶部绘制填充轮廓图。

我的数据是有规律地间隔纬度/经度坐标az值表示降雨量

 > （洪水）
 lat lon雨
 1 22.51916 -105.9318 1.486188e-05 
 2 22.59956 -105.9318 1.735962e-05 
 3 22.67996 -105.9318 2.024598e-05 
 4 22.76037 -105.9318 2.357599e-05 
 5 22.84077 -105.9318 2.741153e-05 
 6 22.92117 -105.9318 3.182212e-05 
  

使用ggmap获取基本地图后，我正在试图填充充满雨的轮廓

  map = ggmap（baseMap）+ 
 geom_contour（data = flood，aes（x = lon，y = lat，z = rain））+ 
 scale_fill_continuous（name =Rainfall（inches） ，low =yellow，high =red）
  

这给我一个错误

 单位错误（tic_pos.c，mm）：'x'和'单位'必须有长度> 0 
  

如果我这样做

pre > map = ggmap（baseMap）+
geom_contour（data = flood，aes（x = lon，y = lat，z = rain，fill = ..level ..））+
scale_fill_continuous（name =Rainfall（inches），low =yellow，high =red）


没有实际的填充，我得到这个图。

I一直试图遵循这篇文章和
这篇文章，但我无法为我的理解问题。我对ggplot / R知之甚少，但到目前为止，我已经能够蹒跚而行。什么是..level ..是什么意思？

我认为可能是相关的，但我不能一概而论的修复工作轮廓图。

解决方案

如果没有更具代表性的数据集（您能否提供链接？），无法测试。

尽管如此，请尝试：

  ##未经测试.. 
 map = ggmap（baseMap）+ 
 stat_contour（data = flood，geom =polygon，
 aes（x = lon，y = lat，z = rain，fill = ..level ..））+ 
 scale_fill_continuous（name =降雨（英寸），低=黄，高=红）
  

问题是geom_contour不尊重 fill = ... 。你需要使用 stat_contour（...）和 geom =polygon（而不是line）。

I'm having trouble plotting a filled contour plot on top of a map with ggmap/ggplot2 in R.

My data are regularly spaced lat/lon coordinates with a z value indicating rainfall

> head( flood )
   lat       lon         rain
1 22.51916 -105.9318 1.486188e-05
2 22.59956 -105.9318 1.735962e-05
3 22.67996 -105.9318 2.024598e-05
4 22.76037 -105.9318 2.357599e-05
5 22.84077 -105.9318 2.741153e-05
6 22.92117 -105.9318 3.182212e-05

After getting the base map with ggmap, I'm trying to overplot filled contours of rain

map = ggmap( baseMap ) + 
    geom_contour( data = flood, aes( x = lon, y = lat, z = rain ) ) +
    scale_fill_continuous( name = "Rainfall (inches)", low = "yellow", high = "red" ) 

This gives me an error of

Error in unit(tic_pos.c, "mm") : 'x' and 'units' must have length > 0

If I do

map = ggmap( baseMap ) + 
    geom_contour( data = flood, aes( x = lon, y = lat, z = rain, fill = ..level.. ) ) +
    scale_fill_continuous( name = "Rainfall (inches)", low = "yellow", high = "red" ) 

I get this plot without the actual fill.

I've been trying to follow this post and this post, but I can't get it right for my problem. I don't know much about ggplot/R, but I've been able to stumble through it so far up to now. What does ..level.. mean?

I think this post may be related, but I can't generalize the fix to work for contour plots.

解决方案

It's impossible to test without a more representative dataset (can you provide a link?).

Nevertheless, try:

## not tested..
map = ggmap( baseMap ) + 
    stat_contour( data = flood, geom="polygon", 
                  aes( x = lon, y = lat, z = rain, fill = ..level.. ) ) +
    scale_fill_continuous( name = "Rainfall (inches)", low = "yellow", high = "red" ) 

The problem is that geom_contour doesn't respect fill=.... You need to use stat_contour(...) with geom="polygon" (rather than "line").

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