R-ggmap中的非正方形(矩形)地图

问题描述

我需要在非正方形地图中绘制空间数据.

I need to plot spatial data in a non-square map.

我一直在使用ggmap，应该可以得到非平方的地图，这些地图提供了低西角和右上角的坐标.但是，实际上，它似乎不起作用(在此处报告，并且此处).

I have been using ggmap, and supposedly you can get non squared maps giving low-west-corner and upper-right-corner coordinates. However, actually it seems it doesn't work (reported here and here).

有人知道如何在R/ggmap中获得矩形地图吗?

Anyone knows how to get rectangular maps in R/ggmap?

推荐答案

如果您可以不用Google Maps居住，那么有许多简便而又直接的替代方法(我已经包括了CloudMade，但我没有企业帐户):

If you can live without Google Maps, there are easy, immediate alternatives (I'd've included CloudMade but I don't have an enterprise account):

library(ggmap)

loc <- c(-96, 29.4, -94, 30.2)

# gmaps

tx_map_gmaps <- get_map(location=loc, source="google", maptype="terrain")
gg <- ggmap(tx_map_gmaps)
gg

# openstreetmap

tx_map_osm <- get_map(location=loc, source="osm")
gg <- ggmap(tx_map_osm)
gg

# stamen

tx_map_stamen <- get_map(location=loc, source="stamen", maptype="toner")
gg <- ggmap(tx_map_stamen)
gg

而且，如果您愿意摆弄初始缩放设置&然后进行裁剪(也许还有一些平铺的纹理)，您可以可以使用Google Maps做到这一点:

And, if you're willing to fiddle with initial zoom settings & then cropping (and, perhaps, some tile graininess), you can do it with Google Maps:

tx_map_gmaps <- get_map(location=loc, source="google", maptype="terrain")
gg <- ggmap(tx_map_gmaps)
gg <- gg + scale_y_continuous(limits=c(29.5, 30.0))
gg

(我并没有说过最初的变焦，但您一定能够理解这个主意.)

(I didn't fiddle with said initial zoom, but you shld be able to get the idea.)

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