编辑:更新以使用更有意义的数据。原始响应位于底部。
这张地图...
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...可以使用以下代码生成:
library(ggplot2)
library(maptools)
# grab earthquake data [source: USGS Earthquake Hazards Program]
url <- "http://comcat.cr.usgs.gov/fdsnws/event/1/query"
querystring <- "starttime=2012-01-01T00:00:00Z"
querystring <- paste(querystring,"minmagnitude=6", sep="&") # magnitude >= 6
querystring <- paste(querystring,"mindepth=0", sep="&")
querystring <- paste(querystring,"maxdepth=1000", sep="&") # depth <= 1000 km
querystring <- paste(querystring,"format=csv", sep="&") # return CSV file
uri <- paste(url,querystring,sep="?")
ggQuakes <- read.table(header=T,sep=",", file=uri)
# grab world map [built into maptools package]
ggMap <- fortify(wrld_simpl)
# create map payers
ggp <- ggplot(ggQuakes)
ggp <- ggp + geom_point(aes(x=longitude ,y=latitude ,color=depth ,size=mag), alpha=0.8)
ggp <- ggp + scale_size(range=c(4,8))
ggp <- ggp + scale_color_gradient(low="#aaaaaa", high="#cc0000")
ggp <- ggp + geom_path(data=ggMap, aes(x=long, y=lat, group=group))
ggp <- ggp + coord_equal()
ggp <- ggp + theme(legend.position="bottom")
# render map
print(ggp)
原始回复:
如果您提供更具代表性的样本数据会更好,但调用您的数据集gg
,
library(ggplot)
ggplot(gg) +
geom_point(aes(x=X,y=Y,color=Z,size=log(E)), alpha=0.5) +
scale_size(range=c(4,8)) + # sets minimum and maximum size
scale_color_gradient(low="#aaaaaa", high="#cc0000")
我使用了对数(能量)标度,因为水平是如此不同。
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