Question

对于水文学家来说，Rainfall Hyetograph和Streamflow Hydrograph是常用的。它看起来像下图。

X轴表示日期，左侧Y轴反转表示降雨，右侧Y轴表示放电。

我有一张降雨桌和一张放电桌。

  ####Rain Table####                   ####Discharge Table####
   Date         Value                     Date         Value
2000-01-01       13.2                   2000-01-01      150
2000-01-02       9.5                    2000-01-01      135
2000-01-03       7.3                    2000-01-01      58
2000-01-04       0.2                    2000-01-01      38

这是我的代码。

  ggplot(rain,aes(x=DATE,y=value)) + 
    geom_bar(stat = 'identity')+
    scale_y_reverse()+
    geom_line(data =discharge,aes(x=DATE,y=value))

但我不知道如何在两个不同的Y轴上表示这些值。

Answer 1

在ggplot中使用sec_axis（）函数可以显示第二个轴，它是第一个轴的转换。由于降水可以使用分水岭区域（或排放转换为深度）转换为体积，因此可以使用sec_axis制作水分仪。

library(ggplot2)
library(readr)

df <- read_csv("date, precip_in, discharge_cfs
                2000-01-01, 13.2, 150
                2000-01-02, 9.5, 135
                2000-01-03, 7.3, 58
                2000-01-04, 0.2, 38")

watershedArea_sqft <- 100

# Convert the precipitation to the same units as discharge. These steps will based on your units
df$precip_ft <- df$precip_in/12
df$precip_cuft <- df$precip_ft * watershedArea_sqft

# Calculate the range needed to avoid having your hyetograph and hydrograph overlap 
maxRange <- 1.1*(max(df$precip_cuft) + max(df$discharge_cfs))

# Create a function to backtransform the axis labels for precipitation
precip_labels <- function(x) {(x / watershedArea_sqft) * 12}

# Plot the data
ggplot(data = df,
       aes(x = date)) +
  # Use geom_tile to create the inverted hyetograph. geom_tile has a bug that displays a warning message for height and width, you can ignore it.
  geom_tile(aes(y = -1*(precip_cuft/2-maxRange), # y = the center point of each bar
                height = precip_cuft,
                width = 1),
            fill = "gray50",
            color = "white") +
  # Plot your discharge data
  geom_line(aes(y = discharge_cfs),
            color = "blue") +
  # Create a second axis with sec_axis() and format the labels to display the original precipitation units.
  scale_y_continuous(name = "Discharge (cfs)",
                     sec.axis = sec_axis(trans = ~-1*(.-maxRange),
                                         name = "Precipitation (in)",
                                         labels = precip_labels))

Answer 2

我认为这些评论为不使用ggplot2解决这个问题提出了强有力的理由：它不会优雅或直截了当。所以这是一个使用highcharter包的答案。

我使用了提供的数据作为例子，除了排放日期被改变为与降雨日期相同。

Here is the interactive result以HTML格式发布。

这是截图。我会回应上面的评论：虽然这可能是水文学的标准，但反向双轴非常具有误导性。我认为使用ggplot2进行一些实验，你可以获得更具信息性和吸引力的东西。

library(highcharter)
library(dplyr)

rainfall <- data.frame(date = as.Date(rep(c("2000-01-01", "2000-01-02", "2000-01-03", "2000-01-04"), 2), "%Y-%m-%d"), 
                       value = c(13.2, 9.5, 7.3, 0.2, 150, 135, 58, 38), 
                       variable = c(rep("rain", 4), rep("discharge", 4)))

hc <- highchart() %>% 
  hc_yAxis_multiples(list(title = list(text = "rainfall depth (mm)"), reversed = TRUE), 
                     list(title = list(text = "flow (m3/s)"), 
                      opposite = TRUE)) %>% 
  hc_add_series(data = filter(rainfall, variable == "rain") %>% mutate(value = -value) %>% .$value, type = "column") %>% 
  hc_add_series(data = filter(rainfall, variable == "discharge") %>% .$value, type = "spline", yAxis = 1) %>% 
  hc_xAxis(categories = dataset$rain.date, title = list(text = "date"))

hc

Answer 3

使用基数R：

## Make data
dates <- seq.Date(from=as.Date("2015-01-01"),
              to=as.Date("2015-01-10"), by="days")
flow <- c(0,0,1,3,7,11,8,6,4,5)
rain <- c(0,1,2,5,4,0,0,0,1,0)

## Plot rainfall first
par(xaxs="i", yaxs="i", mar=c(5,5,5,5))
plot(dates, rain, type="h", ylim=c(max(rain)*1.5,0),
 axes=FALSE, xlab=NA, ylab=NA, col="blue",
 lwd=50, lend="square")
axis(4)
mtext("Rainfall", side=4, line=3)

## Plot flow on top
par(new=TRUE)
plot(dates, flow, type="l", lwd=2, ylim=c(0, max(flow)*1.2))

base R plot

使用情节：

## Plotly
library(plotly)
rainAx <- list(
  overlaying = "y",
  side = "right",
  title = "Rain",
  ##autorange="reversed",
  range = c(max(rain)*1.5,0),
  showgrid=FALSE
    )

plot_ly() %>%
add_trace(
    x=~dates, y=~flow,
    type="scatter", mode="lines") %>%
add_trace(
    x=~dates, y=~rain,
    type="bar", yaxis="y2") %>%
layout(yaxis2=rainAx)

plotly plot

Answer 4

我非常喜欢jpshanno的帖子，并且会使用它，因为它很灵活并且适合我正在使用的其他代码。这是我刚刚找到的打包解决方案：

library(EcoHydRology)
dataforhydrograph <- as.data.frame(cbind(date = 1:20, precipitation = runif(20,0,100),discharge  = runif(20,0,100)))
dataforhydrograph$date <- as.Date(dataforhydrograph$date, format = c("%Y-%m-%d"), origin = "1998-01-01")
hydrograph(input=dataforhydrograph)

如何使用ggplot绘制R中的降雨径流图？

4 个答案: