ggmap

问题 I'm plotting a map, which is supposed to have an overlay of several (> 400) arrows from a dataset, which has lat/lon pairs for both start and end of each arrow. Here is a subset of the data using dput: df <- structure(list(Lat = c(49.34054, 49.34068, 49.3409, 49.34106, 49.34116, 49.34133, 49.34138, 49.34144, 49.34155, 49.34164, 49.34168, 49.34178, 49.34179, 49.34187, 49.34199, 49.34202, 49.3421, 49.34219, 49.34226, 49.34236, 49.3424), Lon = c(-117.76365, -117.76433, -117.76474, -117.76575,

问题 I want to visualize a dataframe with R and the ggmap package. df: | lon | lat | |-----------|-----------| | 6.585863 | 51.09021 | | 8.682.127 | 50.11092 | | 7.460.367 | 5.152.755 | I created a map with mapImageData <- get_googlemap( + "Germany", + zoom=15 + ) And then wanted to add the geocodes: ggmap(mapImageData) + + geom_point(aes(x=lon, y=lat), data=df, colour="red", size=5) But I get the error: Error: geom_point requires the following missing aesthetics: x, y What am I doing wrong? 回答1:

问题 For the below data > head(df) Date Longitude Latitude Elevation Max.Temperature Min.Temperature Precipitation Wind Relative.Humidity Solar RO 1 2014-07-01 77.1875 7.96184 -9999 27.725 26.673 16.115560560 8.395378 0.8132272 23.08192 Yes 2 2014-07-02 77.1875 7.96184 -9999 27.931 26.897 0.700378560 8.062267 0.8074675 21.48473 Yes 3 2014-07-03 77.1875 7.96184 -9999 28.179 26.686 0.000000000 9.465022 0.8107901 24.14900 No 4 2014-07-04 77.1875 7.96184 -9999 27.657 26.545 0.003433226 9.397203 0

问题 I made static heatmaps with the library(ggmap) and the stat_density2d() function. Looking to recreate this in a shiny app on a dynamic leaflet map, I found addHeatmap() . However, the resulting images are dissimilar, with the ggmap version seemingly offering the correct result. GGMAP LEAFLET What is causing this difference? To run both of the below reproducible examples, you can download some data (csv file) I put here. https://drive.google.com/drive/folders/0B8_GTHBuoKSRR1VIRmhOUTJKYU0?usp

问题 I have the Google map and a list of coordinates with a text label. When I preview this, the labels overlap and thus become unreadable: library(ggmap) WPmap <- qmap(c(lon=4.80324, lat=52.40738), zoom = 12, source = "google") table kaart_rtw: Naam lat lon 1 Nieuw-Zeelandweg 52.40466 4.80214 2 Portsmuiden 52.39014 4.78554 3 Westhavenweg 52.41602 4.82282 4 Westhavenweg 52.41702 4.82282 5 Westhavenweg 52.41802 4.82282 6 Deccaweg 52.40196 4.83910 7 Coenhavenweg 52.40364 4.86195 AmsterdamMap + geom

问题 I have been trying to make a different this lovely flowing data visualization for some time this week but keep hitting a snag in the final implementation. Here is the data set I'm using. I have melded it into a frame with the three key bits of information I want to display: startinglatlong, endinglatlong, and number of trips. I got closest using the idea posted here, but two hit a snag on two items: 1) making the size of the line change based on the number of trips 2) getting the google api

问题 I am wondering how to draw a map using get_map and ggmap of any federal country (i.e. a country with provinces and counties). Any country, other than the US would be great. To make it look nice, fill the geom_polygon of counties (any fill), and provinces are empty polygons, only with its contours. So, basically, it is two overlapping ggmaps. You can get the shapefiles here: https://www.dropbox.com/s/4nl685t860x1e8r/municipios_br.zip rm(list = ls()) library(ggplot2) library(rgdal) library

问题 I am having clipping problems when I try to combine ggmap with shape files. The example in Kahle and Wickham (2013: 158) works fine because the raster image from ggmap covers the entire shape file. Below is an example of what happens when I try to plot the shape file for U.S. states on a ggmap plot that covers a smaller area. The ggmap shows New York City and I want to overlay it with the borders for U.S. states (just as an example). The resulting map doesn't make any sense. The problem is

问题 FYI: I'm fairly new to ggplot2 and ggmap so I apologize for the sloppy code but it is the only way I've been able to plot sets of groups of points where each group has it's own color. Also my os is ubuntu. I'm trying to add a legend, to a ggmap object and in particular a legend with a continuos gradient transitioning the colors. Any advice? I've tried the legend attribute in ggmap but it doesn't seem to be working. Below is what I have so far. syd = get_map(location = center, zoom = zoom,

问题 FYI: I'm fairly new to ggplot2 and ggmap so I apologize for the sloppy code but it is the only way I've been able to plot sets of groups of points where each group has it's own color. Also my os is ubuntu. I'm trying to add a legend, to a ggmap object and in particular a legend with a continuos gradient transitioning the colors. Any advice? I've tried the legend attribute in ggmap but it doesn't seem to be working. Below is what I have so far. syd = get_map(location = center, zoom = zoom,