Questions tagged [ggplot2]

Use this tag when referring to the R package for high level data visualization and mapping.

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10
votes
1answer
5k views

R fortify causing polygons to tear

I'm am having some trouble plotting my spatial data using ggplot2. The map looks fine when plotted using spplot, so I'm assuming that the tearing occurs at the fortify stage. The code is as follows: ...
2
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0answers
409 views

About shp for ggmap in the R

I am a new in R and GIS, so I kindly ask you on advice. I had a shp which I want to plot on google map. The shpfile is here: http://www.filedropper.com/exercisestanddata First I do this: ogrInfo(...
3
votes
1answer
13k views

Why is my stacked area graph in ggplot2 returned as stacked lines? [closed]

I'm having a bit of a problem creating my stacked area chart in ggplot2 in R, for some reason it is returning as a stacked line; e.g. data: library(ggplot2) Sector <- rep(c("S01","S02","S03","...
1
vote
1answer
228 views

How can i plot this piece of code with ggplot2? [closed]

I have these vectors of the lakes in New Guinea and the coastline and i want to plot it using ggplot2 exactly as it follows but with a more cool appearance. co<-coastline.shp nglakes<-lakes....
1
vote
1answer
430 views

Phantom artifacts after converting to Robinson projection

I'm using ggplot to create a map using the Robinson projection. Ultimately, I'll be plotting individual countries, but I need to provide continent boundaries as a background layer (since some ...
8
votes
1answer
4k views

ggmap: clip a map

I'm using ggmap to grab Washington DC and I have a shapefile that I downloaded from here: library(ggplot2) library(ggmap) library(maptools) dc = get_map(location = 'DC', zoom = 12) nhbds = ...
12
votes
2answers
4k views

Point overplotting on maps in R (e.g. with ggplot2) - how to push points to the side, mark original positions, combine close-by points ...?

I've got a database containing languages, their longitudes and latitudes and a feature value (either category 1, category 2 or both - in the plot these are marked red, blue and green respectively). ...
0
votes
1answer
532 views

TopologyException error during fortify SpatialPolygonsDataFrame

I tried to reproduce a recent question on spatial data visualization using ggplot2 and received the following error message during fortify(world, region = "ISO3"): Error: TopologyException: Input ...
6
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1answer
2k views

Plotting data without geographical coordinates besides the main map in ggplot2

I am trying to plot some data as a bubble chart on the world map using ggplot2 package in R. I am able to proceed as follows. # Load necessay packages library(ggplot2) library(rworldmap) library(...
1
vote
1answer
1k views

ggplot2 plots polygons with wrong topologies

I'm trying to plot polygons in R using ggplot2. In GRASS, QGIS and normal R the map renders fine, but ggplot2 seems to have some kind of topological difficultes I can't explain. With normal R it looks ...
6
votes
1answer
2k views

Geographic Heatmaps with Concentric Circles by Distance?

I'm looking to generate a geographic heatmap (using 'ggmap') that overlays some dimension (to start, housing prices) over the lat/lon near a city center. Then I want to create circles of equi-distant ...
5
votes
1answer
713 views

Plotting islands in ggplot2

I'm trying to plot bodies of water on my map and struggling with islands in ggplot2. I understand the right/left-hand rule for exterior/interior rings but there is still a problem going from island to ...
0
votes
1answer
1k views

R using fortify to project shapefile on google map gives wrong results

I have a shapefile that looks like this > str(FieldsMap) Formal class 'SpatialPolygonsDataFrame' [package "sp"] with 5 slots ..@ data :'data.frame': 3 obs. of 2 variables: .. ..$ id : ...
2
votes
0answers
99 views

Solving coordinate differences between packages

I have two maps generated by two different methods. The first, I used maps package and the function map() and symbols(). On the other hand, I used the ggmap package with the ggmap() and geom_point() ...
9
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0answers
2k views

How to prevent cross-world lines in ggplot world map?

I'm having issues displaying 'great circles' paths and polygons in ggmap, an extension of ggplot2. Please enter the following code to replicate my issues: https://gist.github.com/Robinlovelace/...
1
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2answers
2k views

Is there a county-level maps dataset that includes independent cities in virginia?

The following code shows the dataset I am working with: library(maps) CountyMapData <- map_data("county") head(CountyMapData) long lat group order region subregion 1 -86.50517 32....
19
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5answers
41k views

Converting osm file to shapefile (or data frame) in R

I was looking for a road shapefile for Australia today. I ended up going to Geofabrik. Open Street Map has data in .osm format. But they do not have one in .shp for Australia. If possible, I want to ...
4
votes
1answer
551 views

Projection mismatch when plotting precipitation with ggplot

I'm trying to plot accumulated precipitation in Brazil for a given period, see code below: Load packages library(raincpc) library(SDMTools) library(raster) library(ggplot2) library(rgdal) library(...
0
votes
1answer
663 views

ggmap fortify start and end jumble

I have a census tiger line file for counties available from the Census website. I am trying to display this file on a ggmap, but fortify seems to jumble the regions. I can't find anyone else who has ...
1
vote
1answer
2k views

Color region polygons according to cluster label?

I want to present data on a map of our country. I have used R for showing the clusters on a country! Here the steps I took: setwd('D:/r/cluster2') channel <- odbcConnectExcel('cluster.xls') data &...
1
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0answers
943 views

Trying to Create a Global Choropleth Population Density Map then add Biodiversity Level

I am trying, quite unsuccessfully, to create a global choropleth population density map for a specific 120 countries, using ggplot2. Once I have created this choropleth map, I want to add number of ...
9
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2answers
1k views

Help choosing most suitable bivariate choropleth mapping coloring scheme

I am trying to overlay a nominal variable (2 categories - rainfed vs irrigated) in a choropleth map over a numeric variable. In order to highlight the difference in pattern among the two categories, ...
4
votes
2answers
2k views

How can I create a choropleth from the 2010 census ZCTA shapefile using R and ggplot2?

I have created state and county choropleths in R using ggplot2. The method I have used for this came from Winston Chang's "R Graphics Cookbook". For those choropleths the map was already represented ...
2
votes
1answer
206 views

Shapefile for linked micromap is not working

I am trying to replicate the example provided in the micromap R package of a linked map with the poverty rate for the 50 US states. I am trying to achieve the same results with a Shapefile from ...
3
votes
1answer
757 views

plotting a SpatialPolygons object using lines() without lines connecting separate polygons

This is almost an extension of a question asked on stackoverflow (https://stackoverflow.com/questions/12196440/extract-feature-coordinates-from-spatialpolygons-and-other-sp-classes), so I'll use the ...
3
votes
2answers
1k views

How to use ggplot with Processing in QGIS 2.0?

I'm trying to use R scripts within QGIS thanks to Processing. There are some example scripts available and I achieved to plots different columns of the attribute table (with the plot built-in package)....
2
votes
2answers
992 views

Plotting a certain range in azimuthal projection using ggplot2

I would like to limit a map to a particular range of values (i.e. northern hemisphere) under an azimuthal or orthographic projection in ggplot2. When I set ylim, I receive an error message that ...
1
vote
1answer
2k views

Can't plot polygons with R: Invalid number of points in LinearRing found 3 - must be 0 or >= 4?

I want to plot a map of my region, with colour filled polygons using R. I have downloaded municipal (lines) and province (polygons) boundaries. I've used SAGA to merge municipal and province shapes to ...
4
votes
0answers
1k views

Fortifying re-projected shapefile for ggplot2 in R

I have a shapefile of US county boundaries which I got from the NHGIS. I can load the file using the rgdal package and see information about it: library(rgdal) shp_1860 <- readOGR("shp", "...
6
votes
1answer
3k views

Loading a png image as a map with ggplot2/ggmap

I am trying to find a workaround for ggmap's missing support of world maps (i.e. you can't create any maps that show latitudes > 80°, due to idiosyncrasies in the mapproj package). To a limited extend ...
3
votes
1answer
4k views

Layer map plots on top of one another in R/ggplot2

I'm making a choropleth map in R/ggplot2. I have the colored part working just fine. This code p <- ggplot() + geom_map(data=c_1860, aes(map_id = GISJOIN, fill = AHL002), ...
4
votes
1answer
792 views

How to join data from NHGIS to make choropleth maps in R/ggplot2?

I have downloaded shapefiles of county/state boundaries and census data keyed to those shapefiles from the NHGIS. Both the shapefiles and the census data have a GISJOIN column to be used for merging ...
6
votes
1answer
5k views

Anyway to remove points outlying shape in ggplot2?

I am to map a plot of an area and then plot points over it (given by Easting and Northing). However, I found out that there are certain mistakes in the data entered for Easting and Northing resulting ...
6
votes
0answers
2k views

Using stat_density2d with coord_map in ggplot2 [closed]

In my example I am plotting a shapefile for all England & Wales, however I'm interested in the greater London area. If I allow ggplot to simply default and display the entire shapefile then the ...
3
votes
1answer
3k views

How do I create a heatmap in ggplot?

I'm using R with ggplot2 to generate maps from shapefiles and from data in SQL Server. I'm trying to get to a stage where I can automate a large chunk of the mapping I do. So far this is working well ...
4
votes
1answer
1k views

R: How can I create a polygon from several polygons and a line?

I have some spatial objects that I want to combine, namely three polygons and a line. The ultimate goal is to create a polygon that I can overlay on an area of a map of administrative divisions of the ...

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