How to plot shapefile data on a map in R?

How to plot shapefile data on a map in R?

There are several ways to visualize shapefile data on a map in R, I will walk you through a couple of them below. In this tutorial I will use shapefiles to plot spatial data. A shapefile contains all the coordinates and additional data, such as region names.

How to create a circle with radius of 100m?

So what I want to do is : create circles with a 100m radius in the dat_sim, to overlay onto the shapefile dat_ticino_sf or dat_ticino_sp files. For each polygon in the shapefile, calculate how much of that polygon is covered by circles. Return a data frame where each row (polygon) contains the area covered by the circles.

How to create a circle around a point?

Return a data frame where each row (polygon) contains the area covered by the circles. Plot this. Bonus points if this can be done in Simple Features. I think this should do what you want.

How do you plot a population in shapefile?

After adding the population column to the shapefile, I’m going to use the colorRampPalette () function to create HEX color coding in a new column called color . Next, I’ll tell the plot () function to apply this color and to not show the borders.

How to find the length of an object in R?

The length function returns the length of R objects such as vectors, lists, or strings (find a little trick in Example 3).

How to import shapefiles in your using readogr?

To import shapefiles we use the R function readOGR (). readOGR () requires two components: Let’s import our AOI.

How many attributes are there in the shapefile?

Notice that two of our TYPE attribute values consist of two separate words: stone wall and woods road. There are really four unique TYPE values, not six TYPE values. We can use the objectName$attributeName syntax to select a subset of features from a spatial object in R.

How to merge polygon features in a shapefile with many?

Example below of GADM level 2 of Ethiopia has first two rows of the shapefile ID_2 column duplicated (value=1). I’d like sptemp with 79 features combining the first two rows that are the ones with duplicated ID_2.

How to merge and dissolving shapefile in R?

Lets try now another dissolve to obtain the borders of the provinces (NAME_2), using the original shapefile prov.ids <- mun.spdf [ [“ID_2\\] provinces.sp <- gUnionCascaded (mun.spdf, id = prov.ids) # This should plot the borders of the three Spanish provinces Alicante, Castellón y Valencia: par (new = TRUE) plot (provinces.sp)

Can you create a dummy variable in R?

If the data, we want to dummy code in R, is stored in Excel files, check out the post about how to read xlsx files in R. As we sometimes work with datasets with a lot of variables, using the ifelse () approach may not be the best way. For instance, creating dummy variables this way will definitely make the R code harder to read.

Where can I get a shapefile of a country?

A shapefile contains all the coordinates and additional data, such as region names. I’ve downloaded a shapefile of Soutch Africa, because I love this country You can download the shapefile on http://www.gadm.org/download. This file contains all the coordinates which we are going to plot.

How to convert shapefile to raster conversion in R?

Shapefile to raster conversion in R? I have a shapefile downloaded from the worldwildlife.org for the terrestrial ecoregions of the world. The file can be loaded here: http://worldwildlife.org/publications/terrestrial-ecoregions-of-the-world. It comes as a standard shape file and I would like to do two things with it.

Where can I find a raster shape file?

The file can be loaded here: http://worldwildlife.org/publications/terrestrial-ecoregions-of-the-world. It comes as a standard shape file and I would like to do two things with it. First: take the shapefile from my local directory and clip it to an extent of eastern North America (ext= extent (-95, -50, 24, 63))

How to subset shapefiles to GeoJSON in R?

The npm module ogr2ogr is excellent for converting from a shapefile to GeoJSON, however I frequntly find myself needing to select only certain areas of a shapefile. I have been using two libraries in R to achieve this, specifically rgdal and sp.

How to explore the attributes of a shapefile?

When we import a shapefile into R, the readOGR () function automatically stores metadata and attributes associated with the file. To work with vector data in R, we can use the rgdal library. The raster package also allows us to explore metadata using similar commands for both raster and vector files.

How can I extract data from a shapefile?

You can use the @ and $ signs to extract objects from the data. The following examples show you which information is in the shapefile of South Africa.

How to import and export shapfiles in R?

With the rgdal package it is possible to import and export shapfiles with R. The function readOGR can be used to imports shapfiles. If you want to import a file from e.g. ArcGIS the first argument dsn is the path to the folder which contains the shapefile. layer is the name of the shapefile without the file ending (just map and not map.shp ).

How to import and export shapefiles from ArcGIS?

The function readOGR can be used to imports shapfiles. If you want to import a file from e.g. ArcGIS the first argument dsn is the path to the folder which contains the shapefile. layer is the name of the shapefile without the file ending (just map and not map.shp ).

What do arrows mean in a data flow diagram?

Data Flows are referred to by arrows to denote the physical or electronic flow of data. Data Stores are physical or electronic-like XML files denoted by open-ended rectangles. External Entity – An outside process or system that sends or receives data to and from the diagrammed system.

How to plot points by surface temperature in R?

Notice below that i’ve tricked R to plot the points by surface temperature value. Because the range of the data is not large, i’ve tricked R by sending the cex = argument (which specifies the point size) a command which Let’s plot the data. Let’s try to scale the points using the scales library.

How to interpolate spatial data in R-open?

First we will review interpolation using the IDW interpolation method. At the end of this lesson you will be able to: First, we load all the libraries that we plan to use in our code and ensure that the working directory is set.

How to extract and plot spatial data in R?

The default option when we extract data in R is to store all of the raster pixel values in a list. However, when we add a function argument to extract(), R summarizes the data for us. Also note that we are using the sp = TRUE argument to tell R to create a spatialPointsDataFrame. This will allow us to plot our data!

Can a column be added to a shapefile?

But it’s not a problem, because we can add columns to the shapefile. After adding the population column to the shapefile, I’m going to use the colorRampPalette () function to create HEX color coding in a new column called color .

How to get the last rank in R?

NA last option Rank in R has an optional term called na.last and it can have four values $ rank in R – putting NA last – default value > x = c (5,1,4,7,NA,35,25) > rank (x,na.last = TRUE) 3 1 2 4 7 6 5 TRUE is the default value used when this option is emitted.

Is there a way to plot shapefiles in ggplot2?

This is very simple to do with the sf package. Using the included shapefile data for North Carolina, I create a group variable and plot it with either the included plot.sf method or the geom_sf included in the development version of ggplot2. Created on 2018-04-24 by the reprex package (v0.2.0).

How to plot multiple shapefiles in a vector file?

The second is a shapefile containing the location of roads and trails within the field site. The third is a file containing the Harvard Forest Fisher tower location. These latter two we worked with in the Explore Shapefile Attributes & Plot Shapefile Objects by Attribute Value in R tutorial.

How do I change the polygon fill color and border?

For base graphics, col= sets the fill and border= sets the border color. If you want a choropleth map, set col= to a vector of colors, one for each polygon’s data value. Unlike base graphics, the col= option for lattice graphics controls the border color. For no border, set col=NA or col=”transparent”.

How to add a field to a shapefile?

If your data is organized in simple rows and columns, this should not be the case. For future reference, as long as the vector elements in a given list are the same, you can coerce a list into a data.frame by using a call to “matrix” to unfold the list elements (using the “byrow=F” argument) into columns.

How to merge shapefile and CSV file in R?

If you’re working in R then your shapefile and .csv need to be loaded as a data.frame or a data.table. You can use join () to merge them. Do you have any more information about what kind of shapefile you have? I’ve had luck doing the following when I merge shapefiles and data.

How to draw a geospatial map using Ggplot2?

Plotting geospatial data is a common visualisation task, and one that requires specialised tools. Typically the problem can be decomposed into two problems: using one data source to draw a map, and adding metadata from another information source to the map. This chapter will help you tackle both problems.

How to make a map from a shapefile?

In order to read and open the shapefile, I’ll use the maptools package. This simple code already produces the following map: That wasn’t difficult at all! The shapefile includes all kinds of information. I always start to look what kind of information is included.