## Create custom maps with ggplot in R - GIS in R

In this lesson we break down the steps to create a map in R using ggplot.

*last updated: 18 Sep 2017*

In this lesson we break down the steps to create a map in R using ggplot.

*last updated: 18 Sep 2017*

In this lesson we break down the steps required to create a custom legend for spatial data in R. We discuss creating unique symbols per category, customizing colors and placing your legend outside of the plot using the xpd argument combined with x,y placement and margin settings.

*last updated: 18 Sep 2017*

In this lesson we cover how to reproject a vector dataset using the spTransform() function in R.

*last updated: 18 Sep 2017*

This lesson discusses ways that coordinate reference system data are stored including proj4, well known text (wkt) and EPSG codes.

*last updated: 18 Sep 2017*

This tutorial describes key differences between projected and geographic coordinate reference systems (CRSs). We focus on the Universal Trans Mercator (UTM) projected Coordinate Reference which divides the globe into zones to optimize projection results in each zone and WGS84 which is a geographic (latitude and longitude) CRS. It also briefly introduces the concept of a datum.

*last updated: 18 Sep 2017*

This lesson introduces what a coordinate reference system is. We will use the R programming language to explore and reproject data into geographic and projected CRSs.

*last updated: 18 Sep 2017*

This lesson reviews the core files that are required to use a shapefile including: shp, shx and dbf. It also covers the .prj format which is used to define the coordinate reference system (CRS) of the data.

*last updated: 18 Sep 2017*

This lesson introduces what vector data are and how to open vector data stored in shapefile format in R.

*last updated: 18 Sep 2017*