# Spatial Data and GIS - Vector Data

## Maps in R: R Maps Tutorial Using Ggplot

You can use R as a GIS. Learn how to create a map in R using ggplot in this R maps tutorial.

last updated: 10 Jan 2018

## Import and Summarize Tree Height Data and Compare it to Lidar Derived Height in R

It is important to compare differences between tree height measurements made by humans on the ground to those estimated using lidar remote sensing data. Learn how to perform this analysis and calculate error or uncertainty in R.

last updated: 10 Jan 2018

## Extract Raster Values Using Vector Boundaries in R

This lesson reviews how to extract pixels from a raster dataset using a vector boundary. You can use the extracted pixels to calculate mean and max tree height for a study area (in this case a field site where tree heights were measured on the ground. Finally you will compare tree heights derived from lidar data compared to tree height measured by humans on the ground.

last updated: 10 Jan 2018

## GIS in R: Plot Spatial Data and Create Custom Legends in R

In this lesson you break down the steps required to create a custom legend for spatial data in R. You learn about 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: 10 Jan 2018

## GIS in R: How to Reproject Vector Data in Different Coordinate Reference Systems (crs) in R

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

last updated: 10 Jan 2018

## GIS in R: Understand EPSG, WKT and other CRS definition styles

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

last updated: 10 Jan 2018

## GIS With R: Projected vs Geographic Coordinate Reference Systems

Geographic coordinate reference systems are often used to make maps of the world. Projected coordinate reference systems are use to optimize spatial analysis for a region. Learn about WGS84 and UTM Coordinate Reference Systems as used in R.

last updated: 10 Jan 2018

## Coordinate Reference System and Spatial Projection

Coordinate reference systems are used to convert locations on the earth which is round, to a two dimensional (flat) map. Learn about the differences between coordinate reference systems.

last updated: 10 Jan 2018

## GIS in R: shp, shx and dbf + prj - The Files That Make up a Shapefile

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: 10 Jan 2018

## GIS in R: Intro to Vector Format Spatial Data - Points, Lines and Polygons

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

last updated: 10 Jan 2018

## Layer a Raster Dataset Over a Hillshade Using R Baseplot to Create a Beautiful Basemap That Represents Topography

This lesson covers how to overlay raster data on a hillshade in R using baseplot and layer opacity arguments.

last updated: 10 Jan 2018