Geospatial Use Cases
R Analytical Environment
Demonstrates techniques from three R packages for reading, displaying, and writing ESRI Shapefiles
Demonstrates creation of Keyhole Markup Language (KML) files for vector ESRI Shape Files and raster GeoTIFF files, enabling their display in GoogleEarth / Google Maps
Two examples demonstrate the use of the R environment to process data sets from GPS devices: Read/Translate/Display/Write ASCII Point Files.
Associate points in a data set with the polygons in a second data set that surround them
Compute a matrix of shortest-path distances between spatially-referenced points in a region
Use R geospatial classes to assign MODIS Image temperature values to georeferenced point locations.
Overlay a regularly-spaced grid of points on the Bailey's Ecoregions map of the United States, and extract the Bailey's region number underneath each point.
Demonstrates computation of Centroid (Center of Gravity) points for a polygon data set stored in an ESRI Shape File
Given a point data set AND a polygon data set whose members surround the point set members: 1) Compute the polygon areas; 2) assign each point its 'bounding polygon'; 3) calculate the convex hull bounding the point data set; 4) generate Region of Interest (ROI) polygons surrounding each point data set member
Explore the relationships of spatially coincident point and polygon data layers using R geospatial tools
Input two geocoded point data sets from .csv files into R workspace, then assign to one data set the closest point locations from the other
Aggregate spatial data polygons into larger polygons along with their descriptive attributes, using a spatial primary key
Join and perform relational queries on multiple attribute tables. Compute summary statistics using the joined tables.
Generate various types of publication-quality maps using standard R graphics tools
A comprehensive introduction to the art, science, and application of map projections
A step-by-step tutorial, including a complete, downloadable example, demonstrating the creation and use of an R package that calls a C function performing simple matrix calculations
ESRI ArcMap GIS
Change the Latitude/Longitude display units and extract single-pixel values using the mouse
Create a Point Shape File attribute file by performing a series of Spatial Join operations
Use Polygon Shape Files to perform raster data set clipping operations
Use the mouse to select and write a subset of existing ESRI Shape File to new Shapefile