Simultaneously sample hundreds of PRISM climate rasters at several point locations to build a multi-year spatial temporal dataset.

1. @MicheleTobias @GeospatialUCD
Using R for Climate
Raster Data Extraction
Michele Tobias, PhD
CalGIS – Apr. 14-16, 2014 – Monterey, CA

2. @MicheleTobias @GeospatialUCD
Objective
Sample 1,416 climate rasters (x 3 datasets) with a
point shapefile
… as quickly as possible.

3. @MicheleTobias @GeospatialUCD
Raster Files
PRISM Dataset – Oregon State University
Monthly climate rasters
(also available: daily)
1895 – present
Datasets: Precipitation
Temperature (Min, Max, & Mean)
http://prism.oregonstate.edu/

4. @MicheleTobias @GeospatialUCD
RasterFiles
January 1953, Precipitation

5. @MicheleTobias @GeospatialUCD
PointLocations

6. @MicheleTobias @GeospatialUCD
Processing Options
QGIS – Point Sampling Tool
ArcGIS – Extract by Points Tool
GRASS – v.what.rast
R – Extract Command
Probably lots of other ways...

7. @MicheleTobias @GeospatialUCD

8. @MicheleTobias @GeospatialUCD

9. @MicheleTobias @GeospatialUCD
Results

10. @MicheleTobias @GeospatialUCD
Questions?
Michele Tobias
mmtobias@ucdavis.edu
geospatial.ucdavis.edu