@MicheleTobias @GeospatialUCD

Using R for Climate Raster Data Extraction

Michele Tobias, PhD

CalGIS – Apr. 14-16, 2014 – Monterey, CA

@MicheleTobias @GeospatialUCD

ObjectiveSample 1,416 climate rasters (x 3 datasets) with a point shapefile

… as quickly as possible.

@MicheleTobias @GeospatialUCD

Raster FilesPRISM Dataset – Oregon State University

Monthly climate rasters

(also available: daily)

1895 – present

Datasets: Precipitation

Temperature (Min, Max, & Mean)

http://prism.oregonstate.edu/

@MicheleTobias @GeospatialUCD

Ras

ter

File

s

January 1953, Precipitation

@MicheleTobias @GeospatialUCD

Poi

nt L

ocat

ions

@MicheleTobias @GeospatialUCD

Processing OptionsQGIS – Point Sampling Tool

ArcGIS – Extract by Points Tool

GRASS – v.what.rast

R – Extract Command

Probably lots of other ways...

@MicheleTobias @GeospatialUCD

@MicheleTobias @GeospatialUCD

@MicheleTobias @GeospatialUCD

Res

ults

@MicheleTobias @GeospatialUCD

Questions?Michele Tobias

mmtobias@ucdavis.edu

geospatial.ucdavis.edu