So far, we have covered operations to transform a vector layer to a raster and vice versa. The third operation involving vector layers and rasters, and the focus of this final section, is the extraction of raster values according to vector layers. We are often interested in reducing or summarizing raster data using point, line, or polygon features, which is when this operation comes in handy. For example, we may wish to calculate the elevation profile covered by a GPS track (raster-to-line extraction) or the average NDVI of a given forest (raster to polygon extraction). In this section, we will see two examples involving extraction by points and extraction by polygons.
Learning R for Geospatial Analysis
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Learning R for Geospatial Analysis
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Overview of this book
Table of Contents (18 chapters)
Learning R for Geospatial Analysis
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Free Chapter
The R Environment
Working with Vectors and Time Series
Working with Tables
Working with Rasters
Working with Points, Lines, and Polygons
Modifying Rasters and Analyzing Raster Time Series
Combining Vector and Raster Datasets
Spatial Interpolation of Point Data
Advanced Visualization of Spatial Data
External Datasets Used in Examples
Cited References
Index
Customer Reviews