November 2018
Beginner to intermediate
354 pages
6h 59m
English
Content preview from Hands-On Geospatial Analysis with R and QGIS
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Nearest-neighbor interpolation
We'll then convert this raster data into point data and get the nearest neighbor for each location and assign values to an unobserved point; the values will be those of the nearest neighboring points. This is called nearest-neighbor interpolation.
Let's load the DEM file first:
library(raster)dem = raster("F:/Hands-on-Geospatial-Analysis-Using-R-and-QGIS/Chapter 07/Data/dem.tif") plot(dem, main="Elevation")
Now have a look at the coordinate reference system of this raster screenshot:
dem@crs
We get the following result:
We'll aggregate 4 x 4 cells to one cell for computational purpose (to get more speed):
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