\BeginKnitrBlock{rmdnote}<div class="rmdnote">Take care when using the word 'vector' as it can have two meanings in this book:
geographic vector data and the `vector` class (note the `monospace` font) in R.
The former is a data model, the latter is an R class just like `data.frame` and `matrix`.
Still, there is a link between the two: the spatial coordinates which are at the heart of the geographic vector data model can be represented in R using `vector` objects.</div>\EndKnitrBlock{rmdnote}