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title: "1. The method of delineation"
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  %\VignetteEncoding{UTF-8}
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rcrisp is the first implementation of a spatial morphological method of delineation ([Forgaci, 2018](https://doi.org/10.7480/abe.2018.31)) that considers both the terrain of the river valley and the configuration of the urban fabric, as shown in the diagram below.

<div class="figure" style="text-align: center">
<img src="img/method-diagram.png" alt="Diagram of the method of delineation" width="100%" />
<p class="caption">Method of delineation</p>
</div>

The method consists of the following steps, each explained on this website in a separate article:

1. The **valley** is delineated using a cost distance accumulation analysis on a Digital Elevation Model, as shown in `vignette("valley-delineation")`. The resulting valley edge is used as one of the inputs in the next step.

2. The urban **corridor** surrounding the river is delineated on the street network along a path following road centrelines that is closest to the valley edge, as shown in `vignette("corridor-delineation")`.

3. The delineated corridor is divided into **corridor segments** bounded by the main transversal streets, as shown in `vignette("corridor-segmentation")`.

4. The **river space**, i.e., the space between the river and the first line of buildings is determined, as shown in `vignette("riverspace-delineation")`.