Site under development — the current data release is archived on Zenodo. Comments on the dataset are welcome in the open discussion at ESSD; anything else, [email protected]

What is upstream of this pixel like?

Shape measures like perimeter or elongation normally have to be computed on demand: delineate the catchment of the point you care about, walk its boundary, then do the arithmetic. Here all sixteen are already computed and stored at the pixel, so getting them is a raster read. That is only possible because every pixel stores a depth-first interval, and both the catchment and its divide follow from those two numbers — which is what makes doing it at every pixel, rather than at a fixed list of outlets, affordable at all.

Try it · basin 8595

Read the sixteen values at a pixel

The attributes exist wherever at least 10 km² drains in — the highlighted pixels below. Click one and the sixteen values stored there are read straight out, alongside the catchment and the geometry they describe.

This site runs on a basic hosting plan with a fixed number of requests a day. If a map stops loading, it is most likely that a lot of people are using it at once — try again in a few minutes. We will raise the budget as the traffic grows. The archived files on Zenodo are never affected.

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Basin 8595 pixels that carry the sixteen attributes
the upstream area those values describe
the divide around it
L∥, the axial length
L⊥ and the bounding box
L∥ = max ∥p − v∥, p ∈ ∂U(v)
Attributes at the selected pixel
Click a pixel on the map. That pixel’s upstream catchment, the divide around it, and the two axes the shape metrics are built from are drawn, and the sixteen stored values are listed.
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