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Added reference to scientific paper

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Gael-de-Sailly
2021-07-28 19:31:16 +02:00
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terrainlib_lua/rivermapper.lua
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-- rivermapper.lua
-- This file provide functions to construct the river tree from an elevation model.
-- Based on a research paper:
--
-- Cordonnier, G., Bovy, B., and Braun, J.:
-- A versatile, linear complexity algorithm for flow routing in topographies with depressions,
-- Earth Surf. Dynam., 7, 549–562, https://doi.org/10.5194/esurf-7-549-2019, 2019.
--
-- Big thanks to them for releasing this paper under a free license ! :)
-- The algorithm here makes use of most of the paper's concepts, including the Planar Boruvka algorithm.
-- Only flow_local and accumulate_flow are custom algorithms.
local function flow_local_semirandom(plist)
local sum = 0
for i=1, #plist do