Struct Dem 

pub struct Dem {
    pub raster: RasterData,
    pub cell_size: f64,
}

Digital Elevation Model wrapping a RasterData grid with a known cell size.

Fields

raster: RasterData

Underlying raster elevation data.

cell_size: f64

Physical size of each square cell (metres).

Implementations

impl Dem

pub fn new(raster: RasterData, cell_size: f64) -> Self

Construct a new Dem from a RasterData and a cell size.

pub fn flow_direction(&self) -> Vec<Vec<u8>>

Compute an 8-direction flow-direction grid (D8 algorithm).

Encoded directions: 1=E, 2=SE, 4=S, 8=SW, 16=W, 32=NW, 64=N, 128=NE.

pub fn flow_accumulation(&self) -> Vec<Vec<f64>>

Compute flow-accumulation grid (number of upstream cells).

pub fn watershed_delineation( &self, outlet: (usize, usize), ) -> Vec<(usize, usize)>

Delineate a watershed upstream of outlet pixel using D8 flow directions.

Returns a list of (row, col) cells belonging to the watershed.

pub fn extract_stream_network(&self, threshold: f64) -> Vec<Vec<(usize, usize)>>

Extract a stream network as connected channel segments.

Cells with flow accumulation ≥ threshold are considered streams. Returns a list of segments, each segment being an ordered list of cells.

Trait Implementations

impl Clone for Dem

fn clone(&self) -> Dem

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Dem

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.