Retrieve and assemble hydrographic lines around an area

Builds a convex buffer around the input geometry, retrieves hydrographic line features from BDTOPO, normalizes them, and returns a combined sf linestring layer.

Usage

get_hydro_line(x, buffer = 1000)

Arguments

x

An sf object used as the input area.

buffer

numeric; Buffer around x (in meters) used to enlarge

Value

An sf object containing hydrographic line features with four fields:

• TYPE - hydrographic class

  • RUP = Permanent hydrographic line

  • RUI = Intermittent hydrographic line

• NATURE - Original BDTOPO nature field

• NAME - Official hydrographic name (when available)

• OFFSET - Offset information

Details

The function retrieves BDTOPO hydrographic line segments (troncon_hydrographique) within a 1000 m convex buffer around x, assigns the hydrographic types, normalizes the geometries, and returns them as a single combined layer.