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Fisheye-Distorted Hospital–RACF Connections (sf)

conn_fish.Rd

An example LINESTRING layer showing hospital–RACF transfer routes after applying a Focus–Glue–Context (FGC) fisheye warp. It demonstrates how line geometries can be spatially distorted in sync with polygon layers to visualize flow patterns within the magnified focus zone.

Usage

conn_fish

Format

An sf object with:

weight

Numeric, representing transfer magnitude or connection strength.

geometry

LINESTRING geometries in projected CRS (EPSG:3111).

Source

Prepared in data-raw/gen-data.R from transfers_coded.csv and the make_connections() function.

Details

Built from hospital–RACF coordinate pairs in data-raw/transfers_coded.csv using:

  1. connection creation via make_connections() to form LINESTRINGs,

  2. projection to VicGrid94 (EPSG:3111),

  3. distance-based filtering to keep only sources within r_in = 0.34 of the focus point (cx = 145.0, cy = -37.8),

  4. fisheye transformation using sf_fisheye() with r_in = 0.428, r_out = 0.429, and zoom_factor = 1.

The resulting object aligns spatially with vic_fish, allowing co-visualization of regional flow intensity within the distorted focus region.

See also

sf_fisheye(), vic_fish

Examples

library(sf)
#> Linking to GEOS 3.12.1, GDAL 3.8.4, PROJ 9.4.0; sf_use_s2() is TRUE
plot(st_geometry(vic_fish), col = "grey95", border = "grey70")
plot(st_geometry(conn_fish), add = TRUE, col = "black", lwd = 1)