Image of Australia as a map, its extent, and map projection.
Format
A list with an array, a numeric vector, and a character vector:
- img
image array with dimension 921,1025,3 - three slices Red, Green, Blue
- extent
the geographic extent of the array, in metres
- crs
the map projection of the geographic extent of
img
Details
This dataset exists to demonstrate the full pattern: write img to PNG,
texture it with [quad_texture()] using extent, and transform the mesh
vertices with the crs - the image itself is never resampled.
(The image is web Mercator, aka 'EPSG:3857'. We've kept the proj string because it's the easiest way to modify a projection.)
Provenance
Copyright Commonwealth of Australia (Geoscience Australia) 2016. Creative Commons Attribution 4.0 International Licence.
The image is named 'Australian Topographic Base Map (Web Mercator)' and is from the a Geoscience Australia Web Map Tile Service (WMTS).
Code to obtain the image is in 'data-raw/ga_topo.R' at https://github.com/hypertidy/textures using the wmts package https://github.com/mdsumner/wmts.