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Extract elevation with terra

In CRAN or offline builds, network-dependent chunks are not evaluated.

This example uses BlueTopo tiles covering New York Harbor. The workflow demonstrates tile discovery, checksum-verified asset retrieval, and file-backed raster access with terra. Raster Attribute Table (RAT) sidecars are retained with the source GeoTIFF assets.

bluertopo() returns terra objects and, with details = TRUE, exposes selected tiles, downloads, query metadata, provenance, and coverage diagnostics. Normal native extraction does not intentionally resample.

Example area

Extract elevation

result <- bluertopo(
  real_aoi,
  layers = "elevation",
  resolution = "native",
  coverage = "fill",
  details = TRUE,
  progress = FALSE,
  quiet = TRUE
)

Object summary

File-backed sources

Coverage

Provenance

Elevation preview

When native source grids differ, the result can be a SpatRasterCollection. Each member can still be file-backed by verified original assets.

These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.