Discover tiles and coverage

This example uses BlueTopo source tiles from the National Bathymetric Source catalog. The build verifies the downloaded assets and records their source metadata.

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.

Coverage is geometric tile-index coverage rather than a data-quality measure.

Example area

Selected tiles

tiles <- bluertopo_tiles(
  real_aoi,
  resolution = "native",
  coverage = "warn",
  quiet = TRUE
)

Tile ID	Resolution (m)	UTM zone	Delivery date	Intersection area (m²)	Tile intersected (%)	Selection rank	Selection	Coverage fallback	GeoTIFF URL	RAT URL
BH4XC5FK	4	18	2026-06-25 10:51:01	7508785	14.221	1	Native	No	noaa-ocs-nationalbathymetry-pds.s3.amazonaws.com/BlueTopo/BH4XC5FK/BlueTopo_BH4XC5FK_20260624.tiff	noaa-ocs-nationalbathymetry-pds.s3.amazonaws.com/BlueTopo/BH4XC5FK/BlueTopo_BH4XC5FK_20260624.tiff.aux.xml
BH4XD5FK	4	18	2026-06-25 10:50:52	11263177	21.331	2	Native	No	noaa-ocs-nationalbathymetry-pds.s3.amazonaws.com/BlueTopo/BH4XD5FK/BlueTopo_BH4XD5FK_20260624.tiff	noaa-ocs-nationalbathymetry-pds.s3.amazonaws.com/BlueTopo/BH4XD5FK/BlueTopo_BH4XD5FK_20260624.tiff.aux.xml

Coverage diagnostics

Published coverage (%)	Selected coverage (%)	AOI intersected (%)	Target coverage (%)	Target met	Coverage type
100	100	100	100	Yes	geometric tile-index coverage

AOI and selected footprints

BlueTopo tile coverage for the New York Harbor example area.

Coverage fractions

Coverage fractions for the selected New York Harbor tiles.

The selected tile table includes shortened GeoTIFF and RAT URLs from the current catalog records.