Create an HTML file that displays a tile preview using Leaflet.
tile_viewer(tiles, zoom, width = NULL, height = NULL, georef = TRUE,
...)
character, directory where tiles are stored.
character, zoom levels full range. Example format: "3-7"
.
NULL
(default) for geospatial map tiles. The original image width in pixels for non-geographic, simple CRS tiles.
NULL
(default) for geospatial map tiles. The original image height in pixels for non-geographic, simple CRS tiles.
logical, for non-geographic tiles only. If viewer = TRUE
, then the Leaflet widget in preview.html
will add map markers with coordinate labels on mouse click to assist with georeferencing of non-geographic tiles.
additional optional arguments include format = "tms"
if necessary, and lng
and lat
for setting the view longitude and latitude. These three arguments only apply to geographic tiles. Viewer centering is 0, 0
by default.
nothing is returned, but a file is written to disk.
This function creates a file preview.html
adjacent to the tiles
base directory.
When loaded in the browser, this file displays map tiles from the adjacent folder.
For example, if tiles are stored in project/tiles
, this function creates project/preview.html
.
By default, tile
creates this file. The only reasons to call tile_viewer
directly after producing map tiles are:
(1) if viewer = FALSE
was set in the call to tile
,
(2) if tile
was called multiple times, e.g., for different batches of zoom levels, and thus the most recent call did not use the full zoom range,
or (3) preview.html
was deleted for some other reason.
If calling this function directly, ensure that the min and max zoom, and original image pixel dimensions if applicable, match the generated tiles.
These arguments are passed to tile_viewer
automatically when called within tile
, based on the source file provided to tile
.
# NOT RUN {
tile_viewer(file.path(tempdir(), "tiles"), "3-7") # requires an existing tile set
# }
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