Comments (5)
Hello,
I've tried to save this tile (right-click, save):
https://geodata.nationaalgeoregister.nl/tiles/service/wmts/opentopo/EPSG:28992/5/16/12.png
and saw that the file is actually a jpeg despite its png extension.
So I tried this url for the tile server:
url <- "https://geodata.nationaalgeoregister.nl/tiles/service/wmts/opentopo/EPSG:28992/{z}/{x}/{y}.jpeg"
but maptiles
does not understand jpeg extension, only jpg and png.
So I've update maptiles
to allow jpeg extension and you can try this (using the dev version of the package):
remotes::install_github('riatelab/maptiles')
library(sf)
#> Linking to GEOS 3.9.0, GDAL 3.2.2, PROJ 7.1.0; sf_use_s2() is TRUE
library(maptiles)
p = st_point(c(328452.9,267552.5))
p = st_sfc(p)
p = st_set_crs(p, 28992)
bb = st_bbox(st_buffer(p, 300000))
url <- "https://geodata.nationaalgeoregister.nl/tiles/service/wmts/opentopo/EPSG:28992/{z}/{x}/{y}.jpeg"
mffp <- list(src="OpenTopo", q=url, sub=NA, cit='')
t <- get_tiles(bb, provider=mffp, crop= T, forceDownload = T, zoom=7)
plot_tiles(t, adjust = TRUE)
Created on 2022-02-15 by the reprex package (v2.0.1)
I have modified point coordinates and zoom level from your original example to show something not on the sea :-)
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Hi, I came to the same conclusion (concerning the jpeg) yesterday evening! Thanks for acting so promptly. Getting the tiles now works, the only thing I can´t figure out is what is going wrong with the projection. Using the following code
library(sf)
library(maptiles)
library(stars)
library(tmap)
p = st_point(c(328452.9,267552.5))
p = st_sfc(p)
p = st_set_crs(p, 28992)
bb = st_bbox(st_buffer(p, 300000))
url <- "https://geodata.nationaalgeoregister.nl/tiles/service/wmts/opentopo/EPSG:28992/{z}/{x}/{y}.jpeg"
mffp <- list(src="OpenTopo", q=url, sub=NA, cit='')
t <- get_tiles(bb, provider=mffp, crop= T, forceDownload = T, zoom=7)
plot_tiles(t, adjust = TRUE)
map <- stars::st_as_stars(t)
tmap_mode("plot")
tm_shape(map) +
tm_rgb() +
tm_graticules(lines=F)
shows that the map is way bigger than it actually should be.
from maptiles.
I suspected something odd with the projection stuff.
I think it has something to do with this part of the url (and the way tiles are delivered): EPSG:28992
Most of tiles providers ask for lon & lat in EPSG:4326 and offer tiles in EPSG:3857 (web mercator) and this projs are actually hardcoded in maptiles
.
Can you direct me to the API documentation just to be sure of what input/output proj are expected?
from maptiles.
I think you're right. this is the KVP WMTS GetCapabilities page. If you ctrl+f and search for opentopo you can see EPSG:28992. Thanks for your help!
from maptiles.
Additionally, here a working example with an interactive tmap (requires dev-version):
remotes::install_github('r-tmap/tmap')
library(tmap)
library(leaflet)
epsg28992 <- leafletCRS(
crsClass = "L.Proj.CRS"
,code = "EPSG:28992"
,proj4def = "+proj=sterea +lat_0=52.15616055555555 +lon_0=5.38763888888889 +k=0.9999079 +x_0=155000 +y_0=463000 +ellps=bessel +towgs84=565.417,50.3319,465.552,-0.398957,0.343988,-1.8774,4.0725 +units=m +no_defs"
,origin=c(-285401.92,903401.92)
,resolutions = c(3251.206502413005,1625.6032512065026,812.8016256032513,406.40081280162565,203.20040640081282,101.60020320040641, 50.800101600203206,25.400050800101603,12.700025400050801,6.350012700025401,3.1750063500127004,1.5875031750063502,0.7937515875031751,0.39687579375158755,0.19843789687579377,0.09921894843789689,0.04960947421894844)
)
url <- "https://geodata.nationaalgeoregister.nl/tiles/service/wmts/opentopo/EPSG:28992/{z}/{x}/{y}.jpeg"
data(World)
tmap_mode("view")
tm_shape(World) +
tm_polygons() +
tm_basemap(NULL) +
tm_view(projection = epsg28992, set.view = c(5.092098,52.093992,4)) +
tm_tiles(server = url) +
tm_mouse_coordinates()
from maptiles.
Related Issues (20)
- SpatExtent argument HOT 1
- consider caching the composed tiles
- Timeout was reached: HOT 2
- Timeout was reached SOLVED
- additional info EPSG28992 tiles projection issue
- tiles look unsharp, even with adjust = TRUE HOT 2
- Use tiles with CRS != EPSG:3857 HOT 1
- plot_tiles doesn't show new tiles HOT 2
- Add alpha channel to png tiles HOT 2
- Typo in get_tiles() example
- Explicit (OGC) WMTS support HOT 5
- Use preferred tile.openstreetmap.org URL
- Update stamen styles (=> stadia)
- Getting error when running example : unable to find an inherited method for function ‘crs’ for signature ‘"character"’ HOT 4
- resolution of fetched tiles HOT 4
- Cannot download tiles in webp format HOT 1
- Add more providers HOT 1
- add tiles providers HOT 8
- Tile resolution HOT 12
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