local downloaded tiles

[virux84]

Hi, I'm trying to develop a R app that use the leaflet package but with local downloaded tiles.

Using this code:

tilesDir <- 'file:///c:/MapQuest/{z}/{x}/{y}.png' leaflet() %>% addTiles(urlTemplate =tilesDir)

But it not shows anything. How Can I use local tiles? Thank you

[jcheng5]

Are you creating a Shiny app? Or a stand-alone HTML file?

[virux84]

I tried with both of them, with no succes Il 12/ott/2015 11:23 PM, "Joe Cheng" notifications@github.com ha scritto:

Are you creating a Shiny app? Or a stand-alone HTML file?

— Reply to this email directly or view it on GitHub https://github.com/rstudio/leaflet/issues/194#issuecomment-147526408.

[gherardovarando]

I successfully use local tiles (they are not download but created by me, the structure is something like: "map/tiles/{z}/{x}/{y}.png" ) inside a Shiny app. I just use:
m <- leaflet() m <- addTiles(m,urlTemplate = "map/tiles/{z}/{x}/{y}.png")

and the directory map/ is inside www/ I was not able to use it outside a Shiny app.

[virux84]

Please could you explain me step by step how to set up my shiny app? Also the complete path file? Thank you very much Il 13/ott/2015 02:56 PM, "Gherardo Varando" notifications@github.com ha scritto:

I successfully use local tiles (they are not download but created by me, the structure is something like: "map/tiles/{z}/{x}/{y}.png" ) inside a Shiny app. I just use:

m <- leaflet() m <- addTiles(m,urlTemplate = "map/tiles/{z}/{x}/{y}.png")

and the directory map/ is inside www/ I was not able to use it outside a Shiny app.

— Reply to this email directly or view it on GitHub https://github.com/rstudio/leaflet/issues/194#issuecomment-147706702.

[gherardovarando]

I wrote a simple app to show it https://github.com/gherardovarando/examples I created a map from a wikipedia image (https://en.wikipedia.org/wiki/History_of_Boston#/media/File:Boston_area_colonial_map.jpg)

The map is a bit distorted because the method I use to produce the map directory is supposed to work with square images, so it fit the initial image to a square.

Example on shinyapps: https://gherardo.shinyapps.io/exampleLocalTiles

[virux84]

thank you very much. It works great :-)

[cabanana]

Has someone an idea why it's not working outside a shiny app?

[gherardovarando]

the problem I think is that, if you are not in a shiny app there is no server able to answer the request of map's tiles. I succeed using local tiles in this way:

1) go to the directory where you have the tiles and start for example an HTTP server with python's SimpleHttpServer : in a terminal: python -m SimpleHTTPServer 8000

2) in R: tilesUrl <- "http://localhost:8000/tiles/{z}/{x}/{y}.png" leaflet() %>% addTiles(urlTemplate = tilesUrl, option=list(continuousWorld=TRUE, tileSize="256",minZoom="0",maxZoom="5") )

obviously the tilesUrl depends on the structure of your local tiles.

In the terminal you can actually see the server answering the tiles requests.

[dimin-axa]

@gherardovarando Thanks for the example app, it was exactly what I wanted to do However the leaflet appears grey as soon as I subset your tiles by mines (which are extracted from a raster) But it works when I host them on an external server: any idea why it fails in local?

[edit] Nevermind, it works perfectly. I just forget to set the "tms" option to TRUE within the addTiles: addTiles(urlTemplate = "tiles_test/{z}/{x}/{y}.png", option = tileOptions(tms = TRUE))