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
#194 (comment).

[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
#194 (comment).

[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))