Getting tiles for plugin usage

[Dirk Stöcker]

On Thu, 17 Oct 2019, Jiri Vlasak wrote:

> there was Missing Maps hackathon this weekend in Pilsen, Czech Republic. One of
> the tasks we were working on was click building feature [1] -- building plot
> based on mouse click to the middle of the building.
>
> I am interested in getting background imagery in effective way. Currently, the
> following steps are used:
> 1. Mouse listener knows the coordinates.
> 2. Coordinates are recomputed to TileXY.
> 3. New tiles around the mouse click are created in array (9 of them).
> 4. Based on Tile URL, Images are downloaded and used for algorithm.
>
> I feel like downloading Tiles multiple times is not effective.

I'd recommend the meachnism already included in JOSM, e.g. the Tile loader 
classes which also do caching.

> Also, I think that we found a bug in Tile.getUrl() -- for Esri imagery, it
> returns:
>
> https://{switch:services,server}.arcgisonline.com/arcgis/rest/services/World_Imagery/MapServer/tile/{zoom}/{y}/{x}/17/79468/63554.png
>
> Instead of proper URL. And I have the same issues with Maxar.

Seems you use a templated tile url in a non-templated environment:

See here for a description of the templated format:
https://josm.openstreetmap.de/wiki/Maps#TileMapServicesTMS

Ciao
-- 
http://www.dstoecker.eu/ (PGP key available)