Fix Elevation API and extend Elevation Preview

[okimiko]

I added a Info field to the elevation preview, which queries the elevation api with coordinates.

During the implementation I stumbled over various issues:

• pmtile coordinates weren't working (just tiles)
• pixel calculation was not working
• swapped lat / long in coordinate input
• use of static tileSize is not a good idea
• the limitation by zoom is not needed for coordinate api

[acalcutt]

Instead of adding baseUrl do you think you can use {{public_url}} like the javascript links in the header

[okimiko]

Yes :)

[acalcutt]

It's ok, you probably got the baseUrl thing from the contour test I posted :-) I didn't think of that then..haha

[okimiko]

Correct, it's still in my PR to your PR ;-)

[acalcutt]

I tested this and notice two issue.

1.) I saw a lot of no data returns, especially around Australia when it was off center to the left of the map. possible when passing the antimeridian

2.) I noticed this issue from before where the terrain window seems to have a white line on the left side.

I changed
#map { position:absolute; top:0; bottom:0; width:100%; }
to
#map {position:absolute;top:0;left:0;right:0;bottom:0;}
in the data.tmpl and it seemed to fix it.

[okimiko]

I tested this and notice two issue.

1.) I saw a lot of no data returns, especially around Australia when it was off center to the left of the map. possible when passing the antimeridian

2.) I noticed this issue from before where the terrain window seems to have a white line on the left side.

I changed #map { position:absolute; top:0; bottom:0; width:100%; } to #map {position:absolute;top:0;left:0;right:0;bottom:0;} in the data.tmpl and it seemed to fix it.

1. Correct, the bounds check was hit there. I removed it and the coordinate conversion works (and the elevation api) works as expected.
2. Fixed, too.

[acalcutt]

looks good to me now