Remove non-imagery from index

[pnorman]

Fixes #119
Fixes #66
Fixes #15

[bhousel]

LGTM 👍

[simonpoole]

Ahemm the layer is quite popular and further there are quite a few non-imagery layers that you missed ... in general the clean up is silly, because the editor maintainers will then simply add them back again manually which seems to make the whole project rather pointless.

[pnorman]

It's not about non-imagery, it's about OSM-derived layers.

[simonpoole]

Of the 26 global layers 18 are derived from OSM. While theoretically
naturally the information contained in the layers could be re-created
from OSM data, in practical terms providing it via a layer is the
most-cost effective and likely only practical solution.

Not to mention that there are dozen of non-imagery layers at a regional level.

Am 07.01.2016 um 17:37 schrieb Paul Norman:

It's not about non-imagery, it's about OSM-derived layers.

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#124 (comment).

[tyrasd]

I think @simonpoole has a point here, and a solution like simonpoole/osm-layer-index@5472443 seems to be much more elegant (iD could choose to exclude all or most non-imagery layers while another editor may want to use all of them).

[jfirebaugh]

I agree with @tyrasd and @simonpoole -- the intent of this repository was to be an inclusive collection of layers useful to editors, not to be exclusively aerial imagery sources. This and this move us back toward editors each having their own custom lists of imagery. 😢