Added additional imagery base map option

[Archaejohn]

What has been done to verify that this works as intended?

Tested in Android SDK Emulator

Why is this the best possible solution? Were any other approaches considered?

I attempted to conform to established practices in the codebase. No other approaches have been considered

Are there any risks to merging this code? If so, what are they?

None that I know of, since currently this complies and runs on the emulator.

Do we need any specific form for testing your changes? If so, please attach one.

Change the setting in the menu to OSM SDK and select the new USGS National Map Imagery option for the base map.

[lognaturel]

So cool that USGS makes these available.

Another feature you may be interested in is the ability to specify your own offline map tiles -- getodk/docs#3 (it's available now and just needs to be documented)

[Archaejohn]

Looks interesting! I started to go down the thought of adding mapquest back in however the user would need to specify their own api key, but I am not sure that is in my time budget right now. I work with GIS a lot and if I come up with any other base map sources I may add them in. There is a TON of federal data available but I think it is important not to bog down the UX with too many base map options.

I may look at seeing how we might be able to with overzoom a layer and still get the tiles at the max zoom level of the server. I think I need to poke osmdroid for this one though. I tried one method I thought of with dismal failure :-(...

[lognaturel]

I think it is important not to bog down the UX with too many base map options.

Yes, agreed.

seeing how we might be able to with overzoom a layer and still get the tiles at the max zoom level of the server.

I noticed there was something not quite right about about deep zoom but didn't have the vocab to talk about it. Consider filing an issue so more brains can look into it! Also, this will start to overlap with some work @jknightco is making at improving all the geo questions so best to loop him into the conversation.

[mathieubossaert]

@lognaturel In fact we created a little doc about how to create and use an mbtile offline map. We should translate it for the doc.

[lognaturel]

That's great, @mathieubossaert! I have a first pass at getodk/docs#545, would be great to get your comments and additions. 😊