Michael Sumner

helpers for image rendering

2

we want something like ```R im

https://github.com/stactools-packages/cop-dem

we can now do ```R im

this for example, a url created by {mapSpain}, is a perfectly good dsn on its own ```R #custom_wms

accidentially did ``` elevation(source = sstfiles()$vrt_dsn) ``` lol, maybe put a limit on the number of bands and/or dsn (haven't figure out details yet)

https://gist.github.com/mdsumner/0bc3945355b38cfbadcea45a85bbf213 SRTM 15Plus, GL1, GL3, COP30, NASADEM

provide helpers for native crop for sources

1

need some helpers to get the exact extent for a given crop, native to the sources (currently GEBCO 2019 and NASADEM) This will be important when we can divert to...

we need to do some VRT stuff with oisst, with the point being that a WarpedVRT can go through the warper just one time, and then we can sub out...

problem with opentopo source NASADEM

2

the issue is the NODATA value is-32768, but then the zeros that fill each tile override the GEBCO source so, we might set NODATA to 0 ... it'll ruin some...

there are two ways this could be useful, processing tiles at a time or just an entire dataset - I think only the latter is relevant here see https://github.com/hypertidy/vapour/issues/84#issuecomment-1162692384