Adding default_assets for MultiBaseReader and STACReader

[mccarthyryanc]

I have a specific use case when using titiler where I can't pass assets to the STACReader methods. As a solution to this, I added an optional default_assets attribute to be used like:

with STACReader(STAC_PATH, default_assets=["green"]) as stac:
    img = stac.tile(71, 102, 8)

PR includes tests and updates to docs.

ref: #720

[vincentsarago]

@mccarthyryanc I'll try to review/merge this PR this week.

Quick question, are you planning to use this with TiTiler? right now this won't work without customizing the Dependencies because the default dependencies expect assets/expression to be set or it will raise a 500 errors. At runtime the dependencies can check if the item as default_assets set so this will be pretty hard to enable dynamic check.

Note: this could be resolved using the Render extension at a collection level

[mccarthyryanc]

Thanks for the review!

Quick question, are you planning to use this with TiTiler? right now this won't work without customizing the Dependencies because the default dependencies expect assets/expression to be set or it will raise a 500 errors. At runtime the dependencies can check if the item as default_assets set so this will be pretty hard to enable dynamic check.

Note: this could be resolved using the Render extension at a collection level

Yes, I'm using this with titiler. I already needed custom dependencies for some other inputs so it was simple enough to add in the default_assets.

[vincentsarago]

@mccarthyryanc thanks for the PR, I've made some edits:

• raise warnings for all the methods (it was implemented only for tile())
• add default_bands to the MultiBandReader

let's hope no one comes with the need of default_expression 😅

I'll wait for your 👍 before merging

[mccarthyryanc]

Awesome! Thanks for the changes @vincentsarago, those all look great!