How can style parameters be changed dynamically?

[cardinalgeo]

Hi all,

With django-large-image, styling can be changed dynamically using the request url (e.g., http://localhost:8000/api/image-file/${imageId}/data/thumbnail.png?band=3&palette=viridis&min=50&max=250, given in the example here). Is there a similar way to update styling with trame-leaflet (e.g., with a dropdown)? I've tried adding parameters to the url (e.g., "/tile/{z}/{x}/{y}.png?palette=twilight_shifted") but without success.

Also, am I comparing apples to oranges? Should this question instead be posted in large-image?

Thanks!

[cardinalgeo]

Another thought is that, as django-large-image is built on large-image, which I'm already using with trame-leaflet, the former could be used to serve tiles instead?

[cardinalgeo]

Alternatively, might this be accomplished in large-image by setting up a custom "style function" that is applied upon serving the tile (e.g., here)?

[cardinalgeo]

Update: @banesullivan had some good suggestions on this topic. Once I implement them, I'll update everyone here and close the issue!

[banesullivan]

@cardinalgeo, definitely update this after our discussion on this topic.

Some takeaways though:

• This is an issue better suited for large-image than this repository as its about tile serving and building endpoints to serve those tiles with different styles
• Use large-image's style API: https://girder.github.io/large_image/tilesource_options.html#style
• When creating a tile serving endpoint like demo'd in this example, the browser will cache the tile endpoints response, so changing the style server-side may not reflect on the browser. You need to invalidate the tile URL -- IMO, the best way is to just pass the style in the URL parameters
• I hope to one day make a trame-large-image package to make all of this simpler with trame

[cardinalgeo]

Thanks for the comments @banesullivan — will take them into account when posting my solution :)