Add heatmap layer about deck.gl

[1chandu]

We will be working on this layer for next major deck.gl release (6.0 or 6.1, currently building GPU aggregation pieces).

[1chandu]

This can be closed once #3384 is merged, remaining issues are tracked here: #3385

[yocontra]

Anyone working on this? Might make time to look into it this weekend if not - the one bundled w/ map-gl has some really major perf issues

[gnavvy]

Hi @contra, we are currently working on some other features and can definitely use some help here :)

[vicapow]

Hey @contra! If you're talking about https://github.com/vicapow/react-map-gl-heatmap-overlay would love to hear more info on the perf issues you're experiencing.

[yocontra]

@vicapow The issue with react-map-gl-heatmap-overlay is:

• location accessor map over dataset not being cached - immutablejs .get() and .getIn() are super costly!
• iterating every data point on every draw for mercator projection

Even with only ~10K items in immutable the framerate is incredibly low and the main thread is locked up consistently.

Doing the projections on the gpu (with this module) solves all of these problems.

Caching the output of mapping locationAccessor over the data set alleviates the major bottleneck and allows you to render ~20K items with a decent framerate, but I still think doing the projections in JS at all is going to be a bottleneck for our case (10M+ data points, trying to render as many as possible @ 60fps).

[jmandel1027]

is this still coming in 7.0.0? a port of @vicapow 's webgl heatmap for both geospatial and identity based systems would be amazing and super relevant to the use case im working through in #2673

[tgorkin]

This will likely not make it in for 7.0 release. I expect this will release in 7.1 or 7.2.

Can I add a request that the elevation of a point be considered, and therefore render the heatmap in 3D?

[1chandu]

@SymbolixAU , it is possible, but can you give more details of your use case?

I don't have a specific use-case in mind yet, but a lot of the data I work with has elevation (e.g. GPS pings along roads), so I thought it might be an interesting component of a heatmap.

nice work!