Integrate Geo Plots (sedona) with Leaflet

[okennedy]

What pain point is this feature intended to address? Please describe. At present, Vizier's GeoPlots render to a static image:

• There is no background, no context whatsoever.
• Sedona's raster plotting capabilities are (currently) only good for histogram/heatmap style map visualizations. This isn't surprising, as shapes/markers/etc... are far more effectively rendered as vector data. However, we don't have a way to plot vector data (without involving python).

Describe the solution you'd like Add Leaflet as a dependency and use it to render GeoPlots. Suggested UI is to have multiple rows, and on each row:

• Pick a display type (Point, Polygons, Histogram, etc...)
• Pick a dataset
• Pick a geo-typed column
• Select metadata (if appropriate): e.g., attribute to display in a name label, attribute to display in a pop-up details view, attribute to use as an icon. (bonus points if we provide an icon library... e.g., MDI? Emoji?)

Additionally, global settings:

• Initial coordinates/zoom
• Leaflet map data source (suggest pre-populating a bunch and then providing a properties option to allow users to specify more)

Finally, there should be an option to allow users to download the map specification (e.g., as an HTML file)

Describe alternatives you've considered

• The python cell allows you to render to leaflet, but involves a lot of code, and this is a fairly standard pattern
• These can be generated out-of-band, but again, this is a sufficiently standard pattern

[okennedy]

Still TODO:

• [ ] Access to multiple datasets
• [x] Popups and mouseovers for vector data
• [ ] Raster data heatmaps

[okennedy]

Some screenshots:

[okennedy]

Supporting a single cell with multiple datasets + column references is going to be annoying in the current web UI (which assumes a single dataset attribute). My current thought is to add an override for List/Record parameters (column selectors in lists default to referencing dataset selectors in the current row, if one exists).

Current plan:

• Modify ControlGroup.js to call Engine.js 's getSelectedDataset on the row-based argument list to get the "selected" dataset.
• That... should be everything

[okennedy]

[okennedy]

The v1.2 branch has a fairly complete implementation of leaflet, as outlined above. A few remaining tasks:

• [ ] Add a "density plot" option that adds a ST_Buffer step
• [ ] Sedona doesn't support filled polygon rendering. We need a way to replace polygons with fill points and/or enhance ST_Render.
• [ ] Embedding PNGs in leaflet doesn't seem to be working fully yet and requires a little debugging.

[okennedy]

Migrating Version 1.2 issues to 2.1