Don't use transparent as "no data" color (because Cesium-drawn empty circles are nearly unclickable)

[meh9]

When adding tabular data to Cesium containing points and some lines do not have a value for whatever column is currently being visualised, then these points are drawn "empty", i.e. no colour fill. Unfortunately this makes the point very hard to click since it appears you have to click the line of the circle in order to bring up the data for that point.

The Test entry in this CSV shows the issue once dragndropped onto NM:

Some data, Place, Lat, Lon, Data1, Data2
1, NICTA,-35.2817828,149.1248208, Some more data from the CSV, And some more
4, Parkwood Road Substation,-35.2195879,148.996752, Some more data from the CSV, And some more
5, Cotter Dam,-35.3202023,148.9398087, Some more data from the CSV, And some more
,Test,-35.29,149, Some more data from the CSV, And some more

[stevage]

Closely related issue: points in GeoJSON files with marker icons are very hard to click on as well - you have to click on the very base of the signpost (not the sign itself).

[kring]

The difficulty in clicking marker icons is caused by CesiumGS/cesium#2894.

[meh9]

This has been highlighted by GA testing of AREMI. It would be nice to have this fixed, as it is a problem we just live with at the moment.

The best way to test is to turn on Electricity Inf. -> Generation -> Current Power Generation -> All in AREMI and play around clicking inside and on the edge of the unfilled circles:

http://nationalmap.gov.au/renewables/#share=0fR0dV

[stevage]

Ok, so let's reframe this issue as "Don't leave circles unfilled, even when there is no data". Then it becomes a lot simpler. At the least, we could use a very low opacity colour.

[meh9]

I do like the look of having the circles empty, as that really says "no value" to me. If we can retain that look, or something like it using a a nearly transparent colour (or white?) would be great.

[RacingTadpole]

FYI, #1250 added a nullColor option to tableStyle: "defaults to a dark blue. This colour is used to display null values (but it does not appear on the legend; we should add it). It is also used to colour points when no variable is selected."

[RacingTadpole]

I believe this is fixed now by the addition of nullColor, replaceWithNullValues and replaceWithZeroValues.
At least the sample csv file you give above @meh9 works now, because by default missing numerical values are now shown as if zero (which makes the AREMI electricity data work nicely); you can change this to make them show as the nullColor (defaulting to black) by setting replaceWithNullValues and replaceWithZeroValues.