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Color ramp for Maize Farming Niche does not distinguish Out from NODATA. #19

Open tmcphillips opened 6 years ago

tmcphillips commented 6 years ago

The value of the Maize Farming Niche variable in the PaleoCAR data set is either 1 or 0 at each point, corresponding to 'In' the niche and 'Out' of the niche respectively. The current color ramp assigns the color green to In, and transparent to Out. As a result, Out points are colored identically to points outside the coverage of the PaleoCAR data set, the boundary of which is not obvious. For example, when zoomed in near Las Vegas one might wonder if the Moapa River Indian Reservation (center of map below) is known to be outside the reconstructed niche. There is no green overlay there, but is that area covered by the data set at all?

image

If one switches to the GDD variable, it is clear that at least that variable does cover the reservation, so if one knows that all of the PaleoCAR variables cover the same area, one can conclude that the Maize Farming Niche variable has the value zero in that area. But this is not obvious.

image

We need to use two (visible) colors to represent the two possible values of the Maize Farming Niche variable.

tmcphillips commented 6 years ago

There are now two colors, corresponding to In and Out of the maize farming niche, but the two colors likely are not ideal with respect to red-green color blindness:

image

bocinsky commented 6 years ago

Ha, no, I’d say not. Perhaps something from one of the diverging color scales on Color Brewer? #5ab4ac for in, and #d8b365 for out?

On Jun 26, 2018, at 6:05 PM, Timothy McPhillips notifications@github.com wrote:

There are now two colors, corresponding to In and Out of the maize farming niche, but the two colors likely are not ideal with respect to red-green color blindness:

https://user-images.githubusercontent.com/3218259/41945404-b8ae1c12-7961-11e8-8941-86cc1ac71e8d.png — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub https://github.com/openskope/Datasets/issues/19#issuecomment-400499531, or mute the thread https://github.com/notifications/unsubscribe-auth/AH8pM6ihuLXuIRbXEkoaOQkR-RtARmhhks5uAsxZgaJpZM4UuhOV.

jterstriep commented 6 years ago

I've implemented Kyle's suggested colors. Personally, I prefer the old colors which were from Color Brewer.