11
$\begingroup$

Bug introduced in 10.1 or earlier and fixed in 11.0.0

I've moved to V.10.4 and proceed with Russian map (the aim is to geoplot regional distributions of some values). Notice most eastern Russian region - Chukotka. Chukotka, unlike other entities, comprises of two data pieces. Now my concern is GeoProjection. Some of them reflect both parts, but others - just western half.

Sample of popular GeoProjections to try.

list = {"Albers", "Bonne", "Equirectangular", "LambertAzimuthal", "Mercator",
   "Mollweide", "Orthographic", "Robinson", "Sinusoidal", "WinkelTripel"}

I've taken just two - {"LambertAzimuthal", "Albers"} to get: enter image description here

Code to try with more GeoProjections:

GeoListPlot[Entity["AdministrativeDivision", {"Chukotka", "Russia"}], 
   GeoProjection -> #, ImageSize -> 200] & /@list

The question is 'why'? Is there a kind of regularity backed in GeoProjection specifics or just a bug also?

|improve this question
$\endgroup$
  • $\begingroup$ Added the bugs tag per note I added below. $\endgroup$ – rcollyer Mar 8 '16 at 14:46
5
$\begingroup$

I think this is how the Albers projection method is supposed to work.

Albers bifurcates the world. So when you look at the map, you examine one side of the bifurcation, because of the location of Chukotka.

Modifying the GeoGraphics to zoom out using, 

GeoRange-> "World"

We see that the location is visible in both instances

LambertAzimuthal:

num1

Albers (both sides visible): enter image description here

|improve this answer
$\endgroup$
  • $\begingroup$ en.wikipedia.org/wiki/Albers_projection $\endgroup$ – Peter Roberge Dec 6 '15 at 20:48
  • $\begingroup$ in GeoListPlot[Entity["AdministrativeDivision", {"Chukotka", "Russia"}], GeoProjection -> #, ImageSize -> 200, GeoRange -> "World"] & /@ list almost all of projections make both sides visible. Take an example of Mercator... $\endgroup$ – garej Dec 7 '15 at 11:57
  • 2
    $\begingroup$ Also, adding the option GeoCenter -> Entity["AdministrativeDivision", {"Chukotka", "Russia"}] shifts the split to 180 degrees from Chukotka, but it is still split ... Adding the bugs tag. $\endgroup$ – rcollyer Mar 8 '16 at 14:43

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.