Polylines over the North Pole (ArcMap 10)
When drawing polylines in ArcMap 10 in an Albers Equal Area Conic projection over the north pole (in the center), the lines become distorted and jagged. Is there any way to correct this and simulate the normal "great circle" lines? I'm attempting to illustrate flight plans between North America and northern Eurasia.
Mapping Center Answer:
I am not sure how your data were generated (which may be the source of the problem), but you may want to reconstruct your lines using the XY to Line geoprocessing tool with an origin point, a destination point and specifying geodesic as your line type. This will create new line features between your points following a great circle path.
You might also check out our Creating Radial Flow Maps blog entry on Mapping Center that discussed the construction of these types of maps.
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