Series.GeoProjectionType (Excel)
Specifies the geography projection type for the specified series within the chart group. Possible return values are xlGeoProjectionTypeAlbers - Use the Albers map projection, xlGeoProjectionTypeAutomatic - Heuristically choose best map projection, xlGeoProjectionTypeMercator - Use the Mercator map projection, xlGeoProjectionTypeMiller - Use the Miller map projection, xlGeoProjectionTypeRobinson - Use the Robinson map projection.
ActiveChart.FullSeriesCollection(1).GeoProjectionType = xlGeoProjectionTypeAlbers