projections to calculate perimeter (small areas)

[joycemaia]

Hello,

Someone let me know what the best projection to calculate the perimeter of polygons. I need to calculate the perimeter (border) of all countries of the world. They are grouped by continent.

Must also calculate the area of the cities of these countries.

I used the projection Albers for each continent, but realized that for small areas it returns 0.

thank you all

[curtvprice]

ArcGIS now supports area calculations in geodesic, i.e. referenced to the globe. Seems to me this would be a good approach for your application.

The Calculate Field tool supports this syntax to do this on the fly with GCS (decimal degree) data:

!shape.geodesicArea@squarekilometers! 

Calculate Field examples—Help | ArcGIS for Desktop

[SepheFox]

I tried that, and it said disabled.