Modified the way area of a ring is calculated to allow for more precision
Modified the way area of a ring is calculated to allow for more precision

ljwolf/pysal,lanselin/pysal,hasecbinusr/pysal,lixun910/pysal,TaylorOshan/pysal,lixun910/pysal,sjsrey/pysal,sjsrey/pysal_core,ljwolf/pysal_core,ljwolf/pysal,ljwolf/pysal_core,pastephens/pysal,ljwolf/pysal_core,hasecbinusr/pysal,jlaura/pysal,jlaura/pysal,sjsrey/pysal_core,hasecbinusr/pysal,pedrovma/pysal,pysal/pysal,TaylorOshan/pysal,lixun910/pysal,jlaura/pysal,TaylorOshan/pysal,pastephens/pysal,ljwolf/pysal,sjsrey/pysal_core,pastephens/pysal,weikang9009/pysal