topic Re: Finding the area of a irregular polygon (SAS Base) in Graphics Programming https://communities.sas.com/t5/Graphics-Programming/Finding-the-area-of-a-irregular-polygon-SAS-Base/m-p/204007#M7559 <HTML><HEAD></HEAD><BODY><P>This paper may provide a starting point. <A href="http://www.caloxy.com/papers/52-DataX_gis_poster.pdf" title="http://www.caloxy.com/papers/52-DataX_gis_poster.pdf">http://www.caloxy.com/papers/52-DataX_gis_poster.pdf</A></P><P>It has a few pages worth of code to do this and find "interior" points. The code dates from the 80's and doesn't use proc gis or similar.</P><P></P><P>Understanding the code may be a learning exercise.</P></BODY></HTML> Thu, 20 Aug 2015 20:25:09 GMT ballardw 2015-08-20T20:25:09Z Finding the area of a irregular polygon (SAS Base) https://communities.sas.com/t5/Graphics-Programming/Finding-the-area-of-a-irregular-polygon-SAS-Base/m-p/204006#M7558 <HTML><HEAD></HEAD><BODY><P>I have sas/stat and sas foundations but not sas/iml</P><P></P><P>I'm trying to find the area for an irregular polygon. My dataset consists of many points but the example below contains just 8 coordinates.</P><P></P><P>Is there a good algorithm available for doing this? Ideally generalizing it so that it can apply to potentially 100s of points.</P><P></P><P></P><P>data coord;</P><P>input x 1. y 1.;</P><P>datalines;</P><P>14</P><P>31</P><P>53</P><P>87</P><P>79</P><P>58</P><P>47</P><P>25</P><P>run;</P></BODY></HTML> Thu, 20 Aug 2015 19:58:57 GMT https://communities.sas.com/t5/Graphics-Programming/Finding-the-area-of-a-irregular-polygon-SAS-Base/m-p/204006#M7558 brophymj 2015-08-20T19:58:57Z Re: Finding the area of a irregular polygon (SAS Base) https://communities.sas.com/t5/Graphics-Programming/Finding-the-area-of-a-irregular-polygon-SAS-Base/m-p/204007#M7559 <HTML><HEAD></HEAD><BODY><P>This paper may provide a starting point. <A href="http://www.caloxy.com/papers/52-DataX_gis_poster.pdf" title="http://www.caloxy.com/papers/52-DataX_gis_poster.pdf">http://www.caloxy.com/papers/52-DataX_gis_poster.pdf</A></P><P>It has a few pages worth of code to do this and find "interior" points. The code dates from the 80's and doesn't use proc gis or similar.</P><P></P><P>Understanding the code may be a learning exercise.</P></BODY></HTML> Thu, 20 Aug 2015 20:25:09 GMT https://communities.sas.com/t5/Graphics-Programming/Finding-the-area-of-a-irregular-polygon-SAS-Base/m-p/204007#M7559 ballardw 2015-08-20T20:25:09Z Re: Finding the area of a irregular polygon (SAS Base) https://communities.sas.com/t5/Graphics-Programming/Finding-the-area-of-a-irregular-polygon-SAS-Base/m-p/204008#M7560 <HTML><HEAD></HEAD><BODY><P><A href="http://blogs.sas.com/content/graphicallyspeaking/2015/08/24/a-macro-for-polygon-area-and-center/" title="http://blogs.sas.com/content/graphicallyspeaking/2015/08/24/a-macro-for-polygon-area-and-center/">http://blogs.sas.com/content/graphicallyspeaking/2015/08/24/a-macro-for-polygon-area-and-center/</A></P></BODY></HTML> Tue, 25 Aug 2015 15:01:39 GMT https://communities.sas.com/t5/Graphics-Programming/Finding-the-area-of-a-irregular-polygon-SAS-Base/m-p/204008#M7560 Jay54 2015-08-25T15:01:39Z