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Variation in Coverage Analysis with different methods of ArcMap

Question asked by zahirkhan on Aug 23, 2011
â??Variation in Coverage Analysis with different methods of ArcMapâ?�. Please find attached the testing shape files with process/methods implemented (images attached).

Following table depicts the variation in buffer analysis based on attached sample shape files.
S.No. SITES SETTLEMENT COVERED BUFFER(KM) RESULT METHOD SOFTWARE
1 447 11947 2028 2.5 KM 2028 Select By Location ArcMap
2 447 11947 3383 2.5 KM 3383 Buffer Then Intersect ArcMap
3 447 11947 2202 2.5 KM 2202 Buffer Then Clip ArcMap

We found variation in settlement selection while opting different buffer function. We used above mentioned ArcGIS functions while creating the buffer followed by selection of settlements. Please provide information on reason of variation and which method will be ideal for extracting the desired results.

Look forward to your early response on the above problem.

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