Multiple Ring Buffer displays 2.5 Km polyline  within 30 metres ring?

SebastianSalazar

Hello folks.

In Arc Map 10.1 I have I polyline with distances (2.659542 m) and length (0.00266 km) fields. Those fields were calculated with geomtric calculator.

I am tryin a Multiple Ring Buffer Tool with 30, 50 and 100 metres of distance. At the end, the tool shows 3 rings, however,

2.5 Km polyline is located within the 30 metres ring (see littel blue polyline in inner ring). I am really confused. Why 30 metres ring is larger than polyline length?

The polyline is in WGS 1984 World Mercator.

Can you give an idea(s) to fix this problem?

MRB.jpg

IanMurray

Sebastian Salazar wrote: Hello folks. In Arc Map 10.1 I have I polyline with distances (2.659542 m) and length (0.00266 km) fields. Those fields were calculated with geomtric calculator. I am tryin a Multiple Ring Buffer Tool with 30, 50 and 100 metres of distance. At the end, the tool shows 3 rings, however, 2.5 Km polyline is located within the 30 metres ring (see littel blue polyline in inner ring). I am really confused. Why 30 metres ring is larger than polyline length? The polyline is in WGS 1984 World Mercator. Can you give an idea(s) to fix this problem?

I think you may have answered your own question.  Accoding to your original post, you line is only 2.659m,  not kilometers(or as you mentioned .00266km).  I'm assuming you are only working with a single line, not multiple lines anytime you buffer a feature, the resulting buffer by definition should contain your input feature(unless you are using a negative value buffer).  So yes, your 2.659m polyline should be within your 30m radius buffer.