[Community] Creating with Shapely a circle with a meters specified radius

[Christian Espinoza]

circle = Point(1,1).buffer(1)

I'm creating a circle of 1x1 and with a radius of 1 unit...

How can I create a circle using decimal coordinates for the point and

circle = Point(-20.212446,-70.150183).buffer(?)

Thanks in advance.
Christian.
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[Oleksandr Huziy]

It works for me. But this circle is a polygon...

Post by Christian Espinoza

circle = Point(-20.212446,-70.150183).buffer(500)

Cheers
--
Oleksandr (Sasha) Huziy


2013/1/10 Christian Espinoza <chespinoza at gmail.com>

Post by Christian Espinoza

circle = Point(1,1).buffer(1)

I'm creating a circle of 1x1 and with a radius of 1 unit...
How can I create a circle using decimal coordinates for the point and

circle = Point(-20.212446,-70.150183).buffer(?)

Thanks in advance.
Christian.
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[Stefano Costa]

Post by Oleksandr Huziy
It works for me. But this circle is a polygon...

circle = Point(-20.212446,-70.150183).buffer(500)

This is unavoidable, as circles and arcs are not part of OGC simple
features so they are approximated by polygons. See

http://toblerity.github.com/shapely/manual.html#object.buffer

for more details on the "resolution" parameter and how it affects the
results of the buffer operation.

Best regards
steko

[Oliver Tonnhofer]

Post by Oleksandr Huziy
It works for me. But this circle is a polygon...

circle = Point(-20.212446,-70.150183).buffer(500)

I think Christian wants a buffer of 500 meters around the lat/long point (-20.212446,-70.150183) which is not really possible without transforming the point to a projected SRS.