[postgis-users] radius of buffer parameter issue at st_buffer function...

[ZHAO Gorton]

I am using postgis 1.5 and use the st_buffer function with my spatial queries. I have set the srid to 3308 for my spatial data which the measurement unit is meter, but when I use the st_buffer function and set the radius of buffer in meter. The spatial queries return far more rows than what I expected. The measurement unit of radius of buffer in st_buffer function does not seem to me to be in meter. Instead of using 10 for a radius of 10 meters, I have to use a value of 10*1.7453292519943283E-5 instead. What could be the problem with this st_buffer function? I do not mind to use this value but it is not what postgis documented. It would be appreciated if you could help on this.

Regards,


Gorton ZHAO
Traffic Management

T 02 9319 9431  F  02 9319 2015

http://www.scats.com.au

http://www.rmservices.nsw.gov.au



Roads and Maritime Services

2 Locomotive Street, Eveleigh NSW 2015




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