[postgis-users] Using a buffer with a LineString covering the whole world

[Paul Ramsey]

that's really not a good option. mercator does not preserve
length/distance, so the buffer would end up larger at one end than the
other, and furthermore would not be the expected width, since it would
be built far from the latitude of true scale.

P.

On Wed, Feb 11, 2009 at 8:52 AM, Pavel Iacovlev
<iacovlev.pavel at gmail.com> wrote:
> As an option you can use google mercator projection for the whole world. But
> read carefully docs about it to understand the precision loss.
>
> http://genuchten.blogspot.com/2008/04/srid-stuff-in-postgis.html would be a
> good start.
>
> On Wed, Feb 11, 2009 at 6:26 PM, Matthes Rieke <matthes.rieke.01 at gmail.com>
> wrote:
>>
>> Hi all,
>>
>> I am currently running into this problem: I have a LineString in lat/long
>> coordinates (SRID 4326 - going from USA to france). I now want to create a
>> buffer in meters from this. So the normal way to transfrom the coordinates
>> to a planar CRS, buffering, then transforming back to 4326 does not work
>> (the Line is covering many UTM zones). What would be a reasonable solution
>> for this problem?
>>
>> Thanks and regards,
>> Matthes
>>
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>
>
>
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