[postgis-users] meters to degrees

Mike Toews mwtoews at gmail.com
Mon Mar 7 03:28:19 PST 2011

```You are using EPSG:3044, correct? http://spatialreference.org/ref/epsg/3044/

<http://spatialreference.org/ref/epsg/3044/>This projection has units of
metres. ST_DWithin and related functions use the same units of length as
defined in the projection, which in this case is metres, not degrees. You
may need to elaborate with an example.

-Mike

On 7 March 2011 23:41, michal nagy <lachim1989 at gmail.com> wrote:

> Well, it sitll does not solve my problem. As I said I am using
> geometry(planar) with SRID 3044, where units are degrees, therefore when
> using st_dwithin will still take input in degrees.
>
> 2011/3/7 Paragon Corporation <lr at pcorp.us>
>
>> http://www.postgis.org/documentation/manual-1.5SVN/ST_DWithin.html
>>
>> We cover this topic in detail in the first chapter of our book which is a
>>
>> http://www.postgis.us/chapter_01
>>
>> Leo and Regina
>>
>>  ------------------------------
>> *From:* postgis-users-bounces at postgis.refractions.net [mailto:
>> postgis-users-bounces at postgis.refractions.net] *On Behalf Of *michal nagy
>> *Sent:* Monday, March 07, 2011 2:29 AM
>> *To:* postgis-users at postgis.refractions.net
>> *Subject:* [postgis-users] meters to degrees
>>
>>
>>   Hello everyone,
>>
>> I am new to Postgres and PostGIS. I have encountered one problem, that I
>> can not deal with.I have table with various points that have SRID=3044,
>> which should be UTM zone including Jutland. I have created function to
>> loop through all points in table and check if they are within given
>> radius(using geometry and function st_point_inside_circle). Now to the
>> problem, for some reason st_point_inside_circle takes radius in degrees,
>> which is very inconvenient for me. I would really need to  change to
>> metres. If anyone has a suggestion, pls let me know.
>>
>> Thank you for help
>>
>> Michal
>>
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>>
>
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