Re: Angle

>
>
> Eduardo Luís Garcia Escovar escreveu:
>> Ezequias Rodrigues da Rocha escreveu:
>>> marco vieira escreveu:
>>>> Ezequias:
>>>>  Look at postgis documentation. azimuth() returns radians, not
>>>> degrees. You must divide by pi rad and multiply by 180 degrees to
>>>> obtain 124,9 degrees. Make sure your azimuth is 143,9 by manual
>>>> calculation using start and end points (make sure you are using the
>>>> same start and end points).
>>>> Regards.
>>>> --
>>>> Marco Vieira
>>>> +55 21 9499-6800
>>>> e-mail: maovieira@... <mailto:maovieira@...>  
>>> Marco,
>>>
>>> I did the following:
>>>
>>> DesiredDegree = 180 - ColumnInRad /PI * 1 rad
>>>
>>> Whre 1 rad = 57.29577951
>>>
>>>
>>> Some features works someothers dont.
>>> :-) :-(
>>>
>>> Regards
>>> Ezequias
>>> _______________________________________________
>>> postgis-users mailing list
>>> postgis-users@...
>>> http://postgis.refractions.net/mailman/listinfo/postgis-users
>> Ezequias,
>>
>> You should have done like Marco said:
>>
>> DesiredDegree = ColumnInRad/pi( )*180
>>
>> Remember, this result is the azimuth (angle from the north, i.e.,
>> from the y axis, clockwise).
>>
>> Hope this helps,
>> Eduardo
>> _______________________________________________
>> postgis-users mailing list
>> postgis-users@...
>> http://postgis.refractions.net/mailman/listinfo/postgis-users
>>
> Thank you Eduardo,
>
> Could you see for yourself.
>
> My feature is this one:
>
> MULTILINESTRING ((290635.73828125 9108941.88085938, 290635.94921875
> 9108941.77929688, 290636.2890625 9108940.7109375, 290636.51953125
> 9108918.06054688, 290636.509765625 9108917.55078125, 290636.119140625
> 9108916.06054688, 290635.279296875 9108914.69921875, 290635.146484375
> 9108914.5703125))
>
>
> The angle my Desktop GIS application says is (OpenJUMP): *91.76
> degrees* (from up to down)
>
> The Azimuth generated by Postgis is:  3.16325843263936
>
> The angle applying this formula (you suggested):  *181.241357699403
> degrees
> *
>
> So what is wrong ?
>
>
> Regards ...