[postgis-users] Newbie to postGIS

[Michael Welter]

Hello,

Can anyone tell me why I get this error:

lwline_deserialize: attempt to deserialize a line which is really a 
Invalid type

with this statement:

SELECT 
AsText(MakePolygon(Simplify(MLineFromText('MULTILINESTRING((-105.277943 
39.499826,-105.277316 39.499146),(-105.277943 39.499826,-105.276814 
39.500724),(-105.277316 39.499146,-105.276609 39.498454),(-105.276814 
39.500724,-105.276611 39.501081,-105.276278 39.501365,-105.275958 
39.501489),(-105.276609 39.498454,-105.276243 39.498945,-105.276032 
39.499161,-105.274805 39.499972,-105.274401 39.500162,-105.273858 
39.500229,-105.273437 39.500364,-105.272911 39.500702,-105.272707 
39.500908),(-105.275958 39.501489,-105.275769 39.501311,-105.275471 
39.501257,-105.275226 39.501379,-105.27477 39.501487,-105.274507 
39.501311,-105.274226 39.500973,-105.274121 39.500905,-105.273946 
39.500878,-105.273437 39.501081,-105.273191 39.501108,-105.273034 
39.501068,-105.272707 39.500908))'),0.000001)));

I get the same error with or without the Simplify function.

It works when substituting the ConvexHull function for the MakePolygon 
function.

Must the line segments in a multiline string be in order?

Thanks,
Mike