[postgis-tickets] [PostGIS] #2965: ST_Distance, use_spheroid default

[PostGIS]

#2965: ST_Distance, use_spheroid default
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 Reporter:  gitai                      |       Owner:  pramsey      
     Type:  defect                     |      Status:  new          
 Priority:  critical                   |   Milestone:  PostGIS 2.1.5
Component:  postgis                    |     Version:  2.1.x        
 Keywords:  ST_Distance, use_spheroid  |  
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Comment(by gitai):

 I'm new to postgis, not gis ... and no your wrong, the function behaves
 differently as result of an overload *as well as* an implicit default
 parameter - which makes it a tricky interface.

 Furthermore, your explanation does not seem consistent with how ST_DWithin
 works:

 select ST_Distance(ST_SetSRID(ST_MakePoint(-73.9662500, 40.7834300),
 4326), ST_SetSRID(ST_MakePoint(-74.1960983, 40.739418), 4326));

 -- output: 0.234024137979163

 select ST_Distance(ST_SetSRID(ST_MakePoint(-73.9662500, 40.7834300),
 4326)::geography, ST_SetSRID(ST_MakePoint(-74.1960983, 40.739418),
 4326)::geography);

 -- output: 20013.836017253

 select ST_DWithin(ST_SetSRID(ST_MakePoint(-73.9662500, 40.7834300), 4326),
 ST_SetSRID(ST_MakePoint(-73.9662500, 40.7834300), 4326), 20 * 1000)

 -- output: t

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Ticket URL: <http://trac.osgeo.org/postgis/ticket/2965#comment:8>
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