[postgis-devel] [PostGIS] #412: Improve coordinate formatting for ST_IsValidReason

[PostGIS]

#412: Improve coordinate formatting for ST_IsValidReason
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 Reporter:  mwtoews  |       Owner:  pramsey
     Type:  defect   |      Status:  new    
 Priority:  medium   |   Milestone:         
Component:  postgis  |     Version:  1.5.X  
 Keywords:           |  
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 A message from ST_IsValidReason(geometry) shows the message:
 {{{
 Self-intersection[523991 6.5222e+06]
 }}}
 to describe a point with Easting/Northing coordinates. What I find odd is
 the mixed conventional numeric and exponential forms.

 I [still] can't find the source code for this, but I'm certain there is a
 "%g %g" formatting code somewhere in there. Although %g is usually a nice
 formatter, it is unfortunate that it happens to change to exponential
 format numbers >=1e+06, which is the range of many projected (i.g., UTM)
 coordinates (particularly northern ones). [Note, this is probably
 compiler/platform dependent.]

 To make consistent formatting of these coordinates across platforms, and
 to make it show projected coordinates nicely, I suggest using the
 formatting code: "%.7g %.7g"

 This will use exponential form for numbers >=1e+07, which most earth-based
 Easting/Northing coordinates fall within.

-- 
Ticket URL: <http://trac.osgeo.org/postgis/ticket/412>
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