[postgis-tickets] [SCM] PostGIS branch main updated. 3.1.0rc1-358-gccf1cae

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- Log -----------------------------------------------------------------
commit ccf1cae72a34d4ad383f8463d06332185327ac8e
Merge: 8ed39fe 150b346
Author: Paul Ramsey <pramsey at cleverelephant.ca>
Date:   Fri Jul 16 14:02:34 2021 -0700

    Merge branch 'invmindist-fix' of https://github.com/cffk/postgis into main


commit 150b346457f1b7d42cf5f8d88d6d3e569037cbbb
Author: Charles Karney <charles at karney.com>
Date:   Fri Jun 11 14:53:46 2021 -0400

    Fix typo in setting of INVMINDIST.
    
    This fixes an obvious typo since 100nm = 100e-9 m = 1/1.0e7 m.  This
    only affects !defined(PROJ_GEODESIC) code which may not be active any
    more.
    
    However, to go back to the ticket #2168 that generated this INVMINDIST
    hack...
    
    defined(PROJ_GEODESIC) code for geodesics is guaranteed to be symmetric
    in the calculation of distances, i.e., dist(A,B) = dist(B,A).  So it
    would be better to avoid quantizing the distance calculation to fix a
    non-existent problem.
    
    Of course the length of a line string make change if it's reversed (just
    from the properties of floating point addition).  However the hack is
    still ill-advised.  If covers up the problem it most cases, but would
    exacerbate it in a small fraction of cases.
    
    I'm not making this change myself, because I'm not a direct user of
    PostGIS.

diff --git a/postgis/geography_measurement.c b/postgis/geography_measurement.c
index 0d1d388..bea5d9e 100644
--- a/postgis/geography_measurement.c
+++ b/postgis/geography_measurement.c
@@ -45,7 +45,7 @@
 #define INVMINDIST 1.0e8
 #else
 /* round to 100 nm precision */
-#define INVMINDIST 1.0e9
+#define INVMINDIST 1.0e7
 #endif
 
 Datum geography_distance(PG_FUNCTION_ARGS);

-----------------------------------------------------------------------

Summary of changes:
 postgis/geography_measurement.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)


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