[GRASS-dev] [GRASS GIS] #3356: v.to.db: incorrect area calculations in lat-long location

GRASS GIS trac at osgeo.org
Sun Jun 4 15:06:51 PDT 2017


#3356: v.to.db: incorrect area calculations in lat-long location
--------------------------+-----------------------------------
  Reporter:  mlennert     |      Owner:  grass-dev@…
      Type:  defect       |     Status:  new
  Priority:  normal       |  Milestone:  7.4.0
 Component:  Vector       |    Version:  svn-trunk
Resolution:               |   Keywords:  v.to.db area lat-long
       CPU:  Unspecified  |   Platform:  Unspecified
--------------------------+-----------------------------------

Comment (by annakrat):

 I fixed the rendering issue in r71163 and r71164. But the area computation
 problem must be somewhere in
 [https://grass.osgeo.org/programming7/area__poly1_8c.html#af6f1f53bacc34249be98006c95369695
 G_ellipsoid_polygon_area], probably related to very small numbers, but I
 couldn't pinpoint the problem. There is something specific about this
 polygon, when I draw a similar one, it gives more reasonable results.

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Ticket URL: <https://trac.osgeo.org/grass/ticket/3356#comment:5>
GRASS GIS <https://grass.osgeo.org>



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