[postgis-tickets] [PostGIS] #3715: ST_Segmentize(geography) fails over the poles

PostGIS trac at osgeo.org
Tue Feb 21 07:14:56 PST 2017 

#3715: ST_Segmentize(geography) fails over the poles
----------------------+---------------------------
  Reporter:  pramsey  |      Owner:  pramsey
      Type:  defect   |     Status:  new
  Priority:  medium   |  Milestone:  PostGIS 2.4.0
 Component:  postgis  |    Version:  trunk
Resolution:           |   Keywords:
----------------------+---------------------------

Comment (by robe):

 Paul,

 You sure you updated your PostGIS?

 Just tasted with my 2.4.0, which is at:

 POSTGIS="2.4.0dev r15313" GEOS="3.6.1-CAPI-1.10.1 r4317" PROJ="Rel. 4.9.1,
 04 March 2015" GDAL="GDAL 2.1.3, released 2017/20/01 GDAL_DATA not found"
 LIBXML="2.7.8" LIBJSON="0.12" LIBPROTOBUF="1.2.1" RASTER




 {{{
 SELECT st_astext(st_segmentize('linestring(-90 -80, 90 -80)'::geography,
 10000));

 }}}

 Yields:


 {{{
 LINESTRING(-90 -80,-90 -80.0896860986547,-90 -80.1793721973094,-90
 -80.2690582959641,-90 -80.3587443946189,-90 -80.4484304932736,-90
 -80.5381165919283,-90 -80.6278026905829,-90 -80.7174887892376,-90
 -80.8071748878924,-90 -80.8968609865471,-90 -80.9865470852018,-90
 -81.0762331838565,-90 -81.1659192825112,-90 -81.2556053811659,-90
 -81.3452914798206,-90 -81.4349775784754,-90 -81.5246636771301,-90
 -81.6143497757848,-90 -81.7040358744395,-90 -81.7937219730943,-90
 -81.883408071749,-90 -81.9730941704037,-90 -82.0627802690584,-90
 -82.1524663677131,-90 -82.2421524663678,-90 -82.3318385650226,-90
 -82.4215246636773,-90 -82.5112107623321,-90 -82.6008968609868,-90
 -82.6905829596415,-90 -82.7802690582962,-90 -82.869955156951,-90
 -82.9596412556057,-90 -83.0493273542604,-90 -83.1390134529152,-90
 -83.2286995515699,-90 -83.3183856502246,-90 -83.4080717488793,-90
 -83.497757847534,-90 -83.5874439461888,-90 -83.6771300448435,-90
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 -87.141641338955,62.9688119090345 -87.0533647247009,63.2634327864018
 -86.9650055322018,63.5413923926389 -86.8765707696623,63.8040544033041
 -86.788066679133,64.0526388611431 -86.6994988377763,64.2882404470905
 -86.6108722435809,64.5118440541854 -86.5221913882251,64.7243381139095
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 -85.9002021213457,65.9597329542782 -85.8112051205714,66.1069067989679
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 -83.401241328596,68.5991069585201 -83.3118234737875,68.657447127531
 -83.2223985621975,68.714274787074 -83.1329668695182,68.7696481640254
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 -80.1791299766537,70.0386474608192 -80.0895660726507,90 -80)
 }}}

--
Ticket URL: <https://trac.osgeo.org/postgis/ticket/3715#comment:2>
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