[postgis-tickets] [PostGIS] #5243: ST_Minkowski offset/translation issue or user problem?
PostGIS
trac at osgeo.org
Sat Sep 17 11:47:50 PDT 2022
#5243: ST_Minkowski offset/translation issue or user problem?
----------------------+---------------------------
Reporter: osgeoap | Owner: pramsey
Type: defect | Status: new
Priority: medium | Milestone: PostGIS 3.3.2
Component: postgis | Version: 3.3.x
Resolution: | Keywords:
----------------------+---------------------------
Description changed by osgeoap:
Old description:
> Testing the ST_MinkowskiSum is producing an unexepected translated
> position
> {{{
> for the geometry.
>
> oid |extname
> |extowner|extnamespace|extrelocatable|extversion|extconfig|extc
> -------+--------------+--------+------------+--------------+----------+---------+----
> 13745|plpgsql | 10| 11|false |1.0
> |NULL |NULL
> 79944|postgis | 10| 2200|false |3.2.0
> |{80254} |{"WH
> 80982|mobilitydb | 10| 2200|false |1.1.0
> |NULL |NULL
> 3694605|postgis_sfcgal| 10| 2200|true |3.2.0
> |NULL |NULL
>
>
> WITH T(id,trip) as (
> SELECT 1,setsrid(tgeompoint '[Point(1000
> 1000)@2012-02-01T00:01:01, Point(1020 1010)@2012-02-01T00:01:02,
> Point(1040 1020)@2012-02-01T00:01:03]',3857)
> union all SELECT 2,setsrid(tgeompoint '[Point(1100
> 1000)@2012-02-01T00:01:05, Point(1120 1010)@2012-02-01T00:01:06,
> Point(1110 1020)@2012-02-01T00:01:08]',3857)
> union all SELECT 3,setsrid(tgeompoint '[Point(1200
> 1000)@2012-02-01T00:01:10, Point(1140 1010)@2012-02-01T00:01:20,
> Point(1160 1020)@2012-02-01T00:01:40]',3857)
> )
> select
> ST_AsEWKT(ST_Force2D(t1.trip::geometry)) as wkt_t1geom,
> ST_AsEWKT(ST_Force2D(t2.trip::geometry)) as wkt_t2geom,
> ST_AsEWKT(ST_MinkowskiSum(ST_Force2D(transform(t1.trip,3857)::geometry),
> ST_Buffer(ST_Force2D(transform(t1.trip,3857)::geometry),10)))
> --ST_AsEWKT(ST_MinkowskiSum( transform(t1.trip,3857)::geometry,
> transform(t2.trip,3857)::geometry ) as wkt_mink
> FROM T t1, T t2
> where t1.id < t2.id
>
> wkt_t1geom |wkt_t2geom
> |st_asewkt
> |
> ---------------------------------------------------+---------------------------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
> SRID=3857;LINESTRING(1000 1000,1040 1020)
> |SRID=3857;LINESTRING(1100 1000,1120 1010,1110
> 1020)|SRID=3857;MULTIPOLYGON(((1990.0251579118735
> 1999.2911097990932,1990.3551193231879
> 1997.358735770496,1991.0557280900007
> 1995.5278640450006,1992.1000602103095
> 1993.8688539962527,1993.4479825863987
> 1992.445460450043,1995.0476953172788 1991.3123836221034,1996|
> SRID=3857;LINESTRING(1000 1000,1040 1020)
> |SRID=3857;LINESTRING(1200 1000,1140 1010,1160
> 1020)|SRID=3857;MULTIPOLYGON(((1990.0251579118735
> 1999.2911097990932,1990.3551193231879
> 1997.358735770496,1991.0557280900007
> 1995.5278640450006,1992.1000602103095
> 1993.8688539962527,1993.4479825863987
> 1992.445460450043,1995.0476953172788 1991.3123836221034,1996|
> SRID=3857;LINESTRING(1100 1000,1120 1010,1110
> 1020)|SRID=3857;LINESTRING(1200 1000,1140 1010,1160
> 1020)|SRID=3857;MULTIPOLYGON(((2190.0251579118735
> 1999.2911097990932,2190.355119323188 1997.358735770496,2191.055728090001
> 1995.5278640450006,2192.1000602103095
> 1993.8688539962527,2193.4479825863987
> 1992.445460450043,2195.0476953172792 1991.3123836221034,2196.8|
> }}}
New description:
Testing the ST_MinkowskiSum is producing an unexepected translated
position
{{{
for the geometry. Is this expected?
oid |extname
|extowner|extnamespace|extrelocatable|extversion|extconfig|extc
-------+--------------+--------+------------+--------------+----------+---------+----
13745|plpgsql | 10| 11|false |1.0
|NULL |NULL
79944|postgis | 10| 2200|false |3.2.0
|{80254} |{"WH
80982|mobilitydb | 10| 2200|false |1.1.0
|NULL |NULL
3694605|postgis_sfcgal| 10| 2200|true |3.2.0
|NULL |NULL
WITH T(id,trip) as (
SELECT 1,setsrid(tgeompoint '[Point(1000
1000)@2012-02-01T00:01:01, Point(1020 1010)@2012-02-01T00:01:02,
Point(1040 1020)@2012-02-01T00:01:03]',3857)
union all SELECT 2,setsrid(tgeompoint '[Point(1100
1000)@2012-02-01T00:01:05, Point(1120 1010)@2012-02-01T00:01:06,
Point(1110 1020)@2012-02-01T00:01:08]',3857)
union all SELECT 3,setsrid(tgeompoint '[Point(1200
1000)@2012-02-01T00:01:10, Point(1140 1010)@2012-02-01T00:01:20,
Point(1160 1020)@2012-02-01T00:01:40]',3857)
)
select
ST_AsEWKT(ST_Force2D(t1.trip::geometry)) as wkt_t1geom,
ST_AsEWKT(ST_Force2D(t2.trip::geometry)) as wkt_t2geom,
ST_AsEWKT(ST_MinkowskiSum(ST_Force2D(transform(t1.trip,3857)::geometry),
ST_Buffer(ST_Force2D(transform(t1.trip,3857)::geometry),10)))
--ST_AsEWKT(ST_MinkowskiSum( transform(t1.trip,3857)::geometry,
transform(t2.trip,3857)::geometry ) as wkt_mink
FROM T t1, T t2
where t1.id < t2.id
wkt_t1geom |wkt_t2geom
|st_asewkt
|
---------------------------------------------------+---------------------------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
SRID=3857;LINESTRING(1000 1000,1040 1020)
|SRID=3857;LINESTRING(1100 1000,1120 1010,1110
1020)|SRID=3857;MULTIPOLYGON(((1990.0251579118735
1999.2911097990932,1990.3551193231879 1997.358735770496,1991.0557280900007
1995.5278640450006,1992.1000602103095
1993.8688539962527,1993.4479825863987 1992.445460450043,1995.0476953172788
1991.3123836221034,1996|
SRID=3857;LINESTRING(1000 1000,1040 1020)
|SRID=3857;LINESTRING(1200 1000,1140 1010,1160
1020)|SRID=3857;MULTIPOLYGON(((1990.0251579118735
1999.2911097990932,1990.3551193231879 1997.358735770496,1991.0557280900007
1995.5278640450006,1992.1000602103095
1993.8688539962527,1993.4479825863987 1992.445460450043,1995.0476953172788
1991.3123836221034,1996|
SRID=3857;LINESTRING(1100 1000,1120 1010,1110
1020)|SRID=3857;LINESTRING(1200 1000,1140 1010,1160
1020)|SRID=3857;MULTIPOLYGON(((2190.0251579118735
1999.2911097990932,2190.355119323188 1997.358735770496,2191.055728090001
1995.5278640450006,2192.1000602103095
1993.8688539962527,2193.4479825863987 1992.445460450043,2195.0476953172792
1991.3123836221034,2196.8|
}}}
--
--
Ticket URL: <https://trac.osgeo.org/postgis/ticket/5243#comment:4>
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