How do I construct a LINESTRING by aggregating Points (ST_MakeLine) in MariaDB?
Let's say I have a table with 3 points,
CREATE TABLE foo ( id int PRIMARY KEY, geog point );
INSERT INTO foo (id, geog) VALUES
( 1, Point(0,0) ),
( 2, Point(1,1) ),
( 3, Point(2,2) );
How can I construct a LINESTRING with those three points in those three different rows. The resulting WKT should be LINESTRING( 0 0, 1 1, 2 2 )?
PostGIS does this with a Spatial Aggregate called ST_MakeLine
SELECT ST_MakeLine(geog)
FROM foo
ORDER BY id;
mariadb spatial
asked 38 mins ago
Evan CarrollEvan Carroll
31.6k966214
add a comment |
Let's say I have a table with 3 points,
CREATE TABLE foo ( id int PRIMARY KEY, geog point );
INSERT INTO foo (id, geog) VALUES
( 1, Point(0,0) ),
( 2, Point(1,1) ),
( 3, Point(2,2) );
How can I construct a LINESTRING with those three points in those three different rows. The resulting WKT should be LINESTRING( 0 0, 1 1, 2 2 )?
PostGIS does this with a Spatial Aggregate called ST_MakeLine
SELECT ST_MakeLine(geog)
FROM foo
ORDER BY id;
mariadb spatial
asked 38 mins ago
Evan CarrollEvan Carroll
31.6k966214
add a comment |
Let's say I have a table with 3 points,
CREATE TABLE foo ( id int PRIMARY KEY, geog point );
INSERT INTO foo (id, geog) VALUES
( 1, Point(0,0) ),
( 2, Point(1,1) ),
( 3, Point(2,2) );
How can I construct a LINESTRING with those three points in those three different rows. The resulting WKT should be LINESTRING( 0 0, 1 1, 2 2 )?
PostGIS does this with a Spatial Aggregate called ST_MakeLine
SELECT ST_MakeLine(geog)
FROM foo
ORDER BY id;
mariadb spatial
asked 38 mins ago
Evan CarrollEvan Carroll
31.6k966214
Let's say I have a table with 3 points,
CREATE TABLE foo ( id int PRIMARY KEY, geog point );
INSERT INTO foo (id, geog) VALUES
( 1, Point(0,0) ),
( 2, Point(1,1) ),
( 3, Point(2,2) );
How can I construct a LINESTRING with those three points in those three different rows. The resulting WKT should be LINESTRING( 0 0, 1 1, 2 2 )?
PostGIS does this with a Spatial Aggregate called ST_MakeLine
SELECT ST_MakeLine(geog)
FROM foo
ORDER BY id;
mariadb spatial
mariadb spatial
asked 38 mins ago
Evan CarrollEvan Carroll
31.6k966214
asked 38 mins ago
Evan CarrollEvan Carroll
31.6k966214
edited 20 mins ago
Evan Carroll
asked 38 mins ago
Evan CarrollEvan Carroll
31.6k966214
asked 38 mins ago
Evan CarrollEvan Carroll
31.6k966214
asked 38 mins ago
Evan CarrollEvan Carroll
31.6k966214
31.6k966214
add a comment |
add a comment |
1 Answer
1
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votes
Because MariaDB (and MySQL) lack all spatial aggregates, the only method is currently to create the WKT, and force MySQL to parse that WKT.
SELECT CONCAT(
'LINESTRING (',
GROUP_CONCAT(CONCAT(ST_X(geog),' ',ST_Y(geog)) SEPARATOR ' '),
')'
)
FROM foo
ORDER BY id;
-- returns LINESTRING (0 0 1 1 2 2)
The inside part
GROUP_CONCAT(CONCAT(ST_X(geog),' ',ST_Y(geog)) SEPARATOR ' ')
Creates the point list, and then we just wrap that in LINESTRING ( $pointlist )
answered 24 mins ago
Evan CarrollEvan Carroll
31.6k966214
add a comment |
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1 Answer
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votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
Because MariaDB (and MySQL) lack all spatial aggregates, the only method is currently to create the WKT, and force MySQL to parse that WKT.
SELECT CONCAT(
'LINESTRING (',
GROUP_CONCAT(CONCAT(ST_X(geog),' ',ST_Y(geog)) SEPARATOR ' '),
')'
)
FROM foo
ORDER BY id;
-- returns LINESTRING (0 0 1 1 2 2)
The inside part
GROUP_CONCAT(CONCAT(ST_X(geog),' ',ST_Y(geog)) SEPARATOR ' ')
Creates the point list, and then we just wrap that in LINESTRING ( $pointlist )
answered 24 mins ago
Evan CarrollEvan Carroll
31.6k966214
add a comment |
Because MariaDB (and MySQL) lack all spatial aggregates, the only method is currently to create the WKT, and force MySQL to parse that WKT.
SELECT CONCAT(
'LINESTRING (',
GROUP_CONCAT(CONCAT(ST_X(geog),' ',ST_Y(geog)) SEPARATOR ' '),
')'
)
FROM foo
ORDER BY id;
-- returns LINESTRING (0 0 1 1 2 2)
The inside part
GROUP_CONCAT(CONCAT(ST_X(geog),' ',ST_Y(geog)) SEPARATOR ' ')
Creates the point list, and then we just wrap that in LINESTRING ( $pointlist )
answered 24 mins ago
Evan CarrollEvan Carroll
31.6k966214
add a comment |
Because MariaDB (and MySQL) lack all spatial aggregates, the only method is currently to create the WKT, and force MySQL to parse that WKT.
SELECT CONCAT(
'LINESTRING (',
GROUP_CONCAT(CONCAT(ST_X(geog),' ',ST_Y(geog)) SEPARATOR ' '),
')'
)
FROM foo
ORDER BY id;
-- returns LINESTRING (0 0 1 1 2 2)
The inside part
GROUP_CONCAT(CONCAT(ST_X(geog),' ',ST_Y(geog)) SEPARATOR ' ')
Creates the point list, and then we just wrap that in LINESTRING ( $pointlist )
answered 24 mins ago
Evan CarrollEvan Carroll
31.6k966214
Because MariaDB (and MySQL) lack all spatial aggregates, the only method is currently to create the WKT, and force MySQL to parse that WKT.
SELECT CONCAT(
'LINESTRING (',
GROUP_CONCAT(CONCAT(ST_X(geog),' ',ST_Y(geog)) SEPARATOR ' '),
')'
)
FROM foo
ORDER BY id;
-- returns LINESTRING (0 0 1 1 2 2)
The inside part
GROUP_CONCAT(CONCAT(ST_X(geog),' ',ST_Y(geog)) SEPARATOR ' ')
Creates the point list, and then we just wrap that in LINESTRING ( $pointlist )
answered 24 mins ago
Evan CarrollEvan Carroll
31.6k966214
answered 24 mins ago
Evan CarrollEvan Carroll
31.6k966214
answered 24 mins ago
Evan CarrollEvan Carroll
31.6k966214
answered 24 mins ago
Evan CarrollEvan Carroll
31.6k966214
31.6k966214
add a comment |
add a comment |
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