ST_Max_Distance is not yet implemented?

[robe]

What steps will reproduce the problem? SELECT ST_Max_Distance(ST_GeomFromText('LINESTRING(1 0, 3 0)'), ST_GeomFromText('LINESTRING(3 0, 5 0)'))

What is the expected output? huh I think 4

What do you see instead?

ERROR: This function is unimplemented yet

Error

ERROR: This function is unimplemented yet SQL state: XX000

What version of the product are you using? On what operating system? Windows - 'POSTGIS='1.3.3' GEOS='3.0.0-CAPI-1.4.1' PROJ='Rel. 4.6.0, 21 Dec 2007' USE_STATS' I think I tried on OpenSUSE 11 1.3.4 SVN and got the same unsatisfying answer. I'll have to double-check that.

Please provide any additional information below. I think the trunk lwpostgis.sql.in.c has this comment

Maximum distance between linestrings. 2d only. Very bogus. — Availability: 1.2.2

And I thought it did something way back yander, but could have been my imagination or it was removed because as the comment says its bogus?

[robe]

Someone needs to look at Nicklas patch he attached in #137 for max distance to see how far off he is from a working solution. Would be nice to see this working in 1.4.1 and possibily 1.3.7.

[post...@…]

I have made a new try on st_maxdistance and now I think it is working as I want. The last try was very bad. There is a new patch in #137

/Nicklas Avén

[nicklas]

Document-patch for max_distance function

[nicklas]

in max_distance_new_poly_poly_20090717.patch

there is a big rewrite of polygon-polygon handling in distance-measurement more about it in #137

[pramsey]

If the implementation of this is bound up with the other distance fixes, please move this to milestone 1.5 and this issue will just have to remain in 1.4 as is. I'd also like to rename to ST_MaxDistance() in 1.5.