[PostGIS] #6005: ST_ProjectionBounds(:srid) function

[PostGIS]

#6005: ST_ProjectionBounds(:srid) function
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 Reporter:  strk         |      Owner:  pramsey
     Type:  enhancement  |     Status:  new
 Priority:  medium       |  Milestone:  PostGIS 3.7.0
Component:  postgis      |    Version:  master
 Keywords:               |
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 It's sometimes useful to pass an extent that's known to contain all the
 data of a given dataset to some function that takes a bounding box
 parameter, but constructing such bounding box is not always practical. It
 could be min-double, max-double I guess but such a bbox geometry might be
 invalid for a given projection so I thought a function that returns the
 largest bounding box geometry valid for a given SRS could be useful.

 Proj does have such functionality:
 https://proj.org/en/stable/development/reference/functions.html#c.proj_get_area_of_use
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/6005>
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