= Support for measured geometries in drivers = 

The support for measured geometries has been implemented in the core.

However, it will take some time for the support to be implemented / work in production ready quality in the drivers.

On this page the work is described.

== Utilities ==

Display M and ZM geometries as such in ogrinfo output : https://lists.osgeo.org/pipermail/gdal-dev/2016-February/043734.html

ogr2ogr :
  * extend -dim to support xy, xyz, xym, xyzm ?
  * extend -nlt to support PolygonM, PolygonZM, etc... ?

== Memory ==

=== Status ===

 * Implemented, no known issues

=== Existing tests ===

 * pass

=== New tests ===

 * swig/perl/t/00-measures-02.t pass

=== Documentation ===

 * to be done

== ESRI Shapefile ==

=== Status ===

 * Implemented
 * Shapefiles which use the "no data" (value < -10^38^) should (perhaps) skip M coordinate.
 * There is no mechanism to switch between the legacy style XYZ and XYZM (M set to "no data") formats.

=== Existing tests ===

 * pass without changes (changes were undone)

=== New tests ===

 * swig/perl/t/00-measures-03.t pass

=== Documentation ===

 * Some changes committed referring to changes in version 2.1 but they need to be reviewed

== PostgreSQL ==

=== Status ===

 * Implemented

=== Existing tests ===

 * pass

=== New tests ===

 * swig/perl/t/00-measures-04.t pass (also for PostGIS 1.5.8)

=== Documentation ===

 * to be done