PtData (Point Data Dictionary), Geospatial Features, Adobe Suppliment to the ISO 32000, extension level 3
In 8.8.1 Geospatial Features chapter, Point Data Dictionary sub-chapter are written:
Any 2D object (image XObject....) that contains a measure dictionary
of subtype GEO can optionally include a PtData entry.
The value of a PtData entry is a point data dictionary or an array
of point data dictionaries of extended data associated with points in the 2D space.
Table 8.111d list the entries of a point data dictionary.
.....
There are three predefined names:
LAT, latitude in degress. The XPTS value is a number type.
LON, longitude in degrees. The XPTS value is a number type.
ALT, altitude in meters. The XPTS value is a number type.
.....
I have already generated a valid measure dictionary of subtype GEO.
In Adobe Reader XI:
Edit -> Analysis -> Geospatial Location tool
it shows latitude\longitude for the selected point of flat PDF map.
I.e. it works fine!
However, I am interesting to show altitude (elevation) for the selected point.
As I understand heights map could be specified by PtData dictionary.
But I do not see any "elevation", or "height", or "altitude" parameter in Geospatial location tool.
What do I wrong?
I tried to find some working example of such 2D geo-registred PDF file in internet
which also contains information about elevation (or altitude) in PtData dictionary,
but unsuccessfully.
I think that it could be very good if some flat PDF map will reports elevation for the specified point.
Any advise is appreciated.