Adobe Acrobat SDK
Interactive Features (Chapter 8 in PDF Reference)
Adobe® Supplement to the ISO 32000
8.8.1 Geospatial Features 50
TABLE 8.111a Additional entries specific in a geospatial measure dictionary
KEY
TYPE
VALUE
Bounds
array
(
Optional; ExtensionLevel 3
) An array of numbers taken pairwise that
define a series of points that describes the bounds of an area for
which geospatial transformations are valid. For maps, this
bounding polygon is know as a
neatline
. These numbers are
expressed relative to a unit square that describes the
BBox
associated with a Viewport or form XObject, or the bounds of an
image Xobject.
If not present, the default values define a rectangle describing the
full unit square, with values of [0.0 0.0 0.0 1.0 1.0 1.0 1.0 0.0].
Note:
The polygon description need not be explicitly closed by
repeating the first point values as a final point.
GCS
dictionary
(
Required; ExtensionLevel 3
) A projected or geographic coordinate
system dictionary.
DCS
dictionary
(
Optional; ExtensionLevel 3)
A projected or geographic coordinate
system to be used for the display of position values, such as
latitude and longitude. Formatting the displayed representation of
these values is controlled by the conforming reader.
PDU
array
(
Optional; ExtensionLevel 3
) Preferred Display Units. An array of
three names that identify in order a linear display unit, an area
display unit, and an angular display unit.
The following are valid linear display units:
M
, a meter
KM
, a kilometer
FT
, an international foot
USFT
, a U.S. Survey foot
MI
, an international mile
NM
, an international nautical mile
The following are valid area display units:
SQM
, a square meter
HA
, a hectare (10,000 square meters)
SQKM
, a square kilometer
SQFT
, a square foot
A
, an acre
SQMI
, a square mile
The following are valid angular display units:
DEG
, a degree
GRD
, a grad (1/400 of a circle, or 0.9 degrees)
