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Description:
VPF Vector
Product Format is a standard data format,
structurally organized for
geographic databases, intended for direct
use based on a georelational data model.
VPF designed
to be compatible with a wide variety of
applicable vector format viewers, such as
our powerful
Global Mapper
GIS mapping 3D software, while
reading vector based format directly without
conversion to an intermediate form.
Product
specification corresponding to a specific
VPF geodatabase product determines the
precise contents of feature tables and their
relationships in the database.
Vector Product
Format easily uses tables and indexes permitting
direct access by spatial location and
thematic content designed where any digital
geographic data in vector format to be
represented using faces, edges, and
nodes.
VPF defines
the vector file format of data objects, and
the georelational data model provides a data
organization within which software can
manipulate the VPF data objects.
Vector Product
Format files are commonly used by GIS
mapping users for vector data sets such as VMAP
(Vector Map of the
World) and DNC (Digital
Nautical Chart).
To load a VPF database,
in our Global
Mapper v6.00 and above, either select the dht file at the root of
the VPF database tree or select the lht file
at a lower level to load just one coverage
from the database (the latter option is
usually useful for DNC charts).
Available
for free? Yes.
Web
Pages and FTP Sites:
VPF
Military Standard
NGA
Raster Roam-VMAP Downloads
NGA
Digital Nautical Charts
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