3.4 Catalogue standards
111
dimensional coverage is a 3D-grid with values of atmospheric or oceanographic parameters associated with both horizontal position and height (or depth).
Coverages may have a temporal dimension that is the third or fourth dimension in
the cases of 2- or 3-dimensional coverages respectively. An example of a coverage
with a temporal dimension is a dataset that contains the recorded daily temperatures
of all weather stations of a region over aperiod of at least several days.
Space and the time are summarised as the spatio-temporal domain. The attributes
belong to the attribute domain that is also called the range and a coverage may have
multiple attributes at eaeh position.
A coverage is a "world of its own" and is viewed as a geographie feature. A eoverage includes the operations that are required to use its data whieh leads to the perspeetive that a eoverage is a funetion that relates the spatio-temporal domain to the
attribute domain. An example of such operations is arequest for an attribute value at
a given position.
The ISO 19123 standardises a number ofspeeifie eoverages.1t eomprises the Thiessen polygon eoverage, the quadrilateral grid eoverage, the hexagonal grid coverage, the TIN, and the segmented eurve coverage.
Chapter 4, seetion 5 "Schema for eoverage geometry and funetions" explains the
details ofthe ISO 19123.
3.4 Catalogue standards
3.4.1 Procedure for registration (ISO 19135)
As the number of applications for digital geographie information grows rapidly, a
eentralised registration is a means of promoting eompatibility and avoiding duplicate
efforts. The ISO 19135 (Proeedures for registration of geographieal information
items) specifies procedures for the registration of items of geographieal information.
A registration is the assignment of an unambiguous name to an objeet and the registration authority keeps the registry. The parties submitting their application to the
registration authority are ealled sponsors. An application may include a profile ofthe
19100 series of standards, a feature eatalogue, or other speeifieations for geographie
information. The items may, although it is not essential, be speeified in an International Standard.
The standard allows more than one registration authority but they must be approved by the ISO. In order to allow the user of geographie information to keep an
overview over the authorities involved, their number shall be kept as small as possible. The registration authority keeps the registry as an Internet database.
111
dimensional coverage is a 3D-grid with values of atmospheric or oceanographic parameters associated with both horizontal position and height (or depth).
Coverages may have a temporal dimension that is the third or fourth dimension in
the cases of 2- or 3-dimensional coverages respectively. An example of a coverage
with a temporal dimension is a dataset that contains the recorded daily temperatures
of all weather stations of a region over aperiod of at least several days.
Space and the time are summarised as the spatio-temporal domain. The attributes
belong to the attribute domain that is also called the range and a coverage may have
multiple attributes at eaeh position.
A coverage is a "world of its own" and is viewed as a geographie feature. A eoverage includes the operations that are required to use its data whieh leads to the perspeetive that a eoverage is a funetion that relates the spatio-temporal domain to the
attribute domain. An example of such operations is arequest for an attribute value at
a given position.
The ISO 19123 standardises a number ofspeeifie eoverages.1t eomprises the Thiessen polygon eoverage, the quadrilateral grid eoverage, the hexagonal grid coverage, the TIN, and the segmented eurve coverage.
Chapter 4, seetion 5 "Schema for eoverage geometry and funetions" explains the
details ofthe ISO 19123.
3.4 Catalogue standards
3.4.1 Procedure for registration (ISO 19135)
As the number of applications for digital geographie information grows rapidly, a
eentralised registration is a means of promoting eompatibility and avoiding duplicate
efforts. The ISO 19135 (Proeedures for registration of geographieal information
items) specifies procedures for the registration of items of geographieal information.
A registration is the assignment of an unambiguous name to an objeet and the registration authority keeps the registry. The parties submitting their application to the
registration authority are ealled sponsors. An application may include a profile ofthe
19100 series of standards, a feature eatalogue, or other speeifieations for geographie
information. The items may, although it is not essential, be speeified in an International Standard.
The standard allows more than one registration authority but they must be approved by the ISO. In order to allow the user of geographie information to keep an
overview over the authorities involved, their number shall be kept as small as possible. The registration authority keeps the registry as an Internet database.