40
2 Geomatics standards
provides one or more registries. The rules for creating these registries are described
in the ISO 19135 (Procedures for registration of geographical information items). A
specific registry for Coordinate Reference Systems is defined in the ISO 19127
(Geodetic codes and parameters). If parameters are needed, they can be requested
from one of the ISO-approved registration authorities.
Data display
According to the ISO 19117 (Portrayal), the graphie representation is handled independently from the feature data. In the case of the tourism-GIS an individual feature portrayal is defined for each of the features such as the roads and hiking trails.
All necessary feature portrayals are summarised in a listing ealled the feature catalogue that eontains one entry for eaeh feature in the dataset. Consequently, the feature eatalogue ofthe tourism-GIS has 11 entries.
Eaeh feature portrayal points to a rule that will be applied when drawing that feature. The rule itself is outside the scope of the ISO 19100 standards. In order to handle more sophistieated graphies, like the automatie opening of a road interseetion,
the ISO 19117 allows the usage of external funetions. The summary of all portrayal
elements is the portrayal speeifieation. During the output of the feature data, this
speeification is applied to the data stream in order to generate the eartographie representation.
The following table shows the portrayal eatalogue of the tourist GIS (class
PF _PortrayalCatalogue)
Table 2.3. Portrayal eatalogue of a tourism-GIS
PF _FeaturePortrayal
Beach
Bridge
Campground
Field
Hiking trail
Lake
Parking
Road
Stream
Theatre
Wood
PF _PortrayalRule
white area, border with black solid line, thickness 0.2 mm, letter B at
the representativePoint
place bridge symbol
white area, border with black solid line, thickness 0.2 mm, letter C at
the representativePoint
white area, border with black solid line, thickness 0.2 mm
dashed black line, line 2 mm, space 2 mm, thickness 0.2 mm
white area, border with solid black line, thickness 0.2 mm
white area, border with black solid line, thickness 0.2 mm, letter P at
the representativePoint
two black solid parallellines with a thickness ofO.2 mm each, one line
I mm to the left and the other line I mm to the right ofthe road's axis,
interrupt lines to open roads at intersections,
show roads at highest priority if overlay with other graphics occur
solid black line, thickness 0.2 mm
one circle, and two concentric semi-circles, solid black lines, thickness
0.2mm
white area, border with black solid line, thickness 0.2 mm, place tree
symbols at irregular positions
2 Geomatics standards
provides one or more registries. The rules for creating these registries are described
in the ISO 19135 (Procedures for registration of geographical information items). A
specific registry for Coordinate Reference Systems is defined in the ISO 19127
(Geodetic codes and parameters). If parameters are needed, they can be requested
from one of the ISO-approved registration authorities.
Data display
According to the ISO 19117 (Portrayal), the graphie representation is handled independently from the feature data. In the case of the tourism-GIS an individual feature portrayal is defined for each of the features such as the roads and hiking trails.
All necessary feature portrayals are summarised in a listing ealled the feature catalogue that eontains one entry for eaeh feature in the dataset. Consequently, the feature eatalogue ofthe tourism-GIS has 11 entries.
Eaeh feature portrayal points to a rule that will be applied when drawing that feature. The rule itself is outside the scope of the ISO 19100 standards. In order to handle more sophistieated graphies, like the automatie opening of a road interseetion,
the ISO 19117 allows the usage of external funetions. The summary of all portrayal
elements is the portrayal speeifieation. During the output of the feature data, this
speeification is applied to the data stream in order to generate the eartographie representation.
The following table shows the portrayal eatalogue of the tourist GIS (class
PF _PortrayalCatalogue)
Table 2.3. Portrayal eatalogue of a tourism-GIS
PF _FeaturePortrayal
Beach
Bridge
Campground
Field
Hiking trail
Lake
Parking
Road
Stream
Theatre
Wood
PF _PortrayalRule
white area, border with black solid line, thickness 0.2 mm, letter B at
the representativePoint
place bridge symbol
white area, border with black solid line, thickness 0.2 mm, letter C at
the representativePoint
white area, border with black solid line, thickness 0.2 mm
dashed black line, line 2 mm, space 2 mm, thickness 0.2 mm
white area, border with solid black line, thickness 0.2 mm
white area, border with black solid line, thickness 0.2 mm, letter P at
the representativePoint
two black solid parallellines with a thickness ofO.2 mm each, one line
I mm to the left and the other line I mm to the right ofthe road's axis,
interrupt lines to open roads at intersections,
show roads at highest priority if overlay with other graphics occur
solid black line, thickness 0.2 mm
one circle, and two concentric semi-circles, solid black lines, thickness
0.2mm
white area, border with black solid line, thickness 0.2 mm, place tree
symbols at irregular positions