Geoscience Reference
In-Depth Information
Another OGC standard XML-based known as Symbology Encoding
(SE) gives several cartographers the ability to share the cartographic de-
scription of a map layer. An expert will predefine symbologies to be
shared on a map layer and pushed them as features in WFS. With OGC
tools, the cartographer can export the result of his work as XML based
files which have the capacity to construct several types of maps. As ex-
ample of symbolizer elements which specifies how to draw the symbol,
we can cite: area, point, line, polygon, text, raster. For encoding com-
plex line styles, colored fills, text labels, etc. (Tenet 2008) so we can
easily generate adequate map-legends according to symbology encoding
descriptions (feature type styles and coverage styles). What is just
needed for OGC is to work on a better alignment with ISO 19117 at this
level
4- Discussion and Implemented Solutions
After this overview, we can discuss and evaluate better our main contribu-
tion in this research area.
First of all, we decided to visualize location based services on desktop and
mobile screens by contacting many service providers. In our platform, we
supposed that the geographic objects are points (0D).
To ensure that two objects for the same location based service, listed by
two different providers, are candidates for integration and should be visu-
alized once, different solutions at different levels were selected and
adopted:
4.1 Section 1: Main Contribution for Location Integration
4.1.1 At the geographic integration level, to decide whether two punctual
objects are the same and need to be integrated, the Euclidian distance dE is
used. So as far as the distance between object 1 and object 2 is less than a
threshold of 5 m for example, we can then suggest that these objects are
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