Regulatory aspects
With CartaPrep users can describe in the ArcView GIS
TM environment
the maps to serve: view size and scale, themes, legends, labels, links (using
DocLink). The CartaPrep “Serve maps" function then generates a file
which configures a CartaGen Map Server.
The georeferenced data originate from agreements made between various
producers (Shom, Diren, National Museum, Maritime Authorities...)
as well as lfremer logging and tormatting.
This system authorises the updating of displayed data at any moment.
It can also broadcast documents resulting from a specific analysis or synthesis. An example illustrating the interface and implantation of these
consulting procedures is accessible on the Ifremer Internet site www.ifremer.fr/posnav where the positions of the Institute’s oceanographic fleet
can be observed.
Conclusion
The most important principles in the construction of georeferenced
regulation entities have been drawn up. The main obstacles or technical
difficulties regarding the generation, integration and management of
georeferenced regulation entities in a GIS have been specified and
appropriate structuring modes analysed. The organization of associated
data was also presented in view of facilitating analytical and synthetic
approaches relative to space and activity based constraints. There is
also a description of tools available for users to access the information
more easily. Derailed and illustrated examples of this analysis are
available on the Ifremer Internet site www.lfremer.fr/anglais/org/delao.htm.
Pitfalls in current georeferenced data mainly concern boundaries defined
in distance and administrative boundaries. Even if these limits are
defined theoretically, due to the complexity of the mapping transcription
or negotiations needed, they are not implemented. At the present time,
although there are many boundaries parallel to the coast, transversal
boundaries which divide the coastline are very few.
The technical report drawn up by the Shom-Ifremer working group about
reference data should lead to further analysis in collaboration with
other partners, and also initiate a more global approach concerning
georeferenced information in the shoreline field.
Data production organization must firstly take into account structuring
data and the definition of the required functional units. France has
decided to adopt a geodesic system and a single ellipsoid (RGF 93). This
shoultl help in making the land-sea data more coherent. The building
of a European base means that prior harmonisation of marine references
is necessary.
Technical improvements will contribute to optimising the differential
updating of georeferenced data which is crucial in this thematic field.
Only the 2D transcription has been included in this study, but since
this information may concern the surface, the sea floor (even the subsoil), the water column or several of these elements, and the temporal
dynamic aspect is equally interesting, other types of representation
281
With CartaPrep users can describe in the ArcView GIS
TM environment
the maps to serve: view size and scale, themes, legends, labels, links (using
DocLink). The CartaPrep “Serve maps" function then generates a file
which configures a CartaGen Map Server.
The georeferenced data originate from agreements made between various
producers (Shom, Diren, National Museum, Maritime Authorities...)
as well as lfremer logging and tormatting.
This system authorises the updating of displayed data at any moment.
It can also broadcast documents resulting from a specific analysis or synthesis. An example illustrating the interface and implantation of these
consulting procedures is accessible on the Ifremer Internet site www.ifremer.fr/posnav where the positions of the Institute’s oceanographic fleet
can be observed.
Conclusion
The most important principles in the construction of georeferenced
regulation entities have been drawn up. The main obstacles or technical
difficulties regarding the generation, integration and management of
georeferenced regulation entities in a GIS have been specified and
appropriate structuring modes analysed. The organization of associated
data was also presented in view of facilitating analytical and synthetic
approaches relative to space and activity based constraints. There is
also a description of tools available for users to access the information
more easily. Derailed and illustrated examples of this analysis are
available on the Ifremer Internet site www.lfremer.fr/anglais/org/delao.htm.
Pitfalls in current georeferenced data mainly concern boundaries defined
in distance and administrative boundaries. Even if these limits are
defined theoretically, due to the complexity of the mapping transcription
or negotiations needed, they are not implemented. At the present time,
although there are many boundaries parallel to the coast, transversal
boundaries which divide the coastline are very few.
The technical report drawn up by the Shom-Ifremer working group about
reference data should lead to further analysis in collaboration with
other partners, and also initiate a more global approach concerning
georeferenced information in the shoreline field.
Data production organization must firstly take into account structuring
data and the definition of the required functional units. France has
decided to adopt a geodesic system and a single ellipsoid (RGF 93). This
shoultl help in making the land-sea data more coherent. The building
of a European base means that prior harmonisation of marine references
is necessary.
Technical improvements will contribute to optimising the differential
updating of georeferenced data which is crucial in this thematic field.
Only the 2D transcription has been included in this study, but since
this information may concern the surface, the sea floor (even the subsoil), the water column or several of these elements, and the temporal
dynamic aspect is equally interesting, other types of representation
281