PROCESS AND APPARATUS FOR GENERATING MAP DATA IN REAL TIME
The invention has in particular as an object the generation, in real time, of a background map on the basis of a plurality of electronic maps having different projection parameters and geodesic parameters. After at least two electronic maps have been selected ( 300, 800 ), at least part of these maps is converted ( 315 ) according to projection parameters and geodesic parameters predetermined as a function of projection parameters and geodesic parameters associated with each of these selected electronic maps. A background map is then constructed ( 325 ) on the basis of these converted electronic maps.
1 . A method for constructing at least one background map in real time on the basis of a plurality of electronic maps, projection parameters and geodesic parameters being associated with each of the said electronic maps, this method being characterized in that it comprises the following steps,
selection ( 300 , 800 ) of at least two electronic maps among the said plurality of electronic maps;
conversion ( 315 , 815 ) of at least part of the said at least two selected electronic maps according to projection parameters and geodesic parameters predetermined as a function of projection parameters and geodesic parameters associated with each of the said at least two selected electronic maps; and
construction ( 325 , 825 ) of a background map on the basis of the said at least two converted electronic maps.
2 . A method according to claim 1 , characterized in that it additionally comprises a step of adaptation of resolution ( 310 , 810 ) of at least part of one of the said at least two selected electronic maps.
3 . A method according to any one of the preceding claims, characterized in that the said conversion step comprises a step of orthographic azimuthal projection of at least part of the said at least two selected electronic maps.
4 . A method according to any one of the preceding claims, characterized in that each of the said at least two converted electronic maps is represented on a separate graphic layer.
5 . A method according to claim 1 or claim 2 , characterized in that the said conversion step comprises the following steps,
projection of at least part of the said at least two selected electronic maps onto a sphere according to the projection parameters and the geodesic parameters associated with the said at least two selected electronic maps, referred to as first projection; and
projection, onto a plane, of at least part of the said projection of at least part of the said at least two selected electronic maps onto a sphere, referred to as second projection.
6 . A method according to the preceding claim, characterized in that the said second projection is an orthographic azimuthal projection.
7 . A method according to any one of the preceding claims, characterized in that a priority level is assigned to each of the said at least two selected electronic maps.
8 . A method according to any one of the preceding claims, characterized in that it additionally comprises a step of addition of at least one geo-localized datum.
9 . A computer program comprising instructions adapted to the implementation of each of the steps of the method according to any one of the preceding claims.
10 . A device comprising means adapted to implementation of each of the steps of the method according to any one of claims 1 to 8 .