Examples of com.bbn.openmap.dataAccess.dted.DTEDFrameCache

com.bbn.openmap.dataAccess.dted.DTEDFrameCache

The DTEDFrameCache is an object that retrieves DTED paths, frames or elevation values, given a latitude, logitude and dted level. It maintains a collection of the frames it has already used for quicker access later. The size of the cache is determined by startup settings.

The DTEDFrameCache can be placed in the MapHandler, where other objects can share it in order to all use the same DTED data. It can be configured with properties:

 frameCache.cacheSize=40 frameCache.directoryHandlers=dteddir1 dteddir2 frameCache.dteddir1.translator=com.bbn.openmap.dataAccess.dted.StandardDTEDNameTranslator frameCache.dteddir1.path=/data/dted frameCache.dteddir2.translator=com.bbn.openmap.dataAccess.dted.StandardDTEDNameTranslator frameCache.dteddir2.path=/data/dted

A DTEDDirectoryHandler needs to be specified for each DTED directory you want to use. If a translator isn't specified in the properties for a directory handler, the StandardDTEDNameTranslator will be used. If you have DTED data that doesn't conform to the naming conventions specified in the Military Standard, you can use a different DTEDNameTranslator instead for your particular directory handler.

     * radian arc distance of the point from the center point of the
     * image, on the earth. This slope calculation does take the
     * earth's curvature into account, based on the spherical model.
     */
    protected double calculateLOSslope(LatLonPoint cord, float arc_dist) {
        DTEDFrameCache frameCache = layer.frameCache;


        if (frameCache == null) {
            return 0;
        }


        int xyheight = frameCache.getElevation(cord.getLatitude(),
                cord.getLongitude());
        double ret = 0;
        double P = Math.sin(arc_dist)
                * (xyheight + Planet.wgs84_earthEquatorialRadiusMeters);

     */
    public void findAndUndo(Object obj) {
        if (obj instanceof DTEDFrameCache) {
            Debug.message("graphicloader",
                    "LOSGraphicLoader: removing DTEDFrameCache");
            DTEDFrameCache dfc = getDTEDFrameCache();
            if (dfc == obj) { // Check to see if they are the same
                              // object
                setDTEDFrameCache(null);
            }
        }

Examples of com.bbn.openmap.dataAccess.dted.DTEDFrameCache

Related Classes of com.bbn.openmap.dataAccess.dted.DTEDFrameCache