[GIS] How do get North, East, South, or West bounds from Cesium map

cesium

I see that there is an option that allows for one to set the view if you provide the coordinates for these bounds, but nowhere in the documentation do I see anything pertaining to retrieving these values as defined by the canvas container / rectangle.

Best Answer

The current view bounds can be calculated by Camera.computeViewRectangle. Note that the results here can be approximate, due to the complexity of a perspective 3D view of the globe.

For details on that, see Cesium 3D - Determining the Map Scale of the viewed Globe.

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[GIS] Usage of Cesium Geoserver Terrain Provider Plugin for a single tile of SRTM90 data

If you are trying to visualize terrain in Cesium, you should know that there is a publicly accessible Terrain Server that is built for performant visualization in Cesium. The STK World Terrain is built from multiple terrain sources that are layered together into a single unified tileset; the CGIAR SRTM is one of the datasets that feeds into the World Terrain.

Be sure to check out the Cesium Terrain and Water Tutorial to see how to use terrain in Cesium, including the use of Terrain Lighting and Water Effects: http://cesiumjs.org/2013/02/15/Cesium-Terrain-Tutorial/

[GIS] Interactions in OpenLayers 3 – Cesium

If you look at the selection.js source of the example you linked, you will see these lines:

var ol3d = new olcs.OLCesium({map: map, target: 'map3d'});
var scene = ol3d.getCesiumScene();
ol3d.setEnabled(true);

This sets up the link between the OpenLayers map and the Caesium view, not the interaction control, which deals with events in the OpenLayers map view only. Here is the relevant Caesium source code. In that code, you will see that the linking is done via two further modules, RasterSynchronized and VectorSynchronizer.

The comments at the top of both of these files make it clear that the interaction is only from OpenLayers to Caesium, eg,

Unidirectionally synchronize OpenLayers vector layers to Cesium.

The ol.interaction.Select that comes later deals entirely with updating the styles on the OpenLayers map view, it is no way relates to the interaction with Caesium.

Best Answer

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