Specify Metadata Early and Let Eonfusion Do the Work for You
By setting Metadata for the attributes in your data, Eonfusion is able to make smart decisions about how to use those attributes. In particular:
- Usage is important. It allows you to map specific attributes to a notional purpose for their use.
- Units are important. Eonfusion can then convert between different units when required.
- Defining a projection enables Eonfusion to convert between projections when required.
An example is the scene view, which by default maps the attributes with usages Spatial X, Spatial Y and Spatial Z onto its x, y and z coordinates. It also maps the attribute with usage Time onto the slider coordinate. Setting these usages as part of the metadata allows the scene to automatically map attributes onto the relevant coordinates.
Projection metadata for the scene axes enable the scene view to automatically convert the projection for geographic data that is input to the scene, if a conversion is required. However this can only work if the input data has projection metadata.
The screenshot below shows this in action:
- The data structure for the scene object gives the details of all the data piped into the scene - in this case a GPS track, a Bathymetry dataset and an aerial photo. Note the Usage of the XYZ attributes in the bathymetry dataset and the lat, lon, and datetime attributes in the GPS track dataset. Also note the bathymetry dataset has a WGS 84 UTM projection set and the GPS track has a WGS84 latitude/longitude (geodetic) projection. These metadata specifications are usually made in the data source objects in the dataflow, but can be altered at any point in the dataflow.
- The scene properties are set with an appropriate projection and usage for the X Y and Z axes and the slider.
- The GPS points visualizer automatically uses the Usage settings to map the lon, lat and datetime attributes to the X Y axes and the slider (with no attribute mapped to the z-axis)
- All the visualizers are displayed in the scene and re-projected on demand to the set scene projection
