Interpolated layer

The interpolated layer is an Openlayers (hereafter OL) Image as ImageLayer that uses the HSLayers InterpolatedSource class as it's source. InterpolatedSource extends the IDW (Inverse distance weighting interpolated source - Shepard's method) class of the ol-ext library, which inherits the OL ImageCanvas class. InterpolatedSource uses the OL Vector as VectorSource class to provide user-defined feature loading strategy and source loader functionality, to obtain the features. To generate a raster image, displaying data interpolation, the user must provide value (weight), by which the image can be generated. As a result, collected features are parsed, weight values are normalized (between 0 and 100) and the image is drawn and displayed over the map. The user also has the option to change the color map. It can be a string value, name representing one of the available color maps, or a function, which handles color selection for each features weight value.