Color Map Layers

General

Color map layers, or paletted data layers are single channel data layers, for example elevation data, which can be colored according to a user definable palette. Values in the map data are matched with colors in the palette, and the neighboring values may be interpolated over the span of colors in the palette.

Colors may be mapped directly to data values, or there may be a calculation involved. For example we have the possibility to assign colors based on slope or aspect of elevation data sets.

• 

  Elevation values

• 

  Elevation without smoothing

• 

  Slope values

Low Level API

The main API for creating elevation color map layers is through the IMapLayerViewModel interface with the following methods

namespace TPG.GeoFramework.MapLayer.Contracts
{
    public interface IMapLayerViewModel : IExportableLayer
    {
       ...
        /// <summary>
        /// Create a named color map layer with the given data provider.
        /// </summary>
        /// <param name="name">Name for the new layer.</param>
        /// <param name="provider">Data provider. </param>
        /// <param name ="paletteId">ID of the palette to be used. This palette name must be available in the given data provider.</param>
        /// <param name="smoothInterpolation">Enable smooth interpolation of the map colors.</param>
        /// <returns>A new raster layer with the given properties.</returns>
        IMapServiceRasterLayerData AddColorMapLayer(string name, IMapDataProvider provider, string paletteId, bool smoothInterpolation = true);

        /// <summary>
        ///  Return raster layer for elevation color map (if any).
        /// </summary>
        /// <returns></returns>
        IRasterLayerData GetColorMapLayer(string name);

        /// <summary>
        /// Remove the given color map layer from the layer list.
        /// </summary>
        /// <param name="layer"></param>
        void RemoveColorMapLayer(IMapServiceRasterLayerData layer);

    }
}

The default implementation of this interface is typically TPG.GeoFramework.MapLayer.NativeMapLayerViewModel.