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SRTM Profiles The SRTM map is displayed in the Map View The map is not loaded from the internet, it is painted in the application and is based on SRTM data. It draws the same elevation with the same color but the color for each elevation can be customized. Before the map can be painted, the SRTM data needs to be downloaded from the internet and are stored locally at this location to reuse it when the same location is painted again. The downloading status of SRTM data and other tile infos are displayed in the map info toolbar.
Use Offline Map It is recommended to use the offline map feature, which is described here because painting the map is CPU intensive and only a few images are cached in memory. Using offline images slows down a little bit the creation of the map tiles but already computed and saved map tiles are displayed much faster.
A SRTM profile defines the colors and other properties how the map is drawn. The SRTM map in the Map View
Choose a color A color can be choosen by clicking with the mouse in the Hexagon tab or by setting the sliders in the RGB/HSB tab. The selected color is displayed in the color area above the color chooser.
Apply a color The choosen color can be applied to an elevation by clicking with the left mouse button into the elevation color area. When clicking with the right mouse button in the elevation color area, the color for the color chooser will be set.
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when it's selected in the map provider list, this is described 
