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Control of Maps and DEM Files

The render engine of QMapShack is quite flexible and lets you create map stacks with maps of different binary geographic datum, projection and binary format. Additionally it adds elevation information to the displayed maps if DEM data is loaded. The DEM data is completely independent from the loaded map. However the same concepts as for maps apply.

By opening additional workspaces you can have several different map stacks. This allows you to quickly view your data on different maps.

Draw Order

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Map Properties

Workspace

Some properties are set globally for all workspaces. You find them below the View menu.

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The properties for the views:

Not really map related but workspace related:

Map and DEM

If you expand a map or DEM item you can see the property setup of this item for the current workspace.

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  1. The slider on the top controls the opacity.

  2. With the bar and the two buttons you can control the range of scale the map is visible. The blue square on the bar indicates the actual scale. Zoom to the minimum scale you want to see the map and press the left button. Now zoom to the maximum scale to display the map and press the right button. The green bar will indicate the range of visibility now.

Vector Maps

Vector maps have additional properties.

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Use the check boxes to control what major map elements are displayed. For example you can overlay your raster map with a vector map and display the points of interest only, to add more information to your map.

Online Maps

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  1. The path to the tile cache. Each map has it’s own path. The default is “<home_dir>/.QMapShack/<map_file_name>”
  2. The maximum tile cache size.
  3. The maximum age of the tiles in the cache
  4. If the map has more than one layer you can enable/disable the layers

DEM Files

DEM Files have additional properties.

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Hillshading (1) will overlay the map with a gray shaded relief. You can fine tune the contrast of the hillshading with the slider (2). Slope (3) will overlay the map with a color pattern for certain ranges of slopes. The patter reflects the ranges defined by the so called DAV Snow Card. This is a scheme to evaluate the risk of a snow avalanche commonly used in the European Alps. It knows 4 grades of risk. Use the slider (4) to select the grade. You will see the ranges in the legend (5). As a result the map will look a bit strange:

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