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en:help:v2:maps:file-based-calibrate [2019/10/17 14:47] – alpinequesten:help:v2:maps:file-based-calibrate [2019/10/17 14:53] – alpinequest
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 ====== How to calibrate an image to use it as a map? ====== ====== How to calibrate an image to use it as a map? ======
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-The application allows you to use regular images as maps. In order to correctly locate items (points, tracks, etc.) on this map, the application must know what is the exact area covered, this is done by the calibration process: after displaying the image, you must match 4 points with another existing and correct map.+The application allows you to use regular images as maps. In order to correctly locate items on this map (points, tracks, etc.), the application must know what is the exact area covered, this is done by the calibration process: after displaying the image, you must match 4 points with another existing and correct map. This process is done only one time, then the image is imported as a regular map file.
  
 {{:icon_help.png?nolink}} The calibration process used by this application requires 4 points, which is enough to correctly match an image over a base map without knowing the exact map projection which is used, and gives satisfactory result for maps with limited areas. {{:icon_help.png?nolink}} The calibration process used by this application requires 4 points, which is enough to correctly match an image over a base map without knowing the exact map projection which is used, and gives satisfactory result for maps with limited areas.