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en:help:v2:maps:file-based-calibrate [2019/10/17 14:23] alpinequesten:help:v2:maps:file-based-calibrate [2019/10/17 14:56] 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? ======
 \\ \\
-The application allows you to use regular images as maps.+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.
 +
 +The supported image formats are: JPEG, PNG, BMP<sup>1</sup>, GIF<sup>1</sup>, WebP<sup>1,2</sup>, HEIF<sup>1,3</sup>.\\
 +<sup>1: size limit may apply based on your device configuration; 2: Android 4.0+; 3: Android 8.0+</sup>
 +
 +To calibrate an image:
   * Select a base map over which one you'll calibrate your image. The application will display the imported image so that it almost covers the current view (as displayed by the white dotted line {{:icon_01.png?nolink}}). To make the calibration process easier, select a location and zoom level that approximately match the area covered by your image before importing it;   * Select a base map over which one you'll calibrate your image. The application will display the imported image so that it almost covers the current view (as displayed by the white dotted line {{:icon_01.png?nolink}}). To make the calibration process easier, select a location and zoom level that approximately match the area covered by your image before importing it;
   * Tap the ''"**Maps & Layer**"'' {{:icon_02.png?nolink}} menu and ''"**Available maps**"'' {{:icon_03.png?nolink}} to open the maps explorer;   * Tap the ''"**Maps & Layer**"'' {{:icon_02.png?nolink}} menu and ''"**Available maps**"'' {{:icon_03.png?nolink}} to open the maps explorer;
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 When you've selected the correct folder, tap the image {{:icon_05.png?nolink}} to start the import process. When the image has been imported, it's displayed over the current map. When you've selected the correct folder, tap the image {{:icon_05.png?nolink}} to start the import process. When the image has been imported, it's displayed over the current map.
  
-{{ :en:help:v2:maps:file-based-calibrate-2.jpg?nolink }}+By default, the 4 calibration points are placed on the four corners.
  
-The application requires you to correctly match four (4) calibration points with the base map. By default, those points are placed on the four corners.+{{ :en:help:v2:maps:file-based-calibrate-2.jpg?nolink }}
  
 For each calibration point: For each calibration point: