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en:help:v2:elevations [2018/09/30 10:52]
alpinequest [Digital Elevation Model (DEM)]
en:help:v2:elevations [2019/03/13 13:09] (current)
alpinequest
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-<​sub>​[[en:​help|Online Help]] > [[en:​help:​v2|AlpineQuest 2.x]] > [[en:​help:​v2:​maps|Maps & Layers]]</​sub>​+<​sub>​[[en:​help|Online Help]] > [[en:​help:​v2|AlpineQuest 2.x]] > [[en:​help:​v2:​maps|Maps & Layers]] ​> Digital Elevation Model (DEM)</​sub>​
  
 ====== Digital Elevation Model (DEM) ====== ====== Digital Elevation Model (DEM) ======
 \\ \\
-The application ​is able to download and store elevation values of remote locations and let you use them in various ways, even while being offline.+This feature allows the application to download and store elevation values of remote locations and let you use them in various ways, even while being offline.
  
 Those elevations come from various sources including the SRTMGL1(v3) database and are currently available between latitude 56°S and 60°N with a precision of 1″ (1 arc-second). Those elevations come from various sources including the SRTMGL1(v3) database and are currently available between latitude 56°S and 60°N with a precision of 1″ (1 arc-second).
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 Be sure to also check ''"​**Auto download elevation data**"''​ {{:​icon_06.png?​nolink}} so the application automatically downloads needed areas from our servers. If you want to use your own elevation data (see below), then un-check this option. Be sure to also check ''"​**Auto download elevation data**"''​ {{:​icon_06.png?​nolink}} so the application automatically downloads needed areas from our servers. If you want to use your own elevation data (see below), then un-check this option.
  
-Close the maps explorer by tapping on {{:​icon_07.png?​nolink}}. As you move the map, the elevation of the screen center point {{:​icon_08.png?​nolink}} is given along with its coordinates.+Close the maps explorer by tapping on {{:​icon_07.png?​nolink}}. As you move the map, the elevation of the screen center point {{:​icon_08.png?​nolink}} is given along with its coordinates. If the [[en:​help:​v2:​settings:​locations-and-grids#​how_to_display_or_hide_the_screen_center_coordinates|screen center coordinates]] are not displayed, the elevation on the center point will be displayed alone {{:​icon_08.png?​nolink}}.
  
-{{:​icon_help.png?​nolink}} Be sure to have the [[en:​help:​v2:​settings:​locations-and-grids#​how_to_display_or_hide_the_screen_center_coordinates|screen center coordinates displayed]]. +If you want to check the coverage of stored elevation values, you can display the ''"​**Elevation data coverage**"''​ {{:icon_10.png?​nolink}} layer by tapping it. Stored areas will be displayed {{:icon_11.png?​nolink}} over the current map.
- +
-If you want to check the coverage of stored elevation values, you can display the ''"​**Elevation data coverage**"''​ {{:icon_09.png?​nolink}} layer by tapping it. Stored areas will be displayed {{:icon_10.png?​nolink}} over the current map.+
  
 {{ :​en:​help:​v2:​maps:​elevations-use.jpg?​nolink }} {{ :​en:​help:​v2:​maps:​elevations-use.jpg?​nolink }}
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 \\ \\
  
-If you have troubles downloading ​areas of elevation values, ​you can check that:+If you have troubles downloading elevation values, check that:
   * Your Internet connection is active;   * Your Internet connection is active;
   * The option ''"​**Auto download elevation data**"''​ is checked (you can also access it directly from the ''"​**Maps**"''​ menu, in the ''"​**Options**"''​ section);   * The option ''"​**Auto download elevation data**"''​ is checked (you can also access it directly from the ''"​**Maps**"''​ menu, in the ''"​**Options**"''​ section);
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   * ''"​**DEM Terrain**"''​ {{:​icon_02.png?​nolink}}:​ a map with more close to reality elevation colors, hills-shading and grayed cliffs (>45°);   * ''"​**DEM Terrain**"''​ {{:​icon_02.png?​nolink}}:​ a map with more close to reality elevation colors, hills-shading and grayed cliffs (>45°);
   * ''"​**DEM Hillshade Layer**"''​ {{:​icon_03.png?​nolink}}:​ a layer that can be added over any map, emphasizing relief by simulating hill shades;   * ''"​**DEM Hillshade Layer**"''​ {{:​icon_03.png?​nolink}}:​ a layer that can be added over any map, emphasizing relief by simulating hill shades;
-  * ''"​**DEM Slopes (+30°) Layer**"''​ {{:​icon_04.png?​nolink}}:​ a layer that can be added over any map, emphasizing steep slopes: yellow (>30°), orange (>35°), red (>40°) and purple (45°);+  * ''"​**DEM Slopes (+30°) Layer**"''​ {{:​icon_04.png?​nolink}}:​ a layer that can be added over any map, emphasizing steep slopes: ​transparent to yellow (25° -> 30°), ​yellow to orange (30° -> 35°), ​orange to red (35° -> 40°) and red to purple (40° -> 45°);
   * ''"​**DEM Heights (sensitive)**"''​ {{:​icon_05.png?​nolink}}:​ a map showing the smallest elevation variations;   * ''"​**DEM Heights (sensitive)**"''​ {{:​icon_05.png?​nolink}}:​ a map showing the smallest elevation variations;
  
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   * Select ''"​**Details**"''​ {{:​icon_03.png?​nolink}} and check the ''"​**Statistics**"''​ {{:​icon_04.png?​nolink}} part.   * Select ''"​**Details**"''​ {{:​icon_03.png?​nolink}} and check the ''"​**Statistics**"''​ {{:​icon_04.png?​nolink}} part.
  
-{{ :​en:​help:​v2:​landmarks:auto-routing-4.jpg?nolink }}+{{ :​en:​help:​v2:​maps:elevations-profile.jpg?nolink }}
  
 \\ \\
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 In order to delete the elevation data stored on your device: In order to delete the elevation data stored on your device:
   * Tap on the "''​**Elevation data coverage**''"​ menu icon {{:​icon_01.png?​nolink}};​   * Tap on the "''​**Elevation data coverage**''"​ menu icon {{:​icon_01.png?​nolink}};​
-  * Select "''​**Clear data**''"​ {{:icon_03.png?​nolink}};​ +  * Select "''​**Clear data**''"​ {{:icon_04.png?​nolink}};​ 
-  * Tap "''​**Ok**''"​ {{:icon_04.png?​nolink}} to confirm;+  * Tap "''​**Ok**''"​ {{:icon_05.png?​nolink}} to confirm;
  
-Independently, you can delete the data used by maps and layers generated from the stored elevation data. To do so, select ​the menu icon {{:​icon_02.png?​nolink}} of the map you want to delete the data.+In addition, you can delete the data used by maps and layers generated from the stored elevation data. To do so, use the menu {{:​icon_02.png?​nolink}} of the map you want to delete the data, or the group menu {{:​icon_03.png?​nolink}} if you want to delete the data of all maps.
  
 {{ :​en:​help:​v2:​maps:​elevations-clear.jpg?​nolink }} {{ :​en:​help:​v2:​maps:​elevations-clear.jpg?​nolink }}
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   * Files containing 3601x3601 values (1″) must have a size of ''"​**25,​934,​402 bytes**"'';​   * Files containing 3601x3601 values (1″) must have a size of ''"​**25,​934,​402 bytes**"'';​
  
-The files must be copied inside the sub-folder ''"​**/​cache/​dem/​**"''​ of [[en:​help:​v2:​settings:​storage#​how_to_locate_the_application_folder|the application folder]] (the same folder used by the application to store the downloaded elevation data).+The files must be copied inside the sub-folder ''"​**/​datastore/​dem/​**"''​ of [[en:​help:​v2:​settings:​storage#​how_to_locate_the_application_folder|the application folder]] (the same folder used by the application to store the downloaded elevation data).
  
 {{:​icon_help.png?​nolink}} If your own data doesn'​t cover a requested area, the application will automatically download the missing data in its own format which may interfere with your own data. Be sure to turn off the automatic download of elevation data (see first paragraph). {{:​icon_help.png?​nolink}} If your own data doesn'​t cover a requested area, the application will automatically download the missing data in its own format which may interfere with your own data. Be sure to turn off the automatic download of elevation data (see first paragraph).

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