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Copy file name to clipboardexpand all lines: doc/manual/pages/android-pc.md
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## Georeferencing when you create a new map
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The first thing to do after creating a new map should be to load a georeferenced template. If you do not have one, you may use for example an OpenStreetMap export in case there is sufficient data at the map's location. To do so, go to http://www.openstreetmap.org, locate the map region, and click 'Export'. Then select an area which covers all of your templates and save the export as .osm file. This file can then be loaded into Mapper as a georeferenced template.
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The first thing to do after creating a new map should be to load a georeferenced template. If you do not have one, you may use for example an OpenStreetMap export in case there is sufficient data at the map's location. To do so, go to https://www.openstreetmap.org, locate the map region, and click 'Export'. Then select an area which covers all of your templates and save the export as .osm file. This file can then be loaded into Mapper as a georeferenced template.
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On loading the first georeferenced template, Mapper will show the georeferencing dialog. This may look a bit intimidating at first, but when loading a template, usually little needs to be changed there. First, the projection type should be checked. If you do not know which projection to use, just select UTM. Second, the magnetic declination should be entered to align the map with magnetic north. You may simply use the lookup button to look it up on the internet for the place of the template you loaded. However, be aware that the lookup only uses a model which may deviate from the real declination. It may be advantageous to check this in the terrain. All remaining values in the georeferencing dialog are already initialized using the newly loaded template, so you can then finish the dialog.
Copy file name to clipboardexpand all lines: doc/manual/pages/georeferencing.md
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#### Introduction
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Georeferencing of a map is the best way for aligning templates (such as base maps or aerial imagery) and GPS tracks. In short, to georeference a map means to establish a known relationship between the paper coordinates of the map and the coordinates of a geographic coordinate reference system. This way, data which is known in a geographic coordinate reference system (such as GPS coordinates) can be transformed to map coordinates and thus displayed on the map, and vice versa the map can be transformed to geographic coordinates and e.g. be displayed on a world map. More information is available on [Wikipedia](http://en.wikipedia.org/wiki/Georeferencing).
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Georeferencing of a map is the best way for aligning templates (such as base maps or aerial imagery) and GPS tracks. In short, to georeference a map means to establish a known relationship between the paper coordinates of the map and the coordinates of a geographic coordinate reference system. This way, data which is known in a geographic coordinate reference system (such as GPS coordinates) can be transformed to map coordinates and thus displayed on the map, and vice versa the map can be transformed to geographic coordinates and e.g. be displayed on a world map. More information is available on [Wikipedia](https://en.wikipedia.org/wiki/Georeferencing).
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Georeferencing properties are set in a dialog which is available from the menu **Map > Georeferencing...**. The dialog is divided in three sections: Map coordinate reference system, Reference point and Map north.
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This section defines in which kind of projected coordinates (real-world metric cartesian coordinates) the reference point relating map and geographic coordinates is defined. Projected coordinates are transformed to map coordinates by scaling and rotation. You should thus choose the coordinate reference system in which you know the real-world coordinates of a point on the map. In case you just want to load some GPS tracks, you can also just safely use UTM, which is widely used world-wide. Other choices are:
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-**Gauss-Krüger**: this is similar to UTM and widely used in Germany, but is being superseded by UTM.
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-**From Proj.4 specification**: projections are internally handled by the [PROJ.4 Cartographic Projections library](http://proj4.org/), so coordinate reference systems can also be given in its internal specification format. Examples may be found at [http://www.remotesensing.org/geotiff/proj_list/ (Internet Archive)](https://web.archive.org/web/20160802172057/http://www.remotesensing.org/geotiff/proj_list/) and [http://spatialreference.org/](http://spatialreference.org/). When selecting this option, the specification field will be pre-filled with the specification of the previously selected coordinate reference system.
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-**From Proj.4 specification**: projections are internally handled by the [PROJ.4 Cartographic Projections library](https://proj4.org/), so coordinate reference systems can also be given in its internal specification format. Examples may be found at [http://www.remotesensing.org/geotiff/proj_list/ (Internet Archive)](https://web.archive.org/web/20160802172057/http://www.remotesensing.org/geotiff/proj_list/) and [http://spatialreference.org/](http://spatialreference.org/). When selecting this option, the specification field will be pre-filled with the specification of the previously selected coordinate reference system.
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-**Local**: this enables you to use local projected coordinates without a mapping to global geographic coordinates.
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Depending on the selected coordinate reference system more settings may show up. For example, for UTM the zone number must be given in addition.
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