update documentation for CLI usage in USAGE.md

docs/USAGE.md

@@ -5,7 +5,11 @@ wahooMapsCreator can be used in two different ways:
 
 Both ways support the same arguments to be used for the map-creation process. You can choose the arguments via GUI or as [CLI-arguments](#advanced-cli-usage).
 
-### GUI (Graphical User Interface)
+## Run wahooMapsCreator for your country
+It might be a good idea to run wahooMapsCreator first for a small country e.g. Malta to check if everything is running fine.
+In a next step you can run it for your own country.
+
+## GUI (Graphical User Interface)
 
 From the `root` folder of wahooMapsCreator, run:
   - `python wahoo_map_creator.py gui`
@@ -14,7 +18,7 @@ Set your arguments as required via the window:
 
 <img src="https://github.com/treee111/wahooMapsCreator/blob/develop/docs/gui.png" alt="wahooMapsCreator GUI" width=35%>
 
-### CLI (Command Line Interface)
+## CLI (Command Line Interface)
 
 From the `root` folder of wahooMapsCreator, run:
 - `python wahoo_map_creator.py cli -co <country_name>`
@@ -23,19 +27,28 @@ Examples:
 - for Malta: `python wahoo_map_creator.py cli -co malta`
 - for Ireland: `python wahoo_map_creator.py cli -co ireland`
 
-### Run wahooMapsCreator for your country
-It might be a good idea to run wahooMapsCreator first for a small country e.g. Malta to check if everything is running fine.
-In a next step you can run it for your own country.
-
-### Advanced CLI-Usage
+## Advanced CLI-Usage
 The script supports many arguments via command line.
 For a list of all supported arguments, run:
 - `python wahoo_map_creator.py cli -h`
 
-Examples:
+### Main arguments
+**Create maps for a country**
+- `python wahoo_map_creator.py cli -co <country>`
+
+**Create maps for X/Y coordinates**
+
+In particular for testing adjustments in configuration-files or coding it is helpful to create maps for only one tile or a handful of tiles!
+
+To create maps for only one tile and not a whole country, one can use the X/Y coordinates of that tile. X/Y coordinates can be retrieved from this in zoom-level 8: [link](http://tools.geofabrik.de/map/#8/50.3079/8.8026&type=Geofabrik_Standard&grid=1). 
+- `python wahoo_map_creator.py cli -xy <xy_coordinate,xy_coordinate>`
+
+### Examples
 - for Malta, download new maps if existing maps are older than 100 days and process files even if files exist
   - `python wahoo_map_creator.py cli -co malta -md 100 -fp`
 - for Germany, download and process whole tiles which involves other countries than the given
   - `python wahoo_map_creator.py cli -co germany -bc`
-- to create maps for only one tile and not a whole country, one can use the X/Y coordinates of that tile. X/Y coordinates can be retrieved from this [link]([#advanced-cli-usage](http://tools.geofabrik.de/map/#8/50.3079/8.8026&type=Geofabrik_Standard&grid=1)) in zoom-level 8.
-  - `python wahoo_map_creator.py cli -xy 134/88`
+- to create maps for only one tile
+  - `python wahoo_map_creator.py cli -xy 134/88`
+- for multiple tiles
+  - `python wahoo_map_creator.py cli -xy 134/88,133/88`