anchor.diff:  + Parameters
   
           + locatedWithin:
  -            - {"type":"bbox","coordinates":[[lon,lat],[lon,lat]]} (string, optional) - top left and bottom right coordinates that construct bounding box;
  -            - {"type":"polygon","coordinates":[[[-10,10],[10,5],[-5,-5],[-10,10]],[[-5,5],[0,5],[0,0],[-5,5]]]} - polygon coordinates.
  +            - {"type":"bbox","coordinates":[[lon,lat],[lon,lat]]} (string, optional) - top left and bottom right coordinates that construct bounding box
  +            - {"type":"polygon","coordinates":[[[-10,10],[10,5],[-5,-5],[-10,10]],[[-5,5],[0,5],[0,0],[-5,5]]]} - polygon coordinates; same as in [GeoJSON Polygon](https://tools.ietf.org/html/rfc7946#section-3.1.6)
               - {"type":"multipolygon","coordinates":[[[[102.0,2.0],[103.0,2.0],[103.0,3.0],[102.0,3.0],[102.0,2.0]]],
                                                      [[[100.0,0.0],[101.0,0.0],[101.0,1.0],[100.0,1.0],[100.0,0.0]],
  -                                                   [[100.2,0.2],[100.8,0.2],[100.8,0.8],[100.2,0.8],[100.2,0.2]]]]} - An array of separate polygons.
  -            - First polygons array describes polygon and another describe holes in it.
  -            - **lon** in degree numeric format and in range <-180,180> eg. -123.454, 179.864
  -            - **lat** in degree numeric format and in range <-90,90> eg. -85.541, 5.32,
  +                                                   [[100.2,0.2],[100.8,0.2],[100.8,0.8],[100.2,0.8],[100.2,0.2]]]]} - a multi-polygon, as in [GeoJSON MultiPolygon](https://tools.ietf.org/html/rfc7946#section-3.1.7)
           + accessVisibility: `public` (string, optional) - station access visibility, valid values is `public` and `private`
           + provider: `WMO,MG` (string, optional) - currently filter by provider or providers. All possible providers are described in section: **Get all providers**
           + type: `SKI_RESORT` (string, optional) - currently filter by type. All possible types are described in section: **Get all station types**
  
positive.code: Returns a list containing all current known data providers. This list can be extended in the future.
  
  
  **NOTE**: The **locatedWithin** parameter has to be encoded before putting it to the request. If you do not, you will receive **empty** response with status code **400 Bad Request**.
  
negative.code:         + hasObservationData: `true` (boolean, optional) - station has observation data.
          + countryIsoCode: `GB` (string, optional) - station located in this country. ISO Code refers to the [ISO 3166 alpha-2 codes](https://en.wikipedia.org/wiki/ISO_3166)
  
  The API supports various combinations for querying stations data by area/region (bounding box, polygon, multi-polygon), by provider or type,
  by stations where MeteoGroup produces forecast or has observation data available.
  Here are a couple of examples how to query by provider and type, bounding box and polygon.
  
  #### Querying by provider or type
  
  Query example:
  
  