| addAreaPolygons | Add Area Polygons to a Map |
| addCityShape | Adds a choropleth map layer for citys with additional customization options. |
| addProvinceShape | Adds a choropleth map layer for provinces with additional customization options. |
| addTilesAmap | Adds a tile layer from Amap to a leaflet map. |
| areaCalculator | Calculate the area of a polygon defined by latitude and longitude points |
| china_city | city data for China |
| china_province | province data for China |
| convertCoordinates | Convert Coordinates Between Different Systems |