Coordinate conversion system and work machine

A coordinate conversion system including a controller that is configured to convert geographic-coordinate-system coordinates of a certain point into site-coordinate-system coordinates by using a coordinate conversion parameter generated on a basis of geographic-coordinate-system coordinates and site-coordinate-system coordinates of a reference point installed at a work site, the coordinate conversion system comprising:

• an image-capturing device that captures an image of the reference point;
• and
• a GNSS antenna that receives a navigation signal, wherein
• the controller is configured to
• calculate geographic-coordinate-system coordinates of the image-capturing device on a basis of the navigation signal received at the GNSS antenna, and a distance between the image-capturing device and the GNSS antenna,
• calculate a distance and direction from the image-capturing device to the reference point by performing image processing on the image of the reference point captured by the image-capturing device,
• calculate the geographic-coordinate-system coordinates of the reference point on a basis of the calculated distance and direction from the image-capturing device to the reference point, and the calculated geographic-coordinate-system coordinates of the image-capturing device, and
• calibrate the coordinate conversion parameter on a basis of the calculated geographic-coordinate-system coordinates of the reference point, and the site-coordinate-system coordinates of the reference point.