A solid-state spin sensor system for precisely measuring magnetic fields with a compliantly coupled sensor head exhibiting translational and rotational compliance is disclosed. The sensor includes a color center ensemble in a solid-state substrate for detecting magnetic fields with high spatial resolution. An optical microscope, in conjunction with an optical driving system, facilitates viewing and spin polarization of the color center ensemble. A magnetic field generator ensures biasing of the ensemble for better sensitivity, and a microwave driving system induces spin transitions within the ensemble. Actuation is controlled by a system responsive to force data or image data for precise positioning of the color center ensemble focally and in contact with a sample. The system generates a spatially resolved map of a magnetic field through analysis of fluorescence data. Methods for measuring and mapping fields with fiducials and force feedback are also included, enabling wide-field quantum sensing of irregular surfaces.