Rangefinding is the methodology and technical discipline concerned with the determination of the distance to an object or target. It encompasses the study, development, and application of various techniques, including optical (e.g., stadiametric, triangulation) and electronic (e.g., laser, radar) methods, for accurately quantifying spatial separation. Research in rangefinding focuses on enhancing precision, extending operational range, achieving miniaturization, and facilitating integration with other sensor systems, critical for applications ranging from surveying and military operations to photography, industrial measurement, and autonomous navigation, thereby significantly contributing to situational awareness and operational effectiveness.