In the context of rapid urbanization and industrialization, land filling for infrastructure development is the most critical initial step of any project. However, it also brings challenges related to quality control, material quantification, and environmental protection. The service of surveying and assessing the location, area, and volume of backfill solid materials acts as a “technical arbitrator,” ensuring transparency, accuracy, and legal compliance. The assessment results serve as an important basis for state management, dispute resolution, and inspection of compliance with regulations on land, construction, and environmental protection.