Underground utility mapping requires access to the project site and the areas where buried infrastructure needs to be identified. Before mapping begins, it is helpful to provide site plans, existing utility records, construction drawings, property information, previous surveys, and details about known underground utilities. These documents help technicians understand the site and determine the appropriate mapping approach.

Depending on the project, technicians may use electromagnetic locating equipment, Ground Penetrating Radar (GPR), GPS/GNSS technology, GIS software, and other specialized detection tools. These methods can help identify and document electrical lines, gas lines, water pipes, sewer systems, telecommunications cables, irrigation lines, and other detectable underground infrastructure. The collected information can include utility alignment, location, access points, and other relevant features.

For the best results, the site should be accessible and reasonably clear of obstructions, with the project boundaries and required mapping areas clearly identified. After field data is collected, it can be organized into detailed utility maps or digital GIS records. Proper preparation helps make underground utility mapping efficient, organized, and useful for construction planning, excavation, engineering, and infrastructure management.