A geographic information system (GIS) collects, manages, analyzes, and displays data linked to locations.
Definition
GIS is a system for working with information tied to places. Civil engineering firms use it for tasks such as mapping utilities, organizing asset inventories, screening sites, supporting planning, and presenting infrastructure data. A GIS effort can include data collection, conversion, coordinate system setup, analysis, map production, and documentation. Scope and fee depend on the sources, required accuracy, intended use, and who supplies and maintains the data. Some firms track GIS work as a specialist service, while others include it within broader project tasks. GIS is not automatically a survey, a verified record of field conditions, or proof that mapped features are complete. Results depend on source quality, coordinate systems, field methods, and limits on use. A map that supports planning may not be suitable for staking, design, or property decisions without the required verification. See NIST for information on measurement and data standards relevant to technical work.
How owners use it
- Scope data sources, coordinate reference, accuracy needs, and intended uses before pricing GIS work.
- Track data preparation and analysis effort separately when the work spans multiple projects.
- Example: 12 field-data hours + 8 mapping hours = 20 GIS production hours.
