unif - vect
- Unified Modeling Language
- uniform distribution
- union
- unique value renderer
- United States Geological Survey
- Universal Description, Discovery, and Integration
- Universal Time
- universal transverse Mercator (projection)
- Universally Unique Identifier
- universe
- universe polygon
- unscaled map
- unsigned
- unsplit
- unsupervised classification
- unsupervised training
