# Glossary for Geospatial Science

### Technical vocabulary defined by MicroImages

**Glossary**

**principal components:** A statistical technique for reducing an image’s dimensionality. Principal components chooses uncorrelated linear combinations of a set of rasters in such a way that each successively extracted linear combination, called a principal component, has a smaller variance. If the rasters have significant linear intercorrelations, the first few components will account for a large part of the total variance.