User Glossary

A “user” is someone who uses QGreenland in QGIS.

QGreenland Core

QGreenland Core is a large zip package curated to cover a broad variety of disciplines within a reasonable file size.

QGreenland Custom

QGreenland Custom is a QGIS plugin that enables users to download and use only the QGreenland layers they are interested in.

In the future, QGreenland Custom will be capable of downloading “modules”.

QGreenland Modules

QGreenland modules are subsets of the QGreenland layers intended for more targeted use. Modules include:

  • QGreenland Core: Covers a wide variety of disciplines and scientific needs. Curated to be useful for the largest number of users.

  • More coming soon…

Defined Terms

  • Attribute: Information about the components of a vector layer listed in tabular form. For example, a possible attribute of a point vector layer of cities is city name or population.

  • Coordinate Reference System (CRS): The system used to reference the x and y coordinates of a dataset.

  • Layer: A set of data and its symbology.

  • GeoPackage Layer: A collection of one or more data layers, including points, lines, and polygons, that are saved as a single file. A GeoPackage layer is an open format and platform-independent using SQLite.

  • Shapefile Layer: A proprietary vector layer format (points, lines, polygons) developed and regulated by Esri, but usable in QGIS.

  • SpatialLite Layer: A way to store an entire spatial database in one file; a spatial extension to SQLite, a relational database management system.

  • Temporary Scratch Layer: A temporary layer formed as a result of a spatial query of analysis that is discarded when QGIS is closed.

  • Virtual Layer: A specific kind of vector layer that results from an SQL query.

  • Layer Group: A collection of multiple layers that are related to one another.

  • Raster: A layer type consisting of grid cells or pixels, where each cell has a specified value.

  • Vector: A layer type consisting of either points, lines, or polygons, where each point, line, or polygon has a unique set of attribute values.