Caitlin Dempsey

Caitlin Dempsey is the editor of Geography Realm and holds a master's degree in Geography from UCLA as well as a Master of Library and Information Science (MLIS) from SJSU.
Map showing the location of Alert, Canada. Data from, map by Caitlin Dempsey.

What to Know About Absolute and Relative Location

Caitlin Dempsey

Understand absolute and relative location: absolute uses coordinates or fixed points, while relative describes a place in relation to another location.

A white sign with black writing indicating it's a witness post.

Witness Posts

Caitlin Dempsey

Witness posts are signs that alert visitors to the presence of a nearby survey marker.

An abnormal growth of leaves in a conifer tree.

Witch’s Broom in Trees: Dense Clump of Leaves and Branches

Caitlin Dempsey

Witch's broom affects trees like birch, spruce, and pine, causing dense twig and leaf clusters due to pathogens, parasites, and environmental stressors.

A map of the southwest region of the US showing in deep red extreme heat across the area.

Mapping Heatwaves from Space: How Extreme Temperatures Are Modeled

Caitlin Dempsey

The Goddard Earth Observing System (GEOS) model can help researchers predict and map heatwaves around the world.

Side by side satellite images of a glacier in 1988 and 2015 showing the glacier shrinking.

Venezuela Becomes the First Country to Lose its Glaciers

Caitlin Dempsey

Venezuela became the first country to lose all of its glaciers as the last remaining ice on Pico Humboldt shrank to less than two hectares.