Caitlin Dempsey

Caitlin Dempsey is a geographer, writer, and founder and editor of Geography Realm. She holds bachelor's and master's degrees in Geography from UCLA and a Master of Library and Information Science (MLIS) from San José State University.

For more than two decades, she has written about geography, maps, geographic information systems (GIS), remote sensing, satellite imagery, and environmental science. Her work focuses on making geography accessible to a broad audience through articles, tutorials, and educational resources.

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What is the Oldest Surviving Aerial Photograph?

Caitlin Dempsey

The oldest surviving aerial photograph was taken on October 13, 1860 by James Wallace Black over the city of Boston.

Ground Movement in Norway

Caitlin Dempsey

Data from InSAR Norway has helped the  Geological Survey of Norway learn where there are areas of significant ground movement in both natural and urban areas of Norway.  

Mapping Where Norway is Moving

Caitlin Dempsey

Norway is using Copernicus Sentinel-1 data to detect ground movement across the country.

Mapping Out Ammonia Hotspots With Satellite Data

Caitlin Dempsey

Researchers recently used satellite data to create a high resolution map of ammonia hotspots around the world.  

How Much of the Earth is Covered by Clouds?

Caitlin Dempsey

Exactly how much of the world is covered in clouds?

Changes in Countries and Capital

Caitlin Dempsey

Listed here are more recently formed countries and capitals that have moved and well as some geography news items about some countries.

What Does Ultima Thule Mean?

Caitlin Dempsey

Ultima thule is Latin and has been used over to the centuries to refer to an area of the world that is the most distant and inaccessible.  

Screenshot showing the interface in QGIS to apply the new custom map projection, go to Project --> Properties.

How To Use the Equal Earth Projection With QGIS on the Mac

Caitlin Dempsey

Here are a few short steps to set up the Equal Earth map projection in QGIS.

Leaf map of Amsterdam, Nils Westergard

Hand Cut Paper Map of Amsterdam in the Shape of a Leaf

Caitlin Dempsey

Street artist Nils Westergard created this intricate map of the streets of Amsterdam in the form of a leaf cut out from paper with an X-Acto knife.

PACE: NASA’s Earth Observation Satellite to Launch in 2022

Caitlin Dempsey

NASA’s PACE (Plankton, Aerosol, Cloud, Ocean Ecosystem) is a planned earth observation satellite with an anticipated launch in 2022.

Using Christmas Trees for Habitat Restoration

Caitlin Dempsey

Upcycling Christmas trees helps to restore fish habitat, restore sand dunes, and supports native marsh grass growth.

This Remote Island Has the Highest Density of Trash in the World

Caitlin Dempsey

The remote island of Henderson Island is accumulating trash at a rate of 26.8 items per day. With over 671.6 items of debris per square meter along its beaches, this island has the highest density of trash in the world.

Geography Facts About the Mississippi Watershed

Caitlin Dempsey

The Mississippi watershed is the largest drainage basin in North America.

Photo of a Piping Plover on the sand.

The Foot-trembling Bird Gets the Worm

Caitlin Dempsey

Foot-trembling is a foraging technique used by some species of birds to find prey beneath the surface of the ground.

Lake Dukan. Photo: Alex Gerst, December 3, 2018

This Lake Looks Like a Christmas Tree

Caitlin Dempsey

The main body of Lake Dukan takes on a triangular shape that looks like a Christmas tree.

Various types and sizes of plastics collected from the Kinnickinnic River, Milwaukee, WI. Photo: S. Mason, State University of New York at Fredonia. Public domain. Source: USGS.

The 2018 Statistic of the Year is About Plastic Recycling

Caitlin Dempsey

90.5% of all plastics that have ever been produced have never been recycled.

Quickly Make a Map Poster From Any Urban Location on Earth

Caitlin Dempsey

Figuregrounder by Hans Hack is a fun tool that lets you create a simple map poster in seconds.

Free Urban Planning GIS Book and Exercises

Caitlin Dempsey

An open access book focusing on the use of GIS in sustainable urban planning and management includes six chapters containing exercises and GIS data.

3D Map of Puerto Rico’s Forest Shows How Hurricane Maria Reduced Tree Height

Caitlin Dempsey

Researchers who compared before and after LiDAR measurements of Puerto Rico's tropical forests found that Hurricane Maria damaged or uprooted 40-60% of the tallest trees.

Map showing legal land border (black dots) crossings between the United States and Canada. GIS data from: United States. Bureau of Transportation Statistics

Interesting Geography Facts About the US-Canada Border

Caitlin Dempsey

Here are some interesting geography facts about the Canada–United States border.

Layers of GIS Data

GIS Data

Caitlin Dempsey

GIS data info, exploring geographic data types (vector/raster), data errors, metadata, and online GIS data sources.

These Wolves in Minnesota are Very Very Territorial

Caitlin Dempsey

Researchers with the Voyageurs Wolf Project released maps showing 68,000 GPS-locations of seven wolves being tracked.  

Screenshot showing the Jane Goodall Snowflake cut out.

How to Make Map Ornaments and Geography Themed Christmas Decorations

Caitlin Dempsey

If you want to lend a geographic touch to your Christmas celebrations, check out these ingenious geography crafting ideas.

Using Satellite Imagery to Track Volcanic Ash Clouds

Caitlin Dempsey

Researchers have developed an algorithm that can distinguish between volcanic and non-volcanic clouds using high-resolution satellite imagery.

The Medieval Physician’s Almanac

Caitlin Dempsey

During the Middle Ages, the belief that spiritual and cosmological forces affected the body and mind was commonly accepted (BBC, ...

Using Machine Learning and Satellite Imagery for Street Address Generation

Caitlin Dempsey

Facebook and MIT Labs researchers have developed a method employing machine learning and satellite images to create street addresses in regions lacking unique building addresses.