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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Camels Now Part of Google’s Street View Imagery Program

Caitlin Dempsey

Google uses many different ways to capture its growing street level imagery, including using trikes, snowmobiles, and trolleys.  Most recently, ...

The far left map is the original hand-drawn map, which was used to make the two printed version on the right which were used by Napoleon and his army at Waterloo. In the original map, the Mont Saint-Jean farm is situated to the right of the road, while on the printed versions, the farm is shown as being to the left of the road.

Was an Inaccurate Map Partly Responsible for Napoleon’s Waterloo Defeat?

Caitlin Dempsey

A French documentary filmmaker argues that a cartographic mistake played a significant role in Napoleon's army succumbing to defeat by the Duke of Wellington's forces in the Battle of Waterloo.

How Does a Degree in GIS Affect How You Feel About Your Career?

Caitlin Dempsey

Salary site payscale.com released the results of its 2014 college survey that looks at which college majors pay the best and are ...

New seafloor map: view of the Atlantic showing earthquakes (red dots), seafloor spreading ridges, and faults.

New Detailed Map of the Ocean Floor

Caitlin Dempsey

More than two-thirds of the earth’s surface is covered by deep oceans, yet researchers know one hundred times more about ...

Work on “Inner GPS” in the Brain Wins Nobel Prize in Medicine

Caitlin Dempsey

Over the course of three decades, two separate research efforts helped unwrap the questions of “how does the brain create ...

Simple map with blue for the thousands of Minnesota hydrographical features in deep blue against a white background.

How Many Lakes are There in the World?

Caitlin Dempsey

Using high-resolution satellite images, researchers created the GLObal WAter BOdies database (GLOWABO), which includes all lakes larger than 0.002 km2.

Satellite image of the Great Lakes with brown ground and a scattering of snow to the north.

GLOWABO – Remotely Sensed Inventory of the World’s Lakes

Caitlin Dempsey

A team of researchers used remote sensing techniques to calculate the number of lakes in the world.

London from above in GB Minecraft 2.0. Source: Ordnance Survey.

Improved and More Realistic Minecraft Map of Great Britain

Caitlin Dempsey

An improved Minecraft map of Great Britain has been released by the Ordnance Survey.

Changes in Earth’s gravity field resulting from loss of ice from West Antarctica between November 2009 and June 2012 (mE = 10–12 s–2). A combination of data from ESA’s GOCE mission and NASA’s Grace satellites shows the ‘vertical gravity gradient change’.

Measuring Small Variations in the Earth’s Gravity

Caitlin Dempsey

The NASA–German Grace satellites were launched in May of 2002 in order to map variations in Earth's gravity field.

Carbon dioxide emissions increased in East Asia (right) at an average rate of 9.8% per year from 2003 to 2011, but nitrogen oxides increased by ‘only’ 5.8% per year. This indicates a use of cleaner technology in East Asia. North America and Europe, however, show slightly decreasing trends for both gases. The maps show the corresponding spatial pattern as obtained from the satellite data: red corresponds to regions with high values of NOx and CO2, while blue indicates background values. Source: University of Bremen.

Measuring Carbon Dioxide and Nitrogen Dioxide Trends with Remote Sensing

Caitlin Dempsey

Researchers from the University of Bremen published in Nature Geoscience the results of an effort to implement a top-down approach using data acquired remotely.

This overlay showing WGS 84 Ellipsoid Mercator in Blue and the Spherical Web Mercator in Red WGS 84 highlights the spatial inaccuracies of the latter projection.

National Geospatial-Intelligence Agency’s Web Mercator Advisory Notice

Caitlin Dempsey

The National Geospatial-Intelligence Agency (NGA) has an advisory notice warning about errors in the widely used Web Mercator map projection.

Aral Sea Continues to Shrink

Caitlin Dempsey

Once the  fourth-largest inland water body in the world, the Aral Sea shrank again in 2013

Caused by Monarch butterflies in flight?

Mass Movements So Large You Can See Them on Radar

Caitlin Dempsey

The U.S. National Weather Service in Saint Louse, Missouri recently reported that a butterfly shaped pattern on its radar was the result of... butterflies.

Is GIS Use in Crime Analysis Effective at Curbing Crime?

Caitlin Dempsey

A new study by researchers at Sam Houston State University found that the use of GIS is widespread in analyzing crime ...

Tracking the Evolution of the Field of Geography over 124 Years and 10,290 Dissertations

Caitlin Dempsey

Kent State University professors David Kaplan and Jennifer Mapes have undertaken a study to understand how academic research in the field of geography has evolved in the United States.

Global fossil fuel CO2 emissions as represented by the Fossil Fuel Data Assimilation System (FFDAS).

Mapping Global Carbon Dioxide Emissions

Caitlin Dempsey

Researchers recently published the results of developing a system for measuring global carbon dioxide (CO2) emissions in the Journal of Geophysical ...

How Much do Geographers Make?

Caitlin Dempsey

Geographers find work in a variety of disciplines both in the physical and human geography related fields.  Geographers are employed ...

A map of New Netherlands and New England created by Dutch cartographer Willem Blaeu has a west orientation, 1635.

Map Orientation

Caitlin Dempsey

Maps have not always been orientated northward. Different regional and religious forces have influenced the orientation of maps over time.

Landsat-derived forest disturbance rate (stand replacing), 1990-2000, aggregated to 500m grid. Source: NASA.

Mapping Forest Disturbance with Landsat

Caitlin Dempsey

The Landsat Ecosystem Disturbance Adaptive Processing System (LEDAPS) takes advantage of the 30 year Landsat archive to inventory recent disturbances and forest-cover change.

Mapping Iceland’s Bárðarbunga (Bardarbunga) Volcanic Eruption

Caitlin Dempsey

The second highest mountain in Iceland has been exhibiting heightened activity since mid-August. As a results causing thousands of local ...

Some Common Spatial Analysis with Raster Data

Caitlin Dempsey

Spatial coincidence, proximity, surface analysis, dispersion, and least-cost path analysis are some common spatial analysis done with raster GIS data.

Number of check-ins throughout the hours of the day in different countries (WD = weekday; WE = weekend).

Using Social Media to Track Global Eating Habits

Caitlin Dempsey

According to researchers, social media can be used to track and understand eating habits from around the world.  These researchers ...

How to Make a Map from a Shapefile Using Google Fusion Tables

Caitlin Dempsey

This tutorial shows you how to make a map in Google Fusion Tables with shapefile data.

How to Make a Map with Excel Data Using Google Fusion Tables

Caitlin Dempsey

This article will take you though a step-by-step example of using an Excel spreadsheet that contains location information to make a map using Google Fusions Table.

Geography of Car Thefts in the United States

Caitlin Dempsey

The National Insurance Crime Bureau (NICB) each year takes a look at the national picture in terms of car thefts. 

Vredefort Dome, Free State, South Africa.

Geography of Impact Craters

Caitlin Dempsey

According to the Earth Impact Database, there are currently 184 verified impact craters that have been documented on Earth.