Caitlin Dempsey
How Normalized Difference Water Index is Used to Map Flooding
The Normalized Difference Water Index (NDWI) is a calculation used in remote sensing to monitor and measure the amount of moisture in vegetation and surface water bodies.
Find Public GIS Data with Google’s Earth Engine Catalog
The Earth Engine Data Catalog lets users search and discover Earth observation public datasets.
Alviso Slough in the San Francisco Bay
The Alviso Slough in the San Franciso Bay is a restored salt marsh that lies in the path of the Pacific Flyway.
What is the Outlook for California’s Atmospheric Rivers?
During the winter months, atmospheric rivers carry enormous amounts of water to the state of California.
A Review of the State of Crowdsourced Geospatial Data
A review in the Journal of Remote Sensing provides an updated look at the benefits and concerns when it comes to collaborative geospatial data collection.
Using AI to Digitize Data From Scanned Maps
This AI-powered plugin is designed to automate the digitization of data from scanned maps and PDFs in QGIS for GIS users.
Learn How to Georeference a Map in QGIS Using GIS Data
Learn how to georeference scanned maps in QGIS using reference GIS data and control points when no coordinate grid is available.
The Coastline Paradox: Why Measuring Coastlines isn’t that Simple
The coastline paradox is the concept that the measured length of a coastline will change depending on the scale of the GIS data used for the measurement.
What is England’s Highest Mountain?
Found at 978 metres (3,209 ft) above sea level, Scafell Pike is located in Lake District National Park in Cumbria.
Sea Otters are a Keystone Species
Keystone species are plants or animals, like the sea otter, whose presence in an ecosystem plays a crucial role in its health.
Mapping Glacier Loss in Western Canada
Researchers are using remotely sensed data and satellite imagery to map glacier loss in Western Canada.
Teaching GIS to Kids to Help Them Learn Spatial Skills
Tips and resources to help you get started with teaching your children about GIS and mapping.
Geography of Penguins
Discover where penguins live, from Antarctic sea ice to tropical islands, and what shapes their geographic distribution.
GIS User Groups in the United States
GIS user groups are a great way to network with other GIS professionals on a local level. GIS user groups commonly are organized at the regional level.
Geography Facts About the Southern Ocean
The Southern Ocean is the Earth's windiest, southernmost ocean and plays a vital role in Earth's environmental health.
Exploring Rainbows and Moonbows
Rainbows and moonbows occur when light is refracted through drops of water in the sky.
What is Snowliage?
Snowliage is when an early winter storm creates a bright white snowfall that contrasts with the red, oranges, and yellow fall foliage of trees.
How to Track Santa Claus in 2023
Learn about the history of tracking Santa's Christmas travels and how to follow Santa using NORAD's app.
GIS Tutorials
Online GIS tutorials from Geography Realm for mapping and data analysis.
Monarch Butterfly Overwintering in California
November and December are the best times to see large clusters of monarch butterflies overwintering in the coastal groves of California.
U.S. States With the Most Extreme Elevation Spans
Here are the states with the greatest difference in elevation between the highest and lowest points.
Study: More U.S. Homes Burn in Grassland and Shrubland Fires than Forest Wildfires
A new study in Science reports that in the United States, grassland and shrubland fires tend to be more extensive and burn more houses than forest fires.
What is the Difference Between a Crow and a Raven
Here are some ways you can determine the difference between the common raven (Corvus corax) and the American crow (Corvus brachyrhynchos).
Study: Human Activities Have Changed How Wolves Hunt Deer
Logging, linear features, and human infrastructure are changing where wolves hunt for deer.