Articles

Satellite imagery of an atoll.

Geography of Atolls

Caitlin Dempsey

Atolls are ring-shaped coral reefs, islands, or a series of islets that encircle a lagoon either partially or completely.

A small brown bird holding a small caterpillar.

How Inequality Affects Urban Wildlife

Mark Altaweel

More access to green space and mature trees in wealthier neighborhoods in the United States has also led to a greater diversity of wildlife in those areas.

A view of tall eucalyptus trees in a forest.

The Role of Secondary Forests in Reducing Atmospheric Carbon

Mark Altaweel

Secondary forests play an important role in carbon capture strategies aimed towards reducing atmospheric carbon.

World map created in 1514 by Oronce Fine (1494–1555) who was one of the first French scholars to work with cartography.

Cordiform: Heart-Shaped Map Projections

Caitlin Dempsey

Heart shaped map projections are known as cordiform map projections which is derived from the Latin "cor" for heart and form for shape.

A satellite image of a storm along the east coast of the United States.

Nor’easter Storms in the United States

Caitlin Dempsey

Nor'easters are powerful storms that bring heavy snowfall to the East Coast of the United States, primarily between September and April.

Photo of a mountain lion walking on a rock.

Using GIS to Map an Individual Animal’s Home Range

Caitlin Dempsey

GIS can be used to map the estimated home range based on the collected point locations of individual animals as they move through an environment.

A satellite imagery that has NDWI calculations in blue to show the extent of flooding.

How Normalized Difference Water Index is Used to Map Flooding

Caitlin Dempsey

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.

Google's Earth Engine Data Catalog lets users discover public geospatial datasets.

Find Public GIS Data with Google’s Earth Engine Catalog

Caitlin Dempsey

The Earth Engine Data Catalog lets users search and discover Earth observation public datasets.

A small sparrow clings to a reed.

Alviso Slough in the San Francisco Bay

Caitlin Dempsey

The Alviso Slough in the San Franciso Bay is a restored salt marsh that lies in the path of the Pacific Flyway.

A map showing moisture levels carried by an atmospheric river over the West Coast including California. High moisture levels are a dark blue-green and low moisture levels are brown.

What is the Outlook for California’s Atmospheric Rivers?

Caitlin Dempsey

During the winter months, atmospheric rivers carry enormous amounts of water to the state of California.

Photo taken from an aircraft looking down at a heart-shaped glacier that is breaking off.

Measuring Greenland’s Ice Loss

Mark Altaweel

More accurate geospatial methodologies for measuring ice loss in Greenland indicate that existing approaches may not fully capture the scale of ice melt.

PurpleAir provides crowdsourced air quality measurements.

A Review of the State of Crowdsourced Geospatial Data

Caitlin Dempsey

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.

A completed polygon that has been digitized with artificial intelligence from a map.

Using AI to Digitize Data From Scanned Maps

Caitlin Dempsey

This AI-powered plugin is designed to automate the digitization of data from scanned maps and PDFs in QGIS for GIS users.

A view of the QGIS map canvas with a scanned map overlaying OpenStreetMap street data.

Learn How to Georeference a Map in QGIS Using GIS Data

Caitlin Dempsey

Learn how to georeference a map using GIS data in QGIS with this step-by-step tutorial.

Photo of the coastline of Acadia National Park.

The Coastline Paradox: Why Measuring Coastlines isn’t that Simple

Caitlin Dempsey

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.

A view of a green covered mountain with misty clouds in the foreground.

What is England’s Highest Mountain?

Caitlin Dempsey

Found at 978 metres (3,209 ft) above sea level, Scafell Pike is located in Lake District National Park in Cumbria.  

A raft of sea otters. Photo: USFWS, public domain

Sea Otters are a Keystone Species

Caitlin Dempsey

Keystone species are plants or animals, like the sea otter, whose presence in an ecosystem plays a crucial role in its health.

A grayscale shaded relief map of the western part of Canada with red areas on top showing glaciers.

Mapping Glacier Loss in Western Canada

Caitlin Dempsey

Researchers are using remotely sensed data and satellite imagery to map glacier loss in Western Canada.

Map showing a gradient from bright yellow to deep red to show increase or decrease.

Change Detection Using Kernel Density Analysis in ArcGIS Pro

Jeff Oppong

This GIS tutorial provides step-by-step instructions for how to use two point datasets to detect changes in ArcGIS Pro using kernel density.

An AI generated drawing showing four kids at a long table looking at maps on a screen.

Teaching GIS to Kids to Help Them Learn Spatial Skills

Caitlin Dempsey

Tips and resources to help you get started with teaching your children about GIS and mapping.

An oblique view of Hawaii showing two snow-capped volcanoes.

Snow in Hawaii

Caitlin Dempsey

Hawaii may be in the tropics, but it gets snow every year.

A screenshot showing a georeferenced map on top of a satellite image of the Nile River area.

Georeferencing Scanned Maps in QGIS Using Graticules

Jeff Oppong

This GIS tutorial teaches you how to assign geographic coordinates to a scanned map in QGIS using a process known as georeferencing.

A shaded relief map centered on Antarctica with different colored circles for the different types of penguin nesting sites.

Geography of Penguins

Caitlin Dempsey

Penguin are agile swimming birds with habitat that ranges from Antarctica to the Galapagos Islands.

Introduction to GIS

Caitlin Dempsey

GIS is a technological field that incorporates geographical features with tabular data in order to map, analyze, and assess real-world problems.

A couple of small white boats on a hazy day out in the ocean with the coastline in the background.

Mapping Human Activities in the Oceans

Mark Altaweel

Geospatial technologies are being used to map human activities in our oceans, from fishing to transport.

A screenshot showing green gradient elevation points on top of a raster layer with a yellow to dark red elevation gradient.

Using interpolation to create a surface layer with contours in QGIS

Jeff Oppong

This GIS tutorial shows you how to find elevation data points and create a surface layer and contours using QGIS.