Articles

Side by side satellite images, one before a tornado, and one after a tornado.

Mapping Tornado Tracks with Satellite Data

Mark Altaweel

Researchers used satellite imagery and remote sensing to map tornado tracks.

A view of the Americas from a satellite image.

How the Earth’s Terminator Changes With the Seasons

Caitlin Dempsey

The Earth's terminator is the shifting boundary dividing day and night as a result of our planet's rotation and its position relative to the Sun.

Map within ArcGIS Pro showing the results of a calculation of which populations are at risk of air pollution in Florida.

How to Use ArcGIS Pro to Determine the Population Impacted by Air Pollution

Jeff Oppong

Learn to estimate air pollution's impact on people with geospatial methods using ArcGIS Pro and data from Toxic Release Inventory, Worldpop, and ArcGIS Hub.

Free Ways to Learn QGIS

Caitlin Dempsey

If you want to start learning how to use QGIS, a free and open source GIS software package, there are some excellent free resources out there. 

An image on the left of a street view and a black and white image on the right with white representing areas of vegetation from the street image.

Green View Index for QGIS

Alexandros Voukenas

Green View Index is a QGIS plugin that uses street-level imagery to measure the amount of vegetation visible to the human eye.

Healthy vegetation absorbs more and reflects more green light. Photo: Caitlin Dempsey.

Using Open GIS Data to Map Public Urban Green Spaces

Mark Altaweel

Learn how OpenStreetMap and Sentinel-2 satellite imagery are combined to accurately identify public urban green spaces for GIS analysis and planning.

The top satellite image shows the snowpack in the Sierras in California in 2022. The bottom satellite image shows the snowpack in the Sierras in 2023.

Snowmelt is Starting in California’s Sierra Nevada Mountains

Caitlin Dempsey

Due to colder weather and more strong atmospheric rivers, the 2023 Sierra Nevada snowpack levels in California are significantly above average.

Laptop with QGIS, a desktop GIS software program

Networking in GIS: Peer-to-Peer Support in the GIS Community

Caitlin Dempsey

List of peer-to-peer resources that GIS professionals can tap into for assistance with their technical queries and to connect with others in the field.

Painted lady butterfly with wings spread while feeding on a clover flower at Bear Creek Redwoods Open Space Preserve, California.

Painted Lady Butterflies Have the World’s Longest Known Migration

Caitlin Dempsey

Learn how painted lady butterflies complete the world's longest known butterfly migration, traveling up to 9,000 miles between Europe and Africa.

A gray shaded relief map with a rainbow categorization showing the densities of sargassum in the Atlantic Ocean.

Sargassum in the Atlantic Ocean Reaches a New Spring High

Caitlin Dempsey

Researchers using remote sensing data from NASA's Aqua and Terra satellites have measured the largest ever March density in the Great Sargassum Belt.

A faded aerial map with red, green, and blue areas indicating 3 minute drive times for a city.

GIS for Local Government: Economic Development and Site Selection

Maptitude

This GIS tutorials shows how to use Maptitude in the municipal government sector for economic development and site selection.

A view from a plane at a snow covered mountain with conifer trees in the Sierras.

Mapping Snowpack and Forecasting River Rise in California

Mark Altaweel

Measuring snow and forecasting snowmelt effects on river rise is important for planning for California's water needs and to mitigate flooding.

A faded aerial with blue lines for water mains, blue dots for water meters, and brown for sewer lines.

GIS for Local Government: Public Works

Maptitude

This article by Stewart Barry and Brett Lucas describes an application of Maptitude in the municipal government sector for public works.

A picture of a brown turtle with its head raised sitting in shallow water surrounded by mud and plant stems.

Wildlife Conservation in the Face of Climate Change: The Importance of Protected Areas

Mark Altaweel

Protected areas are important for providing refuge to amphibians and reptiles impacted by climate change.

A shaded relief map of the Central Valley in California showing the location of Tulare Lake.

How California’s Ancient Tulare Lake Reappears

Caitlin Dempsey

Tulare Lake used to be the largest freshwater lake west of the Mississippi.

Map showing the standard time zones for the entire world. PDF with a higher resolution. Map: CIA, 2018, public domain.

Which Country Has the Most Time Zones?

Caitlin Dempsey

Find out which country has the most time zones and how many countries in the world have at least two time zones.

Laptop with QGIS, a desktop GIS software program

Learn GIS for Free

Caitlin Dempsey

There are a few online options to learn GIS for free. Take advantage of resources that provide you access to free courses from some of the world's best universities and institutions.

QGIS on a laptop. Image: Caitlin Dempsey

How to Learn GIS

Caitlin Dempsey

There are many ways to learn GIS. Listed here are guides to learn GIS in a classroom, online, or through self-guided methods.

Finding the Right GIS Program

Caitlin Dempsey

Choosing the right GIS educational program to set you on the right path towards a GIS career, so be sure to consider all your options before making a decision.

Map showing the Indian Ocean, Oman Sea, and the Red Sea. Map: Epmistes, MediaWiki Commons.

What is the Difference Between a Sea and an Ocean?

Caitlin Dempsey

A look at the geographic definitions of oceans and seas.

A circular map of the world centered on the North Pole. The oceans are blue and the land masses are green and brown.

Types of Map Projections

Elizabeth Borneman

Map projections are used to transform the Earth's three-dimensional surface into a two-dimensional representation.

Badwater Basin, Death Valley National Park. Photo: NPS, public domain.

Why Salt Flats Have a Honeycomb Pattern

Caitlin Dempsey

Recently published research explains the scientific reason behind the honeycomb shapes found in salt flats.

Side by side maps showing a UTM file with zones and rows and a UTM grid file with just the zones.

Dissolve Features Based on Attribute in QGIS

Caitlin Dempsey

This GIS tutorial provides a step-by-step guide on how to dissolve features in QGIS based on an attribute field.

A girl with a white sweatshirt and black leggings dances in the shallow water of the beach by the ocean. Her back is to the camera and the sun is shining with a clear blue sky.

Oceans Produce Half of the World’s Oxygen

Caitlin Dempsey

The oceans produce over half of the oxygen in the Earth's atmosphere, making them a vital source of oxygen for life on our planet.

A heat map showing density of crimes over a street map.

GIS for Local Government: Public Safety

Maptitude

This GIS tutorial from Maptitude shows users how to map out crime and demographics.

A shaded relief map highlighting Alaska and the lower 48 states with the surrounding countries muted with a semitransparent white overlay.

A to Z Geography: United States

Caitlin Dempsey

The geography of the United States is diverse, featuring rugged mountains, arid deserts, dense forests, and expansive coastlines.

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