Articles

Drone with ground-penetrating radar system flying close over river surface. Photo: John W. Lane, USGS. Public domain.

New Developments in UAVs

Mark Altaweel

2021 promises new changes that are set to shakeup UAVs and their use in future years.

Plentiful rains leads to superblooms where the desert becomes blanketed with wildflowers. Photo: Death Valley, NPS, spring 2005.

Geography Facts About Death Valley

Caitlin Dempsey

Learn some interesting geography facts in this article about Death Valley.

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

The Lowest Point in Every U.S. State

Caitlin Dempsey

This article takes a look at the lowest elevation point in every state in the U.S.

The color of water is a by product of how light is absorbed. Mangrove islands bespeckle the bay in upper Lostman's River. Photo: Paul Nelson, U.S. Geological Survey. Public domain.

Rivers in the United States are Changing Colors

Caitlin Dempsey

A team of researchers analyzed Landsat images over a 38-year period and found that a significant number of large U.S. rivers are changing colors.

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

Geography of Time Zones

Elizabeth Borneman

A time zone is a region of the Earth that uses the same standard time, which is commonly referred to as the local time.

The natural oasis of Huacachina in Peru. Image: Landsat 8, NASA, public domain.

South America’s Only Natural Oasis

Caitlin Dempsey

Located in the sand dunes in southwestern Peru on edge of the Atacama desert is the only natural oasis in the continent of South America.

Diagram showing WebGIS architecture. Adapted from Emmanuel Jolaiya.

WebGIS Section 3: Architecture

Emmanuel Jolaiya

Emmanuel Jolaiya explains the architectural workflow of a WebGIS.

The OpenLayers site hosts many examples of the library in use. Screenshot from OpenLayers showing calculated shaded relief from elevation data.

Openlayers: Geospatial JavaScript Library

Mark Altaweel

One of the most under-utilized programming languages in geospatial analysis and processing is JavaScript.

The 3-way switch on a backpack sprayer handle. Photo: Harley Schinagl

Automatic and Efficient Data Logging of Weed Management Activities

Geo Contributor

Harley Schinagl, the developer of STA logger, write about how this geospatial hardware is designed for conservation and land management fields.

The growth of the crack on the Brunt Ice Shelf. Change detection satellite images courtesy of EOS Data Analytics

A View of 2020 from Space

Geo Contributor

EOS Data Analytics, an AI-powered satellite analytics platform, shares satellite imagery that highlights some of the environmental tragedies that occurred in 2020 — California and Colorado fires, Hurricane Laura, Kamchatka spill, Norilsk oil spill, and the Calving on the Brunt Ice Shelf.

Cover of 'The Eternal City: A History of Rome in Maps"

Review | The Eternal City: A History of Rome in Maps

G.T. Dempsey

When you finish this delight of a book, you feel that the history of the mapping of Rome can stand as the very paradigm of the history of pre-digital cartography itself.

Logos of open source GIS and WebGIS tools.

Businesses Using Open Source GIS

Mark Altaweel

Businesses are using open source GIS software, finding that there are a lot of benefits along the way.

U.S. Geological Survey streamflow-gaging station 08028500 Sabine River near Bon Wier, Texas. Photo: USGS, public domain.

The World’s Human-Made Materials Weigh as Much as All Life on Earth

Caitlin Dempsey

Researchers have calculated that 2020 is the year that the mass of human-made materials exceeded the mass of all living organisms on Earth.

Landsat 8 false-color image of the Sea of Galilee. Image: NASA, acquired October 27, 2020.

The Sea of Galilee’s Water Levels are on the Rise

Caitlin Dempsey

Heavy rains have helped the water level in the Sea of Galilee to rebound.

Von Thunen's model of agricultural use.

Von Thünen Model of Agricultural Land Use: An Overview

Mark Altaweel

German geographer Johann Heinrich von Thünen created one of the first geographical models related to agricultural land use.

Retreating glacier south of Mt. Pendleton in Denali National Park, Alaska, with runoff from glacial melt seen in the foreground. Photo: Dennis G. Dye, U.S. Geological Survey. Public domain.

The Use of Gravimetry Satellites for Measuring Ice and Sea Level Change

Mark Altaweel

Satellites now allow researchers to make more accurate mass measurements to large areas covered by ice and understand the effects of snow and ice melt on sea level change.

Time in Maps book cover

Review: Time in Maps

G.T. Dempsey

Time in Maps is a sumptuously-illustrated large-sized book that serves as a celebration of the development of GIS.

A black and white dot map showing ZIP codes in the continental United States.

Understanding and mapping ZIP Codes

Caitlin Dempsey

Resources for accessing ZIP code data. Ben Fry has created zipdecode that shows the location of all the ZIP codes in the United States.

Equal Earth map projection with vector country boundaries © Caliper Corporation

Using Map Projections with Maptitude

Maptitude

Stewart Berry discusses how Maptitude works with different map projections.

Planting a longleaf pine seedling, Big Thicket National Preserve. Photo: NPS, public domain.

Mega Tree Planting Efforts Around the World

Katarina Samurović

As a response to the global deforestation crisis, many countries, organizations, and influencers have started mega-tree planting projects.

Researchers from the University of Santa Cruz, California, used Picterra to detect and count sea lions and seals living on Año Nuevo Island from imagery. Source: Picterra.

Machine Learning and Object Detection in Spatial Analysis

Mark Altaweel

Picterra offers a relatively easy to use interface that allows users train AI on satellite and aerial imagery to detect features.

Free Online Geocoder

Caitlin Dempsey

Online geocoder services will generate latitude and longitude coordinates for a list of addresses.

Logos of open source GIS and WebGIS tools.

WebGIS Section 2: Overview of Tools and Technologies For WebGIS

Emmanuel Jolaiya

This article introduces you to some of the open-source tools used in WebGIS.

Screenshot from GRASS showing part of the user interface. Source: grass.osgeo.org

Why GRASS Delivers Powerful GIS Capabilities

Mark Altaweel

A recent MapScaping podcast with Markus Neteler, chairman on the GRASS GIS Project Steering Committee, makes it is clear that GRASS will continue to be a powerful GIS open source effort for years to come.

An agriculture field in California. Photo: U.S. Geological Survey. Public domain

Geospatial Technology and Challenges of Contemporary Agriculture

Mark Altaweel

Farmers have greater access to geospatial tools that can help mitigate some agricultural challenges.

WebGIS Section 1 – A Quick Introduction to GIS and WebGIS

Emmanuel Jolaiya

In section 1 of this series on WebGIS, Emmanuel Jolaiya provides readers with an overview of GIS and WebGIS.