4. Measuring Area in Digital Images
2018-02-22. Drones in Geoscience Research: The Sky Is the Only Limit.By Christa Kelleher, Christopher A. Scholz, Laura Condon, and Marlowe Reardon, Eos/AGu.

2010 August 2. One Picture Post is Worth A Thousand Pictures: OR How Can Outdoor Digital Photographers Become Citizen Scientists Who Participate in Environmental Monitoring. By Jeffrey Beaudry et al, Earthzine. Excerpt: …Picture Post is a project aimed at involving citizens in local environmental monitoring by 1) taking digital photographs at a designated Picture Post site in a consistent, sequential order, 2) uploading the digital photographs to the Picture Post website, 3) examining the digital photographs using the image analysis tools on the Picture Post website, 4) continuing to take photos on a regular weekly basis, and 5) sharing digital photographic records with local community organizations dedicated to environmental monitoring and use.
…The selection of a Picture Post site is a fascinating way to make the connection with your environment and your community…Try to create a collaboration between informal science (e..g., parks, Audubon Society, trail management groups) with formal science education (e.g., public and private schools, colleges, and universities).
…As of July 2010 there were thirty Picture Posts. To locate current sites, the Picture Post website has an interactive Google map which begins with North America and expands world-wide. The longitude and latitude and a thumbnail photograph of each Picture Post is given…
…The Picture Post team hopes to add more tools to the website, including one that will provide quick indicators of plant health, as well as the virtual Picture Post, which will use the Android mobile operating system to take pictures and reference them precisely with an “onion skin” tool on the phone.
(You can view an example of Picture Post photos taken at Seacoast Science Center Picture Post in Rye, NH, here).

2009 June 30. Most complete Earth map published. BBC News. Excerpt: The most complete terrain map of the Earth's surface has been published. The data, comprising 1.3 million images, come from a collaboration between the US space agency Nasa and the Japanese trade ministry. The images were taken by Japan's Advanced Spaceborne Thermal Emission and Reflection Radiometer (Aster) aboard the Terra satellite.
The resulting Global Digital Elevation Map covers 99% of the Earth's surface, and will be free to download and use.
..."This is the most complete, consistent global digital elevation data yet made available to the world," said Woody Turner, Nasa programme scientist on the Aster mission.
...Previously, the most complete such topographic map was Nasa's Shuttle Radar Topography Mission, covering 80% of the Earth's surface. However, the mission's results were less accurate in steep terrain and in some deserts. Nasa is now working to combine those data with the new Aster observations to further improve on the global map....

Earth Exploration Toolbook -- provides step-by-step instructions for using Earth science datasets and software tools in educational settings. Each chapter of the EET walks users through an example-a case study in which the user accesses data and uses analysis tools to explore issues or concepts in Earth system science. In each chapter, users produce and analyze maps, graphs, images, or other data products.

Chesapeake Bay from Space The site contains a wide variety of remote sensing data and tools designed to introduce decision makers to the use and interpretation of Landsat 7 imagery, with a primary focus on imagery used to measure the extent of impervious surfaces in the Chesapeake Bay and Maryland Coastal Bays Watersheds.