Scientists Use Google Earth and Crowdsourcing to Map Uncharted Forests
By Katie Fletcher, Tesfay Woldemariam and Fred Stolle
No single person could ever hope to count the world's trees. But a crowd of them just counted the world's drylands forests—and, in the process, charted forests never before mapped, cumulatively adding up to an area equivalent in size to the Amazon rainforest.
Current technology enables computers to automatically detect forest area through satellite data in order to adequately map most of the world's forests. But drylands, where trees are fewer and farther apart, stymied these modern methods. To measure the extent of forests in drylands, which make up more than 40 percent of land surface on Earth, researchers from UN Food and Agriculture Organization, World Resources Institute and several universities and organizations had to come up with unconventional techniques. Foremost among these was turning to residents, who contributed their expertise through local map-a-thons.
Technical Challenges, Human Solutions
Traditional remote sensing algorithms detect tree cover in a pixel rather than capturing individual trees in a landscape. That means the method can miss trees in less-dense forests or individual trees in farm fields or grasslands, which is most often the nature of dryland areas.
Google Earth collects satellite data from several satellites with a variety of resolutions and technical capacities. The dryland satellite imagery collection compiled by Google from various providers, including Digital Globe, is of particularly high quality, as desert areas have little cloud cover to obstruct the views. So while difficult for algorithms to detect non-dominant land cover, the human eye has no problem distinguishing trees in the landscapes. Using this advantage, the scientists decided to visually count trees in hundreds of thousands of high-resolution images to determine overall dryland tree cover.
Local Map-a-thons Using Collect Earth
Armed with the quality images from Google that allowed researchers to see objects as small as half a meter (about 20 inches) across, the team divided the global dryland images into 12 regions, each with a regional partner to lead the counting assessment. The regional partners in turn recruited local residents with practical knowledge of the landscape to identify content in the sample imagery. These volunteers would come together in participatory mapping workshops, known colloquially as "map-a-thons."
To lay the groundwork for the local map-a-thon events the team identified both an entry point, usually a university, that could help recruit participants, as well as a facility with the capacity and internet to host the map-a-thon. Once trained, any given analyst could identify 80 to 100 plots per day.
Example of Collect Earth grid set for data collection.
Quality control was carried out afterwards by comparing the identified land cover with the number of trees counted. For example, if a local participant identified an image as having just three trees but later identified the same image as forest, the researchers knew there was human error and further review was required.
The Collect Earth tool allows users to navigate between multiple windows and select the best imagery for each particular data point.
These map-a-thons were designed so that people with first-hand knowledge of local landscapes could participate. No knowledge of remote sensing or any technology beyond internet literacy was required. The expertise needed was the understanding of regional landscape and land use. This practical knowledge of the region was critical as the participants were not only able to count individual trees but also identify the type of land use and trees they saw on the Google Earth images.
This research only "discovered" new forest in the sense that Columbus "discovered" the New World. The drylands forest was always there, and the people who live in the area always knew it was there. In fact, they were the only ones who had the background knowledge to identify subtleties like whether an image of a plant in their region was a shrub or actually a young tree, or if what appeared to be a tree was just a perennial plant. A few common perennial crops, including coffee and banana, looked like shrubs in the satellite images, but local participants had no problem identifying them correctly as perennial crops instead of shrubs, a distinction that would have been impossible with satellite imagery analysis alone.
Collect Earth Map-a-thon Event in Gatsibo, Rwanda.
This human identification component, along with the ability to zoom into sub-meter resolution with cheap and available technology, has helped achieve the breakthrough result of forest cover identification 9 percent higher than previously reported.
Local Ownership of the Map and the Land
Utilizing local landscape knowledge not only improved the map quality but also created a sense of ownership within each region. The map-a-thon participants have access to the open source tools and can now use these data and results to better engage around land use changes in their communities. Local experts, including forestry offices, can also use this easily accessible application to continue monitoring in the future.
Global Forest Watch uses medium resolution satellites (30 meters or about 89 feet) and sophisticated algorithms to detect near-real time deforestation in densely forested area. The dryland tree cover maps complement Global Forest Watch by providing the capability to monitor non-dominant tree cover and small-scale, slower-moving events like degradation and restoration. Mapping forest change at this level of detail is critical both for guiding land decisions and enabling government and business actors to demonstrate their pledges are being fulfilled, even over short periods of time.
The data documented by local participants will enable scientists to do many more analyses on both natural and man-made land changes including settlements, erosion features and roads. Mapping the tree cover in drylands is just the beginning.
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Democrats in the House and Senate have introduced legislation to ban some of the most toxic pesticides currently in use in the U.S. D-Keine / E+ / Getty Images
By Jake Johnson
Democrats in the House and Senate on Tuesday introduced sweeping legislation that would ban some of the most toxic pesticides currently in use in the U.S. and institute stronger protections for farmworkers and communities that have been exposed to damaging chemicals by the agriculture industry.
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BP, the energy giant that grew from oil and gas production, is taking its business in a new direction, announcing Tuesday that it will slash its oil and gas production by 40 percent and increase its annual investment in low-carbon technology to $5 billion, a ten-fold increase over its current level, according to CNN.
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By Alex Thornton
The Australian government has announced a A$190 million (US$130 million) investment in the nation's first Recycling Modernization Fund, with the aim of transforming the country's waste and recycling industry. The hope is that as many as 10,000 jobs can be created in what is being called a "once in a generation" opportunity to remodel the way Australia deals with its waste.
Waste Mountain<p>The need for a dramatic increase in Australia's recycling capacity pre-dates the COVID-19 pandemic. <a href="https://www.abc.net.au/news/2019-12-27/where-does-all-australias-waste-go/11755424" target="_blank">Australians create approximately 67 million tons of waste a year</a>, and like in many wealthy countries, much of that was sent overseas. That all changed when China announced it was <a href="https://www.weforum.org/agenda/2017/10/china-has-banned-foreign-waste-so-whats-the-future-of-world-recycling" target="_blank">banning the import of a huge range of foreign waste</a> and recyclables. Soon <a href="https://www.weforum.org/agenda/2019/05/malaysia-flooded-with-plastic-waste-to-send-back-some-scrap-to-source" target="_blank">other countries followed suit</a>, and Australia was forced to look for alternative solutions.</p>
Biggest exporters of plastic. Statista
Waste Export Ban<p>Australia has adopted a strategy of taking responsibility for its own waste. Starting in January 2021, it is phasing in <a href="http://www.environment.gov.au/protection/waste-resource-recovery/waste-export-ban" target="_blank">bans on the export of different forms of waste</a>. By mid 2024, Australia's home-grown recycling industry will have to deal with an extra 650,000 tons of waste plastic, paper, glass and tires.</p><p>"As we cease shipping our waste overseas, the waste and recycling transformation will reshape our domestic waste industry, driving job creation and putting valuable materials back into the economy," federal environment minister Sussan Ley said in a <a href="https://uk.reuters.com/article/us-australia-waste/australia-to-set-up-132-million-fund-to-boost-recycling-following-export-curbs-idUKKBN247060" target="_blank">statement to Reuters</a>.</p>
Timeline for Australia's waste export ban. Australian Government
Trash Into Treasure<p>The benefits to the environment of boosting recycling rates are well known – less landfill, less plastic in our ocean, reduced need for virgin materials, and lower carbon emissions. The Recycling Modernization Fund initiative aims to divert more than 10 million tons of waste from landfill, part of an <a href="http://www.environment.gov.au/protection/waste-resource-recovery/publications/national-waste-policy-action-plan" target="_blank">overall strategy to reduce the total waste generated per person by 10%</a>, and push <a href="https://www.environment.gov.au/system/files/resources/7381c1de-31d0-429b-912c-91a6dbc83af7/files/national-waste-report-2018.pdf" target="_blank">Australia's total resource recovery rate from 58% in 2017</a> to 80% by 2030.</p><p>But like many countries, Australia is focusing on the economic benefits of better waste management as well.</p><p>"This will mean Australia converts more waste into higher valued resources ready for reuse locally by manufacturers and brands in their packaging and products," Rose Read, CEO of the National Waste and Recycling Industry Council, <a href="https://uk.reuters.com/article/us-australia-waste/australia-to-set-up-132-million-fund-to-boost-recycling-following-export-curbs-idUKKBN247060" target="_blank">told Reuters</a>.</p>
Green Jobs<p>The great potential of the circular economy to create green jobs is being recognized across the world.</p><p>In the UK, the Waste and Resources Action Program has launched a <a href="https://wrap.org.uk/buildbackbetter" target="_blank">six-point plan which it claims could add $90 billion to the economy, and create 500,000 new jobs</a>. Investment in the circular economy forms a significant part of the <a href="https://www.nytimes.com/2020/07/14/us/politics/biden-climate-plan.html" target="_blank">$2 trillion climate plan that Democratic candidate Joe Biden</a> is taking into November's US presidential election. And the <a href="https://ec.europa.eu/commission/presscorner/detail/en/ip_20_940" target="_blank">European Union has put its Green New Deal at the heart of its plans for recovery</a> from the economic shock of COVID-19.</p><p>The World Economic Forum's <a href="http://www3.weforum.org/docs/WEF_The_Future_Of_Nature_And_Business_2020.pdf" target="_blank">Future of Nature and Business</a> report identifies 15 systemic transitions with annual business opportunities worth $10 billion a year that could create 395 million jobs by 2030.</p><p>As is the case with Australia's Recycling Modernization Fund, a combination of private enterprise and government investment can offer ways to get people back to work by building a more environmentally sustainable economy.</p>
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The Great American Outdoors Act is now the law of the land.
<div id="e0008" class="rm-shortcode" data-rm-shortcode-id="ffc07febbf5d2d585ad06d3f43e2be56"><blockquote class="twitter-tweet twitter-custom-tweet" data-twitter-tweet-id="1290667833999929344" data-partner="rebelmouse"><div style="margin:1em 0">🚨Breaking News: The President has just signed the bipartisan #GreatAmericanOutdoorsAct. It will help: 🏗️ Restore… https://t.co/RPefKPMn7S</div> — Fix Our Parks (@Fix Our Parks)<a href="https://twitter.com/FixOurParksUS/statuses/1290667833999929344">1596554165.0</a></blockquote></div>
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By Andrew J. Whelton and Caitlin R. Proctor
In recent years wildfires have entered urban areas, causing breathtaking destruction.
Survivors left everything to flee the Camp Fire's path. Andrew Whelton / Purdue University
Wildfires and Water<p>Both the Tubbs and Camp fires destroyed fire hydrants, water pipes and meter boxes. Water leaks and ruptured hydrants were common. The Camp Fire inferno spread at a speed of one football field per second, chasing everyone – including water system operators – out of town.</p><p>After the fires passed, testing ultimately revealed widespread hazardous drinking water contamination. Evidence suggests that the toxic chemicals originated from a combination of <a href="https://doi.org/10.1002/aws2.1183" target="_blank">burning vegetation, structures and plastic materials</a>.</p>
Pipes, water meters and meter covers after wildfires destroyed them. Caitlin Proctor, Amisha Shah, David Yu, and Andrew Whelton/Purdue University
Dangerous Contamination Levels<p>Benzene was found at concentrations of 40,000 parts per billion (ppb) in drinking water after the Tubbs Fire and at more than 2,217 ppb after the Camp Fire. According to the California Office of Environmental Health Hazard Assessment, children exposed to benzene for a single day can suffer <a href="https://engineering.purdue.edu/PlumbingSafety/resources/Benzene-Levels-in-Water.pdf" target="_blank">harm at levels as low as 26 ppb</a>.</p><p>The U.S. Environmental Protection Agency recommends limiting children's short-term acute exposure to <a href="https://www.epa.gov/sites/production/files/2018-03/documents/dwtable2018.pdf" target="_blank">200 ppb</a>, and long-term exposure to less than <a href="https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations" target="_blank">5 ppb</a>. The EPA regulatory level for what constitutes a hazardous waste is <a href="https://19january2017snapshot.epa.gov/sites/production/files/2015-06/documents/tclp.pdf" target="_blank">500 ppb</a>.</p><p>In early 2019, California conducted contaminated water testing on humans by taking contaminated water from the Paradise Irrigation District and asking persons to smell it. The state found that even when people smelled contaminated water that had less than 200 ppb benzene, <a href="https://engineering.purdue.edu/PlumbingSafety/resources/Dissipatiion-of-Burn-Related-VOC-From-Water.pdf" target="_blank">at least one person reported nausea and throat irritation</a>. The test also showed that water contained a variety of other benzene-like compounds that first responders had not sampled for.</p><p>The officials who carried out this small-scale test did not appear to realize the significance of what they had done, until we asked whether they had had their action approved in advance by an institutional review board. In response, they asserted that such a review was not needed.</p><p>In our view, this episode is telling for two reasons. First, one subject reported an adverse health effect after being exposed to water that contained benzene at a level below the EPA's recommended one-day limit for children. Second, doing this kind of test without proper oversight suggests that officials greatly underestimated the potential for serious contamination of local water supplies and public harm. After the Camp Fire, together with the EPA, we estimated that some plastic pipes needed <a href="https://engineering.purdue.edu/PlumbingSafety/opinions/Final-HDPE-Service-Line-Decontamination-2019-03-18.pdf" target="_blank">more than 280 days</a> of flushing to make them safe again.</p>
Plastic pipes can be damaged by heat and fire contact. Andrew Whelton / Purdue University
Building Codes Could Make Areas Disaster-Ready<p>Our research underscores that community building codes are inadequate to prevent wildfire-caused pollution of drinking water and homes.</p><p>Installing one-way valves, called backflow prevention devices, at each water meter can prevent contamination rushing out of the damaged building from flowing into the larger buried pipe network.</p><p>Adopting codes that required builders to install fire-resistant meter boxes and place them farther from vegetation would help prevent infrastructure from burning so readily in wildfires. Concrete meter boxes and water meters with minimal plastic components would be less likely to ignite. Some plastics may be practically impossible to make safe again, since all types are susceptible to fire and heat.</p><p>Water main shutoff valves and water sampling taps should exist at every water meter box. Sample taps can help responders quickly determine water safety.</p>
<span style="display:block;position:relative;padding-top:56.25%;" class="rm-shortcode" data-rm-shortcode-id="9540d7e271306ed417112042a3efc9a4"><iframe lazy-loadable="true" src="https://www.youtube.com/embed/GnlrzI1wdAI?rel=0" width="100%" height="auto" frameborder="0" scrolling="no" style="position:absolute;top:0;left:0;width:100%;height:100%;"></iframe></span>
The Smell Test Doesn’t Work<p>Under no circumstance should people be told to <a href="https://www.waterboards.ca.gov/press_room/press_releases/2018/pr122418_voc.pdf" target="_blank">smell the water</a> to determine its safety, as was recommended for months after the Camp Fire. Many chemicals have no odor when they are harmful. Only testing can determine safety.</p><p>Ordering people to boil their water will not make it safe if it contains toxic chemicals that enter the air. Boiling just transmits those substances into the air faster. "Do not use" orders can keep people safe until agencies can test the water. Before such advisories are lifted or modified, regulators should be required to carry out a full chemical screen of the water systems. Yet, <a href="https://doi.org/10.1002/aws2.1183" target="_blank">disaster</a> after <a href="https://pubs.rsc.org/en/content/articlehtml/2017/ew/c5ew00294j" target="_blank">disaster</a>, government agencies have failed to take this step.</p><p>Buildings should be tested to find contamination. <a href="https://www.purdue.edu/newsroom/releases/2020/Q1/study-your-homes-water-quality-could-vary-by-the-room-and-the-season.html" target="_blank">Home drinking water quality can differ from room to room</a>, so reliable testing should sample both cold and hot water at many locations within each building.</p><p>While infrastructure is being repaired, survivors need a safe water supply. Water treatment devices sold for home use, such as refrigerator and faucet water filters, are not approved for extremely contaminated water, although product sales representatives and government officials may <a href="https://undark.org/2019/09/19/camp-fire-california-drinking-water-carcinogens/" target="_blank">mistakenly think</a> the devices can be used for that purpose.</p><p>To avoid this kind of confusion, external technical experts should be called in assist local public health departments, which can quickly become overwhelmed after disasters.</p>
<div id="71cf9" class="rm-shortcode" data-rm-shortcode-id="e059d199e8368d282a31601e372e4dda"><blockquote class="twitter-tweet twitter-custom-tweet" data-twitter-tweet-id="1204068265980547075" data-partner="rebelmouse"><div style="margin:1em 0">The Los Angeles City Council's Planning and Land Use Committee signed off on an effort to expand the city's fire-re… https://t.co/fP8Z8mUq7R</div> — IntlCodeCouncil (@IntlCodeCouncil)<a href="https://twitter.com/IntlCodeCouncil/statuses/1204068265980547075">1575907219.0</a></blockquote></div>
Preparing for Future Fires<p>The damage that the Tubbs and Camp fires caused to local water systems was preventable. We believe that urban and rural communities, as well as state legislatures, should establish codes and lists of authorized construction materials for high-risk areas. They also should establish rapid methods to assess health, prepare for water testing and decontamination, and set aside emergency water supplies.</p><p>Wildfires are coming to urban areas. Protecting drinking water systems, buried underground or in buildings, is one thing communities can do to prepare for that reality.</p>
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By Zulfikar Abbany
"We don't have a definition of life," says Kevin Peter Hand, one early California morning when we speak via video. "We don't actually know what life is."