The impressive and/or insane thing about the New York City Tree Map is that it maps individual trees: now about 860,000 of them, all managed by the city’s parks department on city streets and in parks, down to the species and trunk diameter, which also means you can filter for those parameters, plus get most recent inspection and tree care data on specific trees. You can even favourite individual trees. If trees had social media accounts, they’d be here. [Bloomberg CityLab]
According to a research team led by Nico Lang of the EcoVision Lab at ETH Zürich, only 5 percent of the Earth’s land area in 2020 was covered with trees standing taller than 30 meters.
Lang, together with colleagues Konrad Schindler and Jan Wegner, produced the map by merging lidar data from NASA’s Global Ecosystem Dynamics Investigation (GEDI) mission with optical imagery from the European Space Agency’s Sentinel-2 satellites. GEDI’s lidar profiles give detailed canopy heights, but the profiles cover limited areas; Sentinel-2 optical data has abundant coverage, but it is not designed to measure canopy height. The researchers used the GEDI data to train a deep-learning model capable of estimating canopy heights from Sentinel-2 images anywhere on Earth.
Funded by NASA’s Carbon Monitoring System, scientists recently built a new series of maps detailing the geography of methane emissions from fossil fuel production. Using publicly available data reported in 2016, the research team plotted fuel exploitation emissions—or “fugitive emissions” as the UNFCCC calls them—that arise before the fuels are ever consumed. The maps delineate where these emissions occur based on the locations of coal mines, oil and gas wells, pipelines, refineries, and fuel storage and transportation infrastructure. The maps were recently published at NASA’s Goddard Earth Sciences Data and Information Services Center (GES DISC). (Note that 2016 was the most recent year with complete UN emissions data available at the time of this study.)
Earlier this year, the New Yorker published a profile of Molly Burhans. Burhans is the founder of GoodLands, a Catholic organization focusing on mobilizing the land and resources of the Church to address climate change and other environmental issues. Burhans, whose background is in GIS, began by wanting to analyse the Church’s property holdings; she soon found out that the Church’s own record-keeping was somewhere between out of date and nonexistent—and certainly not digital.
In the Office of the Secretariat of State that day, Burhans met with two priests. She showed them the prototype map that she had been working on, and explained what she was looking for. “I asked them where their maps were kept,” she said. The priests pointed to the frescoes on the walls. “Then I asked if I could speak to someone in their cartography department.” The priests said they didn’t have one.
Burhans, who became known as the Map Lady at the Vatican, was asked if she’d be willing to create a cartography institute at the Vatican; plans to develop one have been waylaid by the COVID-19 pandemic (Burhans came down with a significant case herself.) Fascinating piece depicting the gap between modern data and an ancient institution, and the notion of using data as a force for progress. Thanks to John Greenhough for sending me a copy of this article; apologies for taking months to post about it.
NASA Earth Observatory: “Researchers at the University of Michigan (UM) recently developed a new method to map the concentration of ocean microplastics around the world. The researchers used data from eight microsatellites that are part of the Cyclone Global Navigation Satellite System (CYGNSS) mission. Radio signals from GPS satellites reflect off the ocean surface, and CYGNSS satellites detect those reflections. Scientists then analyze the signals to measure the roughness of the ocean surface. These measurements provide scientists with a means to derive ocean wind speeds, which is useful for studying phenomena like hurricanes. It turns out that the signals also reveal the presence of plastic.”
A new study published in Nature Sustainability maps the Earth’s reserves of what is called “irrecoverable carbon”—that is to say, those stores of carbon in nature that, if released into the atmosphere, would not be able to be restored in the timeframe required to deal with climate change. These stores include wetlands and old-growth forests, which take longer to replenish.
Irrecoverable carbon represents 20% of the total manageable ecosystem carbon. Globally, 79.0 Gt (57%) of irrecoverable carbon is found in biomass while 60.0 Gt (43%) is in soils. […] The largest and highest-density irrecoverable carbon reserves are in the tropical forests and peatlands of the Amazon (31.5 Gt), the Congo Basin (8.2 Gt) and Insular Southeast Asia (13.1 Gt); the temperate rainforest of northwestern North America (5.0 Gt); the boreal peatlands and associated forests of eastern Canada and western Siberia (12.4 Gt); and mangroves and tidal wetlands globally (4.8 Gt).
The study argues that such reserves should be considered unexploitable; about 48 percent of it is already within protected or indigenous lands. About half the irrecoverable carbon sits on 3.3 percent of the world’s land area. [ScienceNews, GIS Lounge]
A new online map tracks tropospheric global nitrogen dioxide concentrations—which we’ve seen drop sharply this year as the pandemic shut down economic activity. “This online platform uses data from the Copernicus Sentinel-5P satellite and shows the averaged nitrogen dioxide concentrations across the globe—using a 14-day moving average. Concentrations of short-lived pollutants, such as nitrogen dioxide, are indicators of changes in economic slowdowns and are comparable to changes in emissions. Using a 14 day average eliminates some effects which are caused by short term weather changes and cloud cover. The average gives an overview over the whole time period and therefore reflects trends better than shorter time periods.” [ESA]
Concentrations of NO2 in the atmosphere are highly variable in space and time: they typically vary by one order of magnitude within each day and quite substantially from one day to another because of the variations in emissions (for example the impacts of commuter traffic, weekdays and weekend days) as well as changes in the weather conditions. This is why, even if observations are available on a daily (currently available from satellites) or even hourly (ground-based observations) basis, it is necessary to acquire data for a substantial period of time in order to check that a statistically robust departure from normal conditions has emerged.
Cloud cover is a factor that needs to be taken into account as well.
The U.S. National Library of Medicine’s TOXNET, an interactive map that tracked pollution, chemical exposure, toxicology and other data, was shut down last month. The move has been criticized in the context of the Trump administration’s rollback of environmental protections, but the NLM insists that the decision was theirs. The data mapped by TOXNET is available from other sources, but, and this is the point, not as easily or centrally accessible. [The Hill, Newsweek]
NASA Earth Observatory: “The map above depicts changes in water storage on Earth—on the surface, underground, and locked in ice and snow—between 2002 and 2016. Shades of green represent areas where freshwater levels have increased, while browns depict areas where they have been depleted. Data were collected by the GRACE mission, which precisely measured the distance between twin spacecraft as they responded to changes in Earth’s gravity field. In sensing the subtle movements of mass around the planet, the satellites could decipher monthly variations in terrestrial water storage.” The GRACE observations form the basis of a study published this month in Nature on changes in global fresh water availability. More at the JPL’s GRACE-FO project page. [Benjamin Hennig]
NASA: “Satellites measured land and ocean life from space as early as the 1970s. But it wasn’t until the launch of the Sea-viewing Wide Field-of-view Sensor (SeaWiFS) in 1997 that the space agency began what is now a continuous, global view of both land and ocean life. A new animation captures the entirety of this 20-year record, made possible by multiple satellites, compressing a decades-long view of life on Earth into a captivating few minutes.” Here’s a video about it:
Earlier this year, we shared the first results of this effort with pollution levels throughout the city of Oakland.
We’re just beginning to understand what’s possible with this hyper-local information and today, we’re starting to share some of our findings for the three California regions we’ve mapped: the San Francisco Bay Area, Los Angeles, and California’s Central Valley (the Street View cars drove 100,000 miles, over the course of 4,000 hours to collect this data!) Scientists and air quality specialists can use this information to assist local organizations, governments, and regulators in identifying opportunities to achieve greater air quality improvements and solutions.
The Atlas for the End of the World collects a series of world maps that measure our planet’s environmental well-being. More specifically, they examine the amount of protected area in our planet’s biological hotspots, especially relative to the UN Convention on Biological Diversity’s 2020 conservation targets. Created by landscape architects, the accompanying text (by project lead Richard J. Weller) tends toward the abstruse and verbose, but the maps themselves are quite interesting. (I note that they make extensive use of the Goode homolosine projection, which is refreshing.) [Geo Lounge]
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