satellite – Page 3 – The Map Room

Mapping Nitrogen Dioxide Pollution

Published on 28 January 2016 by Jonathan Crowe

A decade’s worth of data from the Ozone Monitoring Instrument aboard the Aura satellite reveals the change in global nitrogen dioxide (NO₂) pollution from 2005 to 2014: down significantly in some areas, due to stricter emissions controls, but up sharply in others. More at NASA Earth Observatory.

Lake Poopó Dries Up

Published on 23 January 201623 January 2016 by Jonathan Crowe

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Lake Poopó has become the Aral Sea of the Andes. Thanks to drought, water diversion and mining activity, the lake—long, wide, shallow, saline and the second-largest in Bolivia—has basically dried up, as this comparison of 2013 and 2016 Landsat 8 images demonstrates. CBC News, The Independent.

New Year’s Flooding in the Midwest

Published on 11 January 201611 January 2016 by Jonathan Crowe

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These two Landsat images illustrate the extent of flooding along the Wabash and Illinois Rivers at the end of last year, as 6-10 inches of rain fell over the midwestern United States. The image from 8 December 2015, above left, shows normal water levels; the image from 1 January 2016, above right, shows the rivers in flood. Use the slider to compare the two views. Original image. [via]

Pacific Ocean Time Lapse

Published on 7 January 2016 by Jonathan Crowe

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Clouds swirl across the Pacific Ocean in this time lapse. The data is from Himawari-8, a Japanese weather satellite in geostationary orbit over New Guinea. Every 10 minutes, it photographs the hemisphere below it. This animation is a loop of yesterday’s images. Strong winds head from East Asia, in the upper left, toward Alaska, hidden by clouds in the upper right. Australia is in the bottom center, with the edge of the Antarctic ice sheet below it and tropic storm Ula to its right. The reflection of the sun on smooth water, called sunglint, moves east to west across the Pacific just south of the Equator. At this time of year – the Southern Hemisphere’s summer – the North Pole is never sunlit, but the South Pole always is.

A post shared by Mapbox (@mapbox) on Jan 6, 2016 at 1:39pm PST

From Mapbox’s Instagram account (via).

Mapping the Thaw

Published on 6 January 20167 January 2016 by Jonathan Crowe

Scientists have been tracking seasonal freeze-thaw patterns for 30 years. This map, produced from data collected by NASA’s Soil Moisture Active Passive satellite, “shows the freeze-thaw status of areas north of 45 degrees latitude on March 5, 2015, as spring approached. Frozen land is blue; thawed land is pink. The measurement is possible because frozen water forms crystalline structures that can be detected by satellites.” NASA Earth Observatory.

Herbal Earth

Published on 19 June 20134 November 2017 by Jonathan Crowe

Today NASA released a set of vegetation maps based on data from the Suomi NPP satellite. Flickr photoset, YouTube video. The maps depict a year’s worth of changes in vegetation. “High values of Normalized Difference Vegetation Index, or NDVI, represent dense green functioning vegetation and low NDVI values represent sparse green vegetation or vegetation under stress from limiting conditions, such as drought.” Image credit: NASA/NOAA.