The detailed images of the cities were taken by astronauts aboard the International Space Station.
While the original image consisted of 87.970 images, the map from 2012 comprises 349.525 images, therefore adding a grand total of 437.495 images for this map. Geocoding is provided by Google and Nominatim via ol3-geocoder.Īs the maps provided by NASA were in a different projection as the one required by Google Maps, the GDAL - Geospatial Data Abstraction Library library was used for the conversion. This uses imagery from OpenStreetMap, Thunderforest, Bing Maps, and Mapquest. The 3D map was created using Cesium via OpenLayers and ol-cesium. The Google Maps API was used for creating the original visualisation. The daylight images provided by Google Maps (maps and satellite views) are also available for reference. The original image from 2000 was created by NASA using data from the Defense Meteorological Satellite Program (DMSP)'s Operational Linescan System (OLS), originally designed to view clouds by moonlight.This satellite uses the “day-night band” of the Visible Infrared Imaging Radiometer Suite (VIIRS), which detects light in a range of wavelengths from green to near-infrared and uses filtering techniques to observe dim signals such as gas flares, auroras, wildfires, city lights, and reflected moonlight. It took over nine days in April 2012 and thirteen days in October 2012, during 312 orbits at 824 kilometers (512 miles) to capture the whole Earth. The main image of the Earth at night (2012) was captured by NASA using the Suomi National Polar-orbiting Partnership (Suomi NPP) satellite.
Two versions of the images are available: Deserts in Africa, Arabia, Australia, Mongolia, and the United States are poorly lit as well (except along the coast and rivers), along with the boreal forests of Canada and Russia, and the great mountains of the Himalaya. The interior jungles of Africa and South America are mostly dark. Some regions remain thinly populated and unlit. The Nile River, from the Aswan Dam to the Mediterranean Sea, is another bright thread through an otherwise dark region. In Russia, the Trans-Siberian railroad is a thin line stretching from Moscow through the center of Asia to Vladivostok. The United States interstate highway system appears as a lattice connecting the brighter dots of city centers. Cities tend to grow along coastlines and transportation networks.
The brightest areas of the Earth are the most urbanized, but not necessarily the most populated (compare western Europe with China and India).
DAYMAP FOR PC MAC
The program works well within the Mac ecosystem, and makes good use of iCloud to sync between the OS X and iOS versions.The Night Earth map shows the lights that are visible at night on the Earth's surface. Bottom LineĭayMap built its reputation on providing visual task scheduling and organization. ConsĮxporting data: Although you can print a file of your week, there doesn't appear to be any easily accessible means to export calendar data in a form that could be shared with other programs. It's an incredibly effective way of organizing your schedule. The split-screen view that lets you see your entire calendar and the week's tasks makes it easy to get a more complete picture of what you have to do in a single glance. Interface: The entire concept of this program is built around its interface. IOS syncing: DayMap also has an iOS client, and you can use iCloud to sync the data between your mobile and desktop versions of the application.
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