If aliens were monitoring our planet over many years, and they really liked the color blue, here is a runup of places they might choose to visit.
Derived over continental-scale regions of North America, South America, Europe, West Asia, East Asia, and Australia for top of atmosphere (TOA), so as observed from space, by Landsat 8 over five years of imagery. Future work aims to examine how much the ‘bluest square km’ moves around for different time intervals. Analysis excludes very high northern latitudes and Antarctica as areas of long duration or perpetual snow/ice cover returned inconsistent results. Resolution = 1 km². Median filtered imagery to remove clouds, cloud shadows, and anomalous reflectances.
Keywords: Geography Viz, World Geography, Bluest Square Kilometer, By Continent, Landsat 8 Imagery, Blue index, Top of Atmosphere, Median Filter, Lake Spectral Analysis, NASA EO-1 Hyperion, Africa, Lake Malawi, East Asia, Mongolia, Lake Khövsgöl, Europe, Russia, Lake Ladoga, Australia, New Zealand, Lake Wakatipu, South America, Chile, Lago Azul, North America, USA, California, Lake Tahoe, West Asia, China, Tibet, Lake Mucuo
Resources:
-Landsat 8, Google Earth Engine, ArcGIS Pro, PPT, gInk, OBS Studio, OpenShot
-Color info from convertingcolors.com, incl. Behr paint ‘color names’ (over 4600 colors)
-Didn’t include for this vid; All were ‘Beluga’; Lowest variance (cf. reddest km²)
-Maps and near community identification from various ESRI basemaps
-Populations are most recently available from Wikipedia
-Hyperspectral data from NASA EO-1 Hyperion
Blueness is calculated as the amount of blue reflected light relative to red and green reflected light: Blue index = Blue / ((Red + Green) / 2)
0:00 Intro
0:10 Lake Malawi, Africa
0:25 Lake Khövsgöl, Mongolia, East Asia
0:40 Lake Ladoga, Russia, Europe
0:51 Lake Wakatipu, New Zealand, Australia
1:04 Lago Azul, Chile, South America
1:28 Lake Tahoe, California, USA, North America
1:54 Lake Mucuo, China, Tibet, West Asia
2:30 Lake Spectral Analyses, NASA EO-1 Hyperion
3:20 Map and Conclusion
Details by region:
Africa
Lake Malawi
11.910°S, 34.841°E, 476 m
Near Mzuzu (105 km), Mzimba (139 km)
Hex #0A0F1A
Bindex=2.13
East Asia
Lake Khövsgöl, Mongolia
100.364°N, 50.848°E, 1645 m
Near Khovsgol (120 km), Erdenebulgan (190 km)
Hex #0A1221
Bindex=2.26
Europe
Lake Ladoga, Russia
60.994°N, 30.745°E, 1 m
Near Priozersk (70 km), St. Petersburg (230 km)
Hex #080D1A
Bindex=2.39
Australia
Lake Wakatipu, New Zealand
45.057°S, 168.690°E, 312 m
Near Kelvin Heights (2 km), Queenstown (5 km)
Hex #080F1C
Bindex=2.40
South America
Lago Azul, Chile
41.943°S, 71.852°W, 226 m
Near Lago Pueblo (32 km), El Bolsón (35 km)
Hex #080D1A
Bindex=2.48
North America
Lake Tahoe, California, USA
39.159°N, 120.037°W, 1898 m
Near Dollar Point (8 km), Crystal Bay (10 km)
Hex #050A14
Bindex=2.57
West Asia
Lake Mucuo, China
30.674°N, 86.252°E, 4686 m
Near Xigazê (355 km), Lhasa (560 km)
Hex#050A17
Bindex=2.84
Photo credit ‘Xuru Co’ by yy hu, Oct 2018, www.google.com/maps/place/Xuru+Co/@30.2711512,86.3984793
Негізгі бет Most BLUE square km on Earth (by major region)
Пікірлер: 10