File:Ahaggar Landsat 8 surface reflectance composite.jpg
Original file (3,929 × 3,929 pixels, file size: 4.75 MB, MIME type: image/jpeg)
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Summary[edit]
| Description |
Deutsch: Das Ahaggar, auch bekannt als Hoggar, ein vulkanisches Gebirge in der zentralen Sahara.
Das Bild ist gemittelt aus 34 Landsat 8-Aufnahmen, bereitgestellt von der NASA. Grundlage sind die surface reflectance-Daten vom USGS. Verwendet wurden die Kanäle 4, 3 und 2 um ein RGB-Bild zu erzeugen. Die Aufnahmen wurden in R mit dem Paket RStoolbox koregistriert, gewichtet gemittelt, und auf die Extrema skaliert. JPEG-enkodiert mit Guetzli. Aufnahmen aus dem Zeitraum 16 June 2013 – 7 December 2018, jeweils im Mittel um 10:04, Bereich 10:03–10:06. Der Sonnenstand rangiert im Bereich Azimuth 85°–155°, im Mittel 124°; Höhe 39°–69°, im Mittel 56°. Auflösung: 30m. Projektion: UTM 31 N, WGS84. Bildmitte: 769590, 2574870; südwestliche Ecke: 710655, 2515935; südöstliche Ecke: 828525, 2515935; nordwestliche Ecke: 710655, 2633805; nordöstliche Ecke: 828525, 2633805. Aus WRS-2 Path 192 Row 044.English: The Ahaggar, also known as the Hoggar, a volcanic mountain range in the central Sahara.
The image is averaged from 34 Landsat 8-scenes, provided by NASA. Input data are surface reflectance values calculated by USGS. Bands 4, 3 and 2 were combined into an RGB image. Co-registration, weighted averaging, and rescaling to extrema of the scenes was done in R with the package RStoolbox. JPEG-encoded with Guetzli. Images acquired in the range 16 June 2013 – 7 December 2018, each at mean 10:04, range 10:03–10:06. The sun position range: azimuth 85°–155°, average 124°; elevation 39°–69°, average 56°. resolution: 30m. projection UTM 31 N, WGS84. Center: 769590, 2574870; south-west corner: 710655, 2515935; south-east corner: 828525, 2515935; north-west corner: 710655, 2633805; north-east corner: 828525, 2633805. From WRS-2 Path 192 Row 044. |
| Date | |
| Source | NASA, USGS, Own work |
| Author | Linus Wolf |
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| Object location |  | View this and other nearby images on: OpenStreetMap |  |
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This file is made available under the Creative Commons CC0 1.0 Universal Public Domain Dedication. |
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| Annotations | This image is annotated: View the annotations at Commons |
File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 03:23, 5 October 2019 | | 3,929 × 3,929 (4.75 MB) | Linus Wolf (talk | contribs) | + 2 input rasters |
| 23:42, 15 March 2019 |  | 3,929 × 3,929 (4.77 MB) | Linus Wolf (talk | contribs) | Discarded image manipulation. | |
| 14:24, 15 March 2019 |  | 3,926 × 3,926 (5.45 MB) | Linus Wolf (talk | contribs) | User created page with UploadWizard |
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