File:Ahaggar_Landsat_8_pan_sharpened_composite.jpg
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Summary
DescriptionAhaggar Landsat 8 pan sharpened composite.jpg |
English: The Ahaggar, also known as the Hoggar, a volcanic mountain range in the central Sahara.
The image is averaged from 58 Landsat 8-scenes, provided by NASA. Bands 4, 3, 2 and 8 were combined into an RGB image. Panchromatic sharpening, conversion to radiance, 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 18 July 2013 – 2 March 2021, each at mean 10:05, range 10:04–10:07. The sun position range: azimuth 86°–155°, average 133°; elevation 38°–69°, average 52°. Resolution: 15m. Projection: UTM 31 N, WGS84. Center: 769590, 2574870. From WRS-2 Path 192 Row 044.Deutsch: Das Ahaggar, auch bekannt als Hoggar, ein vulkanisches Gebirge in der zentralen Sahara.
Das Bild ist gemittelt aus 58 Landsat 8-Aufnahmen, bereitgestellt von der NASA. Verwendet wurden die Kanäle 4, 3, 2 und 8 um ein RGB-Bild zu erzeugen. Die Aufnahmen wurden in R mit dem Paket RStoolbox panchromatisch geschärft, gewichtet gemittelt, und auf die Extrema skaliert. JPEG-enkodiert mit Guetzli. Aufnahmen aus dem Zeitraum 18 July 2013 – 2 March 2021, jeweils im Mittel um 10:05, Bereich 10:04–10:07. Der Sonnenstand rangiert im Bereich Azimuth 86°–155°, im Mittel 133°; Höhe 38°–69°, im Mittel 52°. Auflösung: 15m. Projektion: UTM 31 N, WGS84. Bildmitte: 769590, 2574870. Aus WRS-2 Path 192 Row 044. |
Date | |
Source | NASA, Own work |
Author | Linus Wolf |
Other versions |
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Object location | 23° 15′ 39.85″ N, 5° 38′ 06.26″ E | View this and other nearby images on: OpenStreetMap | 23.261069; 5.635073 |
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Items portrayed in this file
depicts
18 March 2019
23°15'39.848"N, 5°38'6.263"E
image/jpeg
c169c0a63b87e8d5a38e1963e34b6079db09d842
25,676,791 byte
8,751 pixel
8,751 pixel
File history
Click on a date/time to view the file as it appeared at that time.
Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 17:40, 19 March 2021 | 8,751 × 8,751 (24.49 MB) | Linus Wolf | increase number of input rasters to 58 | |
04:03, 21 December 2020 | 8,751 × 8,751 (24.49 MB) | Linus Wolf | increased number of input rasters to 54 | ||
12:18, 4 August 2020 | 8,751 × 8,751 (24.37 MB) | Linus Wolf | increased number of input images to 49 while excluding a few; fixed a problem causing artefacts | ||
22:39, 13 July 2020 | 8,721 × 8,721 (24.04 MB) | Linus Wolf | + 1 input raster; undid histogram matching (while fixing an error in weighted averaging), switched back to intensity-hue-saturation method for panchromatic sharpening, and changed scaling so that channels are not scaled separately | ||
16:35, 13 April 2020 | 8,693 × 8,693 (25.35 MB) | Linus Wolf | discarded one more input raster with clouds, added several which seem good in the extent used for this image. Switched to Brovey reweighting for panchromatic sharpening. Added histogram matching between input rasters (the change in color is noticeable, I think). Fixed an issue of missing values not being excluded in averaging. | ||
18:25, 24 December 2019 | 8,675 × 8,675 (23.67 MB) | Linus Wolf | added one new input raster; removed one which had clouds; set gamma correction to power 1.3 | ||
00:47, 5 October 2019 | 8,654 × 8,654 (23.47 MB) | Linus Wolf | + 1 input raster | ||
01:34, 12 May 2019 | 8,610 × 8,610 (23.09 MB) | Linus Wolf | + 1 input raster; slight gamma correction | ||
01:16, 14 April 2019 | 8,482 × 8,482 (22.35 MB) | Linus Wolf | {{Information |description ={{en|1=The Ahaggar, also known as the Hoggar, a volcanic mountain range in the central Sahara. The image is averaged from 32 Landsat 8-scenes, provided by NASA. Bands 4, 3, 2 and 8 were combined into an RGB image. Co-registration, weighted averaging, and rescaling to extrema of the scenes was done in R with the package [https://bleutner.github.io/RStoolbox/ RStoolbox]. JPEG-encoded with [https://github.... |
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