Bestand:Ahaggar Landsat 8 pan sharpened composite.jpg
Grootte van deze voorvertoning: 600 × 600 pixels. Andere resoluties: 240 × 240 pixels | 480 × 480 pixels | 768 × 768 pixels | 1.024 × 1.024 pixels | 2.048 × 2.048 pixels | 8.751 × 8.751 pixels.
Oorspronkelijk bestand (8.751 × 8.751 pixels, bestandsgrootte: 24,49 MB, MIME-type: image/jpeg)
Bestandsgeschiedenis
Klik op een datum/tijd om het bestand te zien zoals het destijds was.
Datum/tijd | Miniatuur | Afmetingen | Gebruiker | Opmerking | |
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huidige versie | 19 mrt 2021 19:40 | 8.751 × 8.751 (24,49 MB) | Linus Wolf | increase number of input rasters to 58 | |
21 dec 2020 06:03 | 8.751 × 8.751 (24,49 MB) | Linus Wolf | increased number of input rasters to 54 | ||
4 aug 2020 14:18 | 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 | ||
14 jul 2020 00:39 | 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 | ||
13 apr 2020 18:35 | 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. | ||
24 dec 2019 20:25 | 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 | ||
5 okt 2019 02:47 | 8.654 × 8.654 (23,47 MB) | Linus Wolf | + 1 input raster | ||
12 mei 2019 03:34 | 8.610 × 8.610 (23,09 MB) | Linus Wolf | + 1 input raster; slight gamma correction | ||
14 apr 2019 03:16 | 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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