We need the netCDF to open in Panoply the file as a geo2D. If it opens merely as 2D, we cannot make the stereographic or equal area projection maps. So I guess that means lat,lon rather than x,y. These two do not open a geo2D in Panoply, just a 2D:
ftp://ftp.awi.de/sea_ice/product/amsr2/v100/nh/2020/08/nh_20200818_21_SIC_12h.nc.gzftp://ftp.awi.de/sea_ice/product/amsr2/v100/nh/2020/08/nh_20200818_21_SIC_72h.nc.gzDr Schmunk of NASA GISS, the sole creator of Panoply, told me Panoply will not ever support the conversion of x,y to geo-registered. Since Panoply does implement netCDFdump in its export, this could presumably be done elsewhere in command line.
Earlier, i was able to use an online converter (a GDAL command in web browser) to change a 'latest' tiff file to a netCDF geo2D. This is better done at your end!
Note reducing land/water edge pixels will really improve the products we make here. Also the two new filters that reduce erroneous weather pixels will make improvements. Our 'darken only' filter is similar but not likely as good as the 'latitude-dependent minimum' and 'time-domain median' filters.
There is no citation describing these filters.
Can that be added to the ReadMe? .
Any chance you could post an example of before-and-after affects of these two filters?
I could not confirm 3125 m grid cell size. Or rather,
the tiff image is 5000 m pixels, derived from direct comparison to UHH LARGE which I'm assuming is 3125m.
I am just testing the downloads now from the current directory ...
ftp://ftp.awi.de/sea_ice/product/amsr2/v100/nh/2020/08/Here are the highlights (a few typos fixed) from the upper ReadMe file which people might not see:
AWI AMSR2 ice concentration product v100 25.8.2020
Contact: lars.kaleschke aatt awi.de
The AWI AMSR2 ice concentration product is based on previous developments at the University of Bremen (UB) and the University of Hamburg (UHH) [1,2,3]. The level 1 brightness temperature data are provided by the Japan Aerospace Exploration Agency’s (JAXA) Advanced Microwave Scanning Radiometer 2 (AMSR2) [4]. The AWI AMSR2 product is under continuos development and feedback is appreciated.
Reprocessing of the full AMSR2 time series is planned as soon as the data product and format is finally settled. The earliest at UHH is 01 Aug 2012 to 30 Sept 2020. The new AWI archive currently has Aug 18 through Aug 24.
A) FAST product
The product is generated twice daily for two different median times (filenames with _09_ or _21_)
09:00 +- 9h
21:00 +- 9h
After 18 hours the spatial coverage is almost complete. The twice daily (file name includes _12h) product has data gaps and errors due to weather effects and along the coastline.
B) CLEAN product
This product takes into account the latest 72 hours of data (file name includes _72h). The coastline is extended by about one grid cell and masks the frequently occurring erroneous coastal overestimation.
Time-domain median- and latitude-dependent minimum-filtering reduces erroneous weather pixels.
The land mask is derived from
https://osmdata.openstreetmap.de/data/An obvious difference to previous (UB and UHH) products is a correct representation of northeast Greenland, e.g. the Danmark Fjord, which was wrong in the previous land mask derived from The Global Self-consistent, Hierarchical, High-resolution Geography Database (GSHHG).
A very high resolution map 058 x 3641 of the fjord and NE Greenland 3can be found at wikipedia:
https://upload.wikimedia.org/wikipedia/commons/2/29/North_Greenland_section-txu-pclmaps-oclc-8322829_a_1.jpgNetCDF and GeoTIFF formats provided
Projection and grid
-------------------
https://epsg.io/3411 NSIDC Sea Ice Polar Stereographic North
https://epsg.io/3412 NSIDC Sea Ice Polar Stereographic South
Grid cell size 3125 meter
Data distribution: free without warranty
ftp://ftp.awi.de/sea_ice/product/amsr2/References:
[1] L. Kaleschke, C. Lüpkes, T. Vihma, J. Haarpaintner, A. Bochert, J. Hartmann & G. Heygster (2001) SSM/I Sea Ice Remote Sensing for Mesoscale Ocean-Atmosphere Interaction Analysis, Canadian Journal of Remote Sensing, 27:5, 526-537, DOI:10.1080/07038992.2001.10854892
[2] Spreen, G., L. Kaleschke, and G. Heygster (2008), Sea ice remote sensing using AMSR-E 89-GHz channels, J. Geophys. Res., 113, C02S03, doi:10.1029/2005JC003384.
[3] Beitsch, A.; Kaleschke, L.; Kern, S. Investigating High-Resolution AMSR2 Sea Ice Concentrations during the February 2013 Fracture Event in the Beaufort Sea. Remote Sens. 2014, 6, 3841-3856.
https://doi.org/10.3390/rs6053841[4]
https://gportal.jaxa.jp/gpr//*/*/*/*/*/*/*/*
Wiki history: In May 1907 Mylius-Erichsen entered the unknown Danmark Fjord with his three-dogsled exploration team deeming it would be leading him to the Navy Cliff and the Peary Channel. The team, which included cartographer Niels Peter Høeg Hagen and dogsled expert Jørgen Brønlund, traveled southwestwards until the head of the fjord and, becoming aware that it was a dead end, they backtracked to the northeast.
By the end of May Mylius-Erichsen's team was back again at the mouth of the fjord. As they met Johan Peter Koch's northern team at Cape Rigsdagen, already on their way back from Cape Bridgman, Mylius-Erichsen realized that they had wasted precious time and provisions by entering the long unexplored fjord. The delay would eventually lead the three men to their death as they pressed westward along the southern shore of Independence Fjord instead of returning to the ship.