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Messages - pdjakow

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Arctic sea ice / Re: 2016 sea ice area and extent data
« on: November 18, 2016, 05:34:02 PM »
Last addition, area/extent, normal and anomaly in one graph Cryosphere Today-style.

Are these graphs normalized as title said?

Developers Corner / Re: Problem with IMS snow&ice data
« on: November 18, 2013, 11:37:43 AM »
I used lat/lon data files, as Chris said. This working good, however files are large and must be loaded into memory.

I have still problem with proper pixel drawing.

Developers Corner / Re: Problem with IMS snow&ice data
« on: November 17, 2013, 09:08:23 AM »
I'm working on ASCII files:

Image above was created with reading this ASCII file line by line and values represented by colors:

light blue (0) - outside northern hemisphere
blue (1) - ocean
green (2) - land
gray (3) - ice
white (4) - snow

Oryginal size image is here:


Of course if I replace line:




"Mirror effect" will be removed.

Developers Corner / Problem with IMS snow&ice data
« on: November 16, 2013, 05:57:20 PM »
Hello all!

I have problems with proper interpretation of IMS snow&ice data on NSIDC:

What I want to do is:

- get 4km ASCII file
- convert data file to something like dbf file:

lat lon value

Unfortunetaly data file is in polar stereographic projection:

Northern Hemisphere coverage is available at approximately 4-km and at approximately 24-km resolution. The bounding coordinates are as follows:

Southernmost Latitude: 0° N
Northernmost Latitude: 90° N
Westernmost Longitude: 180° W
Easternmost Longitude: 180° E

Data are in a polar stereographic projection centered at 90° N with the vertical longitude from the Pole at 80° W and the standard parallel at 60° N.

Example data files from NATICE:

There is 6144x6144 data points, and I don't know how to calculate position of each value. I even try to make image from that data, and that was funny in some way ;)

Does anyone know alghoritm to calculate lat/lon position of each data point?

//this image is of course mirror image of real world

GFS model forecast for Arctic (T2M, MSLP, T850, WIND10)

Low level pressure will stay with us at least for 8 days.

Consequences / Re: Weird Weather
« on: May 24, 2013, 10:06:54 AM »
Europe still divided:

GFS forecast.

Arctic sea ice / Re: Piomas vs. CryoSat
« on: May 04, 2013, 01:16:27 PM »
I wonder if there are PIOMAS data in gridded dataset i.e. netCDF files...

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