[ncl-talk] Reading NSIDC sea ice motion binary (.bin format) data

[Sourav Chatterjee]

Thanks Dave!
________________________________
From: Dave Allured - NOAA Affiliate <dave.allured at noaa.gov>
Sent: Friday, July 27, 2018 8:27 PM
To: Sourav Chatterjee
Cc: ncl-talk at ucar.edu
Subject: Re: [ncl-talk] Reading NSIDC sea ice motion binary (.bin format) data

Sourav,

According to the user guide on that website, this format is flat binary, signed 16 bit integers, three grids interleaved.  The three grids are U, V, and day counts.  You can read this file with the cbinread function.

You may also need the latitudes and longitudes, which are provided in separate files in their "tools" directory.  These are 4-column text files which can be read with the asciiread function.  Please try the attached sample NCL script, which reads both kinds of files.

Please see the first section "Daily Gridded and Mean Gridded Files" in their user guide.  After reading the raw data and coordinate files, you will need to apply a scale factor to U and V, as they describe.  You should also convert U and V from integer to float at the same time, to avoid loss of precision.  Depending on your application, you might also need to use the day counts grid to make a data mask.

When making plots, you will need to apply the latitudes and longitudes as 2-D coordinates, as described in other examples on the NCL website.

--Dave



From: Sourav Chatterjee <srvsxc at outlook.com<mailto:srvsxc at outlook.com>>

Date: Thursday, 26 July 2018 at 4:03 PM



Dear NCL users



Can anyone help me out with reading the NSIDC EASE-Grid Sea Ice Motion Vectors data (.bin format) in NCL.



I have not used this format earlier in NCL, so clueless about it. Any help is appreciated.



A sample data is attached. The data format can be found in http://nsidc.org/data/nsidc-0116/versions/3

Polar Pathfinder Daily 25 km EASE-Grid Sea Ice Motion Vectors, Version 3 | National Snow and Ice Data Center<http://nsidc.org/data/nsidc-0116/versions/3>

Polar Pathfinder Daily 25 km EASE-Grid Sea Ice Motion Vectors, Version 3

nsidc.org<http://nsidc.org>




Thanks in advance

Sourav
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