[ncl-talk] Reading binary files

[Manisha Ganeshan]

Thanks, Dennis! I'm trying to geo reference the data to plot it on a polar
stereographic map projection. But I only have information regarding the map
projection and grid spacing in km (below). Can NCL perform coordinate
transformation to estimate lat lon variables from the given information? I
think the data is intended for use with ArcGIS and similar software so they
don't come with lat lon coordinates.

Thanks,
Nisha
Projection
World Geodetic System 1984 (WGS 84) is the reference ellipsoid and datum.
The projection is polar stereographic with a standard parallel of 71° S and
origin of the South Pole.

Grid Description

The grid is a 1 km grid of 5601 by 5601 grid boxes centered symmetrically
about the pole. Grid size of 1 km is an optimization of resolution and
interpolated cells, resulting in less than 32 percent of grid cells having
interpolated values.

On Sun, Jul 9, 2017 at 9:18 AM, Dennis Shea <shea at ucar.edu> wrote:

> The attached does a simple read-and-plot. The plot does not have any
> geographic referencing.
>
> On Sat, Jul 8, 2017 at 9:01 PM, Manisha Ganeshan <
> manisha.ganeshan86 at gmail.com> wrote:
>
>> Hi Barry,
>>
>> I found some info on ENVI header files, and was able to figure out the
>> data format, dimensions, and read the data successfully. Still trying to
>> figure out the map and projection details, but I think that will be easier
>> to do. Will let you know if I have further trouble.
>>
>> Thanks,
>> Nisha
>>
>> On Sat, Jul 8, 2017 at 9:49 PM, Manisha Ganeshan <
>> manisha.ganeshan86 at gmail.com> wrote:
>>
>>> Dear NCL community,
>>>
>>> I'm trying to read a binary file without much success. I have tried
>>> asciiread and fbindirread functions, but the problem is I'm not sure what
>>> to enter in the data type field. There is not much information in the
>>> header file nor in the data description (web link below). The variable I am
>>> expecting to read is surface elevation (likely in meters), but no matter
>>> what data format I attempt to read, I don't seem to get reasonable values.
>>> Any leads on how to proceed will be much appreciated. The actual binary
>>> data file and the header file are available for download from the weblink
>>> below.
>>>
>>> Thanks,
>>> Nisha
>>>
>>> Weblink describing the data
>>> *http://nsidc.org/data/nsidc-0422 <http://nsidc.org/data/nsidc-0422>*
>>>
>>>
>>> Download link for binary file and header file
>>> *https://opendrive.gsfc.nasa.gov/shortauth/z/b3zIg8ah
>>> <https://opendrive.gsfc.nasa.gov/shortauth/z/b3zIg8ah>*
>>> --
>>> Dr. Manisha Ganeshan
>>> Universities Space Research Association
>>> Maryland, U.S.A.
>>>
>>
>>
>>
>> --
>> Dr. Manisha Ganeshan
>> Universities Space Research Association
>> Maryland, U.S.A.
>>
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>


-- 
Dr. Manisha Ganeshan
Universities Space Research Association
Maryland, U.S.A.
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