MATLAB Examples

accumulation_data documentation

This function returns accumulation data and corresponding geographic or polar stereographic coordinates.

This function requires Antarctic Mapping Tools.

Contents

This function plots Arthern's tif-formatted accumulation data, which can be downloaded here. Download it, unzip it, and make sure Matlab can find the data. Then you should be able to use the accumulation_data function.

Syntax

```Z = accumulation_data(lati,loni)
Z = accumulation_data(lati,loni,extrakm)
Z = accumulation_data(xi,yi,extrakm)
Z = accumulation_data(xi,yi)
Z = accumulation_data(...,'rms')
[lat,lon,Z] = accumulation_data(...)
[x,y,Z] = accumulation_data(...,'xy')```

Description

Z = accumulation_data(lati,loni) returns only enough accumulation data to fully encompass a set of points given by geo coordinates lati,loni.

Z = accumulation_data(lati,loni,extrakm) as above, but encompasses points lati,loni and adds a buffer of specified width extrakm in kilometers around all four sides of data points.

Z = accumulation_data(xi,yi) returns only enough accumulation data to fully encompass a set of points given by polar stereographic (-71) coordinates xi,yi.

Z = accumulation_data(xi,yi,extrakm) as above, but encompasses points xi,yi and adds a buffer of specified width extrakm in kilometers around all four sides of data points.

Z = accumulation_data(...,'rms') returns rms error estimates.

[lat,lon,Z] = accumulation_data(...) returns geo coordinates and elevation or mask data Z.

[x,y,Z] = accumulation_data(...,'xy') returns polar stereographic coordinates when the 'xy' tag is included.

Example

Accumulation on the Antarctic Peninsula:

```[lat,lon,A] = accumulation_data(-69.5,-65,[400 300]); pcolorps(lat,lon,A) axis tight antbounds('gl','k') antbounds('coast','k') cb = colorbar; ylabel(cb,'accumulation (mm/a)') ```

Overlay red error contours at 2 mm/a intervals:

```err = accumulation_data(-69.5,-65,[400 300],'rms'); contourps(lat,lon,err,8:2:20,'r'); caxis([350 1050]) ```

References

If this function is useful for you, please cite the following:

Arthern, R. J., D. P. Winebrenner, and D. G. Vaughan (2006), Antarctic snow accumulation mapped using polarization of 4.3-cm wavelength microwave emission, J. Geophys. Res., 111, D06107, doi:10.1029/2004JD005667.

Greene, C. A., Gwyther, D. E., & Blankenship, D. D. (2016). Antarctic Mapping Tools for Matlab. Computers & Geosciences. doi:10.1016/j.cageo.2016.08.003

Author Info

This function and supporting documentation were written by Chad A. Greene of the University of Texas at Austin's Institute for Geophysics (UTIG).