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https://github.com/chadagreene/its_live

Matlab utilities for loading, analyzing, and plotting ITS_LIVE ice velocity data.
https://github.com/chadagreene/its_live

alaska antarctica arctic glacier glaciers glaciology greenland hma its-live itslive matlab nasa patagonia svalbard velocity

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Matlab utilities for loading, analyzing, and plotting ITS_LIVE ice velocity data.

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README 

        
[![View ITS_LIVE Antarctic ice velocity data on File Exchange](https://www.mathworks.com/matlabcentral/images/matlab-file-exchange.svg)](https://www.mathworks.com/matlabcentral/fileexchange/72701-its_live-antarctic-ice-velocity-data)



![ITS_LIVE](https://its-live-data.s3.amazonaws.com/documentation/ITS_LIVE_logo_transparent_wht.png)



# Functions for MATLAB 

These MATLAB functions are intended to make it easy and efficient to work with [ITS_LIVE](https://its-live.jpl.nasa.gov/) velocity data. 



![ITS_LIVE](itslive_velmap.jpg)



## Function List 

**`itslive_mosaic_downloader`** easily downloads all of the annual mosaics for any specified region. 



**`itslive_data`** loads ITS_LIVE velocity mosaic data.



**`itslive_interp`** interpolates ITS_LIVE velocity mosaic data to specified locations. 



**`itslive_tilefun`** You probably won't need this function, but it loads multiple years of ITS\_LIVE velocity mosaic data in tiles and applies a specified function through time. Tiling is only necessary when memory issues arise when trying to load and process multiple years of ITS\_LIVE data all at once. (Requires the Climate Data Toolbox for Matlab.)



**`itslive_imagesc`** plots itslive velocity magnitude (speed) data as an `imagesc` plot. If an AMT polar stereographic map is already open, `itslive_imagesc` will only load and plot enough data to fill the current map. 



**`itslive_quiver`** is equivalent to `itslive_imagesc`, but plots ITS_LIVE velocity data as quiver arrows. 



**`itslive_contour`** is equivalent to `itslive_imagesc`, but plots contours instead of scaled color. 



**`itslive_flowline`** calculates flowlines from itslive velocity mosaics. 



**`itslive_displacement`** similar to `itslive_flowline`, but calculates the position of point(s) after a specified time interval. For example, where was a certain grid point 3.5 year ago? Enter its coordinates with a dt value of -3.5 to find out. 



**`itslive_tsplot`** plots a single grid cell of IT_LIVE velocity observations as a timeseries plot. 



## Requirements 

Since these functions are currently just for the Antarctic, they rely on [Antarctic Mapping Tools for Matlab](http://www.mathworks.com/matlabcentral/fileexchange/47638), so you'll need to get that package if you don't already have it. 



## Downloading data

If you don't already have the velocity data, download the NetCDF version of the velocity data for your years of interest [here](https://nsidc.org/apps/itslive). If you only want the mosaic, I recommend the 240 m composite, which provides the error-weighted synthesis of all available data. 



After downloading the data, put the NetCDF(s) somewhere Matlab can find them. I personally have a folder called `data`, and I have a [`startup.m`](https://www.mathworks.com/help/matlab/ref/startup.html) file in my home directory that contains this line:



`addpath(genpath('/Users/cgreene/Documents/MATLAB/data'))` 



which automatically adds the path to the `data` folder and all of it subfolders every time I start Matlab. 



## Citing this dataset 

The ITS\_LIVE data and these functions are provided free of charge. All we ask is that you please cite the dataset, and if you're feeling extra generous please do me a kindness and cite my Antarctic Mapping Tools paper too. Wording might be something like, "Velocity data generated using auto-RIFT (Gardner et al., 2018) and provided by the NASA MEaSUREs ITS\_LIVE project (Gardner et al., 2019). Analysis was performed with Antarctic Mapping Tools for Matlab (Greene et al., 2017)"



Gardner, A. S., M. A. Fahnestock, and T. A. Scambos, 2019 [update to time of data download]: ITS\_LIVE Regional Glacier and Ice Sheet Surface Velocities. Data archived at National Snow and Ice Data Center; doi:10.5067/6II6VW8LLWJ7.



Gardner, A. S., G. Moholdt, T. Scambos, M. Fahnstock, S. Ligtenberg, M. van den Broeke, and J. Nilsson, 2018: Increased West Antarctic and unchanged East Antarctic ice discharge over the last 7 years, _Cryosphere,_ 12(2): 521–547, doi:10.5194/tc-12-521-2018.



Greene, C. A., D. E. Gwyther, and D. D. Blankenship, 2017 “Antarctic Mapping Tools for Matlab.” _Computers & Geosciences,_ (104) 151–157, doi:10.1016/j.cageo.2016.08.003.