# Chad Greene

### NASA Jet Propulsion Laboratory

I am interested in the floating ice shelves that fringe East Antarctica. My current work is toward building a better understanding of how climatology influences glaciology via oceanography. I also have some experience with the acoustics of gas hydrates and oceanic methane bubbles.

Homepage: www.chadagreene.com

Professional Interests: Antarctic ice shelf dynamics, sea level rise, underwater acoustics, methane hydrates

Note: I will not do your homework for you and I will not respond to emails directing me to a question posed on the Answers forum.

**Statistics**

RANK**35**

of 242 634

REPUTATION**4 629**

CONTRIBUTIONS

**86** Questions

**1 009** Answers

ANSWER ACCEPTANCE **
56.98%
**

VOTES RECEIVED**2 107**

RANK**22** of 17 000

REPUTATION**24 858**

AVERAGE RATING**4.70**

CONTRIBUTIONS**176** Files

DOWNLOADS **1809**

ALL TIME DOWNLOADS**214424**

CONTRIBUTIONS**0 Posts**

CONTRIBUTIONS**0** Public Channels

AVERAGE RATING

CONTRIBUTIONS**0** Highlights

AVERAGE NO. OF LIKES

**Content Feed**

Stereographic plot of Sea Surface Temperature Data around Antarctica.

Hi Ravi, There are a couple of ways to do this. Here's one way: Turn your vectors of latitude,longitude coordinates into 2D ...

8 jours ago | 0

Submitted

gridbin

A MATLAB function for gridding large datasets of scattered data.

environ un mois ago | 12 downloads |

Submitted

maskoverlay

A MATLAB function to easily overlay a mask.

environ un mois ago | 10 downloads |

Submitted

fast-ice

Matlab functions for loading Alex Fraser's fast ice dataset.

environ 2 mois ago | 3 downloads |

plot using latitude and longitude

That looks like you have scattered data. If you have an array of latitudes, an array of longitudes, and a corresponding array of...

4 mois ago | 0

| accepted

polybuffer distance in meters?

I think you've got it right, Alex, but this calls for an explanation of the phrase numeric scalar. The word numeric just means a...

4 mois ago | 1

| accepted

ploting 2d graph of a vector

You've pretty much got it, but you'll need to define a range of t values, and a value for the constants A, and B. You also need ...

5 mois ago | 0

| accepted

Submitted

Climate Data Toolbox for MATLAB

A set of low-level functions and tutorials for analyzing and displaying Earth science data.

5 mois ago | 267 downloads |

Specific color corresponding to specific data using contourf colormap

Perhaps @Kelly Kearney's contourfcmap is what you need?

5 mois ago | 0

Make a vector plot of the velocity field in polar coordinates

Can you use cart2pol to convert the coordinates and vector components to polar coordinates?

5 mois ago | 0

Why ?? Undefined function 'crosscorr' for input arguments of type 'double'.

crosscorr is part of the econ toolbox. If you don't have that toolbox, you can probably rewrite your code to use xcorr instead. ...

5 mois ago | 0

Fit data recorded with different internal clocks

This is an interesting problem. If you can identify a few peaks that occur throughout the 600 s measurement, and those peaks are...

5 mois ago | 0

| accepted

How to create map with [x;y] coordinates? Mapping toolbox

No guaratees on the accuracy of the attached functions, but you may be able to convert between lat,lon and x,y using the attache...

5 mois ago | 0

| accepted

How can i solve for this issue with the logical flow

I think the error is here: term3=q(i-1)*((r(i)-dr)/r(i)*dr); The first time through the loop, i=1, meaning i-1=0. There is no...

5 mois ago | 0

| accepted

Adding line change the size of the image

Can you get the axis limits before plotting the lines, and then set the axis back to those limits afterwards? Something like thi...

5 mois ago | 0

Color along line in polaraxes

What if you interpolate along a dense line and plot with polarscatter? I'm thinking something like this: theta = linspace(0,...

5 mois ago | 0

| accepted

How to make a surface plot of imported data of a numerical function z=f(x,y)

Just to be clear, you already have the data, and it takes this form M = [x y z]; where x, y, and z are columns? My next qu...

5 mois ago | 0

time position in graphic

This question is pretty vague, but here's pi displayed at the bottom right corner of a plot: txt = text(1,0,num2str(pi,'%4i'),...

5 mois ago | 1

| accepted

I have a climatic dataset of a region where I am calculating time series (for drought index). The dimension of the dataset is 164*153*1416 (1416 months in the dataset and the others are the location). How I can average this over space and time?

To get a map of average SPEI, SPEI_mean = mean(SPEI,3,'omitnan'); and that calculates the mean along the third dimension (ti...

5 mois ago | 0

| accepted

Antarctic Mapping Tool: how can I evaluate the distance of a point from the coastline?

The easiest solution is the dist2mask function in the Antarctic boundaries add-on for AMT. Syntax is d = dist2mask('openocean'...

5 mois ago | 0

How to mask a 3-D raster using a multiple feature attribute shapefile?

Try this: mask = inpolygon(X,Y,[roi.X],[roi.Y]); You don't even need to remove the trailing nans. :)

5 mois ago | 0

how to turn netcdf into contour map

Hi Abigail, The first thing I do with a netcdf file is type ncdisp('myfile.nc') to see what's inside it. If you have some ...

5 mois ago | 0

| accepted

Extracting data from matrix

To only plot the ocean data, try masking out the land data by setting those values in A to NaN. like this: A(B==1) = NaN; % se...

5 mois ago | 0

| accepted

Equal Sized random assortment, using randi?

This would be one way to define how many ones and how many twos in each column before randomizing them: N_cols = 8; % number o...

5 mois ago | 0

PCA Graph of Data Comes Up Blank

I think you're mixing and matching different ways of defining filenames. As a result, dir is unable to find the files you're loo...

5 mois ago | 0

datestr generating different string

How about myy = 2014; mym = 1; myd = 20; datestr(datenum(myy,mym,myd),'dd/mm/yyyy')

5 mois ago | 0

| accepted

Three column table into matrix

I think table2array is the function you're looking for.

5 mois ago | 1

How to find data points within 2% tolerance of curve

Sounds like a nice homework problem. You'll probably want to use logical indexing to find the indices of the Y data that are w...

5 mois ago | 0

| accepted

Plotting multiple graphs from multiple ranges in excel

The easiest way is probably to read the full range of data all at once, then loop through the different ranges you want to plot....

5 mois ago | 0

Getting a filter error today when yesterday didn't?

I suspect that yesterday you weren't including x in the filter. Yesterday you were filtering the d signal, which is just [1 0 0 ...

5 mois ago | 0