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.

Answered

using 'fit' to add a trend line to series of scatter points

That is the correct first-order least-squares fit. But I think in your plot the '.' marker on the far left side is coincident wi...

using 'fit' to add a trend line to series of scatter points

That is the correct first-order least-squares fit. But I think in your plot the '.' marker on the far left side is coincident wi...

16 dagen ago | 0

| accepted

Question

2D gaussian filter with a variable sigma

I have a large gridded dataset I'd like to lowpass filter. The catch is, need to specify a different sigma value for each pixel ...

18 dagen ago | 1 answer | 0

Answered

How can I get a mask matrix from a fill?

Perhaps you want to use inpolygon to get a mask of grid cells within the polygon?

How can I get a mask matrix from a fill?

Perhaps you want to use inpolygon to get a mask of grid cells within the polygon?

ongeveer een maand ago | 0

Answered

How can I make an image with both ocean and land information?

This is very easy with the Climate Data Toolbox for Matlab! First, plot the base image with earthimage, then overlay it with a p...

How can I make an image with both ocean and land information?

This is very easy with the Climate Data Toolbox for Matlab! First, plot the base image with earthimage, then overlay it with a p...

ongeveer een maand ago | 0

Answered

How can I interpolate an ocean's variable without interpolate the continents?

You can use the island function in the Climate Data Toolbox for Matlab to determine which grid cells are land and which ones are...

How can I interpolate an ocean's variable without interpolate the continents?

You can use the island function in the Climate Data Toolbox for Matlab to determine which grid cells are land and which ones are...

ongeveer een maand ago | 0

Answered

Can anyone help plot the India map showing land and oceans, without using mapping toolbox ??

For this you can use the earthimage function in the Climate Data Toolbox for Matlab. It does not require the Mapping Toolbox.

Can anyone help plot the India map showing land and oceans, without using mapping toolbox ??

For this you can use the earthimage function in the Climate Data Toolbox for Matlab. It does not require the Mapping Toolbox.

ongeveer een maand ago | 0

| accepted

Answered

How to perform EOF

I think the easiest way is with the eof function in the Climate Data Toolbox for Matlab. Check out the documentation, it describ...

How to perform EOF

I think the easiest way is with the eof function in the Climate Data Toolbox for Matlab. Check out the documentation, it describ...

ongeveer een maand ago | 0

Answered

Globe display issue - need opaque sub-surface

For the globe functions in the Climate Data Toolbox for Matlab I had to include one called globefill, for that very purpose. If ...

Globe display issue - need opaque sub-surface

For the globe functions in the Climate Data Toolbox for Matlab I had to include one called globefill, for that very purpose. If ...

ongeveer een maand ago | 0

Answered

How can you plot lines of latitude and longitude on a globe without using the mapping toolbox ?

I turned my answer into a collection of functions called globeplot, globesurf, globegraticule, globeborders, etc. which you can ...

How can you plot lines of latitude and longitude on a globe without using the mapping toolbox ?

I turned my answer into a collection of functions called globeplot, globesurf, globegraticule, globeborders, etc. which you can ...

ongeveer een maand ago | 0

Answered

how to write data on grid in a plot?

That looks like a heatmap chart. However, a 181x361 grid of text values will probably be illegible. On most screens that's only ...

how to write data on grid in a plot?

That looks like a heatmap chart. However, a 181x361 grid of text values will probably be illegible. On most screens that's only ...

ongeveer een maand ago | 0

Answered

How to calculate the area of each grid cell?

The easiest way is to use the cdtarea function in the Climate Data Toolbox for Matlab. For gridded coordinates Lat,Lon, syntax i...

How to calculate the area of each grid cell?

The easiest way is to use the cdtarea function in the Climate Data Toolbox for Matlab. For gridded coordinates Lat,Lon, syntax i...

ongeveer 2 maanden ago | 0

| accepted

Answered

Plot a point of my gridded map

If you know the grid indices, it would just be sst1 = squeeze(sst(row,col,:)); where the corresponding geo coordinates would...

Plot a point of my gridded map

If you know the grid indices, it would just be sst1 = squeeze(sst(row,col,:)); where the corresponding geo coordinates would...

ongeveer 2 maanden ago | 0

Answered

Writing a loop to calculate a seasonal cycle and then plot the seasonal cycle?

Check out the season and climatology functions in the Climate Data Toolbox for Matlab. The functions make it easy to extract sea...

Writing a loop to calculate a seasonal cycle and then plot the seasonal cycle?

Check out the season and climatology functions in the Climate Data Toolbox for Matlab. The functions make it easy to extract sea...

ongeveer 2 maanden ago | 0

Answered

Can't plot a trendline

Check out the polyplot function in the Climate Data Toolbox. If you define the x and y data, plotting a least-squares trend line...

Can't plot a trendline

Check out the polyplot function in the Climate Data Toolbox. If you define the x and y data, plotting a least-squares trend line...

ongeveer 2 maanden ago | 0

Answered

Help with plotting world grid climate variable lat/lons

Hi Macarena, I wrote the recenter function in the Cimate Data Toolbox to do exactly what you want to do. It lets you move a ...

Help with plotting world grid climate variable lat/lons

Hi Macarena, I wrote the recenter function in the Cimate Data Toolbox to do exactly what you want to do. It lets you move a ...

ongeveer 2 maanden ago | 0

Submitted

The Climate Data Toolbox for Matlab

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

2 maanden ago | 70 downloads |

Answered

How to apply hatched region to a polar map

For anyone who wants to do this with Antarctic Mapping Tools, you may be able to use my stipple function. For a lat,lon grid and...

How to apply hatched region to a polar map

For anyone who wants to do this with Antarctic Mapping Tools, you may be able to use my stipple function. For a lat,lon grid and...

2 maanden ago | 1

Submitted

tile

Easily determine indices to break a large 2D matrix into smaller tiles.

3 maanden ago | 0 downloads |

Submitted

cmocean perceptually-uniform colormaps

Perceptually-uniform colormaps inspired by oceanography

3 maanden ago | 166 downloads |

Answered

How can I create a gif that plays only once?

Use my gif function! Just type gif('myfile.gif','LoopCount',1) for the first frame and then gif to write each subse...

How can I create a gif that plays only once?

Use my gif function! Just type gif('myfile.gif','LoopCount',1) for the first frame and then gif to write each subse...

4 maanden ago | 1

Answered

How do I filter my data points without using smoothdata?

What about movmean to smooth the data, then interp1 to pick out the 5 points you want?

How do I filter my data points without using smoothdata?

What about movmean to smooth the data, then interp1 to pick out the 5 points you want?

4 maanden ago | 0

Answered

How do I read an image file in .fits format and convert it to.png or .tiff?

You should be able to read it with fitsread and then save it to png or tiff with imwrite.

How do I read an image file in .fits format and convert it to.png or .tiff?

You should be able to read it with fitsread and then save it to png or tiff with imwrite.

4 maanden ago | 1

Answered

How to create a only a time vector starting 13:15:00 to 20:59:00 with 1 minute interval? R2016a

This is a datetime for today, starting at 13:15 and going to 20:59, in 1 minute [1/(24*60)] intervals. t = datetime(2018,12,11...

How to create a only a time vector starting 13:15:00 to 20:59:00 with 1 minute interval? R2016a

This is a datetime for today, starting at 13:15 and going to 20:59, in 1 minute [1/(24*60)] intervals. t = datetime(2018,12,11...

4 maanden ago | 0

| accepted

Answered

time series comparison metric

The simplest way is just to compare the standard deviations of each signal: st1 = std(d1); st2 = std(d2); Although that ap...

time series comparison metric

The simplest way is just to compare the standard deviations of each signal: st1 = std(d1); st2 = std(d2); Although that ap...

4 maanden ago | 0

| accepted

Answered

Make x axis ticks and extent match

You're on the right track. If you want all the xticks to be the same, then you'll have to set them all to the same values. Curre...

Make x axis ticks and extent match

You're on the right track. If you want all the xticks to be the same, then you'll have to set them all to the same values. Curre...

4 maanden ago | 0

Answered

Why the EOF gives the total of 99.9

This line in caleof is the culprit: expvar(iN)=fix((dsum(iN)*100/sum(dsum))*10)/10; The fix function rounds down. The part th...

Why the EOF gives the total of 99.9

This line in caleof is the culprit: expvar(iN)=fix((dsum(iN)*100/sum(dsum))*10)/10; The fix function rounds down. The part th...

5 maanden ago | 0

Answered

How to change figure size?

The paper size options are for printing, so they don’t change the size of the figure. The ‘Position’ property sets the size of ...

How to change figure size?

The paper size options are for printing, so they don’t change the size of the figure. The ‘Position’ property sets the size of ...

5 maanden ago | 14

| accepted

Answered

How do I create a color bar to correspond to my jet color scheme?

Try this: Plot some data: surf(peaks) Change the colormap*: colormap(jet) Add a colorbar and put a label on it: cb = ...

How do I create a color bar to correspond to my jet color scheme?

Try this: Plot some data: surf(peaks) Change the colormap*: colormap(jet) Add a colorbar and put a label on it: cb = ...

5 maanden ago | 0

| accepted

Answered

creating subplot from function

Looks like instead of |x| you meant to call that variable |fname|? If so, something like this: fname = {'fname1.txt','fname...

creating subplot from function

Looks like instead of |x| you meant to call that variable |fname|? If so, something like this: fname = {'fname1.txt','fname...

5 maanden ago | 0

Submitted

Antarctic Mapping Tools

A toolbox for analysis and display of Antarctica-related data

6 maanden ago | 34 downloads |