An Exercise in Uneven Data

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Presentation transcript:

An Exercise in Uneven Data Compiling Nutrient Data on CalCofi Line 67 for a Spring and Fall Cruise. Or: An Exercise in Uneven Data LT Anna C. (Christy) Bryant

CalCofi Grid

The Data None of the data was square Linear interpolation was used to square it Organization of data was critical for interpolation functions Not all cruises covered the same distances One was 425 km, one was 275 km Occasional instances of ‘no data’ Use of Linear Interpolation helped this for interior points

How Linear Interp Works Profile1=interp1(deep1,prof1,depth); where deep1 is your uneven data and depth is a matrix of your desired outcome: depth=[0:-5:-200]; Basically, you tell Matlab to create straight lines between the data points and get a value at distinct points along the line

“Squaring Data”

Some Data Points “no data”

Other “no data” points were treated...

Simple Static Displays Areas of No Data

Then to Animate... Animation of NO3 concentrations along CalCofi67 from the coast (east) to west for 425km Depth (m) NO3 Concentration

Creating Custom Animations..

Summary Data that is uneven in every respect becomes labor intensive to organize Display, once organized, is highly versatile using MatLab Keep the program should it ever happen to you!