Blog Archives

updating the GISS dataset

November 6, 2015
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updating the GISS dataset

Introduction I was watching a video of David Suzuki being interviewed on Australian TV, and there were some questions about the “pause” in temperature in the GISS dataset. I thought I’d like to check for myself, and reasoned that I may as well update the giss dataset in the ocedata R package. As always seems to be the case, the data format is changed...

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trimming CTD files with shiny

October 17, 2015
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trimming CTD files with shiny

Introduction The shiny library provides a graphical user interface (GUI) for the R language that may open up new possibilities for human judgement in data filtering, as well as for the use of R by those who choose not to learn its syntax. The first category is the intended audience here, in this first of a series of blog postings about using shiny...

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email graphs

August 24, 2015
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email graphs

Communication between individuals working on a group project is commonly carried over email, and in-person meetings tend to be preceded by an emailed agenda, and followed by emailed minutes. Projects organized around GitHub or similar systems tend also to have email updates for issue reports, etc. All of this means that a graph of email timing can be helpful in indicating...

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Comparing World Ocean Atlases 2013 and 2013v2

August 21, 2015
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Comparing World Ocean Atlases 2013 and 2013v2

Introduction The ocedata package provides data that may be of use to oceanographers, either working with their own R code or working with the oce package . One such dataset, called levitus, holds sea surface temperature and salinity (SST and SSS), based on the 2013 version of the World Ocean Atlas. An updated version of this atlas is suggested by the WOA...

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ITS-90 temperature scale

May 9, 2015
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Introduction Recently, oce has been gaining flexibility in terms of conductivities stored in data files. This is necessitated by the fact that RBR files store conductivity in mS/cm, whereas calculations for seawater properties use the unitless conductivity ratio. With the CTD code under examination for this work, it might make sense to also handle temperatures stored in files. The two choices for that seem...

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map projections in oce

April 2, 2015
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map projections in oce

Introduction The latest version (4.9.0) of the PROJ.4 library is being incorporated into the development version of the oce R package. The work is not finalized yet, but I thought it might be useful to share an early version of the test suite, so people could get an idea of the upcoming capabilities. Note that some projections work quite poorly in oce at the...

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scientific notation for R/latex

March 21, 2015
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scientific notation for R/latex

Motivation Using R within a latex document can be a component of reproducible research, offering (a) some assurance against typographical errors in transcribing results to the latex file and (b) the ability for others to reproduce the results. For example, one might like to explain how close the computed integral of the Witch of Agnesi function 1 2woa <- function(x, a=1) 8 * a^3 / (x^2 +...

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Solar eclipse

March 19, 2015
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Solar eclipse

Introduction Today there was a solar eclipse that was not visible on my side of the Atlantic, but was seen on the European side, either as a partial eclipse, towards the south, or a total one, towards the north . Eclipses being rare and solar power being a new thing, this event caused unprecedented reduction of solar power . A good spot for viewing the...

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Assessing mapdata world coastline

January 27, 2015
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Assessing mapdata world coastline

Introduction The mapdata R package contains a coastline called worldHires which is contained within a text file with a bit over 2 million lines. Since the coastlineWorldFine dataset in the ocedata package contains about 0.5 million points, I thought I would explore how much better the mapdata coastline might be. Methods First, I wrote the following C file to translate the...

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World Ocean Atlas changes

January 25, 2015
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World Ocean Atlas changes

Introduction The ocedata R package has a dataset named levitus, which stores sea-surface temperature and salinity. Today, the development version of ocedata (available at github) was updated from the 2009 version of this atlas to the 2013 version. Differences between the two datasets are illustrated here. Methods The code provided below requires that the old dataset be saved into an RDA...

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