New features

• The contour functions gain a clip argument to only show contours in an area defined by a polygon.
• The kriging argument of the contour functions now can be a numeric to control de number of pixels used.
• Documentation of FitWave() and friends improved (#184, @pascaloettli).

Breaking changes

• The proj argument in geom_contour_fill() and friends now operate over the isolines returned by the isoband package. This might break code that used a custom function to proj.

Bug Fixes

• Guides are compatible with the new versions of ggplot2 (#117 and #185, @teunbrand).
• Contour functions will work even if OutDec is not ".".

Breaking Changes

• The DivideTimeseries() function is now defunct.

New Features

• FitLm() gains a new intercept argument that allows you to remove the intercept term that is automatically added.

Bug Fixes

• Fixes error in Laplacian() when computing the laplacian of a single variable. (#170, Thanks @pascaloettli)
• Removes dependencies on raster and gdal packages.

New Features

• Not really a new feature per se, but all geoms now support the new linewidth aesthetic. geom_relief() and geom_shadow() now don't have a size aesthetic, since they shouldn't have had it anyway.
• The value of the maximum vector magnitude in scale_mag() is now chosen to be a "pretty" number close to the maximum. This will prevent guides with many unnecesary decimal places (thanks, @PanfengZhang #161).

Bug Fixes

• Documents the correct default expand value in sale_x_longitude() and friends (thanks, @tamas-ferenci, #167).
• Fixes inconsistencies in generic methods.

New features

• The new function Smooth2D() smooths a 2D field (hence the name). There are two smoothing methods. smooth_svd() computes the SVD of the field and reconstructs it keeping only the leading values that ensures a maximum variance lost. smooth_dct() computes the Discrete Cosine Transform of the field and sets a proportion of the components to zero.

Bug Fixes

• Fixed a bug in geom_streamline() when plotting multiple fields on the same panel.

• Fixes a bug with GetTopography() on Windows.

• Updates documentation to use valid HTML5 per CRAN's new format.

• Fixes the "The following aesthetics were dropped during statistical transformation" warning for contours.

• Removes ReadNetCDF() file and URL checking because it didn't work in some cases.
  (#164, thanks @pascaloettli)

Breaking changes

• Due to the udunits2 package being orphaned, ReadNetCDF() not longer uses it to parse dates and times. The homebrewed parser might be more limited, and the wild variety of netCDF files in the wild makes it hard to fully test. Please report any issues you have!

New Features

• Adds example of scale_y_level() (@paocorrales, #153).

• ReadNetCDF() now should parse times correctly even if the use non-standard calendars.
  This now makes udunits2 and PCICt required to parse time.

• Arrays returned by ReadNetCDF(…, out = "array") gain a "dimvalues" attribute which is analogous to dimnames but has the correct types (dates are dates, numerics are numerics, etc...).

• EOF() gains a new engine argument to chose the function to compute the singular value decomposition.

Bug Fixes

• Fixed wrong sdev component in EOF() when using base::svd() in some cases.
• seasonally() now returns a Date object even if the input is datetime. This avoids issues when the time component of the input was not all the same.
• Fixed a bug in ImputeEOF() in which the algorithm tried to compute 0 EOFs.

New Features

• geom_contour2() gains the ability to draw --and leave space for-- labels! This is finally proper labelling support without having to use a different geom (geom_text_contour()). Thanks to the isoband package for this.

• Following isoband's naming convention, the family of functions that decide where to place labels have been renamed as label_placer_ and the corresponding argument is now label.placer. The label_placement_ family of functions will be deprecated in future releases.

New Features

• discretised scales now work better when passing user-supplied limits.

• New functions to use the International Standard Atmosphere to get height from pressure and vice versa, as well as to use as secondary axis.
  See ?standard_atmosphere.

• scale_y_level() and scale_x_level() now print more breaks by default.
  These functions will probably use this transformation instead of the reverse log transformation in a future release.

• Translation!
  Thanks to @MichaelChirico priceless guidance, metR messages are now translatable and already translated to Spanish.
  If you are using R in a Spanish locale you should be getting messages and error in Spanish.
  Partial translation to Portuguese is also included.

• During the process of translating messages, many messages were improved and made more consistent.

• New Function ResidLm() that returns the residuals of a linear fit.

• New function Detrend() that, you guessed it, returns a (linearly) detrended version of the input vector.

• In ReadNetCDF(), the "vars" argument now can take a function. (#142)

• Discretised scales now support user-defined breaks.

Bugfixes

• seasonally() result will be on the 15th of the centre month of each season instead of on the 1st. This makes the date more representative of the time span and also solves a bug in which dates on the 31st would return NA. This is a potentially breaking change.
• ReadNetCDF() doesn't fail when reading variables with no dimensions (thanks to @paocorrales, #141).

New Features

• as.discretised_scale() is a quick way of created a discretised version of any
  continuous scale.

• stroke.colour is now an accepted aesthetic for geom_text_contour().

Bugfixes

• The computations in MixingRatio() were wrong. Now they are fixed.

• I really wanted geom_arrow() to automatically add the arrow legend, but the
  workarounds I managed to write were brittle and couldn't handle even slight
  changes in people's code (see https://github.com/eliocamp/metR/issues/130). The definitive
  answer is that this is simply not possible due to limitations on how ggplot2 works
  (see https://github.com/tidyverse/ggplot2/issues/4291).
  This release, then, backtracks those workarounds and tries to accept the things I cannot change.

New Features

• I'm very happy with discretised_scale(), which is a type of scale which takes a
  discrete values that are the result of some discretisation and treats them as
  continuous. It's, in a sense, the inverse of the new ggplot2::binned_scale().
  Whereas. ggplot2::binned_scale() takes continuous values and then discretises
  them, discretised_scale() takes discrete values which where the result of some
  discretisation procedure (such as the levels of geom_contour_fill()/ggplot2::geom_contour_filled())
  and allows you to treat them as continuous.

• Related to that, geom_contour_fill() now gains a new computed aesthetic called level_d,
  which is the same as level but forces ggplot2 to automatically use the new discretised scale.

• AnchorBreaks() gains a bins argument to mimic the default functionality of
  MakeBreaks().

• New label_placement_minmax() to label contours at the maximum and minimum
  points of a contour (mimicking isoband's behaviour)

• geom_contour_tanaka() now has a (rather experimental) argument smooth which allows to smooth
  the transition between segments.

Bugfixes

• Fixes error introduced in previous version when geom_arrow() had mappings other
  than dx and dy. (Thanks Santiago!)

• The level derived aesthetic from geom_contour_fill() now returns and ordered factor
  with the correct labels that can be interpreted by ggplot2::guide_colorsteps(). This might
  a breaking change!

• geom_label_contour() lives! The previous release rewrote much of the way geom_text_contour()
  worked, but I messed up and didn't realised that the new code had broken geom_label_contour()
  (to be honest, I'd almost totally forgotten about it :P). (fixes #126, thanks @kongdd)

New features

• FitWave() and related functions return NAs when the inputted signal has NAs.

• FitLm() accepts a weights argument to perform weighted regression.

• ReadNetCDF() now can read files directly from DAP servers and other urls, and
  objects returned by [ncdf4::nc_open()].

Bugfixes

• ReadNetCDF() won't try to parse "time" dimensions that are not dates and will try
  to parse as time all dimensions.

Breaking changes

• seasonaly() is now correctly called seasonally(). This proves that you don't
  put an ESL person in charge of naming stuff.

New features

• EPflux() computes Eliassen-Palm fluxes (experimental).

• geom_arrow() and geom_vector() should plot faster.

• New functions is.full_season() and seasonaly().

• FitLm() returns model $r^2$ and adjusted $r^2$.

• FitLm() adds names to unnamed terms.

• New function WaveEnvelope() that computes... the wave envelope.

• geom_contour2(), geom_contour_fill() and geom_text_contour() now accept a global.breaks
  argument that controls whether breaks should be computed once using the range of the whole
  dataset or once for every grouping (e.g. faceting). TRUE (the default) ensures that
  intervals between contours are comparable between panels. Setting it to FALSE computes
  contours compatible with ggplot2::geom_conotur() (#109, thanks @freeseek)

Bugfixes

• A reworked non-equispaced derivative gives better results in Derivate().

• ReadNetCDF() will not fail if the first variable was called "v" (yeah, I know.. weird
  error related to data.table's non standard evaluation).

• Subsets in ReadNetCDF() won't fail if no element is named (#107, thanks @m-saenger)

• Fixed bug in WaveFlux() (#110, thanks @salvatirehbein)

Internals

• Cleaned up a lot of dependencies. Some are gone (they were not longer needed) and some
  have been moved to Suggest. Overall metR should now be a bit lighter to install.

New features

• ReadNetCDF() suports using NA in subset to refer to max or min value.

• ReadNetCDF()'s subset argument supports more complex queries. (see the help
  section at?ReadNetCDF()).

• ReadNetCDF() now has a simple date-time parser that is tried if the udunits2 package
  is not installed.

• GetSMNData() gains the ability to cache results in a file.

• Derivate() now can derive in a non-equispaced grid.

Bugfixes

• geom_contour_fill() imputation method is fixed for some special cases (#96; thanks @bergmul).

• predict.eof() handles complex value svd correctly.

• Accommodates new grid implementation of units (#105 thanks @pmur002).

New features

• New GlanceNetCDF() function that is an alias for ReadNetCDF(out = "vars") but now prints a human readable summary of the contents of the NetCDF file.

• ReadNetCDF() is slightly faster and should use less memory.

• ReadNetCDF() supports more complex subsetting operations now.

• geom_streamline() now uses 4th order Runge-Kutta insteaf of plain old Euler. It also draws arrows in the middle of the streamline.

• The df element returned by FitLm() now has the same length as the rest.

Bugfixes

• ReadNetCDF() result will print correctly.

Not a lot of changes in this release. It was mostly forced by a change in sample() coming to R that broke some tests.

Some bugfixes and a bit of breaking changes that should not affect too many people. Trajectory() is a new function that, as it says in the tin, computes trajectories. Is similar to geom_streamlines() but for a time-varying field. Is still not fully documented, but works.

New features

• Anomaly() has a new baseline argument.

• New function Trajectory() that computes trajectories in time-varying
  velocity fields.

Bugfixes

• ReadNetCDF() now accepts dates as elements for subset.

• ReadNetCDF() will read all dates correctly (#91; thanks to @m-saenger).

Breaking changes

• The es argument from MixingRatio() changes to e, to be consistent with
  the rest of the variables. Sorry, thermodynamics is not my forte! (thanks @PaoCorrales)

• Arrow heads in geom_arrow() are now scaled correctly in faceted plots (fixes, #92; thanks to @m-saenger)

We are on CRAN!

This version marks the first CRAN release. I feel that the package is now mature enough in robustness (there are tests, arguments are checked and the interface is fairly consistent) and functionality so that I'm confident on people using it.

Breaking changes

There has been some changes in the interface of some functions for the sake of
consistency.

• In Derivate() (and it's derivated functions --see what I did there?), the
  data argument has been moved back. This is because this function is intended to
  be called inside a data.table of mutate() call, where you don't need to
  explicitly specify the data.

• In EOF() the dcast-style formula interface has been removed. The data argument
  was also moved back so you can use the n argument more easily without naming it.

• ImputeEOF() follows the same conventions. The dcast-style interface has been
  removed and the data argument has been moved after the max.eof argument.

• BuildQsWave() and FitQsWave() have been removed and should had never even
  existed.

• The default skip argument for geom_text_contour() is now 0.

• Removed hemisphere argument from season() since the function returns the
  trimester so it made no sense.

• Contour functions now compute breaks globaly (using all the data) instead of
  per panel. This means default intercomparabilty between facetwed plots but also
  a considerable deviation from ggplot2::geom_contour().

• The Between operators are removed since they were already implemented in
  data.table.

• The default geom for stat_na() is changed to point for consistency with
  stat_subset()

Other changes

• Arrows in geom_arrow() and geom_vector() scale with vector magnitude.
• New geom geom_streamline() for visualizing vector fields.
• Utilities dlon(), dlat(), dx(), dy() for converting physical units into
  spherical units.
• New geom geom_contour_tanaka() that plots illuminated contours.
• New function Interpolate() for bilinear interpolation.
• Fixed bug in FitWave() with wavenumber 0. Now it rerturns the mean.
• FitWave() runs slightly faster and BuildWave() runs much faster.
• Removed GeomContourFill object since it was just a polygon.
• The results from EOF() now use factors instead of numbers to identify each
  PC
• New scale scale_mag() and guide guide_vector() for controlling and
  communicating the scale of vectors. These are highly experimental and will
  change in the future, but provide some very needed functionality so I decided to
  export them as they are.
• geom_arrow() gains new pivot agument to control point of rotation and
  preserve.dir to tell if angle should be preserved.
• stat_contour_fill() and stat_contour2() print a warning when no contours
  can be made.
• EOF() now supports estimation of confidence intervals via bootstrap.
• EOF() supports varimax rotation. Rotated components are labeled accordingly.
• geom_relief() is much faster now (but see package rayshader).
• New geom_shadow() for casting shadows in topographic maps.
• Contour calculations in StatContour2 are
  memoised so they are
  only computed once even adding several layers with the same contours
  (geom_contour() + geom_text_contour()) or running the same plot while tweaking
  it's appearance.
• New FitLm() for getting fast estimates of linear fits.
• New FilterWave() for filtering waves.
• Circular dimensions had quite a ride during this developement process. RepeatCircular() was deprecated in favour of WrapCircular() which is more
  robust, and then WrapCircular() was deprecated in favour of the ggperiodic package.
• The way that stat_contour2(), stat_contour_fill() and geom_streamlines()
  handle circular dimensions has changed. Now you need to use xwrap/ywrap to
  explicitly set the domain. This makes the implementation more robust and also allow to easily wrap to an arbitrary domain.
• After that change, the wrapping functionallity has moved to ggperiodic, which
  can handle this stuff better. The above mentioned arguments still work but are not
  documented and will be deprecated.
• EOF() gains a fill argument for sparse-ish data.
• geom_text_contour() now has the ability to draw a stroke around text.
• geom_contour_fill() now can impute missing values with bivariate interpolation.
• BuildField() actually renamed BuildWave() (which should've happen in the previous
  release acording to this News).
• New function as.path() and added functionality to Interpolate() that allows
  to interpolate values along a path of locations.
• New function Impute2D() which is an exported version of the method used by
  geom_contour_fill() to (soft) impute missing values.
• subset argument in ReadNetCDF() now accepts character vectors for time
  components.

metR 0.1

• New function: GetTopography()
• ReadNetCDF() now can output arrays and vectors.
• Changed name.
• New website (https://eliocamp.github.io/metR/) with documentation. Thanks to pkgdown.
• New functions: coriolis() and coriolis.dy().
• Faster Anomaly() (can't believe I did that).
• EOF() principal componets are numeric instead of "PC1", etc...
• For consistency with stat_contour() created geom_contour_fill() which
  works just like stat_contour_fill().
• Added stat_na() for easy masking of NA values.
• geom_arrow() now is geom_vector() with better documentation and more
  parameters and geom_arrow() is a new geom for arrows that preserve direction.
• ReadNetCDF() now handles more date formats.
• New functions Laplacian(), Divercence() and Vorticity()
• DerivatePhysical() is removed since it was made redundant by the extended
  functionality in Derivate()
• New functions related to several physical processes (see ?physics).
• New geom_text_contour() and geom_label_contour() for labeling contours.
• New function GeostrophicWind().
• Fixed? werid bug with ReadNetCDF() and as.POSIXct.
• ReadNetCDF() now supports timezones via de udunits2 package.
• Fixed bad polygon ordering and extra polygon in stat_contour_fill().
• New functions MakeBreaks() and AnchorBreaks().
• New guide. guide_colorstrip() displays discretized values of a continuous color
  or fill scale.
• Fix for unconnected contours in stat_contour_fill()
• New geom_relief() for generating relief shading.
• ReadNetCDF() gains a subset argument for subseting data.
• AnchorBreaks() is a new way of generating breaks.
• New geom_contour2() that takes a function as argument in breaks and
  geom_contour_fill() also does the same.
• New stat_subset() that makes subsetting data on the fly easier.
• ReadNetCDF() can return a keyed data.table.
• FitQsWave() and BuildQsWave() renamed to FitWave() and BuildWave(),
  respectively.
• GetSMNData() is updated to include the new SMN website and data types.
• geom_contour2() and geom_contour_fill() gain a circular argument to specify
  a circular dimension.
• RepeatCircular() renamed to RepeatCircular().
• LonLabel() and LatLabel() aid labeling latitude and longitude.
• Changed interface of EOF() and ImputeEOF().