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## 1.1.13 Overview of GMT 4.1.3 [June-1, 2006]

Changes in GMT 4.1.3 are relatively minor and predominantly bug fixes. However, a few enhancements have been made to overcome limitations in the previous versions:

1. Added the Hughes 1980 ellipsoid for projection support for DMSP SSM/I grid products.
2. grdfft has an extended -F option to allow for either Gaussian- or cosine-tapered filtering.
3. psscale now has a -Q option so that logarithmic color scales and annotations can be handled properly.
4. makecpt and grd2cpt have a new -M option to allow the background, foreground, and NaN-colors to be assigned using the GMT defaults instead of the settings in the master CPT file.
5. mgd77list in the mgd77 supplement has new option -Q to specify limits on speed and azimuths for output records.

Below is a list of previous problems (some accidentily introduced in GMT 4.1.2) that we have identified and corrected in the current release:

gmt_grdio.c
  : Bug in `GMT_grd_shift` for gridline-registered grids; this function is used in grdedit to rotate grids of 360-degree longitudinal extent. Also added better testing for subsets of global (0-360) grids.
gmt_init.c
  : `GMT_PS_init` was called after -PAR=val had been decoded, resetting the PostScript-related parameters to their default settings.
gmt_support.c
  : `GMT_set_xy_domain` padded region for pixel instead of gridline node registration, which could cause SEGV in xyz2grd if (x,y) was less than half the grid-spacing outside region.
blockmean
  : The -C option got reversed in 4.1.2 - now fixed.
blockmedian
  : The -C option got reversed in 4.1.2 - now fixed.
grdcontour
  : The -C option with a non-cpt file failed to read due to lack of proper if-test.
grdedit
  : The -S option was backwards and tested w-e=360; should be e-w=360.
grdimage
  : Fixed bug introduced by `GMT_get_inc` in 4.1.2. Internal projected grid never took node_offset from input grid.
grdmask
  : Polygons with zig-zag shape would sometimes cause a node exactly on a polygon vertex to be considered inside. Radius was reset to 0 after -S radius was assigned.
grdvector
  : The -A option was not properly initiated.
psbasemap
  : The -L option did not properly parse the optional :label:<just> part.
pslegend
  : If the M (for map scale) was used, the -R and -J options would be reset. Also prevented the undoing of -X and -Y at the end of the program.

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