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## 1.1.8 Overview of GMT 4.1.1 [Mar-1, 2006]

Changes in GMT 4.1.1 are mostly minor; a brief listing include

1. gmt_nc.c: Introduced handling of 4-D COARDS compliant grids (See Chapter 4 for details).
2. mgd77/mngd77sniffer: New tool for along-track quality control checking of MGD77 files.
3. spotter/grdrotater: New tool that rotates grids given a specified finite rotation.
4. Jonathan Shewchuk's triangulation routines are now stored with the rest of the source in the GMT_progs.tarzip archives. (However, because his copyright is not GPL, installing it is still an option).

A few programs or options have received minor updates and new features, such as

grdedit
  : Added option -T to toggle between gridline and pixel node registrations (header only).
grdgradient
  : Implemented variation on Lambertian illumination.
grdmask
  : Now takes -S radius[cmkK] as is done in nearneighbor.
gmtmath
  : If file is STDIN we read data from stdin and put the contents on the stack. Also added -F to select which columns to use for output [all].
grdtrack
  : Can now sample Sandwell/Smith IMG grids directly.
psmask
  : -Now takes -S radius[cmkK] as is done in nearneighbor. Can now plot tiles regardless of projection and use patterns.
pstext
  : -D[...]v pen can now be used with or without -M.
psxyz
  : -S OU imitate -S ou but without the 3-D color shading.
mgd77.c
  : Added mechanism to search directories for files (mgd77 supplement).
mgd77list
  : Activated -X option and associated machinery for applying data corrections (mgd77 supplement).

Inevitably, when new features are added, new bugs come along with them. Below is a list of problems that we have identified and corrected in the current release:.

configure.in
  : Extracting VERSION from gmt_version.h, not gmt.h.
gmt_init.c
  : BASEMAP_FRAME_RGB overrode any changes to grid pens etc. Now only does so if prefixed by '+'.
gmt_calclock.c
  : Did not allow -B0 for time-axis.
gmt_map.c
  : -JX...d now plots with WESN or degrees:minutes as per PLOT_DEGREE_FORMAT. Map clip paths for -JE lon/±90 were no good. Under certain circumstances, `GMT_non_zero_winding` might be passed a polygon that was not closed, resulting in an error. -JQ would give garbage if central lon was way outside -R.
gmt_plot.c
  : -JX...d now plots with WESN or degrees:minutes as per PLOT_DEGREE_FORMAT.
gmt_grdio.c
  : Changed logic to avoid false ``scale==0'' warning on Windows. `GMT_open_grd` (used in grdblend) reset scale to NaN. Initialize header information at start of `GMT_read_grd_info`.
gmt_support.c
  : Initialize [xyz]_unit with more appropriate values. Got wrong conversion for dx in meters to degrees.
gmt_grd.h
  : Improved definition of `GMT_x_to_i` macro should reduce bugs
pslib.c
  : `ps_polygon`: if outline == -9 just fill and no clip. Fixed two bugs concerning the /MaskColor operator.
ISO-8859-9.ps
  : Added /dotlessi per Onur Tan.
blockm*
  : Now correctly deals with periodic longitude data.
grdcontour
  : Fixed several issues at grid limits and inappropriate scaling of grid dimensions..
grdfilter
  : Used -1 as index flag instead of INT_MIN.
grdimage
  : Fixed several issues at grid limits and inappropriate scaling of grid dimensions.
grdmask
  : Only let you change the value for outside nodes.
grdmath.man
  : Did not list -f option. Operators LT, LE, EQ, GE, GT returned TRUE if NaNs were involved Now NaN is returned if any of the two operands is a NaN.
grdreformat
  : Update grd.command before writing grid
grdvector
  : Did not place vectors correctly for pixel-pregistered grids.
grdview
  : Skipped nodes outside boundary but they might be needed to draw a tile.
pscoast
  : With -JE and -G r/g/b, the painting of the antipodal bin would incorrectly turn off clipping, messing up the rest of the plot. Now pass -9 to `GMT_fill` which means just fill and no end of clipping.
xyz2grd
  : For geographic grids with 360° range and gridline node registration, the west and east bin did not get replicated properly. Now considers data inside the first and last tiles which might stick outside w/e/s/n.

A few bug-fixes applies to the supplements as well:

x2sys_cross
  : Several problems fixed.

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