The thickness of the grid lines. Default is 1.LABEL: Set this keyword to label the parallels and meridians with their
corresponding latitudes and longitudes. Setting this keyword to
an integer will cause every LABEL gridline to be labeled (i.e,
if LABEL=3 then every third gridline will be labeled). The
starting point for determining which gridlines are labeled is the
minimum latitude or longitude (-180 to 180), unless the LATS or
LONS keyword is set to a single value. In this case, the starting
point is the value of LATS or LONS.
ALIGN: This keyword controls the alignment of the text baseline for
latitude labels. A value of 0.0 left justifies the label,
1.0 right justifies it, and 0.5 centers it.
ATDEL: The spacing in degrees between parallels of latitude in the grid.
If not set, a suitable value is determined from the current map
projection.
LATS: The desired latitudes to be drawn (and optionally labeled). If
this keyword is omitted, appropriate latitudes will be generated
with consideration of the optional LATDEL keyword. If this
keyword is set to a single value, drawn (and optionally labeled)
latitudes will be automatically generated as
[...,LATS-LATDEL,LATS,LATS+LATDEL,...] over the extent of the
map. The single valued LATS is taken to be the starting point
for labelling (See the LABEL keyword).
ATLAB: The longitude at which to place latitude labels. The default is
the center longitude on the map.
NAMES: An array specifing the names to be used for the latitude labels.
By default, this array is automatically generated in units of
degrees. This array can be a string array or numeric, but should
not be of mixed type. When LATNAMES is specified, LATS must also
be specified, but the number of elments in the two arrays need not
be equal. Extra LATNAMES are ignored, while LATNAMES not supplied
are automatically reported in degrees. LATNAMES can be used when
LATS is set to a single value. It this case, the LATS used will
start at the specified latitude and progress northward, wrapping
around the globe if appropriate. Caution should be used when
using LATNAMES in conjunction with a single LATS, since the
number of visible latitude gridlines is dependent on many factors.
ALIGN: This keyword controls the alignment of the text baseline for
longitude labels. A value of 0.0 left justifies the label,
1.0 right justifies it, and 0.5 centers it.
ONDEL: The spacing in degrees between meridians of longitude in the grid.
If not set, a suitable value is determined from the current map
projection.
ONLAB: The latitude at which to place longitude labels. The default is
the center latitude on the map.
LONS: The desired longitudes to be drawn (and optionally labeled). If
this keyword is omitted, appropriate longitudes will be generated
with consideration of the optional LONDEL keyword. If this
keyword is set to a single value, drawn (and optionally labeled)
longitudes will be automatically generated as
[...,LONS-LONDEL,LONS,LONS+LONDEL,...] over the extent of the map.
The single valued LONS is taken to be the starting point for
labeling (See the LABEL keyword).
NAMES: An array specifing the names to be used for the longitude labels.
By default, this array is automatically generated in units of
degrees. This array can be a string array or numeric, but should
not be of mixed type. When LONNAMES is specified, LATS must also
be specified, but the number of elments in the two arrays need not
be equal. Extra LONNAMES are ignored, while LATNAMES not supplied
are automatically reported in degrees. LONNAMES can be used when
LONS is set to a single value. It this case, the LONS used will
start at the specified longitude and progress eastward, wrapping
around the globe if appropriate. Caution should be used when
using LONNAMES in conjunction with a single LONS, since the number
of visible longitude gridlines is dependent on many factors.