Figure.grdcontour(grid, **kwargs)

Convert grids or images to contours and plot them on maps

Takes a grid file name or an xarray.DataArray object as input.

Full option list at


  • A = annotation

  • B = frame

  • C = interval

  • G = label_placement

  • J = projection

  • L = limit

  • Q = cut

  • R = region

  • S = resample

  • U = timestamp

  • W = pen

  • l = label

  • grid (str or xarray.DataArray) – The file name of the input grid or the grid loaded as a DataArray.

  • interval (str or int) –

    Specify the contour lines to generate.

    • The filename of a CPT file where the color boundaries will be used as contour levels.

    • The filename of a 2 (or 3) column file containing the contour levels (col 1), (C)ontour or (A)nnotate (col 2), and optional angle (col 3)

    • A fixed contour interval cont_int or a single contour with +[cont_int]

  • annotation (str, int, or list) –

    Specify or disable annotated contour levels, modifies annotated contours specified in -C.

    • Specify a fixed annotation interval annot_int or a single annotation level +[annot_int]

    • Disable all annotation with '-'

    • Optional label modifiers can be specified as a single string '[annot_int]+e' or with a list of options ([annot_int], 'e', 'f10p', 'gred').

  • limit (str or list of 2 ints) – Do no draw contours below low or above high, specify as string '[low]/[high]' or list [low,high].

  • cut (str or int) – Do not draw contours with less than cut number of points.

  • resample (str or int) – Resample smoothing factor.

  • projection (str) – Required if this is the first plot command. Select map projection.

  • region (str or list) – Required if this is the first plot command. 'xmin/xmax/ymin/ymax[+r][+uunit]'. Specify the region of interest.

  • frame (str or list) – Set map boundary frame and axes attributes.

  • color (str) – Select color or pattern for filling of symbols or polygons. Default is no fill.

  • timestamp (bool or str) – Draw GMT time stamp logo on plot.

  • pen (str) – Set pen attributes for lines or the outline of symbols.

  • label (str) – Add a legend entry for the contour being plotted. Normally, the annotated contour is selected for the legend. You can select the regular contour instead, or both of them, by considering the label to be of the format [annotcontlabel][/contlabel]. If either label contains a slash (/) character then use | as the separator for the two labels instead.