pygmt.Figure.plot

Figure.plot(data=None, x=None, y=None, size=None, direction=None, *, straight_line=None, frame=None, cmap=None, offset=None, error_bar=None, connection=None, fill=None, intensity=None, projection=None, close=None, no_clip=None, region=None, style=None, verbose=None, pen=None, zvalue=None, aspatial=None, binary=None, panel=None, nodata=None, find=None, coltypes=None, gap=None, header=None, incols=None, label=None, perspective=None, transparency=None, wrap=None, **kwargs)

Plot lines, polygons, and symbols in 2-D.

Takes a matrix, (x,y) pairs, or a file name as input and plots lines, polygons, or symbols at those locations on a map.

Must provide either data or x/y.

If providing data through x/y, fill can be a 1-D array that will be mapped to a colormap.

If a symbol is selected and no symbol size given, then plot will interpret the third column of the input data as symbol size. Symbols whose size is <= 0 are skipped. If no symbols are specified then the symbol code (see style below) must be present as last column in the input. If style is not used, a line connecting the data points will be drawn instead. To explicitly close polygons, use close. Select a fill with fill. If fill is set, pen will control whether the polygon outline is drawn or not. If a symbol is selected, fill and pen determine the fill and outline/no outline, respectively.

Full option list at https://docs.generic-mapping-tools.org/latest/plot.html

Aliases:

A = straight_line
B = frame
C = cmap
D = offset
E = error_bar
F = connection
G = fill
I = intensity
J = projection
L = close
N = no_clip
R = region
S = style
V = verbose
W = pen
Z = zvalue
a = aspatial
b = binary
c = panel
d = nodata
e = find
f = coltypes
g = gap
h = header
i = incols
l = label
p = perspective
t = transparency
w = wrap

Parameters

data (str or numpy.ndarray or pandas.DataFrame or xarray.Dataset or geopandas.GeoDataFrame) – Pass in either a file name to an ASCII data table, a 2-D numpy.ndarray, a pandas.DataFrame, an xarray.Dataset made up of 1-D xarray.DataArray data variables, or a geopandas.GeoDataFrame containing the tabular data. Use parameter incols to choose which columns are x, y, fill, and size, respectively.
x/y (float or 1-D arrays) – The x and y coordinates, or arrays of x and y coordinates of the data points
size (1-D array) – The size of the data points in units specified using style. Only valid if using x/y.
direction (list of two 1-D arrays) – If plotting vectors (using style="V" or style="v"), then should be a list of two 1-D arrays with the vector directions. These can be angle and length, azimuth and length, or x and y components, depending on the style options chosen.
projection (str) – projcode[projparams/]width. Select map projection.
region (str or list) – xmin/xmax/ymin/ymax[+r][+uunit]. Specify the region of interest.
straight_line (bool or str) – [m|p|x|y]. By default, geographic line segments are drawn as great circle arcs. To draw them as straight lines, use straight_line=True. Alternatively, add m to draw the line by first following a meridian, then a parallel. Or append p to start following a parallel, then a meridian. (This can be practical to draw a line along parallels, for example). For Cartesian data, points are simply connected, unless you append x or y to draw stair-case curves that whose first move is along x or y, respectively.
frame (bool or str or list) – Set map boundary frame and axes attributes.
cmap (str) – File name of a CPT file or a series of comma-separated colors (e.g., color1,color2,color3) to build a linear continuous CPT from those colors automatically.
offset (str) – dx/dy. Offset the plot symbol or line locations by the given amounts dx/dy [Default is no offset]. If dy is not given it is set equal to dx.
error_bar (bool or str) – [x|y|X|Y][+a|A][+cl|f][+n][+wcap][+ppen]. Draw error bars. Full documentation is at https://docs.generic-mapping-tools.org/latest/plot.html#e.
connection (str) –
[c|n|r][a|f|s|r|refpoint]. Alter the way points are connected (by specifying a scheme) and data are grouped (by specifying a method). Append one of three line connection schemes:
- c : Draw continuous line segments for each group [Default].
- r : Draw line segments from a reference point reset for each group.
- n : Draw networks of line segments between all points in each group.
Optionally, append the one of four segmentation methods to define the group:
- a : Ignore all segment headers, i.e., let all points belong to a single group, and set group reference point to the very first point of the first file.
- f : Consider all data in each file to be a single separate group and reset the group reference point to the first point of each group.
- s : Segment headers are honored so each segment is a group; the group reference point is reset to the first point of each incoming segment [Default].
- r : Same as s, but the group reference point is reset after each record to the previous point (this method is only available with the connection="r" scheme).
Instead of the codes a|f|s|r you may append the coordinates of a refpoint which will serve as a fixed external reference point for all groups.
fill (str) – Set color or pattern for filling symbols or polygons [Default is no fill]. fill can be a 1-D array, but it is only valid if using x/y and cmap=True is also required.
intensity (float or bool or 1-D array) – Provide an intensity value (nominally in the -1 to +1 range) to modulate the fill color by simulating illumination. If using intensity=True, we will instead read intensity from the first data column after the symbol parameters (if given). intensity can also be a 1-D array to set varying intensity for symbols, but it is only valid for x/y pairs.
close (str) – [+b|d|D][+xl|r|x0][+yl|r|y0][+ppen]. Force closed polygons. Full documentation is at https://docs.generic-mapping-tools.org/latest/plot.html#l.
no_clip (bool or str) – [c|r]. Do not clip symbols that fall outside the frame boundaries [Default plots points whose coordinates are strictly inside the frame boundaries only]. The parameter does not apply to lines and polygons which are always clipped to the map region. For periodic (360-longitude) maps we must plot all symbols twice in case they are clipped by the repeating boundary. no_clip=True will turn off clipping and not plot repeating symbols. Use no_clip="r" to turn off clipping but retain the plotting of such repeating symbols, or use no_clip="c" to retain clipping but turn off plotting of repeating symbols.
style (str) – Plot symbols (including vectors, pie slices, fronts, decorated or quoted lines).
pen (str) – Set pen attributes for lines or the outline of symbols.
verbose (bool or str) –
Select verbosity level [Default is w], which modulates the messages written to stderr. Choose among 7 levels of verbosity:
- q - Quiet, not even fatal error messages are produced
- e - Error messages only
- w - Warnings [Default]
- t - Timings (report runtimes for time-intensive algorithms)
- i - Informational messages (same as verbose=True)
- c - Compatibility warnings
- d - Debugging messages
zvalue (str) – value|file. Instead of specifying a symbol or polygon fill and outline color via fill and pen, give both a value via zvalue and a color lookup table via cmap. Alternatively, give the name of a file with one z-value (read from the last column) for each polygon in the input data. To apply it to the fill color, use fill="+z". To apply it to the pen color, append +z to pen.
aspatial (bool or str) – [col=]name[,…]. Control how aspatial data are handled during input and output. Full documentation is at https://docs.generic-mapping-tools.org/latest/gmt.html#aspatial-full.
binary (bool or str) –
i|o[ncols][type][w][+l|b]. Select native binary input (using binary="i") or output (using binary="o"), where ncols is the number of data columns of type, which must be one of:
- c - int8_t (1-byte signed char)
- u - uint8_t (1-byte unsigned char)
- h - int16_t (2-byte signed int)
- H - uint16_t (2-byte unsigned int)
- i - int32_t (4-byte signed int)
- I - uint32_t (4-byte unsigned int)
- l - int64_t (8-byte signed int)
- L - uint64_t (8-byte unsigned int)
- f - 4-byte single-precision float
- d - 8-byte double-precision float
- x - use to skip ncols anywhere in the record
For records with mixed types, append additional comma-separated combinations of ncols type (no space). The following modifiers are supported:
- w after any item to force byte-swapping.
- +l|b to indicate that the entire data file should be read as little- or big-endian, respectively.
Full documentation is at https://docs.generic-mapping-tools.org/latest/gmt.html#bi-full.
panel (bool or int or list) – [row,col|index]. Select a specific subplot panel. Only allowed when in subplot mode. Use panel=True to advance to the next panel in the selected order. Instead of row,col you may also give a scalar value index which depends on the order you set via autolabel when the subplot was defined. Note: row, col, and index all start at 0.
nodata (str) – i|onodata. Substitute specific values with NaN (for tabular data). For example, nodata="-9999" will replace all values equal to -9999 with NaN during input and all NaN values with -9999 during output. Prepend i to the nodata value for input columns only. Prepend o to the nodata value for output columns only.
find (str) – [~]“pattern” | [~]/regexp/[i]. Only pass records that match the given pattern or regular expressions [Default processes all records]. Prepend ~ to the pattern or regexp to instead only pass data expressions that do not match the pattern. Append i for case insensitive matching. This does not apply to headers or segment headers.
coltypes (str) – [i|o]colinfo. Specify data types of input and/or output columns (time or geographical data). Full documentation is at https://docs.generic-mapping-tools.org/latest/gmt.html#f-full.
gap (str or list) –
x|y|z|d|X|Y|Dgap[u][+a][+ccol][+n|p]. Examine the spacing between consecutive data points in order to impose breaks in the line. To specify multiple criteria, provide a list with each item containing a string describing one set of criteria.
- x|X - define a gap when there is a large enough change in the x coordinates (upper case to use projected coordinates).
- y|Y - define a gap when there is a large enough change in the y coordinates (upper case to use projected coordinates).
- d|D - define a gap when there is a large enough distance between coordinates (upper case to use projected coordinates).
- z - define a gap when there is a large enough change in the z data. Use +ccol to change the z data column [Default col is 2 (i.e., 3rd column)].
A unit u may be appended to the specified gap:
- For geographic data (x|y|d), the unit may be arc- d(egrees), m(inutes), and s(econds) , or (m)e(ters), f(eet), k(ilometers), M(iles), or n(autical miles) [Default is (m)e(ters)].
- For projected data (X|Y|D), the unit may be i(nches), c(entimeters), or p(oints).
Append modifier +a to specify that all the criteria must be met [default imposes breaks if any one criterion is met].

One of the following modifiers can be appended:
- +n - specify that the previous value minus the current column value must exceed gap for a break to be imposed.
- +p - specify that the current value minus the previous value must exceed gap for a break to be imposed.
header (str) –
[i|o][n][+c][+d][+msegheader][+rremark][+ttitle]. Specify that input and/or output file(s) have n header records [Default is 0]. Prepend i if only the primary input should have header records. Prepend o to control the writing of header records, with the following modifiers supported:
- +d to remove existing header records.
- +c to add a header comment with column names to the output [Default is no column names].
- +m to add a segment header segheader to the output after the header block [Default is no segment header].
- +r to add a remark comment to the output [Default is no comment]. The remark string may contain \n to indicate line-breaks.
- +t to add a title comment to the output [Default is no title]. The title string may contain \n to indicate line-breaks.
Blank lines and lines starting with # are always skipped.
incols (str or 1-D array) –
Specify data columns for primary input in arbitrary order. Columns can be repeated and columns not listed will be skipped [Default reads all columns in order, starting with the first (i.e., column 0)].
- For 1-D array: specify individual columns in input order (e.g., incols=[1,0] for the 2nd column followed by the 1st column).
- For str: specify individual columns or column ranges in the format start[:inc]:stop, where inc defaults to 1 if not specified, with columns and/or column ranges separated by commas (e.g., incols="0:2,4+l" to input the first three columns followed by the log-transformed 5th column). To read from a given column until the end of the record, leave off stop when specifying the column range. To read trailing text, add the column t. Append the word number to t to ingest only a single word from the trailing text. Instead of specifying columns, use incols="n" to simply read numerical input and skip trailing text. Optionally, append one of the following modifiers to any column or column range to transform the input columns:
  - +l to take the log10 of the input values.
  - +d to divide the input values by the factor divisor [Default is 1].
  - +s to multiple the input values by the factor scale [Default is 1].
  - +o to add the given offset to the input values [Default is 0].
label (str) – Add a legend entry for the symbol or line being plotted. Full documentation is at https://docs.generic-mapping-tools.org/latest/gmt.html#l-full.
perspective (list or str) – [x|y|z]azim[/elev[/zlevel]][+wlon0/lat0[/z0]][+vx0/y0]. Select perspective view and set the azimuth and elevation angle of the viewpoint [Default is [180, 90]]. Full documentation is at https://docs.generic-mapping-tools.org/latest/gmt.html#perspective-full.
transparency (int or float) – Set transparency level, in [0-100] percent range [Default is 0, i.e., opaque]. Only visible when PDF or raster format output is selected. Only the PNG format selection adds a transparency layer in the image (for further processing). transparency can also be a 1-D array to set varying transparency for symbols, but this option is only valid if using x/y.
wrap (str) –
y|a|w|d|h|m|s|cperiod[/phase][+ccol]. Convert the input x-coordinate to a cyclical coordinate, or a different column if selected via +ccol. The following cyclical coordinate transformations are supported:
- y - yearly cycle (normalized)
- a - annual cycle (monthly)
- w - weekly cycle (day)
- d - daily cycle (hour)
- h - hourly cycle (minute)
- m - minute cycle (second)
- s - second cycle (second)
- c - custom cycle (normalized)
Full documentation is at https://docs.generic-mapping-tools.org/latest/gmt.html#w-full.