For example, we can change its visual properties like linestyle, line or filled contour, individual colors to color maps and increase the level in the contour plot, etc. We can customize the contour plots in matplotlib. If the sequence is shorter than the number of levels, it's repeated. The sequence is cycled for the levels in ascending order. It changes the linestyle of the contour linesĬolor string or sequence of colors. If not given, the default linear scaling is used. Optional parameter.If a colormap is used, the Normalize instance scales the level values to the canonical colormap range for mapping to colors. The colormap maps the level values to color. It controls the transparency of the contour plot.ĭatatype: string, the default value 'viridis'. Determines the number and position of the contour lines and regions.ĭatatype: float, default value is 1. The height values over which the contour is drawn.ĭatatype: int or array, optional parameter. X and Y must be 2D with the same shape as Z (created via shgrid()ĭatatype: array. How to Use Contour Plot in Matplotlib Syntaxĭatatype: array, optional parameter. We can see that the contour lines represent the elevation in the plot. Here is the plot of the function Z= x^2 + y^2 in 3D. We can see that color lines represent the elevation (3rd dimension). Here is the plot of the function Z= x^2 + y^2 on the plane. In 3D contour plot can be easily visualized because of the third dimension (Z) 2D To visualize the contour plot in the 2D plane, the third dimension or height is converted to contours of colors and lines. In matplotlib, we can visualize the contour plots in 2D and 3D. Contour plots can also be used to study the terrain's geography, which helps show the elevations. The contour lines are joined at equal elevation, which helps us visualize elevation on the ground. Isolines (contour lines) represent a region's shape on a two-dimensional map. Need for Contour PlotsĬontour plots are widely used in cartography, where contour lines on a topological map indicate the same elevations. Isolines are curves where a function of two variables has the same value or lines that connect points of equal elevation. In addition, a contour plot displays the matrix's isoline. For example, contours in matplotlib are represented by a contour plot which consists of an X-Y plane and matrix Z as height to the plane. IntroductionĪ contour plot is a graphical technique for representing a 3-D surface by plotting constant slices, called contour, in a 2-D format. There are various arguments in the function to change the visual appearance of the contour plot in matplotlib, like levels, colors, line width, blending value, etc. For 2D contour plot in matplotlib we can use () and () (filled contour) and function for 3D contour plot is 3D(). To accomplish this I do plot the relfectivity with an alpha kwarg, e.g.Matplotlib provides the module and functions to create a contour plot. Ideally I want the reflectivity data to be a subtle background and the circulation plot to be the focus. Doing this for both contours though presents presentation problems. This can be accomplished by setting the alpha kwarg in the call to contourf. The key to plotting two filled plots is use alpha blending. So how do we combine both filled contour plots into one image? Alpha blending This, however, makes interpreting the data more work. One solution to plotting both sets of data together it to switch one to unfilled contour. I also have reflectivity (simulated) data, which is similarly straightforward to plot: This presentation lacks context for the circulation, which the circulation is located in reference to storm structure. The data I want to display is circulation, a measure of macroscopic rotation given by: $$\Gamma = \oint \mathbfl$$ This is straightforward to plot: First, to motivate the need for two filled contours, here are examples of the data that I was looking at.
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