contour

Display contour map of RF propagation data in Site Viewer

Syntax

contour(pd)

contour(___,Name=Value)

Description

contour(pd) creates a filled contour plot from the specified propagation data object in the current Site Viewer. Contours are colored according to data values of corresponding locations.

contour(___,Name=Value) specifies options using name-value arguments.

Examples

Capacity Map Using SINR Data

Define names and locations of sites around Boston.

names = ["Fenway Park","Faneuil Hall","Bunker Hill Monument"];
lats = [42.3467,42.3598,42.3763];
lons = [-71.0972,-71.0545,-71.0611];

Create an array of transmitter sites.

txs = txsite("Name",names,...
       "Latitude",lats,...
       "Longitude",lons, ...
       "TransmitterFrequency",2.5e9);
show(txs)

Create a signal-to-interference-plus-noise-ratio (SINR) map, where signal source for each location is selected as the transmitter site with the strongest signal.

sv1 = siteviewer("Name","SINR map");
sinr(txs,"MaxRange",5000)

Return SINR propagation data.

pd = sinr(txs,"MaxRange",5000);
[sinrDb,lats,lons] = getDataVariable(pd,"SINR"); 

Compute capacity using the Shannon-Hartley theorem.

bw = 1e6; % Bandwidth is 1 MHz
sinrRatio = 10.^(sinrDb./10); % Convert from dB to power ratio
capacity = bw*log2(1+sinrRatio)/1e6; % Unit: Mbps

Create new propagation data for the capacity map and display the contour plot.

pdCapacity = propagationData(lats,lons,"Capacity",capacity);
sv2 = siteviewer("Name","Capacity map");
legendTitle = "Capacity" + newline + "(Mbps)";
contour(pdCapacity,"LegendTitle",legendTitle);

Input Arguments

pd — Propagation data

propagationData object

Propagation data, specified as a propagationData object.

Name-Value Arguments

Specify optional pairs of arguments as Name1=Value1,...,NameN=ValueN, where Name is the argument name and Value is the corresponding value. Name-value arguments must appear after other arguments, but the order of the pairs does not matter.

Example: contour(pd,Transparency=0.8) specifies the transparency of the contour plot.

Before R2021a, use commas to separate each name and value, and enclose Name in quotes.

Example: contour(pd,"Transparency",0.8) specifies the transparency of the contour plot.

DataVariableName — Data variable to contour

DataVariableName (default) | character vector | string scalar

Data variable to contour, specified as a character vector or a string scalar. The data variable must correspond to a variable name of the table used to create the propagationData object.

Data Types: char | string

Type — Type of value to plot

"custom" (default) | "power" | "efield" | "sinr" | "pathloss"

Type of value to plot, specified as "custom", "power", "efield", "sinr", or "pathloss". This table shows the default color limits and legend title for each type.

Type	Color limits	Legend title
"custom"	[min(Data) max(Data)]	''
"power"	[-120 -5]	Power (dBm)
"efield"	[20 135]	E-field (dBuV/m)
"sinr"	[-5 20]	SINR (dB)
"pathloss"	[45 160]	Path loss (dB)

Data Types: char | string

Levels — Data value levels to plot

numeric vector

Data value levels to plot, specified as a numeric vector. Site Viewer displays each level as a filled contour on the map. The function selects the colors for the contours by using the Colors argument, if specified, or else the Colormap and ColorLimits arguments. The function does not display data points with values below the minimum level.

The default value for Levels is a linearly spaced vector bounded by the value of the ColorLimits argument.

Data Types: double

Colors — Colors of filled contours

M-by-3 array of RGB | array of string scalars | cell array of character vectors

Colors of the filled contours, specified as an M-by-3 array of RGB triplets, an array of string scalars, or a cell array of character vectors. The function assigns the colors to the corresponding values specified by the Levels argument.

The Colors argument cannot be combined with the Colormap or ColorLimits arguments.

Data Types: double | char | string

Colormap — Colormap for coloring points

jet (default) | predefined colormap name | M-by-3 array of RGB triplets

Colormap for coloring the points, specified as a predefined colormap name or an M-by-3 array of RGB triplets that define M colors.

The Colormap argument cannot be used with the Colors argument.

Data Types: double | char | string

ColorLimits — Color limits for color map

two-element vector

Color limits for the colormap, specified as a two-element vector of the form [min max]. The color limits indicate the data level values that map to the first and last colors in the colormap.

The ColorLimits argument cannot be used with the Colors argument.

Data Types: double

Transparency — Transparency of contour plot

0.4 (default) | numeric scalar in range [0, 1]

Transparency of the contour plot, specified as a numeric scalar in the range [0, 1]. 0 is completely transparent and 1 is completely opaque.

Data Types: double

ShowLegend — Show color legend on map

true (default) | false

Show the color legend on the map, specified as true or false.

Data Types: logical

LegendTitle — Title of color legend

character vector | string scalar

Title of the color legend, specified as a character vector or a string scalar.

Data Types: string | char

Map — Map for surface data

siteviewer object

Map for the surface data, specified as a siteviewer object.¹ The default value is the current Site Viewer or a new Site Viewer, if none is open.

Data Types: char | string

Version History

Introduced in R2020a