contour

Display contour map of RF propagation data in Site Viewer

Since R2020a

Syntax

contour(pd)

contour(___,Name,Value)

Description

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

contour(___,Name,Value) creates a filled contour map with additional options specified by name-value pair 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 (default)

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.

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

Example: 'Type','power'

DataVariableName — Data variable to contour map

DataVariableName (default) | character vector | string scalar

Data variable to contour map, specified as the comma-separated pair consisting of 'DataVariableName' and a character vector or a string scalar corresponding to a variable name in the data table used to create the propagation data container object pd.

Data Types: char | string

Type — Type of value to plot

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

Type of value to plot, specified as the comma-separated pair consisting of 'Type' and one of the values in the 'Type' column:

Type	ColorLimits	LegendTitle
'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)'

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

Data Types: char | string

Levels — Data value levels to plot

numeric vector

Data value levels to plot, specified as the comma-separated pair consisting of 'Levels' and numeric vector. Each level is displayed as a different colored, filled contour on the map. The colors are selected using Colors if specified, or else Colormap and ColorLimits. Data points with values below the minimum level are not included in the plot.

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

Data Types: double

Colors — Colors of data points

M-by-3 array of RGB | array of strings | cell array of character vectors

Colors of the filled contours, specified as the comma-separated pair consisting of 'Colors' and an M-by-3 array of RGB (red, blue, green) or an array of strings, or a cell array of character vectors. Colors are assigned element-wise to values in Levels for coloring the corresponding points. Colors cannot be used with Colormap and ColorLimits.

Data Types: double | char | string

Colormap — Color map for coloring points

'jet(256)' (default) | predefined colormap name | M-by-3 array of RGB triplets

Colormap for the coloring points, specified as the comma-separated pair consisting of 'Colormap' and a predefined colormap name or an M-by-3 array of RGB (red, blue, green) triplets that define M individual colors. Colormap cannot be used with Colors.

Data Types: double | char | string

ColorLimits — Color limits for color map

two-element vector

Color limits for the colormap, specified as the comma-separated pair consisting of 'ColorLimits' and 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. ColorLimits cannot be used with Colors.

Data Types: double

Transparency — Transparency of contour map

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

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

Data Types: double

ShowLegend — Show color legend on map

true (default) | false

Show color legend on map, specified as the comma-separated pair consisting of 'ShowLegend' and true or false.

Data Types: logical

LegendTitle — Title of color legend

character vector | string scalar

Title of color legend, specified as the comma-separated pair consisting of 'LegendTitle' and a character vector or a string scalar.

Data Types: string | char

Map — Map for surface data

siteviewer object

Map for surface data, specified as the comma-separated pair consisting of 'Map' and 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