How to remove the horizontal line from my NMEA plot ?

% Opens the file gpsLog.txt with read access.

fileID = fopen('gpsLog.txt','r');

% Read the text file.

gpsData = fscanf(fileID,'%c');

parserObj = nmeaParser('MessageId','GGA');

% Parse the NMEA Data.

ggaData = parserObj(gpsData);

% Initialize variables.

latVector = zeros(1,numel(ggaData));

lonVector = zeros(1,numel(ggaData));

for i=1:length(ggaData)

% Check if the parsed GGA sentences are valid and if they are valid, get the

% latitude and longitude from the output structures. Status = 0,

% indicates the data is valid

if ggaData(i).Status == 0

latVector(i) = ggaData(i).Latitude;

lonVector(i) = ggaData(i).Longitude;

end

end

% Remove Nan value in latitude and longitude data, if any. nmeaParser object

% returns NaN for a value if the value is not available in the sentence.

% For example, latitude and longitude data are not available if there is no

% satellite fix.

latVector = latVector(~isnan(latVector));

lonVector = lonVector(~isnan(lonVector));

% Plot the position in geographic coordinates

geoplot(latVector,lonVector,'Marker',"*",'MarkerSize',3, ...

"Color",'blue','MarkerFaceColor','red');

% Selects the basemap

geobasemap 'topographic';

this is the code from matlab website on how to plot NMEA log file

Answer 1

[Star Strider]

With no file or other information, the problem may be that there is a common value (possibly 0) that separates segments of the file. Find out what that constant is, set it to NaN, and then use fillmissing or rmmissing to resolve the problem.

[Yosuanto]

Hi! thanks for the answer

After checking the parsed GGA data I noticed that there are some segments of the file are set to NaN value

After deleting the row with NaN value

it become normal

[Star Strider]

My pleasure!

If my Answer helped you solve your problem, please Accept it!

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