MATLAB: Using indexing to find specific rows

indexingspecific row

I have a .CSV file that has the latitude, longitude, and elevation in three columns. I would like to bring that into my code, so if a certain longitude is typed in, then the latitude and elevation associated would be the out put. I am having problems with the import feature, and the numbers keep rounding up which is not good for what I am doing. Any help is greatly appreciated.

Best Answer

There are a number of ways to read your file.

With respect to the rounding, that is only in the display. MATLAB maintains full internal precision.

With that in mind, however, the ismembertol funciton could be useful in retrieving the desired coordinates.

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You're trying to extract the data from the image file?

imread will work find for this purpose. It will return an mxnx3 variable where each page represents the red, green, and blue values for each pixel respectively.

Or do you already have the data in MATLAB and you only want to take a small chunk of it? In that case, it would help to know the shape of the data. But I'll assume for the moment that you've got two vectors, LAT, and LON that represent the ranges of latitude and longitude and a 2D variable BATH. Let's assume LAT is a column vector, and LON is a row vector. BATH should be [length(LAT) length(LON)] in size.

LAT_index = LAT >= 55 & LAT <= 60;
LON_index = LON >= -8 & LON <= -4;
LAT_subset = LAT(LAT_index);
LON_subset = LON(LON_index);
BATH_subset = BATH(LAT_index,LON_index);

MATLAB: How to get latitude, longitude and elevation from pgx file

P = gpxread('Track_2018-05-16 181018.gpx') ;
lon = p.Longitude ;
lat = p.Latitude ;
ele = p.Elevation ;
time = p.Time ;

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