MATLAB: How to use additional files like e.g. gshhs_h.b, WORLDDATAMAP, etc.

gshhshigh-resolution coastlineworlddatamap

I need to plot high-resolution coastline in my maps. So I downloaded gshhs_h.b, compressed it, and put into C:\Program Files\MATLAB\R2012b\toolbox\map\mapdata

Then I tried a command 'filename = unzip('gshhs_h.zip', tempdir);' but I got a reply 'Function UNZIP was unable to find file ''gshhs_h.zip''.'

The same with WORLDDATAMAP. Matlab cannot find it. Do I have to do something special?

Thanks!

Best Answer

You should first check that the mapdata folder is on your MATLAB path.

You could then try: which gshhs_h.zip

You may need to run: rehash toolbox

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MATLAB: How can we find the non common strings from multiple columns

First lets find the strings that are common to all cell arrays:

listA={'India','Iran','Ireland','Israel','Jordan','Kuwait','Lebanon','Lesotho','Libya','Luxembourg','Malawi','Maldives','Morocco','Nepal','Netherlands','Norway','Oman','Paraguay','Peru','Philippines',};
listB={'Denmark','El Salvador','Gabon','Gambia','Lebanon','Lesotho','Libya','Luxembourg','Malawi','Maldives','Morocco','Nepal','Netherlands','Norway','Oman','Paraguay','Peru','Philippines','Qatar','Rwanda','Saudi Arabia','Senegal','Singapore','Sudan'};
listC={'Kuwait','Lebanon','Lesotho','Nepal','Netherlands','Oman','Sweden','Syria','Tanzania','Turkey','Uruguay'};
%

lists = {listA,listB,listC}; % storing data together makes working with them much simpler.
%
exc = lists{1};
for k = 2:numel(lists)
    exc = intersect(exc,lists{k});
end

giving the strings found in all cell arrays as:

 exc =
    'Lebanon'
    'Lesotho'
    'Nepal'
    'Netherlands'
    'Oman'

Now we can easily get the input cell arrays with the strings from exc removed:

out = cell(size(lists));
for k = 1:numel(lists)
    out{k} = setdiff(lists{k},exc);
end

giving:

>> out{:}
ans = 
    'India' 'Iran' 'Ireland' 'Israel' 'Jordan' 'Kuwait' 'Libya' 'Luxembourg' 'Malawi' 'Maldives' 'Morocco' 'Norway' 'Paraguay' 'Peru' 'Philippines'
ans =
    'Denmark' 'El Salvador' 'Gabon' 'Gambia' 'Libya' 'Luxembourg' 'Malawi' 'Maldives' 'Morocco' 'Norway' 'Paraguay' 'Peru' 'Philippines' 'Qatar' 'Rwanda' 'Saudi Arabia' 'Senegal' 'Singapore' 'Sudan'
ans =
    'Kuwait' 'Sweden' 'Syria' 'Tanzania' 'Turkey' 'Uruguay'

And if you want a list of all strings together, excluding those in exc:

uni = {};
for k = 1:numel(lists)
    uni = union(uni,lists{k});
end
uni = setdiff(uni,exc)

gives:

uni =
    'Denmark' 'El Salvador' 'Gabon' 'Gambia' 'India' 'Iran' 'Ireland' 'Israel' 'Jordan' 'Kuwait' 'Libya' 'Luxembourg' 'Malawi' 'Maldives' 'Morocco' 'Norway' 'Paraguay' 'Peru' 'Philippines' 'Qatar' 'Rwanda' 'Saudi Arabia' 'Senegal' 'Singapore' 'Sudan' 'Sweden' 'Syria' 'Tanzania' 'Turkey' 'Uruguay'

MATLAB: Error Reading a DEM file using “gtopo30” function of the Mapping Toolbox

Start by downloading the "W140N40" tile from here:

https://dds.cr.usgs.gov/srtm/version2_1/SRTM30/w140n40/

Note: Make sure to download "w140n40.hdr.zip" and "w140n40.dmw.zip" and place the extracted HDR and DEM in your MATLAB current folder.

Execute the below commands to get the map of the region:

[Z,refvec] = gtopo30('W140N40',1,[34 36],[-120 -118]);
figure
usamap(Z,refvec);
geoshow(Z,refvec,'DisplayType','surface');
demcmap(Z);

Best Answer

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MATLAB: How can we find the non common strings from multiple columns

MATLAB: Error Reading a DEM file using “gtopo30” function of the Mapping Toolbox

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