Retrieve Elevation Data from Web Map Server is not working

Hello,

when I run the code to get elevation maps (find it on the page https://it.mathworks.com/help/map/retrieving-elevation-data.html):

layers = wmsfind('nasa.network*elev', 'SearchField', 'serverurl');
layers = wmsupdate(layers);

I get the warning:

Warning: An error occurred while attempting to update layers from the server,
'http://www.nasa.network.com/elev?'. These layers are being removed from the layer
array. The number of layers from this server that are being removed from the layer
array is 11. The error message returned by the server is: 'Expected the
capabilities document from the server, 'http://www.nasa.network.com/elev?', to
contain valid XML.'.

And if I try to display the layers:

disp(layers,'Properties',{'LayerTitle','LayerName'})

I get zero layers:

0x1 empty WMSLayer

Can anyone help? This code was working on March 2017 on my computer. I have tried to make it run over several different internet connections, different computers and Matlab versions but it is never working. I have seen somebody already asked about this but nobody responded.

Thank you.

Answer 1

[Prashant Arora]

Hi Olga,

I believe the NASA server has changed recently which is causing this issue. To workaround this, you can try and use the following commands:

info = wmsinfo('https://data.worldwind.arc.nasa.gov/elev?');
layers = info.Layer;
layers = wmsupdate(layers);

[Olga Galluppi]

Hi, Apparently, this is working on Matlab 2017a - but still not working on 2016b. I will just use 2017a.

Thank you very much.

[Arthur Wu]

Hello,

I am experiencing similar error to the original post. When I attempt example from

https://www.mathworks.com/help/map/basic-workflow-for-creating-wms-maps.html

I get an error while updating the layers from the server (step 3). My exact code is

>> elevation = wmsfind('elevation');
>> gtopolayer = refine(elevation, 'Foundation.GTOPO30', 'SearchField', 'layername');
>> gtopolayer = refine(gtopolayer, 'nfis.org', 'SearchField', 'serverurl');
>> gtopolayer = wmsupdate(gtopolayer, 'AllowMultipleServers', true);
Warning: An error occurred while attempting to update layers from the server,
'https://ca.nfis.org/cubewerx/cubeserv/cubeserv.cgi?'. These layers are being
removed from the layer array. The number of layers from this server that are
being removed from the layer array is 1. The error message returned by the
server is: 'sun.security.validator.ValidatorException: PKIX path building
failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to
find valid certification path to requested target'. 
> In wmsupdate>synchronizeLayerArray (line 154)
  In wmsupdate (line 95) 
>> disp(gtopolayer)
  0x0 empty WMSLayer

  Properties:
    ServerTitle
    ServerURL
    LayerTitle
    LayerName
    Latlim
    Lonlim
    Abstract
    CoordRefSysCodes
    Details

  Methods

I've tried Prashant's answer above, and I get

>> info = wmsinfo('https://data.worldwind.arc.nasa.gov/elev?');
layers = info.Layer;
layers = wmsupdate(layers);
Error using wmsinfo>getDocument (line 348)
WebMapServer encountered the following error while attempting to obtain the
capabilities document from the server:
sun.security.validator.ValidatorException: PKIX path building failed:
sun.security.provider.certpath.SunCertPathBuilderException: unable to find
valid certification path to requested target

Error in wmsinfo (line 316)
capabilities = getDocument(server, timeoutInSeconds);

Has the NASA server changed again to cause this issue?

P.S. I'm using R2018b

[Jeremy P]

any updates from mathworks staff? I'm having the same problem. It seems the old and new nasa address no longer works:

info = wmsinfo('https://data.worldwind.arc.nasa.gov/elev?');

Error using wmsinfo>getDocument (line 348)

WebMapServer encountered the following error while attempting to obtain the capabilities document from the server:

Secure connection to "https://data.worldwind.arc.nasa.gov/elev?REQUEST=GetCapabilities&VERSION=1.3.0&SERVICE=WMS" not established because "Server aborted the SSL handshake". Check your system certificates for expired, missing, or invalid certificates.

Error in wmsinfo (line 316)

capabilities = getDocument(server, timeoutInSeconds);

OR

layers = wmsfind('nasa.network*elev', 'SearchField', 'serverurl');

layers = wmsupdate(layers);

Warning: An error occurred while attempting to update layers from the server,

'http://www.nasa.network.com/elev?'. These layers are being removed from the layer array. The number

of layers from this server that are being removed from the layer array is 9. The error message

returned by the server is: 'The server returned the status 504 with message "Gateway Timeout" in

response to the request to URL

http://www.nasa.network.com/elev?REQUEST=GetCapabilities&VERSION=1.3.0&SERVICE=WMS.'.