Cartopy wmts KeyError issue : Content metadata for layer "AMSUA_NOAA15_..." already exists

[CTOH-LEGOS]

#Since a while, I am using the wmts function of cartopy but since last week this function does not works returning this error:

KeyError: 'Content metadata for layer "AMSUA_NOAA15_Brightness_Temp_Channel_10" already exists'

The run code is coming from the cartopy web doc.

below the code:

`
import matplotlib.pyplot as plt
import cartopy.crs as ccrs

def main():
url = 'https://map1c.vis.earthdata.nasa.gov/wmts-geo/wmts.cgi'
layer = 'VIIRS_CityLights_2012'

 fig = plt.figure()
 ax = fig.add_subplot(1, 1, 1, projection=ccrs.PlateCarree())
 ax.add_wmts(url, layer)
 ax.set_extent([-15, 25, 35, 60], crs=ccrs.PlateCarree())

 ax.set_title('Suomi NPP Earth at night April/October 2012')
 plt.show()

if name == 'main':
main()
`

The issue come from _buildMetadata method into WebMapTileService class. The function called gather_layers raise an KeyError if there are duplicated element... But It should be better to add elements if they are not already in the dictionary called "contents"? And just add a warning for duplicate layers.

Below example to fix this issue:
def gather_layers(parent_elem, parent_metadata): for index, elem in enumerate(parent_elem.findall(_LAYER_TAG)): cm = ContentMetadata( elem, parent=parent_metadata, index=index + 1,parse_remote_metadata=parse_remote_metadata) if cm.id: if not cm.id in self.contents: self.contents[cm.id] = cm else: warnings.war('Content metadata for layer "%s" ' 'already exists' % cm.id) gather_layers(elem, cm)

Thank for help.
Fabien Blarel

[nickdodds]

I tried to implement this in my version, and it then triggered a load more KeyErrors later in the _buildMetadata method. I also had to just change these to warnings.warn (not .war?...). Seems to kick up a fuss but got the end result for me. Thanks for posting this!

[zfasnacht]

Any plans to permanently fix this in future updates? Seems it's even breaking active online examples of it's use...

https://scitools.org.uk/cartopy/docs/v0.19/gallery/web_services/wmts_time.html

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