DWD: Add missing radar site "Emden" (EMD, wmo=10204)

[amotl]

Hi there,

according to wradlib/wradlib-notebooks#49 (comment), Emden is missing in the official publication koordinaten-radarverbund.pdf. Thanks for spotting this, @kmuehlbauer.

a) This patch adds it back. Can you verify the coordinates, Kai?
b) We should also notify [email protected] about it.

With kind regards,
Andreas.

[codecov]

Codecov Report

Merging #335 (88ce9cc) into main (43bd45c) will increase coverage by 0.11%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #335      +/-   ##
==========================================
+ Coverage   90.33%   90.44%   +0.11%     
==========================================
  Files          54       54              
  Lines        2783     2784       +1     
  Branches      284      284              
==========================================
+ Hits         2514     2518       +4     
+ Misses        213      211       -2     
+ Partials       56       55       -1     

Flag	Coverage Δ
unittests	90.44% <100.00%> (+0.11%)	⬆️

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Impacted Files	Coverage Δ
wetterdienst/dwd/radar/sites.py	45.00% <100.00%> (+0.93%)	⬆️
wetterdienst/dwd/radar/access.py	90.00% <0.00%> (+2.72%)	⬆️

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[kmuehlbauer]

a) This patch adds it back. Can you verify the coordinates, Kai?

At least they are the same as in the wradlib documentation. I think I took it from the Komposit-Format description

b) We should also notify [email protected] about it.

Yes. It would be good, if they would maintain a document which lists the current radar stations (as of now) and keep track of stations which have been relocated or being used while others haven been reconstructed.

[gutzbenj]

Thanks for taking care, @amotl !

[amotl]

Hi again,

thanks for your insights. While I can't find back the reference, you told us the other day that within wradlib/wradlib-notebooks you might have used an outdated version of the list of radar sites.

Now, when looking at the situation again, the document Metadata on the radars of the DWD radar network (koordinaten-radarverbund.pdf) was updated in April, 2018 while the document Description of the "Komposit-Format" Version 2.5.1 (radolan_radvor_op_komposit_format_pdf.pdf) was updated in October, 2020.

So, I conclude we should actually adjust the PDF parser [1] to use the more recently updated document as a reference. After distilling a patch from that, we will see what might have changed. To go forward on this, I will merge this patch and then eventually submit another one.

On the other hand, it obviously would be perfect if we could find a machine readable source for this data. But this is still amiss as far as you know?

With kind regards,
Andreas.

[1] https://github.com/earthobservations/wetterdienst/blob/v0.13.0/wetterdienst/dwd/radar/sites.py#L178-L287

[amotl]

According to [1] p. 16, the radar site in Emden went out of service on 2018-02-27. Apparently, ASR Borkum is the replacement site for Emden since 2018.

ASR=Ausfallsicherungsradar: Während der Erneuerung der alten Single- zu Dual-Pol-Doppler-Radaren im Rahmen des Projekts RadSys-E war ein ASR zur Aufrechterhaltung der Wetterüberwachung am Standort Essen, Feldberg, Rostock bzw. Dresden in der Zeit von 2010 bis 2015 in Betrieb. Seit 2018 wird das ASR als Ersatz des Radars Emden auf Borkum eingesetzt.

So, we might want to remove EMD again - or shall we also maintain defunct sites for historical reasons in this list, @kmuehlbauer? Just let me know if you are occasionally processing old data or whether it would be safe to remove it again. Thanks!

[1] https://www.dwd.de/DE/leistungen/radolan/radolan_info/radolan_radvor_op_komposit_format_pdf.pdf?__blob=publicationFile

[kmuehlbauer]

Thanks @amotl, as DWD keeps historic RADOLAN data and this data is widely used for scientific purposes it would be good to have all radar site locations available.