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radolan -l Willich -z 30
should show 30x30 km around Willich in a "zoomed" mode

radolan -l Willich -z 40
would show 40x40 km and so on ...

see ftp://ftp.dwd.de/pub/data/gpcc/radarklimatologie/doi_landingpage_2017.002.html
https://opendata.dwd.de/climate_environment/CDC/grids_germany/hourly/radolan/reproc/2017_002/bin/

on 2018-08-29 08:50:

radolan "2018-08-26 23:50" -l Willich
Aug 29, 2018 8:49:55 AM com.bitplan.radolan.ErrorHandler handle
WARNUNG: Error java.io.FileNotFoundException:https://opendata.dwd.de/weather/radar/radolan/sf/raa01-sf_10000-1808262350-dwd---bin
Aug 29, 2018 8:49:55 AM com.bitplan.radolan.ErrorHandler handle
WARNUNG: Stacktrace: java.io.FileNotFoundException: https://opendata.dwd.de/weather/radar/radolan/sf/raa01-sf_10000-1808262350-dwd---bin

this should automatically get the results from
ftp://ftp-cdc.dwd.de/pub/CDC/grids_germany/daily/radolan/recent/
ftp://ftp-cdc.dwd.de/pub/CDC/grids_germany/daily/radolan/recent/raa01-sf_10000-1808262350-dwd---bin.gz

ftp://ftp-cdc.dwd.de/climate_environment/ is the new link

to speed up processing and reduce serverload files from "known" URLs should be cached locally by default.
For a start:

• https://opendata.dwd.de/weather/radar/radolan/
• ftp://ftp-cdc.dwd.de/pub/CDC/grids_germany/daily/radolan

if the url does not have a -latest- in it

Thanks for your wonderful work!
I test 'java -jar radolan -i https://opendata.dwd.de/weather/radar/radolan/rw/raa01-rw_10000-2010280850-dwd---bin -o rw2020-10-28_0850.png -st 5' and I can get the right figure.

But when I try to parse the file in 'https://opendata.dwd.de/climate_environment/CDC/grids_germany/5_minutes/radolan/reproc/2017_002/bin/', the program will crash.
For example, I download 'https://opendata.dwd.de/climate_environment/CDC/grids_germany/5_minutes/radolan/reproc/2017_002/bin/2019/YW2017.002_201901.tar', unzip the file and get many files(e.g. raa01-yw2017.002_10000-1901010000-dwd---bin), then I try to parse the file 'raa01-yw2017.002_10000-1901010000-dwd---bin' and the program crashed (errors are shown in the png).

I would appreciate it if you could give me some suggestions, thanks!

e.g.
-p sf latest
-p daily latest
-p hourly latest
-p 5min latest
-p sf 2018-08-26 07:04

ftp://ftp-cdc.dwd.de/pub/CDC/grids_germany/daily/radolan/recent/raa01-sf_10000-1805301650-dwd---bin.gz has negative precipitation data

the -t command line option specifies the number of seconds to display a result
As of version 0.0.1 the software does not stop but only closes the window