Main Features

Main Features

• Works "out of the box".
• Can be used as a client to Nbsp (The NOAAPort Broadcast System Processor), and it has been optimized for this role.
• It can also get the data from any number of byte blaster servers, which is the default configuration when it is installed by an rpm or bsd package.
• It can also be configured to injest from an emwin serial device.
• It can register itself with the NWS master host as a "public" BB server.
• It can serve any number byteblaster clients. There is no hard-coded limit.
• It has a built-in web server (based on tclhttpd).
• It stores all the files received in a directory and file format compatible with many windows programs, in particular Digital Atmosphere, IDV and GrLevel. The filter is enabled by default and no further configuration is required.
• Metar data files are processed to produce text reports, which are readily accessible from the web interface of the built-in web server. A facility is provided to define groups of stations ("collectives") as a set with a unique name to track the observations from that group as one unit. There is direct support for the MetarWeather program for Windows. The data from each station or collective is summarized in a directory which can be exported via samba and the data files are immediately accessible to the MetarWeather program. The metar observations data is displayed in graphical form in the web interface. Plots are generated for the temperature, dew point, relative humidity, pressure and wind speed for any station. The observing station locations is displayed in the reports.
• The latest copy of every file received is saved in a separate "data/latest" subdirectory, index by file type and WFO.
• It can send the files to an ldm server for distribution or for saving the files in a directory structure such that they can be used with Gempak. (One use of this is to allow npemwin to be used as a backup to a noaaport system.)
• The "gpfilter" stores files received in a Gempak-compatible directory structure, so that the data can be use directly by the Geampak programs. The Gempak software must be installed, but ldm is not required.
• It can send every file received to a "news" server such as inn for distribution by nntp.
• RSS feeds are created for all the text files, and they are accessible through the built-in web server.
• It has a hurricane tracking filter, "trackfilter". Each time a hurricane advisory/forecast is received, the filter extracts the relevant data, updates the tarck data file, and updates the track plot. It uses GrADS to do the actual plot, via a set of scripts and templates that are customizable and extensible.
• It is scriptable. For each file received, a script (or any program) or actually any number of them, will be invoked to process the files received. The built-in facilty can be bypassed altogether and replaced by your own.
• It keeps a complete inventory of every file received by the minute for the last 24 hours. The catalog files and the data files themselves are accessible from the web interface for the last minute, last hour and last 24 hours.
• Npemwin can be set to drop privileges and run as an ordinary user by setting the variables

  	set user
  	set group
  

  in the configuration file.
• A user-configurable scheduler, which runs every minute, can be used to execute any program either regularly or at specified times. It is used now to rotate log files and execute the hourly cleanup script, so that it is not necessary to install any cron jobs for this.

Main Features