Grib free download - GRIB Explorer Plus, GRIB Viewer for Windows 10, Ugrib, and many more programs. LuckGrib it is also very good - not free, but not expensive either. 13 Aug 2020 #5 franksingleton Well-known member. Joined 27 Oct 2002 Messages 4,505 Location. ‘The Biggest Little Yacht Club in the World’ FAKAALOFA LAHI ATU The Niue Yacht Club has, since its inception, been a voluntary organization. A small group of dedicated people interested in things nautical. I am trying to suspend judgement and expectation, but the above screen shot of an HRRR GRIB on LuckGrib, which Craig McPheeters, LuckGrib’s creator, tells me is the highest resolution model available shows at 3 a.m. Tomorrow, Irma’s center passing west of Key West and wind at Marathon of 55 knots, gusting 79.
GRIB (GRIdded Binary or General Regularly-distributed Information in Binary form[1]) is a concise data format commonly used in meteorology to store historical and forecast weather data. It is standardized by the World Meteorological Organization's Commission for Basic Systems, known under number GRIB FM 92-IX, described in WMO Manual on Codes No.306. Currently there are three versions of GRIB.Version 0 was used to a limited extent by projects such as TOGA, and is no longer in operational use.The first edition (current sub-version is 2) is used operationally worldwide by most meteorological centers, for Numerical Weather Prediction output (NWP). A newer generation has been introduced, known as GRIB second edition, and data is slowly changing over to this format. Some of the second-generation GRIB are used for derived product distributed in Eumetcast of Meteosat Second Generation. Another example is the NAM (North American Mesoscale) model.
This free app from PredictWind allows the seamless downloading of multiple GRIB files for your coastal or offshore passage. The intuitive interface allows you to download and immediately view GRIB files, weather routes, GMDSS text forecasts and Satellite Imagery.
Format[edit]
GRIB files are a collection of self-contained records of 2D data, and the individual records stand alone as meaningful data, with no references to other records or to an overall schema. So collections of GRIB records can be appended to each other or the records separated.
Each GRIB record has two components - the part that describes the record (the header), and the actual binary data itself. The data in GRIB-1 are typically converted to integers using scale and offset, and then bit-packed. GRIB-2 also has the possibility of compression.
GRIB History[edit]
GRIB superseded the Aeronautical Data Format (ADF).
The World Meteorological Organization (WMO) Commission for Basic Systems (CBS) met in 1985 to create the GRIB (GRIdded Binary) format.The Working Group on Data Management (WGDM) in February 1994, after major changes, approved revision 1 of the GRIB format.GRIB Edition 2 format was approved in 2003 at Geneva.
Problems with GRIB [2][edit]
There is no way in GRIB to describe a collection of GRIB records
- Each record is independent, with no way to reference the GRIB writer's intended schema
- No foolproof way to combine records into the multidimensional arrays from which they were derived.
- The use of external tables to describe the meaning of the data.
- No authoritative place for centers to publish their local tables.
- Inconsistent and incorrect methods of versioning local tables.
- No machine-readable versions of the WMO tables (now available for GRIB-2, but not GRIB-1)
GRIB 1 Header[edit]
There are 2 parts of the GRIB 1 header - one mandatory (Product Definition Section - PDS) and one optional (Grid Description Section - GDS). The PDS describes who created the data (the research / operation center), the involved numerical model / process (can be NWP or GCM), the data that is actually stored (such as wind, temperature, ozone concentration etc.), units of the data (meters, pressure etc.), vertical system of the data (constant height, constant pressure, constant potential temperature), and the time stamp.
If a description of the spatial organization of the data is needed, the GDS must be included as well. This information includes spectral (harmonics of divergence and vorticity) vs gridded data (Gaussian, X-Y grid), horizontal resolution, and the location of the origin.
Software[edit]
Applications[edit]
A number of application software packages have been written which make use of GRIB files. These range from command line utilities to graphical visualisation packages.
- ATMOGRAPH ModelVis Commercial numerical weather model data visualization software capable of decoding and displaying both GRIB 1 and GRIB 2 data formats
- ArcGIS Market leading GIS software
- Expedition – Expedition is the Sailing navigation and weather application. Grib display and download from many sources is free.
- [1] cfGrib is a State-Of-the-Art grib parsing tool for python based on ecCodes from ECMWF.
- WGRIB Command line based program to manipulate, inventory and decode GRIB1 files
- GrADS, free command line based desktop application that directly handles GRIB1 and GRIB2 files [3]
- Picogrib GRIB 1 C-language (FORTRAN callable) free decoding package compatible to some extent with ECMWF GRIBEX routine
- NCEP codes free software (C and FORTRAN library) for decoding and encoding data in GRIB 1 format
- NCEP codes free software (C and FORTRAN library) for decoding and encoding data in GRIB 2 format (some template only)
- JGrib - Jgrib is a free library for reading GRIB files in Java.
- Meteosatlib - Meteosatlib is a free software C++ library and set of tools to convert satellite images between various formats; it can read and write GRIB data, and its GRIB encoding/decoding library can be used standalone.
- Mathematica, a general mathematical, statistical, and presentation application directly handles GRIB files and can map them with many projections
- The NCAR Command Language can be used to read, analyze and visualize GRIB data, as well convert it to other gridded data formats.
- PyNIO is a Python programming language module that allows read and/or write access to a variety of data formats using an interface modelled on netCDF.
- degrib (AKA NDFD GRIB2 Decoder) is a reader for GRIB 1 and GRIB 2 files.
- wgrib2 is a reader for GRIB 2 files.
- GRIB API is an API developed at ECMWF to decode and encode GRIB edition 1 and 2 data. Note: this package has now been replaced by ecCodes which is a superset of GRIB API. A useful set of command line tools is also included. ECMWF also offers the plotting package Magics and the Metview workstation/batch system to handle/visualise GRIB files.
- Ugrib – Ugrib is a no cost graphical GRIB viewer designed for reading GRIB 1 files. The website GRIB.US also aims to provide education on the prudent and safe use of GRIB data for forecasting weather. This link is not working as of 20 May 2017.
- SmartMet - SmartMet is a Windows tool that reads, writes and visualises GRIB data.
- Xconv/Convsh – Xconv is a graphical tool for displaying and converting gridded data, and is available for most operating systems. Convsh is the command-line equivalent.
- The NetCDF-Java Common Data Model is a Java library that can read GRIB 1 and GRIB 2 files.
- zyGrib a graphical software for Linux, Mac OS X and Windows (GPL3, Qt) to download and display GRIB 1 and GRIB 2 (since v8.0) files.
- XyGrib started as a fork of zyGirb 8.0.1. It is a multiplatform software also.
- GDAL, a popular open source reading and writing library for geospatial data
- PredictWind Offshore App A multi platform app designed for boats heading offshore with a need to download forecast GRIB data on a Satellite or SSB connection .
- LuckGrib an app available on macOS, iOS and iPadOS, designed for sailors and other weather enthusiasts. LuckGrib provides easy access to many GRIB weather models. In addition, several ocean current and wave models are provided. Data can be downloaded via the internet, satellite or email.
- PyGrib A python language extension module which allows one to read and write GRIB 1 and GRIB 2 formats.
- PolarView A navigation application that includes a GRIB viewer, supporting both GRIB 1 and GRIB 2. PolarView includes a GRIB download service for GFS (wind/atmospheric pressure), NWW3 (wave height/direction) and RTOFS (Atlantic currents) data from NOAA. Available for Linux, Mac and Windows.
- OpenCPN Open Source Chart Plotter / Marine Navigator. For day to day cruising or advance route planning. (NOTE: GRIB support is available since version 1.3.5 beta)
- CDO (Climate Data Operators) is an analysis tool for geoscientific data with GRIB support
- IDV is a meteorologically oriented, platform-independent application for visualization and analysis of GRIB1, GRIB2 and NetCDF files.
- SoftwareOnBoard A marine navigation application for Windows that includes GRIB overlays on the chart.
- GribAE A freeware Windows interface for WGRIB.
- qtVlm a free software for linux, windows, mac, android, raspberryPi and iOS, with an interface with GPS and routing functions (+ an interface with virtual sailing game VLM)
- PyNDFD an open source Python module for retrieving real-time forecast data from the US National Weather Service. GRIB formatted data is cached and parsed to give the developer access to dozens of up-to-date weather forecast variables. Data is available for the next 7 days for any coordinate within the United States.
- Weather4D This application processes GRIB files (about 35 weather/wave/current models available) to create weather forecasts which can be animated in 3D HD. The 'Routing' version provides also weather routing capabilities based on selected models and polar data, location management. The 'Routing & Navigation' version adds navigation features such as NMEA interface, AIS, nautical charts, instrument panels, track recording.
- glgrib This application displays GRIB2 fields with OpenGL. Raster, contour, vector, colorbar, mapscale, coastlines, borders. Lat/lon, lambert, gaussian grid. It is possible to look at fields interactively (move, zoom, etc.). High resolution fields (2.5km and 1.25km global) have been displayed using glgrib.
Mobile Apps[edit]
iOS[edit]
Several iOS Apps support the GRIB format, including:
Android[edit]
Several Android Apps support the GRIB format, including:
See also[edit]
- Common Data Format (CDF)
- Hierarchical Data Format (HDF)
References[edit]
- ^http://www.wmo.int/pages/prog/www/DPS/FM92-GRIB2-11-2003.pdf
- ^Caron, John. On the suitability of BUFR and GRIB for archiving data
- ^http://cola.gmu.edu/grads/gadoc/grib.html
External links[edit]
- GRIB data of Environment Canada
- www.ecmwf.int GRIB API
Retrieved from 'https://en.wikipedia.org/w/index.php?title=GRIB&oldid=1011316624'
Weather routing is a commercial service provided by commercial companies for cargo ships, to optimize their voyage performance. An adventure version of the same used for sailing boats is referred to as Sailing weather prediction or Sailing weather routing. The latter focusses more on the forecasting and routing of wind and currents for adventurers and competitive sailors participating in ocean sports like yacht races.[1]
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Weather forecasting for sailing involves several activities such as weather training and coaching, dissemination of data for use in navigation and route planning software, race modeling which involves historical weather and sea state analysis for yacht and sail design, trip and adventure planning for distance races and record attempts, monitoring for departure and trip weather windows.[2] It involves several type of events such as day races, long-distance races, around-the-world-races, and record attempts. It is routinely used in races such as Volvo Ocean Race, America's Cup campaigns, and olympic classes regattas.
Weather Routing (Maritime Commercial)[edit]
A number of large cargo ships use weather routing services for ocean passages. They are primarily geared towards protecting owners and charterers from speed claims, a secondary use being to reduce fuel consumption and improve ETAs (estimated time of arrival). There exist a large number of such ocean weather routing companies, such as WNI, Ocean routes, Storm Geo AWT(formerly Applied Weather technology),[3] WRI and SPOS.[4] Promoters of weather routing companies cite high fuel savings due to their use, while many mariners tend to be sceptic of their advantages due to a large number of maritime accidents (such as the sinking of the Derbyshire, and the parametric rolling of APL China) and cargo damages that continue to occur even when vessels follow routing advice. Most routing programs employ the Dijkstra algorithm and do not consider the different responses of each ship to the same weather, as the latter is difficult to estimate.[1]
Long-distance sailboat races[edit]
Weather forecasting for long distance races is based on dissemination of meteorological data, most often in GRIB format, for use in navigation and route planning software and yacht characteristics (polars), providing guidance, as well as analysis of historical weather and sea state data.
GRIB[edit]
GRIB (GRIdded Binary) is a concise data format commonly used in meteorology to disseminate forecast weather data. For sailing purposes the GRIBs are transmitted and received at sea. These GRIBs contain only small subset of surface data, usually winds (direction and wind speed), information about wave strength (proportional to significant wave height) and direction, surface pressure. The data is further reduced by providing its subset around the position of a yacht. The data is transmitted over satellite phones and single side band radios.
Software for optimal weather routing[edit]
Modern sailing weather forecasting involves transmission of weather forecasts which are used in on-board software which simulates optimal (and safest) routing in distance races. The data is often transmitted in form of GRIB files or similar which are customized for specific areas. These files are suitable for use in popular routing and tactical racing software such as Expedition, MaxSea TimeZero, Adrena, Deckman, Raytech Navigator/Sail Racer, Sailplanner, SailFast, OpenCPN, SailGrib or LuckGrib.
Weather routing applications[edit]
Ssl robotics pasadena address. There are several applications that calculate a yacht's point to point route based on weather prediction and polars (the boat's performance specs):
- VRTool regatta tool for sailboats (Windows)
- Zezo Sailing Simulator (Web-based) Zezo Sailing Simulator works for various sail racing games and does not support entering one's own boat polars.
- PredictWind.com (Web-based, Android & iPhone mobiles) This site advertises 'outstanding accuracy' with no evidence proffered.
- savvy navvy (Web-based, Android & iOS)
- Sailplanner (Windows, OS X)
- OpenCPN Weather Routing Plugin Free Software (Windows, Linux, OS X)
- qtVlm (Windows, Linux, MacOS, Android, iOS, Raspberry)
- FastSeas (Web-based, automated email responder)
- MaxSea (Windows)
- SailFast (Windows)
- SailGrib (Android)
- LuckGrib (macOS, iOS, iPadOS)
Olympic sailing[edit]
Weather forecasting for olympic class sailing is a form of nowcasting predicting weather and currents in approximately 0–6 hours timeframe. Even though understanding of synoptic weather conditions is of importance but mesoscale and local scale events take precedence. The forecast includes predictions of the sea-breeze onset, turbulent winds shifts, coastal jets, changes in tidal currents, fog, as well as wind acceleration and directional changes associated with clouds.
Yacht design[edit]
Weather routing has been used as a simulation tool to assist yacht designers to produce the fastest design for the anticipated conditions of the event, in conjunction with VPP software to predict the boat's performance.
The key issue here is that the designer is interested in the outcome using a wide range of likely weather conditions, whereas the navigator on board a yacht is just interested in using the latest weather forecast. Initial attempts in this area used the mean wind speed and direction data from sources such as Pilot Charts, but this is not truly representative, and the correct route is to run the weather routing a large number of times from a set of historical weather records, and then carry out a statistical analysis of the results.
Two examples of this follow, both developed by Tim Thornton of Smartcom Software (previously TT Designs).
For the 1977 Whitbread Round the World Race, Tracy Edwards' Maiden campaign was hoping to commission a new boat to be built for the event, and went to Tony Castro as the designer. Tony used Tim Thornton to do a comparison of a number of candidate designs, and this was done using 100 different sets of weather conditions for each leg of the race. In the end, the money could not be raised for a new boat, but the weather routing simulation was repeated for the boat she bought, both to optimize the design for the anticipated conditions, and to assist the navigator in developing a strategic plan for the race.
For the 1988 America's Cup, the UK's Blue Arrow Challenge followed two routes: designing a monohull strictly in accordance with the Deed of Gift, or a multihull like the American entry. Tim Thornton was engaged by the monohull team to produce an analysis of the optimal design under the Deed of Gift. To do this, he combined his weather routing simulation software with a model that automatically generated possible hull designs and predicted their performance, thereby allowing a large number of design parameters to be investigated rapidly. This showed that, for the anticipated light airs of San Diego, the best design would be a small, light, and heavily canvassed design like an overgrown 18' skiff.
The Math[edit]
This section is not detailed enough to show the statistical tests to determine accuracy and confidence level: for example, with iscochrones or fixed grid points no method to evaluate probability of forecast success is implied or stated. This section seems to be written by non scientists, hence the section name 'The Maths'.Weather routing is an optimisation problem, whereby it is required to determine the lowest cost (i.e. shortest time) route across a network, where the cost of traversing each link in the network varies with time, as the wind speed and angle changes, changing the boat's speed. This is generally solved using Dynamic Programming.
In most implementations, the boat travels in fixed time steps (e.g. 3 hourly) and at fixed angles (e.g. 5 degree intervals), with distance being the free variable. This results in the creation of isochrones, showing the set of possible positions of the boat at a given time, which are a useful tool for the navigator. However, with this approach it is not easy to compare multiple runs, and so another approach used for design purposes is to navigate across a fixed grid of points, with time being the free variable. This is more amenable to statistical analysis of the ensuing routes.
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References[edit]
Luckgrib For Android
- ^ abHenry, Chen. 'Voyage Optimization Versus Weather Routing - a whitepaper'(PDF). www.c-map.no. Cmap / Jeppesen / Boeing. Retrieved 27 July 2017.CS1 maint: discouraged parameter (link)
- ^Chapter 37 - Principles of weather routing(PDF). Washington DC: NIMA - National imagery and mapping agency. Retrieved 27 July 2017.CS1 maint: discouraged parameter (link)
- ^'Our history'. www.stormgeo.com. Storm Geo. Retrieved 24 October 2017.CS1 maint: discouraged parameter (link)
- ^'The case of MV APL China'. CargoLaw.com. Countryman & Daniel. Retrieved 27 July 2017.CS1 maint: discouraged parameter (link)
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Bibliography[edit]
Luckgrib
- David Houghton and Fiona Campbell, Wind Strategy, 2005, ISBN978-1-904475-12-5
- Tim Thornton, A Review of Weather Routing of Sailboats, Journal of Navigation Vol. 46 No. 1 pp 113–129
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Retrieved from 'https://en.wikipedia.org/w/index.php?title=Sailing_weather_prediction&oldid=1001885197'