science

WXXM (data model)

WXXM (data model) is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand WXXM (data model) rather than just read about it. In short: The Weather Information Exchange Model (WXXM) is designed to enable the management and distribution of weather data in digital format (XML). WXXM version 2.0, set to be finalized in 2014, is based on Geography Markup Language (GML) and is one of the GML Application Schemas.

Key takeaways

WXXM (data model) belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect WXXM (data model) to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of WXXM (data model) from memory before moving on to harder problems.

Reference excerpt

The Weather Information Exchange Model (WXXM) is designed to enable the management and distribution of weather data in digital format (XML). WXXM version 2.0, set to be finalized in 2014, is based on Geography Markup Language (GML) and is one of the GML Application Schemas. It is being developed by the US Federal Aviation Administration (FAA) and the European Organisation for the Safety of Air Navigation (EUROCONTROL). WXXM is a member of a family of data models designed for use in aviation safety, notably Aeronautical Information Exchange Model (AIXM) and the Flight Information Exchange Model (FIXM).

Purpose As of 2014, WXXM is an extension of IWXXM, which represents the operationally exchanged meteorological information defined by the International Civil Aviation Organization (ICAO). WXXM uses a similar design approach to IWXXM, but can represent additional types of weather information not covered in IWXXM.

Model WXXM has two main components. The package as a whole is referred to as WXXM:

The WXXM Conceptual Model (WXCM) The WXXM XML Schema (WXXS)

History WXXM 1.0 was introduced in 2007, representing METAR, SPECI, TAF, SIGMET and other ICAO information as specified in International Civil Aviation Organization (ICAO) Annex III. WXXM 1.1 was released in 2010 with a number of additional products beyond ICAO Annex 3. WXXM 2.0 was released in 2014 as a major update. WXXM 2.0 removed data products that are authoritatively represented by ICAO in IWXXM 1.0 (METAR, SPECI, TAF, SIGMET) and incorporated IWXXM 1.0 design approaches.

WXXM Conceptual Model The WXXM Conceptual Model is a conceptual model of the meteorological domain. It describes the features and their properties (attributes and associations) within the domain. Therefore, it can be used as the logical basis for weather databases. The model is designed using the Unified Modelling Language (UML).

WXXM XML Schema The WXXM XML Schema is an exchange model for weather data. It is an implementation of the Conceptual Model as an XML schema. Therefore, it can be used to send weather information to others in the form of XML encoded data, enabling systems to exchange weather information.

See also AIXM IWXXM TAF METAR SPECI SIGMET

References

External links WXXM home page http://www.eurocontrol.int/services/weather-information-exchange-model-wxxm

Worked examples

Example 1 — a first encounter with WXXM (data model)

Start with the simplest possible case. Write down what WXXM (data model) claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to WXXM (data model) before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about WXXM (data model) ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of WXXM (data model)

In research: WXXM (data model) appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses WXXM (data model) in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: WXXM (data model) is common in secondary-school and first-year university syllabi. It links to neighbouring topics GIS file formats, Industry-specific XML-based standards, so understanding it makes those chapters shorter.
In everyday life: Look for WXXM (data model) outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study WXXM (data model) in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what WXXM (data model) means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain WXXM (data model) out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is WXXM (data model) in simple terms?

Why does WXXM (data model) matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study WXXM (data model)?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on WXXM (data model).