lambert conformal projection
Technical / Low-frequencyTechnical, Academic
Definition
Meaning
A map projection that represents the Earth's surface on a plane by intersecting it with a cone, preserving angles locally but distorting distance and area.
In cartography and GIS, a specific conformal map projection commonly used for mapping large regions with a predominantly east-west extent, such as the contiguous United States or regions at mid-latitudes, where shape preservation is crucial for navigation and meteorological charts.
Linguistics
Semantic Notes
A compound proper noun. The term is often used with the definite article 'the' ('the Lambert conformal projection') and is named after the Swiss mathematician Johann Heinrich Lambert. It is a type of 'conic projection'.
Dialectal Variation
British vs American Usage
Differences
No significant lexical or spelling differences. Usage is identical in both technical communities.
Connotations
Purely technical, no cultural connotations.
Frequency
Identical, low-frequency usage in specialised fields like geography, meteorology, and GIS.
Vocabulary
Collocations
Grammar
Valency Patterns
The [map/chart] is based on [the] Lambert conformal projection.[The] Lambert conformal projection is used for [purpose/region].Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “None”
Usage
Context Usage
Business
Rare, except in companies specialising in mapping, logistics, or GIS software.
Academic
Standard term in geography, cartography, atmospheric sciences, and related technical papers.
Everyday
Virtually never used.
Technical
Core term in cartography, geomatics, and meteorology for describing specific map coordinate systems.
Examples
By Part of Speech
verb
British English
- This data needs to be lambert-conformal-projected onto the national grid.
- We lambert-conformal-projected the regional chart.
American English
- The software can lambert-conformal-project the coordinates.
- They lambert-conformal-projected the entire state dataset.
adverb
British English
- The map was created lambert-conformally.
- The data is projected lambert-conformally.
American English
- The chart is drawn lambert-conformally.
- Transform the points lambert-conformally.
adjective
British English
- The lambert-conformal-projection parameters were set.
- We used a lambert-conformal-projection coordinate system.
American English
- The lambert-conformal-projection map was generated.
- Check the lambert-conformal-projection settings.
Examples
By CEFR Level
- Maps can be drawn in different ways. This one uses a special method.
- For aviation maps, the Lambert conformal projection is often chosen because angles are accurate.
Learning
Memory Aids
Mnemonic
Think of Lambert as a lamb wearing a cone-shaped party hat (conic) that perfectly conforms to its head shape (conformal). This hat is a projection of the Earth's surface.
Conceptual Metaphor
MAPPING IS PROJECTING (a 3D surface onto a 2D plane); PRESERVATION OF SHAPE IS CONFORMITY.
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Avoid translating 'Lambert' (a proper name). Do not translate 'conformal' as 'соответствующий' (matching); the mathematical term is 'конформный'.
Common Mistakes
- Pronouncing 'Lambert' as /læmˈbɜːt/ instead of /ˈlæmbət/.
- Using 'projection' with an indefinite article ('a Lambert...') instead of the definite article.
- Confusing it with other projections like Mercator.
Practice
Quiz
What is the primary property preserved by a Lambert conformal projection?
FAQ
Frequently Asked Questions
No. While both are conformal (shape-preserving), Mercator is a cylindrical projection best for equatorial regions and navigation, whereas Lambert conformal is a conic projection better suited for mid-latitude regions with an east-west extent.
Standard parallels are the lines of latitude where the cone intersects the globe. Scale is true along these lines, and distortion increases away from them. They are chosen to minimise overall distortion for the region being mapped.
It is standard in national topographic mapping (e.g., for the contiguous USA and France), meteorological charts for weather forecasting, and regional GIS applications where shape accuracy is paramount.
It is unsuitable for world maps. As a conic projection, it is designed for a portion of a single hemisphere, typically a region of moderate latitude. World maps require projections like Winkel Tripel or Robinson.