Longitude
Longitude is the angular geographic coordinate measuring a location’s position east or west of a reference meridian.
Just Use Postgres!
Longitude is the angular coordinate measuring position east or west of the prime meridian on Earth.
- How it is used
- Uses longitude to convert database points into GPS-style coordinates and place them on map services.
- How deep it goes
- Explains coordinate ordering, SRID transformation, ST_X extraction, and URL construction without deeper coordinate-system theory.
- Examples
- Demonstrates Tampa's city-center point, transformed coordinates, and an OpenStreetMap marker URL.
- What you can do after
- Apply it via PostGIS functions to transform points, extract longitude, and generate map links.
D3.js in Action, Third Edition
Longitude is the angular coordinate specifying an east–west position relative to a reference meridian on Earth.
- How it is used
- Locates cities and other points on D3 maps by supplying longitude with latitude to a geographic projection.
- How deep it goes
- Defines east–west measurement and demonstrates projection-based placement, but does not develop geographic measurement beyond mapping coordinates.
- Examples
- Uses Nobel laureates’ birth cities and GeoJSON polygon coordinates to demonstrate longitude in geographic data.
- What you can do after
- Apply it via D3 projections to place geographic points within an SVG map.
Read how D3.js in Action, Third Edition explains longitude →
Related concepts
- geo_bounding_box queryused by · A geo_bounding_box query retrieves documents whose geographic points or shapes intersect a rectangular geographic boundary.
- geo_point data typeused by · The Elasticsearch geo_point field type represents a geographic location using latitude and longitude coordinates.
- scatter plotused by · A scatter plot is a chart that represents observations as points positioned according to their values on two or more coordinate axes.
- geolocationpart of · Geolocation is the geographic position or place associated with a person, device, object, or event, represented or inferred from location data.
- spatial positioningused by · The placement of a visual element at a location within a visual field.
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