Basemap
Reference information beneath the main subject of a map, such as streets, terrain, or labeled places. Choose it to support the question rather than overwhelm the foreground.
Explore Insta Carta Maps ↗THE POCKET GLOSSARY / 25 USEFUL TERMSLESS JARGON.
LESS JARGON.
MORE BEARINGS.
A plain-language starting point for the words you meet in maps, measuring tools, AI workflows, and route planning.
Use a definition to get oriented, then follow its field guide for context and a primary source. The examples here describe concepts, not specifications for every mapping product.
Cartography
The practice of selecting, organizing, and presenting geographic information so that a map communicates a purpose clearly.
Explore Insta Cartography System ↗Coordinate reference system
A framework for interpreting positions. Record the one used by each source and by the working project, especially when combining layers.
Explore Insta Cartography System ↗Map projection
A way to represent a curved geographic surface on a plane. Different choices involve tradeoffs, so the purpose of the map matters.
Explore Insta Cartography System ↗Scale
The relationship between represented dimensions and the dimensions they describe. A purely schematic illustration may not preserve geographic scale.
Explore Insta Carta Maps ↗Legend
The explanation of a map’s meaningful symbols, categories, and line patterns. It should match the current map rather than an earlier design.
Explore Insta Cartography System ↗Latitude
An angular coordinate describing north–south position relative to the equator. Interpret it together with the coordinate framework and longitude.
Explore City Mapping Software ↗Longitude
An angular coordinate describing east–west position relative to a reference meridian. Check coordinate order when transferring data between formats.
Explore City Mapping Software ↗Waypoint
A specified location used to describe or organize a journey. A waypoint should identify the useful arrival position, not merely the center of a large place.
Explore Instant Map Route Finder ↗Geocoding
Converting a place description or address into a proposed geographic position. Review the result, especially where a building has several entrances.
Explore Insta Carta Maps ↗Georeferencing
Associating an image or other material with a coordinate framework using reference information. Keep the original and document the alignment choices.
Explore Vintage Cartography Maps ↗GeoJSON
A geographic data exchange format described by RFC 7946. The city mapping article links to the specification and discusses coordinate-order checks.
Explore City Mapping Software ↗Vector layer
Geographic information represented through objects such as points, lines, and polygons, often with descriptive attributes attached.
Explore City Mapping Software ↗Raster
Information arranged in a grid of cells, including many scanned map images. Its appearance does not by itself explain its geographic reference.
Explore Vintage Cartography Maps ↗Attribute
A descriptive value attached to a geographic feature, such as a name, type, source note, or review status. Define field meanings consistently.
Explore City Mapping Software ↗Polyline
A connected sequence of line segments. Its total length adds the segments rather than measuring only the separation of its endpoints.
Explore AI Map Measuring Tool ↗Polygon
A closed shape that can represent an area. Inspect its boundary, closing edge, and any exclusions before interpreting a measurement.
Explore AI Map Measuring Tool ↗Perimeter
The length around a closed boundary. It is a distance quantity, distinct from the area enclosed by that boundary.
Explore AI Map Measuring Tool ↗Planar measurement
A measurement made in a flat coordinate space. The local demo uses a clearly labeled fictional planar grid to explain its arithmetic.
Explore AI Map Measuring Tool ↗Ellipsoidal measurement
A geographic measurement using an ellipsoidal model. Software settings and source coordinates need to be understood before comparing it with a planar result.
Explore AI Map Measuring Tool ↗Routing profile
The configuration of a routing network for an intended mode or set of rules. A familiar-looking line does not tell you which profile produced it.
Explore Instant Map Route Finder ↗Time window
An interval within which a visit is intended or required to occur. Distinguish confirmed constraints from flexible preferences in an itinerary.
Explore Route Planning AI ↗Service duration
Time assigned to the activity at a stop. Omitting it can make a route’s moving time look like a complete itinerary when it is not.
Explore Route Planning AI ↗Provenance
The source and history of information. A useful map project preserves enough context to explain where a feature or claim came from.
Explore Vintage Cartography Maps ↗Human review
An explicit check of an assistant’s proposed output against the task and available evidence. Preserve suggestions separately from accepted edits.
Explore Carta AI Mapping Software ↗