topographic map
Let an agent explain topographic maps, relay contours, symbols, datums, production and uses from cartography sources, describe the named products and note the digital elevation model and aeronautical chart distinctions, and distinguish topographic maps from thematic maps, road maps, geological maps and satellite imagery.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify
Researched by: Claude
Purpose and description
Let an agent explain topographic maps, relay contours, symbols, datums, production and uses from cartography sources, describe the named products and note the digital elevation model and aeronautical chart distinctions, and distinguish topographic maps from thematic maps, road maps, geological maps and satellite imagery.
A map that shows the shape and elevation of the land surface, typically with contour lines, along with natural and human features such as rivers, roads, settlements and vegetation, produced by national mapping agencies; related products the registry aliases name include the Canadian National Topographic System maps, topographic orthophotomaps combining imagery and contours, digital elevation models, which are datasets rather than printed maps, aeronautical charts, which are a different navigation product, and military topographic maps. Topographic maps are used for planning, navigation and hazard assessment, and navigators should also carry a compass or GNSS and check that maps are current.
What it is for: Representing terrain and features for planning and navigation.
It can be explain contours and symbols; relay datums and production; describe named products; relay navigation use.
Distinguishing features
Contour lines
Standard symbols
Grid and datum
Multi-feature
What it looks like
Maps with brown contour lines, blue water, and symbols for roads, buildings and vegetation.
Physical character
contour interval: varies with scale and terrain note
common scales: 1:24,000 to 1:50,000 note - national series
registry parent: physical geography map note
How it is recognised
Map showing terrain shape and features
NTS topographic map, aeronautical chart, topographic military map, topographic orthophotomap, digital elevation model, topographical map of Brazil
Thematic maps show one theme; road maps focus on routes; geological maps show rock; satellite imagery is unprocessed photos
Related models
is a kind of - in registry terms
uses -
is contrasted with -
is contrasted with - dataset
In practice
Families and kinds
national topographic series
military topographic maps
orthophotomaps
digital elevation models
Standards and regulation
National mapping agency standards
Geodetic datum standards such as WGS84
ISO 19100 geographic information series
Failure modes and hazards
Relying on outdated maps for navigation
Datum mismatches
Confusing DEMs with maps
Also called
Where this came from
wikidata · CC0 1.0
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 4 bundles · 8 layers · 8 findings · 16 questions.
Understand What a topographic map is.
Definition.
Definition
Definition.
Definition
Definition.
- Is someone navigating in the backcountry, in which case a current map plus a compass or GNSS and weather information should be used? boundary
- What is a topographic map, and how does it differ from thematic maps, road maps, geological maps and satellite imagery? definition
Products
Named products.
Products
Products.
- What are NTS maps, orthophotomaps, digital elevation models and aeronautical charts? definition
- Which entry fits the specific product? action
Reading Reading maps.
Science.
Contours
Contour lines.
Contours
Contours.
- How do contour lines show slope and elevation? provenance
- Which references are standard? provenance
Symbols
Symbols and grids.
Symbols
Symbols.
- How are symbols, grids and datums used to read maps? provenance
- Which sources are cited? provenance
Production Production.
Sources.
Survey
Surveying and photogrammetry.
Survey
Survey.
- How are topographic maps made from surveys, aerial photos and lidar? provenance
- Which entry fits photogrammetry? action
Agencies
Mapping agencies.
Agencies
Agencies.
- How do agencies such as the USGS and Ordnance Survey produce map series? provenance
- Is the information current? boundary
Context Uses.
Sources.
Navigation
Navigation.
Navigation
Navigation.
- How are topographic maps used with a compass for navigation? provenance
- Which entry fits orienteering? action
Digital
Digital mapping.
Digital
Digital.
- How have digital elevation models and web maps changed topographic mapping? provenance
- Is the presentation neutral and attributed? boundary
What the second pass must settle
- Should digital elevation models be moved to dataset entries?
- Should aeronautical charts be a separate entry?
- How should national map series be linked?