isoline
Equal-value curve
An isoline is a line on a map connecting points of equal value—equal elevation, temperature, atmospheric pressure, or other measurable quantity.
Contour lines showing terrain are isolines; so are isobars on weather maps.
The prefix *iso-* means equal, and isolines go by specific names depending on what they measure: isotherms for temperature, isobaths for water depth.
Bounding line of shape
- topographyPhysical feature mapping
- elevationHeight above reference point
- isochroneLine of equal travel duration
- gradientRate of change across space
relief · profile · projection · GIS · geospatial · atlas · chart · grid
Height above reference point
- ridgeNarrow raised strip
- valleyLow ground between heights
- slopeAngled terrain or steepness
- landformNatural terrain feature
plateau · summit · peak · altitude · gradient · escarpment · hill · mountain
Line of equal travel duration
Force upon contact
- temperatureMeasured heat intensity
- frontForward-facing side
- weatherAtmospheric state outdoors
- forecastPrediction of future conditions
atmosphere · precipitation · wind · climatology · barometric · humidity · atmospheric · synoptic
Duration between two points
- interpolationEstimating between known values
- precisionAccuracy of measurement
- resolutionFormal decision or determination
- dataFacts for analysis
accuracy · sampling · gradient · threshold · calibration · spacing · density · smoothing
contour
Bounding line of shape
- topographyPhysical feature mapping
- elevationHeight above reference point
- isochroneLine of equal travel duration
gradient · relief · profile · projection · GIS · geospatial · atlas · chart · grid · scale
elevation
Height above reference point
landform · plateau · summit · peak · altitude · gradient · escarpment · hill · mountain · depression
isochrone
Line of equal travel duration
pressure
Force upon contact
- temperatureMeasured heat intensity
- frontForward-facing side
- weatherAtmospheric state outdoors
forecast · atmosphere · precipitation · wind · climatology · barometric · humidity · atmospheric · synoptic
interval
Duration between two points
- interpolationEstimating between known values
- precisionAccuracy of measurement
- resolutionFormal decision or determination
data · accuracy · sampling · gradient · threshold · calibration · spacing · density · smoothing · analysis
- Map Termslatitude, longitude, equator, meridian, prime meridian
- Topographycontour lines, terrain maps, terrain map, elevation gain, contours
- contoursoutline, profile, silhouette, curve, curvature
- isolinesisochrone, isocline
- contour linescontour map, topo map
- mapsroad map, world map, atlases, street map, regional map
isolineboundary line
Edge separating two areas
transition zone · discontinuity · demarcation line · border · dividing line
line, lineage, iso, linear, isotope, isosceles, isometric, isobar, isotherm