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Isochrone maps have been used in transportation planning since at least 1887. [21] [22] Isochrone maps in the context of transport planning are essentially maps of accessibility where travel time is used as the cost metric. Isochrone maps can be created for different modes of transportation, [23] e.g. foot, bicycle, motor vehicle. Put simply ...
Google Maps is a web mapping platform and consumer application offered by Google. It offers satellite imagery, aerial photography, street maps, 360° interactive panoramic views of streets (Street View), real-time traffic conditions, and route planning for traveling by foot, car, bike, air (in beta) and public transportation.
The instrument is most commonly used to measure the lengths of roads, rivers and other line features on maps. Opisometers designed for this purpose provide scales reading the measured distance in kilometers and miles.
This is most commonly done by combining distance measurements to 4 or more GPS satellites, which orbit the Earth along known paths. [8] Visual fix by three bearings plotted on a nautical chart. The result of position fixing is called a position fix (PF), or simply a fix, a position derived from measuring in relation to external reference points.
The foundations for quantitative map scaling goes back to ancient China with textual evidence that the idea of map scaling was understood by the second century BC. Ancient Chinese surveyors and cartographers had ample technical resources used to produce maps such as counting rods, carpenter's square's, plumb lines, compasses for drawing circles, and sighting tubes for measuring inclination.
Measuring the height of a building with an inclinometer Triangulation today is used for many purposes, including surveying , navigation , metrology , astrometry , binocular vision , model rocketry and, in the military, the gun direction, the trajectory and distribution of fire power of weapons .
A geographic coordinate system (GCS) is a spherical or geodetic coordinate system for measuring and communicating positions directly on Earth as latitude and longitude. [1] It is the simplest, oldest and most widely used type of the various spatial reference systems that are in use, and forms the basis for most others.
In order to calculate the position line, the time of the sight must be known so that the celestial position i.e. the Greenwich Hour Angle (Celestial Longitude - measured in a westerly direction from Greenwich) and Declination (Celestial Latitude - measured north or south of the equational or celestial equator), of the observed celestial body is ...
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