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True north refers to the geographical location of the north pole while magnetic north refers to the direction towards which the north pole of a magnetic object (as found in a compass) will point. The angular difference between true and magnetic north is called variation , which varies depending on location. [ 18 ]
PNG is a raster graphics format. PNG has advantages over SVG including smaller filesize (due to less-than-optimal server-side SVG-to-raster conversion), more widely supported and often easier and faster to make simple changes to things such as borders.
North arrows orient readers and tell them which way the map is facing. They are especially important in areas that map viewers are not familiar with, or when the map is oriented such that north is not up. In other cases, they may be unnecessary, especially when the geography is well-known. North arrows can be very complex or very simple. [14]
Description: an arrow showing to north (up) Source: Self-drawn in Inkscape, based on Image:Arrow northeast.svg; Date: 18:46, 2 May 2006 (UTC) Author: MarianSigler ; Permission: Puplic domain; Date: 2 May 2006 (original upload date) Source: No machine-readable source provided. Own work assumed (based on copyright claims). Author: No machine ...
On the topographic maps of the U.S. Geological Survey (USGS), for example, a diagram shows the relationship between magnetic north in the area concerned (with an arrow marked "MN") and true north (a vertical line with a five-pointed star at its top), with a label near the angle between the MN arrow and the vertical line, stating the size of the ...
The document (digital or paper) representing an orthophotomosaic with additional marginal information like a title, north arrow, scale bar and cartographical information is called an orthophotomap or image map. Often these maps show additional point, line or polygon layers (like a traditional map) on top of the orthophotomosaic.
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A modern military compass, with included sight device for aligning. A compass is a device that shows the cardinal directions used for navigation and geographic orientation. It commonly consists of a magnetized needle or other element, such as a compass card or compass rose, which can pivot to align itself with magnetic north.