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An opisometer, also called a curvimeter, meilograph, or map measurer, is an instrument for measuring the lengths of arbitrary curved lines. Explanation [ edit ]
The purpose of the project is to aggregate and make digital maps and related GIS data available for free. Licensing: CC-BY-SA 2.0 GPSies.com: Google Maps tool: Gives coordinates for places, names, elevation/height above sea level on Google Maps (reverse geocoding).
"The Generic Mapping Tools". generic-mapping-tools.org. 2021-02-15 "planiglobe - online vector map creation". Kiel, Germany: kk+w - digitale kartografie GmbH. September 2, 2008. Archived from the original on February 4, 2012 Interactive online map generation using GMT. Phillips, Doug (September 11, 2003).
Online maps can be basically divided by the covered area (global or local) and by the representation of this area (classic drawn or orthophoto). Global online maps [ edit ] These maps cover the world, but may have insufficient details in some areas.
Formulas for the Web Mercator are fundamentally the same as for the standard spherical Mercator, but before applying zoom, the "world coordinates" are adjusted such that the upper left corner is (0, 0) and the lower right corner is ( , ): [7] = ⌊ (+) ⌋ = ⌊ ( [ (+)]) ⌋ where is the longitude in radians and is geodetic latitude in radians.
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Measure Map Pro format (MMP) is an XML notation to store GIS information in two-dimensional or three-dimensional maps. It was created by Blue Blink One to store information about Polygons, Polylines and Spots including georeferenced labelling, grids and comments.