advantages and disadvantages of geographic coordinate system pdf Saturday, May 15, 2021 11:14:35 AM

Advantages And Disadvantages Of Geographic Coordinate System Pdf

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It rose to prominence when Google Maps adopted it in

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What are geographic coordinate systems?

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Geospatial data are stored in many different file formats. Each geographic information system GIS software package, and each version of these software packages, supports different formats. This is true for both vector and raster data. Although several of the more common file formats are summarized here, many other formats exist for use in various GIS programs. The most common vector file format is the shapefile A simple, nontopological, vector file format developed by ESRI to store the geometric location and attribute information of geographic features.

Web Mercator projection

A geographic information system , geographical information science , or geospatial information studies is a system designed to capture, store, manipulate, analyze, manage, and present all types of geographically referenced data. A GIS can be thought of as a system—it digitally creates and "manipulates" spatial areas that may be jurisdictional, purpose or application-oriented for which a specific GIS is developed. Hence, a GIS developed for an application, jurisdiction, enterprise or purpose may not be necessarily interoperable or compatible with a GIS that has been developed for some other application, jurisdiction, enterprise, or purpose. Therefore, in a general sense, the term describes any information system that integrates, stores, edits, analyzes, shares and displays geographic information for informing decision making. In , John Snow depicted a cholera outbreak in London using points to represent the locations of some individual cases, possibly the earliest use of the geographic method. While the basic elements of topography and theme existed previously in cartography, the John Snow map was unique, using cartographic methods not only to depict but also to analyze clusters of geographically-dependent phenomena for the first time. The early 20th century saw the development of photozincography, which allowed maps to be split into layers, for example one layer for vegetation and another for water.

Many types of map projections are being used for map making. They are basically classified into four groups in accordance with the Map Projection Theory or the types of surfaces that are tangent with the globe. The four categories are: - Planar, Azimuthal or Zenithal projection - Conic projection - Cylindrical projection - Mathematical or Conventional projection obtained from mathematical calculation. The Gnomonic projection has its origin of light at the center of the globe. Less than half of the sphere can be projected onto a finite map. It displays all the large circles as straight lines, and parallels as curved lines.


advantages and disadvantages of each method. Then the Dictionary terms: A coordinate system is a system of assigning to each point in a certain region a.


Types of Map Projections

A geographic coordinate system GCS uses a three-dimensional spherical surface to define locations on the earth. A GCS includes an angular unit of measure, a prime meridian, and a datum based on a spheroid. A point is referenced by its longitude and latitude values. Longitude and latitude are angles measured from the earth's center to a point on the earth's surface. The angles often are measured in degrees or in grads.

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Geographic vs Projected Coordinate Systems

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