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The Research of the Standard Parallel Solution About Chart Based Data
Pages: 55-58
Year: Issue:  4
Journal: Hydrographic Surveying and Charting

Keyword:  chartingMercator projectionstandard parallellength deformationdatabase;
Abstract: Mercator is one of the most common projection in marine charting,in which there is no length deformation on the standard parallel.However,the length deformation is very large in the fields away from the standard parallel.When compiling chart based data,the length of the field corresponding to the cartographic generalization parameters affected by Mercator projection is very significant.And these will affect the density and accuracy of chart datain different latitude locations.In order to make the features in uniform density and control data error,this article analyzes the influence on difference between chart showing and real distance caused by the different standard parallel and the length deformation of different fields.According to this to set cartographic generalization parameters.And based on the principle of control the length deformation,the article makes the standard parallel solution about chart based data when building marine geographical database.
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