![]() Projection coordinate system is always based on geographic coordinate system, The latter is based on a sphere or a rotating ellipsoid. Different from geographic coordinate system, In 2D space, Length of projection coordinate system 、 Constant angle and area. GCS Use a three-dimensional sphere to define the position on the earth. Based on horizontal axis Mercator 、 The projection coordinate system of map projection of Arbus isoproduct or Robinson et al, These maps project ( And many other map projection models ) Provides various mechanisms to project a map of the earth's sphere onto a two-dimensional Cartesian coordinate plane.These coordinate systems are often called geographic coordinate systems (GCS). Global or spherical coordinates, For example, longitude and latitude.Stay GIS Two common types of coordinate systems are commonly used in : The first thing to consider is the coordinate system, The maps we usually see are two-dimensional, And the earth is an ellipsoid, So we need to transform the representation on the ellipsoid into a two-dimensional plane in some way. #OPENDRIVE MAP HOW TO#Let's combine OpenDRIVE The data in the file, Introduce how to construct road network. Here's a simple idea for mapping, Read OpenDRIVE file, Map data, Construct the road network, Display to users through rendering. , The picture below is xml The main structure of the document , The xml The file contains a lot of map information, for example Road、Junction etc. OpenDrive The map file format is xml, For detailed introduction, please refer to OpenDrive Map parsing code can refer to, ![]()
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