![]() The projected coordinate system is always based on the geographic coordinate system, while the latter is based on a sphere or spheroid. Unlike the geographic coordinate system, the length, angle, and area of the projected coordinate system are constant within the two-dimensional space. PCS is defined in a two-dimensional plane. GCS uses a three-dimensional sphere to define a position on the earth. or Robinson and other map projections, these map projections (and many other map projection models) provide various mechanisms to project the map of the earth sphere onto the two-dimensional flute. Based on the projection coordinate system of the horizontal axis Mercator, Albus, etc.These coordinate systems are often called geographic coordinate systems (GCS). Global coordinate system or spherical coordinate system, such as latitude and longitude.Two commonly used coordinate system types are generally used in GIS: The maps we usually see are two-dimensional, and the earth is an ellipsoid, so we need to convert the representation on the ellipsoid into a two-dimensional plane in some way. The first thing to consider is the coordinate system. Opendrive map how to#The following describes how to construct a road network based on the data in the OpenDRIVE file. Read OpenDRIVE files, that is, map data, construct a road network, and display it to users through rendering. The following figure is a simple idea of drawing a map. The following figure is the main structure of the xml file. The xml file contains a lot of map information, such as Road, Junction, etc. For detailed introduction, please refer to ![]()
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