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VTP stands for Virtual Terrain Project and is an open source terrain rendering, computing and storage system. It provides a complete set of tools and libraries for creating, editing, rendering and analyzing Digital Terrain Models (DTMs) and related geographic information data.
The file format of VTP adopts XML and binary forms. It can store various types of geographic information data such as elevation data, texture data, vector data, etc. It supports multi-layer representation of terrain, that is, each layer contains a specific type of data.
In addition to file formats, VTP also provides a series of visualization tools, such as OpenGL-based 3D rendering engines, DEM/DTM analysis tools, map editors, etc., to facilitate users to visualize terrain and Data Analysis operations.
DXF (Drawing Exchange Format) is an electronic drawing file format originally developed by AutoCAD and widely used. It is used to exchange and share 2D and 3D graphic data between different CAD (Computer Aided Design) software.
DXF files are in plain text format, which is readable and editable. It can store various types of graphic entities, such as points, lines, circles, polylines, polygons, arcs, text, and so on. In addition, DXF also supports storing metadata information such as layers, colors, linetypes, fonts, sizes, block definitions, and block references.
Due to DXF being an open file format, many CAD software supports importing and exporting DXF files. This enables the exchange of drawing data between different CAD software, facilitating collaboration and collaborative work between designers and engineers.
In DXF files, graphic data is saved in ASCII format and can be viewed and modified using a text editor. The structure of DXF files is clear and easy to parse and process. It is widely used in fields such as mechanical design, architectural design, and circuit design, becoming a universal data exchange standard between CAD software.