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STYL files are the file format used by the Stylus preprocessor, which is a CSS preprocessor designed to improve the readability and maintainability of CSS. It uses a more concise and flexible syntax, supports indented syntax, omits symbols such as braces and semicolons, and makes style sheets clearer and easier to write. STYL files usually have a “.styl” file extension.

SBX (Shapefile Index (.sbx)) is an index file used in GIS (Geographic Information System) to improve the access speed of Shapefile (vector data storage format) data. It is a common vector data format used to store geospatial data. It consists of multiple files, including .shp, .shx and .dbf files. Among them, the .shx file is the SBX file, which stores the offset and length information of each geometric object in the .shp file in binary format.

LYR files are a special file format used in Esri ArcGIS software to save layer-related information, usually with a .lyr extension. It does not directly store geographic data, but records information such as the layer’s style, rendering rules, data source path, and display configuration. The main function of LYR files is to associate complex map symbolization, display settings, and data, so that users can quickly apply consistent layer styles in different projects or scenes. In ArcGIS Pro, the function of LYR files is further expanded to LYRX files (ArcGIS Pro layer files), which are compatible with more modern GIS data formats and functions.

**SIRGAS 2000 **is a geocentric reference frame for Central and South America, which aims to define and implement a unified reference frame for Central and South America that is consistent with ITRF. Its ellipsoid adopts GRS 1980, with a major semi-axis of 6378137 meters, an oblateness of 298.257222101, the Greenwich meridian as the prime meridian, and the angle unit is degree. SIRGAS 2000 was established in 2000, consistent with the ITRF2000 framework, with a reference epoch of 2000.0. It is a regional encryption of ITRS in South America, achieved through a network of about 200 continuously operating stations (SIRGAS-CON) throughout Latin America and the Caribbean.

VDC (Virtual Design and Construction) is a technology and methodology used in the fields of architecture, engineering and construction (AEC). It combines building information modeling (BIM), 3D visualization and other digital tools to perform virtual simulation and management during the design, planning and construction stages of a project. By digitizing the construction process of the entire project, VDC can optimize collaboration, improve efficiency and reduce risks, thereby increasing the success rate and profitability of the project.

IND (Interchange of Navigational Data) is a data exchange format used in the field of navigation and is also a data format in GIS. IND files usually contain nautical charts and navigation-related data, such as routes, ship positions, port information, navigation marks, etc.

**VCT **(Vector Product Format) is a vector data format commonly used in geographic information systems (GIS) and spatial data management. The format is designed to support data storage and exchange of complex geographic objects and provide efficient spatial data processing and application. The VCT format has attracted widespread attention for its flexibility and efficient storage structure, especially in scenarios where large amounts of spatial data need to be quickly queried and processed.

**ECW **(Enhanced Compression Wavelet) is an image compression format designed to efficiently compress and store large-scale raster image data, especially for remote sensing images and map data. The ECW format compresses image data using wavelet transform technology to reduce the volume of data while maintaining image quality as much as possible. The ECW file format was developed by Earth Resource Mapping (now Hexagon Geospatial) and is widely used in geographic information systems (GIS) and remote sensing fields.

**DWF (Design Web Format) **is a file format developed by Autodesk for distributing and sharing design drawings and 3D models.

In GIS (Geographic Information System), ID files usually refer to identification files, which are files used to identify data sets. They usually contain metadata information such as the name, version, author, format, creation date, scope, and summary of the data set to help users understand and manage the data set. The format of the ID file can be a text file, XML file, or other structured format. In GIS, the metadata information of the data is very important, which can help users better understand the data set, evaluate data quality, and select appropriate data and analysis methods. Therefore, the ID file is also very important.