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XML (Extensible Markup Language) is a markup language used to describe and store structured data. Its tag structure is similar to HTML, but its purpose is specifically for expressing and exchanging data, and users can define their own tags. It is mainly used for data integration between systems, setting files, configuration information, etc.

GeoPackage is a lightweight, high-performance geospatial information exchange and storage format standardized by the Open Geospatial Consortium (OGC). Unlike traditional multi-file formats such as Shapefile or GeoTIFF, GeoPackage stores all spatial and attribute data in a single SQLite database file (.gpkg extension). GeoPackage is designed for mobile devices and web applications, and is particularly suitable for environments with limited storage capacity and performance.

PCIDSK (PCI Geomatics Database File) is a geospatial data file format developed by PCI Geomatics of Canada, mainly used in the fields of remote sensing and geographic information systems (GIS). The format uses a database-like structure that can store vector and raster data in a single file and is known for its high compatibility with the PCI Geomatics product “Geomatica” software.

**MVT **(MapBox Vector Tile) is a map vector tile format developed and launched by Mapbox. It uses vector data slicing and compression technology to cut geographic data into small vector tiles for fast loading and rendering in web maps and mobile applications.

**AUX file (Auxiliary File) **is a file used in GIS (Geographic Information System) to store auxiliary information (such as spatial index, attribute index, metadata, etc.) of geographic datasets, aiming to improve the efficiency of spatial query and analysis.

In the GIS field, WN files usually refer to Work Network Files, which are used to store linear network data (such as roads, rivers, pipelines, etc.) in GIS, and contain structured information such as nodes (NOD), lines (LIN) and networks (NET).

MPJ files are project file formats used by MapInfo Professional to manage project information related to Geographic Information Systems (GIS). The file itself does not store geographic data, but contains reference information for multiple data files and layers associated with the project. MPJ is mainly used to save project settings and configuration information, including map display status, data source path, layer structure, and style settings. Therefore, MPJ files play an important role in reproducing the visualization and editing of geographic data.

TFW file (TIFF World File) is a text file used in GIS to store geographic reference information of TIFF format raster images. It defines the mapping relationship between pixel coordinates and geographic coordinates through affine transformation parameters. is a text file used in GIS to store geographic reference information of TIFF format raster images. It defines the mapping relationship between pixel coordinates and geographic coordinates through affine transformation parameters.

FBN file is a format used for visualization and management of 3D models and geospatial data, mainly suitable for the management and display of large-scale 3D scenes and city models. This format is optimized to efficiently load and render large volumes of data, and is widely used in fields such as GIS (Geographic Information System) and digital twins. FBN files can package and store model data, texture information, geographic coordinates, attribute data, etc., so that high-speed rendering can be achieved while maintaining 3D scene reproducibility and data consistency.

BMP file (bitmap file, extension: .bmp) is a file format for storing bitmap images, developed by Microsoft. It is widely used as a standard image format in Windows environment, mainly used to process uncompressed raster images. Since BMP files store each pixel data of the image as it is, they can display high-quality and lossless images, but the file size is often large.