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GXT / MapInfo Custom Coordinate System File is a text-based format used in MapInfo Professional to define custom map projections, coordinate systems, and datum transformations. Managed as part of MapInfo's spatial data management ecosystem, it enables users to extend beyond predefined coordinate systems by creating custom definitions tailored to specific local surveying needs, specialized datasets, or regional mapping requirements. It serves as an essential configuration tool for ensuring spatial data aligns correctly across different maps and layers.

Geocodio API is a geocoding service API primarily used to convert addresses into latitude and longitude coordinates (geocoding) or convert latitude and longitude coordinates into addresses (reverse geocoding). It supports various programming languages through HTTP requests and returns data in JSON or XML formats, widely used in map applications, location services, data analysis, and other scenarios.

CADRG (Compressed ARC Digitized Raster Graphics) is an abbreviation for "Compressed ARC Digitized Raster Graphics," primarily used for storing and transmitting raster images in geospatial data. It is commonly employed in military and surveying fields. This format optimizes data storage efficiency through compression technology and supports high-precision digital representation of geographic information, typically requiring professional software for import and processing. In GIS applications, CADRG format often needs to be converted to a file geodatabase raster to improve subsequent analysis efficiency.

SAIF (Spatial Archive and Interchange Format) is an open geographic data standard developed under the leadership of the Canadian government. It uses an object-oriented multiple inheritance model to build a standardized framework containing more than 300 basic classes. It realizes one-to-many data conversion and interoperability across GIS platforms and database systems through the SAIF/ZIP compression mechanism, providing a unified intermediate exchange format for multi-source heterogeneous geographic spatial data. It is particularly suitable for cross-platform data sharing scenarios that require compatibility with multiple commercial software and databases.

OpenRouteService API is an application programming interface (API) that provides route planning, navigation, and geocoding services. It supports multiple transportation modes (such as walking, cycling, driving, etc.) and can be integrated into map applications to enable route calculation and navigation functionality. Through its open interface, it offers location-based services for developers, making it suitable for application development requiring route optimization or navigation features.

SXF (Russian State Surveying Format) is a proprietary format used by the Russian Federation to store and process geospatial data. It is primarily used in national surveying and mapping projects, such as topographic maps and cadastral surveys. This format supports structured storage of both vector and raster data, including coordinate systems and attribute tables, and complies with Russian national surveying and mapping standards. Designed to balance data accuracy and localization requirements, it is commonly used by government surveying and mapping agencies and related professional software.

TER (Terragen Terrain File) is a proprietary terrain data file format used by the natural terrain generation software Terragen. Primarily designed for storing elevation information (heightmaps), it aims to represent realistic landforms such as mountains, hills, and valleys with high precision. While the TER format has been widely used in terrain modeling and the CG/VFX fields for its emphasis on visual realism, it is often treated as a supplementary or conversion format in the GIS domain.

USGS DEM is an open DEM data format standard defined by the United States Geological Survey (USGS). It uses ASCII code for storage and consists of three logical records: A (file header), B (section data), and C (precision information). Each logical record unit is fixed at 1024 bytes. This format supports both UTM projection and geographic coordinate (seconds) grid types, and the data range covers a variety of geographic grid products, including 7.5 minutes, 30 minutes, and 1 degree. Its files can be directly read and converted to common raster formats using tools such as ArcGIS. The GDAL library natively supports parsing and can automatically identify coordinate systems and elevation units (meters/feet).

DEM (Digital Elevation Model) is a universal terrain data format and concept that represents ground surface elevation in a grid-based (raster) numerical form. Each grid cell stores a corresponding elevation value, enabling quantitative analysis of terrain undulation and shape. As a vendor-neutral general-purpose format, DEM is widely used and regarded as a fundamental and essential spatial dataset across various fields, including terrain analysis, cartography, simulation, disaster prevention, and environmental analysis.

FlatGeobuf is a high-performance binary-encoded vector geographic data format designed for processing large-scale static geographic data. It utilizes FlatBuffers technology for compact storage and fast read/write speeds. It features a built-in Packed Hilbert R-Tree spatial index and supports streaming and on-demand loading, significantly improving network transmission efficiency and rendering speed. It is particularly well-suited for scenarios requiring efficient processing of massive amounts of geospatial data. As an open-source format, FlatGeobuf is compatible with mainstream tools such as GDAL, QGIS, and GeoServer, and supports multi-language implementations, making it an ideal alternative to traditional Shapefiles and GeoJSON.