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LocationIQ API is a cloud-based web API service for searching, converting, and visualizing geospatial data. It primarily provides functions such as geocoding (address → coordinate conversion), reverse geocoding (coordinate → address conversion), map tile delivery, routing, and location search. Built on OpenStreetMap (OSM) data, it is characterized by its ability to build high-precision, low-cost location-based services. With its lightweight and simple REST API design, it integrates easily into web and mobile applications, making it suitable for developing a variety of location-based services.

Geoapify Maps & Location API is a cloud-based geolocation service that provides functionalities such as map display, geocoding, routing, and place search. Built on OpenStreetMap data, it is designed to enable developers to easily integrate mapping features into web and mobile applications. With its flexible API design and simple authentication method, it supports the development of a wide range of location-based applications and is used as a scalable platform suitable for commercial use.

Thunderforest Maps API is a collective term for the map delivery services provided by Thunderforest, offering an API that allows for the rapid integration of high-quality maps into web and mobile applications. It is accessed using an API key and provides multiple services, including standard map style delivery, raster tiles, static maps, vector styles, and vector sources. It features map styles such as OpenCycleMap, Transport, Landscape, Outdoors, and Atlas, and is easy to integrate with existing map libraries.

Stadia Maps API is a cloud-based map service API for delivering map tiles and geospatial data. By using this API, developers can easily integrate high-quality map display functionality into websites and mobile applications. Stadia Maps is characterized by its ability to deliver both vector and raster tiles, providing fast distribution of map styles based on open data such as OpenStreetMap. It is also compatible with common map libraries, enabling flexible customization and high-performance map rendering. With its lightweight and scalable cloud infrastructure, it plays an important role in the development of geospatial applications.

Putnins P6 Projection is a pseudoconic equal-area projection proposed by Soviet geographer A. Putnins in the mid-20th century. Designed specifically for world maps, it aims to accurately preserve the area relationships between land and ocean. In this projection, the Earth’s graticule is projected onto a conical surface and then unfolded into a plane, resulting in meridians represented by straight lines radiating from a common vertex and parallels as concentric circular arcs centered at that vertex. Distortion is minimized near the standard parallels and increases with distance from them, yet area distortion remains zero throughout.

OpenMapTiles Server is open-source map server software for delivering vector map tiles. Developed by the OpenMapTiles project, it enables high-speed distribution of vector tiles (in Mapbox Vector Tile format) generated from geospatial data such as OpenStreetMap (OSM). It can be easily deployed in local server or cloud environments, and by combining it with web mapping libraries such as MapLibre GL, Mapbox GL JS, and Leaflet, high-performance interactive mapping applications can be built. OpenMapTiles Server is equipped with features such as tile caching, style management, and API delivery, and is widely used as a foundation for operating custom map services.

MapLibre Services (MapLibre GL + self-hosted service ecosystem) is a geospatial service platform built around MapLibre GL, an open-source map rendering library. Originally derived from the open-source version of Mapbox GL JS, this project enables high-speed vector map rendering, custom style display, and the development of interactive mapping applications. MapLibre Services is characterized by its ability to operate functions such as tile delivery, style management, geocoding, and routing on self-managed servers, allowing for flexible map service construction while avoiding cloud dependency. This enables enterprises and research institutions to securely manage their own geospatial data while developing advanced web mapping applications.

Putnins P5 Projection is a mathematical method in map projections, belonging to the pseudocylindrical projection category. It is primarily used to transform the Earth's three-dimensional surface into a two-dimensional plane in a specific manner, balancing distortions in area, shape, or angle. It is suitable for thematic mapmaking and the visualization of geographic information for specific regions.

Putnins P4 Projection is a pseudocylindrical projection that maintains approximate accuracy in area proportions to balance map distortion, making it suitable for mapping mid-scale regions. This projection compresses distortion in polar areas while generally achieving a compromise between shape and area representation, positioning it as a balanced solution among pseudocylindrical projections.

Putnins P2 Projection is a pseudocylindrical equal-area map projection proposed by R. V. Putnins in 1934, primarily used for creating thematic world maps. This projection employs a specific mathematical method to transform the curved geometric features of the Earth onto a plane. It is characterized by a central meridian that is a straight line with a length half that of the equator, and parallels that are straight lines parallel to the equator, with spacing decreasing as latitude increases. There is no distortion along the central meridian or at latitudes 36°46′ N/S, but distortion gradually increases farther away from these areas.