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**CSW **is an OGC-standardized Web service protocol used to publish, discover, and access metadata of geospatial data and services. It supports searches based on keywords, geographic location, and other conditions through HTTP requests.

OGC API - Features is one of the next generation Web API specifications developed by the OGC (Open Geospatial Consortium), the international standardization organization for geospatial information, to standardize the access and operation of vector data (features). It is a modernized specification of the traditional WFS (Web Feature Service), and its RESTful structure and lightweight JSON-based data format make it highly compatible with the Web and cloud environments, making it very suitable for integration into mobile and Web applications.

Sentinel Hub is a cloud API platform for satellite imagery operated by the European Space Agency (ESA). It supports the Sentinel series of satellites (such as Sentinel-1, Sentinel-2, Sentinel-3, etc.), as well as other data sources such as Landsat and MODIS. The platform uses APIs to enhance access to satellite data. Users can process data of interest through its APIs and access these data in the required format to obtain analysis-ready data (ARD) without additional cleanup. Sentinel Hub provides functions such as EO Browser (interactive visualization tool) and Custom Script (JavaScript-based API, which can customize algorithms for batch processing of data), supports OGC services (such as WMS/WMTS/WCS protocols), and can be integrated into GIS software (such as QGIS).

Google Maps API is a service provided by Google that integrates online maps and geospatial data. It allows map functions to be embedded in websites and mobile applications, and is a powerful developer tool that can be used to display geographic information in a visual and interactive way.