wms wfs wcs

wms：图片

A Web Map Service (WMS) is a standard protocol developed by the Open Geospatial Consortium in 1999 for serving georeferenced map images over the Internet.[1] These images are typically produced by a map server from data provided by a GIS database.
https://en.wikipedia.org/wiki/Web_Map_Service

wfs：矢量

In computing, the Open Geospatial Consortium Web Feature Service (WFS) Interface Standard provides an interface allowing requests for geographical features across the web using platform-independent calls. One can think of geographical features as the "source code" behind a map, whereas the WMS interface or online tiled mapping portals like Google Maps return only an image, which end-users cannot edit or spatially analyze. The XML-based GML furnishes the default payload-encoding for transporting geographic features, but other formats like shapefiles can also serve for transport. In early 2006 the OGC members approved the OpenGIS GML Simple Features Profile.[1] This profile is designed both to increase interoperability between WFS servers and to improve the ease of implementation of the WFS standard.
https://en.wikipedia.org/wiki/Web_Feature_Service

wcs：图片+数据、属性（有物理意义，高程、经纬度等）

The Open Geospatial Consortium Web Coverage Service Interface Standard (WCS) defines Web-based retrieval of coverages – that is, digital geospatial information representing space/time-varying phenomena.
https://en.wikipedia.org/wiki/Web_Coverage_Service
比如：多波段，请求对应波段组合，返回结果包含图片、波段组合、灰度值等