1 [ESRI software] In ArcIMS, a service that uses the spatial server image rendering capabilities. When a request is received, a map is generated on the server, and the response is sent back as a JPG, PNG, or GIF image. A new map image is generated each time a client requests new information.
2 [ESRI software] In ArcGIS Image Server, a rendered image that users load from the server. The image service appears to the user as a virtual image. Some properties of a service may be defined by the client application.
3 [ESRI software] In ArcGIS Server, a type of Web service that is generated from image data.