The latest issues in simulating and analyzing differ- ent Earth Science phenomena require the development of complex algorithms, based on satellite images in different formats. The main goal of this paper is to process these data in a standard manner and to automatically publish the execution results by using the latest Web Processing Services (WPS). The development of these services needs to be slightly different when involving large volume of data processed over the Grid infrastructure opposed to standalone machines. This paper provides an implementation so- lution of the WPS standard within the GreenLand platform, and exemplifies it on the Black Sea catchment hydrologic modeling use case.