Coastline Watch aims to assess the best practices to continuously monitor changes caused by natural processes (such as waves, tides and currents) and strengthen by human intervention or global climate changes. The current solution processes coastal information from Satellite open data for monitoring and makes insitu measurements using Unmanned Aerial Vehicles (UAV) for impact analysis. It uses a collaborative infrastructure to make processing requests, analyze and share the resulting outcomes with a project team. The first experimental processing service implements a shoreline monitoring chain to detect changes, to establish trends and indicators and to identify potential risks and critical areas. The service uses Landsat program data and it is prepared to support other open or commercial satellites, such as the Sentinel program. After identifying critical areas, the solution uses a methodology to determine impact of changes by making aerial data acquisitions and then estimating surface volumes changes. A cloud infrastructure, based on Amazon AWS technology, provides a distributed environment solution composed by a web portal, processing resources and an OGC database. The portal allows the users to generate new coastal products based on automated scripts, to share the results with the team and to view/download the final products. The service is being demonstrated on the coastal areas of Figueira da Foz and Óbidos lagoon over specific timeframes, being iteratively fine-tuned with users/researchers feedback. The current infrastructure is still under consolidation, with the final goal to provide automated processing tools and a methodology that could be collaboratively and continuously updated by researchers and professionals to generate data from new areas and update existing ones.