Time series	Initiatives	Events
2005	GEOSS initiative	Interconnecting existing and future Earth observation systems.
		Reduces costs, promotes international cooperation and serves the public good.
		One user may require many data sets, while one data set may serve many users.
2004-2013	EO Open-data initiatives (INPE/NASA/ESA)	INPE becomes a pioneer by making CBERS-2 images available free of charge from 2004.
		In 2008, the USGS adopted a free and open Landsat data policy which led to a substantial increase in the use of Landsat data.
		ESA’s Sentinel-2 data product become publicly available at no cost through accessible web portals.
Last decade (2nd millennium)	Commercial microsatellite constellations	Planet Labs Inc. operates a constellation of more than 100 cubes (doves) to capture daily high-resolution images (3 - 5 m).
		The TripleSat/DMC3 Constellation successfully launched in 2015 which makes it possible to target anywhere on earth once per day.
	Rockets Reuse	Launching multiple satellites from one mission, and the use of low orbit in the constellations of the satellites.
		Rocket reuse by Space X in 2017, with the possibility of simultaneously launching many satellites.
	Spatial Data Infrastructure (SDI) Developments.	Functionalities for big EO data management, storage and access.
		Provide a more complete solution for big EO data management and analysis by integrating different kinds of technologies.
		Application Programming Interfaces (API) and web services.
	Harmonized Landsat 8 and Sentinel-2 (HLS)	Global observations of the land every 2-3 days at moderate (<30 m) spatial resolution.
		Uses a set of algorithms to obtain seamless products from OLI and MSI: atmospheric correction, cloud and cloud-shadow masking, spatial co-registration and common gridding, illumination and view angle normalization and spectral band pass adjustment.