Question: How long has satellite data been available?
About the article "Climate change", section "Precipitation".

Candidate passages:
Although scientists have been studying marine animals that perform natal homing for years, they are still not positive that geomagnetic imprinting and chemical cues are the only navigational tools they use for their incredible migrations.
There is still much more research to be done until scientists can fully understand how these animals can travel such great distances to reproduce.
Fortunately as technology has progressed there are several tools available to scientists now such as data loggers equipped with magnetometers that can easily be attached to the animals.
Not only do they give data showing the animal relative to the Earth's magnetic field but some also give latitude based on this, longitude based on light levels, temperature, depth, etc.
Pop-up satellite archival tag are used to gather data and have the ability to transfer this data via Argos System satellites to the scientist. 
PERSIANN, "Precipitation Estimation from Remotely Sensed Information using Artificial Neural Networks", is a satellite-based precipitation retrieval algorithm that provides near real-time rainfall information.
The algorithm uses infrared (IR) satellite data from global geosynchronous satellites as the primary source of precipitation information.
Precipitation from IR images is based on statistical relationship between cloud top temperature and precipitation rates.
The IR-based precipitation estimates are then calibrated using satellite microwave data available from low Earth orbit satellites (e.g., Tropical Rainfall Measuring Mission Microwave Imager, Special Sensor Microwave Imager, Advanced Microwave Scanning Radiometer‐Earth observing system).
The calibration technique relies on an adaptive training algorithm that updates the retrieval parameters when microwave observations become available (approximately at 3 hours intervals).
The PERSIANN satellite precipitation data sets have been validated with ground-based observations and other satellite data products.
The PERSIANN data has been used in a wide variety of studies including hydrologic modeling, drought monitoring, soil moisture analysis, and flood forecasting.
The PERSIANN data are freely available to the public. 
Satellite television has been available in Indonesia since Indovision incorporated on 8 August 1988 and officially launched on 16 January 1994.
Since then, technology for satellite television has changed from analogue to digital.
Satellite television in Indonesia using digital video broadcasting-satellite format.
Up to now, there are more than five satellite pay TV operators: Indovision, TOP TV, TelkomVision, Yes TV, Aora TV and OkeVision.
Satellite television is available nationwide. 
Data Retrieval.
Argos.GPS tracking devices have been linked to an Argos Platform Transmitter Terminal (PTT) enabling them to transmit data via the Argos System, a scientific satellite system which has been in use since 1978.
Users can download their data directly from Argos via telnet and process the raw data to extract their transmitted information.
Where satellite uplink fails due to antenna damage, it may be possible to intercept the underpowered transmission locally using a satellite uplink receiver. 
Daily global, hemispheric and zonal data are available.
Monthly averages are available in gridded format as well as by hemisphere and globally.
Each set has data back to December 1978.