GRGS on-line tools to visualize and compare station coordinates time series of DORIS, GPS, SLR and VLBI sites.
GRGS provides tools to browse station coordinates time series provided by the GRGS Analysis Centers.
This service allows comparing time evolutions of coordinates for DORIS, GPS, SLR and VLBI sites.
The tools proposed by this web service are:
The time series
The time series are differences at observation epochs relative to a reference position (North, East and Up trended time series)
They are provided by:
CNES/CLS for DORIS
CNES/CLS for GNSS (NB: these GR2 series are NOT corrected for global translations/scale that can reach several cm. Contact igs-ac @ cls.fr for any question on the correct use of these series)
Observatoire de Paris/IMCCE for SLR (available soon)
Observatoire de Bordeaux for VLBI (available soon)
About the plot tool
The plot tool contains utilities for selecting charts to plot, displaying time series, editing data, changing plot appearance, specifying scaling, downloading data, plots and graph statistics in several formats. It is equipped with statistic tools for the calculation of mean, slope and weighted rms with respect to the slope (Weighted Relative Standard Deviation). Several series can be viewed and compared on the same graph. Additional data can also be displayed, such as station or satellite events. A help online is available too.
About the network viewer
The interactive global map visualizes the networks of the DORIS, GPS, SLR, VLBI sites analyzed by the GRGS Analysis Centers. It also helps in easily selecting sites stations for the time series plot tools, and getting access to site information. The time line at top of the map can be used to display the network over time.
About the data
Station coordinates time series are generated from STCD files. Satellite events are extracted from the list of the main events that occurred on the DORIS system elements with the exception of the station network. This list can be seen here. Station events are extracted from the list of the main events that occurred on the DORIS station network (new sites, new antennas, removed sites, failures...) with information on data gaps, invalidated data... This list can be seen here. Information about recent earthquakes close to DORIS sites are obtained from USGS survey service and added to the station events data available for the Plot tools.
The plot tools are based on the Highcharts/Highstock libraries.
The network viewer is an interactive global map application called Mapshup.
These applications may not work properly with Microsoft Internet Explorer. We recommend to use browsers such as Firefox or Google Chrome or Safari.