What is in databases
    Click here for data description
    SPIDR Installation Guide
    SPIDR User's Guide
    SPIDR Web-services Guide
How to work with data
    New SPIDR user
    Advanced SPIDR user
How to use the pages
    Select data set
    Data query
    Time series plot
    User data basket
    Time interval & sampling
    DMSP orbits search
    DMSP orbits viewer

SPIDR Time Series Plots


    Time series plotting page is used for preliminary data visualization in SPIDR before the order and for visual data mining and quality control.

    Usage basics

    The time series plots are built dynamically by server upon the user request. The selected data can be plotted by SPIDR anonymous and registered users from the "Detailed Data Set Request" and "User Data Basket" pages, and by SPIDR administrators from the "Data Administrator Home" page when uploading new data files to SPIDR.

    To plot the time series, the date interval and time step have to be selected. If the date interval is not set, the SPIDR server will automatically redirect the user to the SPIDR "Time Interval and Sampling" page to set the values, and after that the time series plotting will resume.

    Changing date interval and time step at the from the "Time Series Plots" page using link at the left SPIDR menu will return the user back to the time series plotted for the changed date interval and time step.

    SPIDR can plot time series either with static GIF images or with dynamic Java applets.

    Plotting with GIF images

    To plot the time series as GIF images, the user has to select the corresponding action in the "Next action" list at the bottom of the page and to confirm the choice with the button "GO".

    The GIF images of the plots will be built dynamically by server and sent to the user browser as image files, which can be easily saved on the user workstation or copied into the user document.

    Plotting with Java applet(s)

    To plot the time series with Java applet(s), the user has to select the corresponding action in the "Next action" list at the bottom of the page and to confirm the choice with the button "GO".

    When plotting with Java applets, it is possibly to zoom into any part of the time series by dragging a rectangle around the interesting region on the plot. This allows to see more details on the plot and to change time scale without server call for re-sampling. To cancel the zoom function and to reset the plot to the original size the button "zoom out" is used.

    At the page with several plot windows zoom into any of the plots synchronizes time axis with other Java applets. It means that at any moment time windows on all the plots at the page are the same. The "zoom out" button at any of the plots cancels the zoom function for all of them.

    To use time series plots with Java applets, the Java run time environment should be installed on the user?s workstation.
    If the Java is not installed, the user should switch back to the GIF time series plotting.