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



    Usage basics

    This page is used to pre-view and to navigate through a set of the DMSP orbits found in the orbital database for the given date interval, location, daytime and satellite(s).

    The viewer displays metadata, two images 1/8th of the orbit in visible and thermal infrared optical bands, geolocation for the orbit segment.

    The user can navigate through the set of all orbits found after request using either time conrols (VCR style) panel, or orbital navigation "joystick".

    Time controls panel

    The first orbital segment displayed after the viewer page is loaded into the user's web browser belongs to the first orbit found in the date interval given by search request. To see other orbits found by the search in the observation time order, the user can use the VCR-style buttons from the time control panel on the viewer page.

    The image preview can be animated to display orbits as slide show with small time delay.

    The "Play" button is used to start the animation.

    The "Stop" button to stop animation at any orbit.

    Orbital navigation "joystick"

    The orbital navigation joystick is located in the left section of the DMSP viewer above the 1/8th orbit segment geolocation map. The map shows the swaf of the orbit and direction of the satellite flight.

    Using the joystick controls, the user can shift to the next or to the previous 1/8th segment of the current orbit (say, orbit N) or to the same segment (the same latitude range) of the next (N+1) or previous (N-1) orbit. The shift operations can be repeated several times, allowing the user to "fly" along the satellite trace. To return back to the orbital segment from which the navigation has started, the "Reset" button is used.


    The orbital navigation is performed for one satellite at a time, depending from which satellite orbit segment it has started.