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  1. GMAT
  2. GMT-5420

Tutorial one Earth Rotation and Ground Track

    Details

    • Type: Bug
    • Status: Closed (View Workflow)
    • Priority: Blocker
    • Resolution: Won't Fix
    • Affects Version/s: R2015a
    • Fix Version/s: None
    • Component/s: Orbit View (FRR-28)
    • Labels:
      None

      Description

      When you build and run the scenario as described in Tutorial One, you find that the earth rotates at varying rates-it slows down and comes to a halt--before the end of the scenario, and the end of the satellites motion.

      This results in a ground track that is not representative of reality.

        Gliffy Diagrams

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            Hide
            Alex Jehle Alex Jehle added a comment -

            After looking closer at the simulation as it runs---the time scale in tutorial one is not constant.

            The issue is not a bug.

            Recommend that the default time be constant to avoid confusion.

            Show
            Alex Jehle Alex Jehle added a comment - After looking closer at the simulation as it runs---the time scale in tutorial one is not constant. The issue is not a bug. Recommend that the default time be constant to avoid confusion.
            Hide
            shughes Steven Hughes added a comment -

            There is a trade off between using adaptive stepping which provides significant performance improvements, and fixed step, which will make dynamic graphics a bit more intuitive. It's pretty subjective which is better, but I lean towards having defaults configured for reasonable performance and accuracy. It's easy for users to change these for their application.

            Show
            shughes Steven Hughes added a comment - There is a trade off between using adaptive stepping which provides significant performance improvements, and fixed step, which will make dynamic graphics a bit more intuitive. It's pretty subjective which is better, but I lean towards having defaults configured for reasonable performance and accuracy. It's easy for users to change these for their application.
            Hide
            jamesarosen James A Rosen added a comment -

            Could this be an opportunity to introduce the user to the adaptive stepping feature? For example, we could pop up a little notice part-way through the simulation to tell the user what the feature is, why it exists, and how to toggle the time scale.

            Show
            jamesarosen James A Rosen added a comment - Could this be an opportunity to introduce the user to the adaptive stepping feature? For example, we could pop up a little notice part-way through the simulation to tell the user what the feature is, why it exists, and how to toggle the time scale.
            Hide
            shughes Steven Hughes added a comment -

            CCB: Adding a pop-up window, while useful for beginners, will soon annoy those familiar with the system and would require additional infrastructure to manage whether pop-ups will be shown after the first time. There are too many other critical needs to address this at this time.

            Show
            shughes Steven Hughes added a comment - CCB: Adding a pop-up window, while useful for beginners, will soon annoy those familiar with the system and would require additional infrastructure to manage whether pop-ups will be shown after the first time. There are too many other critical needs to address this at this time.

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                Dates

                • Created:
                  Updated:
                  Resolved: