Planet Four Talk

Updates to Talk

  • mschwamb by mschwamb scientist, translator

    Hi,

    We were able to get some info about the HiRISE images added on the Talk pages (example APF00003oa) You should now see the North Azimuth, Sub Solar Azimuth, Phase Angle, and Emission Angle. The North Azimuth and Sub Solar Azimuth help you tell which way the sun is coming from. We will try and get a blog post out soon describing how to use these values.

    In the mean time, you can refer to this contents of this post on Talk by Michael for how to use Sub Solar Azimuth to figure out which way the Sun is coming from:

    Hey all, so here's how you figure out the sun direction in general. On
    the HiRISE image webpages all important observational parameters are
    given in that Observation toolbox. [note and now on Talk]

    Concerning the sun direction, we call that azimuth in astronomy (at
    least in some of the many coordinate systems possible), and the full
    name here is sub-solar azimuth, in other words, in what direction of
    the image is the point on the surface that lies directly under the
    sun, i.e. sub-solar.

    Now, first one needs to take the right angle for the image product of
    interest: both solar azimuths for map-projected and non-map-projected
    images are provided.

    Now, how to apply that angle: 0 is defined as a straight line to the
    right (= 3 o'clock), starting from the image center and increasing the
    angles clock-wise.

    In this example, looking at a non-map-projected image, the solar
    azimuth is given as 53.7 degrees, so starting from '3 o'clock, an
    angle of approx 54 degrees is the well-known lower right that we have
    in most of our images in Planet4.

    Cheers,

    ~Meg

    Posted

  • wassock by wassock moderator

    That's great Meg, at risk of seeming to want jam on it, could we get the solar longitude on there as well?

    Posted

  • Kitharode by Kitharode moderator

    Oh yeah. That's a winner. Well done team. (I'd also like some Ls jam on it please, better than those emissio-nangles). * 😉 *

    Posted

  • mschwamb by mschwamb scientist, translator

    Hiya,

    I can ask nicely, but the development team has lots of higher priority items on the todo list for new Zooniverse projects they've just launched or are building right now. There's no development time left for Planet Four so we're in maintenance mode, but because they are awesome they add things to Planet Four when there is a free moment, so no promises when this will get added. I can definitely ask, but I will let you know when it appears.

    Cheers,

    ~Meg

    Posted

  • mschwamb by mschwamb scientist, translator

    Hi,

    Actually looks like we don't always record that value. We switched codes that upload the images. We have the acquisition date of the image that we could add. Best we can do without updating the database and more work for the development team than we need to do right now.

    Cheers,

    ~Meg

    Posted