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Re: Feedback on indoor geocaching game

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Hola Ravi,
Sorry it took me a while to reply to this... I am not sure I fully understand the diagram, but it seems you highlight two very important things:
1. Annotations are sufficient for providing routing and navigation services. Thus, we don't need to track blueprint coordinates as long as we can 'pull' users towards the closest annotation (tag), and similarly, 'pull' the destination towards a pre-defined tag, and
2. Mapping (the process of annotating) can, and perhaps even should, be done away from the actual place. The reason I say 'should' is because in order to provide some meaningful service like routing, we need to be able to constrain the problem and this can be more easily done if we de-couple mapping from fingerprinting so that fingerprinting becomes the process of associating fingerprints to a map that has already been defined. This is not unlike current geographic information systems, so we should really try to take advantage of open GIS tools when figuring out how to map locations. 

hope this helps!

Jorge

On 11-04-21 08:01 AM, Ravi Agarwal wrote:

For the navigation problem-
The localization and object annotation information from our app can be
fed as input into a plan recognition module. Once the resultant goal is
identified based on user location and preference, it is translated into
a pre-defined objective to the path planner which computes the resultant
path and communicates the navigational information to the user (See the
attached flowchart).


On Wed, Apr 20, 2011 at 11:52 PM, yibin <wapprentice@xxxxxxxxx
<mailto:wapprentice@xxxxxxxxx>> wrote:

    For the idea of room finder application, one thing to notice is that
    some APs actually have energy preservation feature (and I think it
    will become more and more popular) which allows AP dynamically
    adjust RSSI by load. Some more sophisticated machine learning
    technique is needed to counter this time variant fingerprint value.
    The room finder is the kind of application requires most accuracy
    and needs not just positioning but also direction guidance (which
    maybe could be done using gradient descend of RSSI of the landmark
    APs ?).

    Bests,
    Yibin


    On 2011/4/18 13:54, Jorge Silva wrote:

        Hola Ravi,

          See my answers below...

        cheers!
        Jorge

        On 11-04-15 02:14 PM, Ravi Agarwal wrote:

            Dear Dr.Jorge,

            I talked to my friend Venkatesh here about the project and
            the final
            goal we are trying to achieve. He is visually impaired and uses
            assistive technologies for operating computer etc. I got a
            wonderful
            feedback from him. He is excited to use the technology and
            thinks that
            it will be very useful. He also said that if this was
            implemented
            universally, like it can be made compulsory for some
            buildings to have a
            Wifi network and tagged fingerprints stored so that one
            could easily
            navigate room to room.

        Great! we are indeed trying out different approaches to making
        sure this becomes widely available... I think the best
        approaches will be those that offer value to people with
        blindness and others alike, so sustainable for-profit models may
        be developed. Regulatory measures also help, but ultimately,
        market approaches have the strongest impact (me thinks).

            He asked me some interesting questions which I
            hadn't thought of myself-
            1)What happens if two rooms are opposite to each other. Will the
            fingerprint be different?

        Yes, it should be... we are completing some benchmarking tests
        to characterize how this works.

            2)The application is good as a location finder but if you
            want to
            navigate in a building then fingerprint will only be
            different after a
            certain range...what will be that range?...

        fingerprint patterns change a lot when there are lots of
        barriers (like walls, floors/ceilings), thus the range tends to
        include full-rooms (whatever their size).

            also the map of the building
            should already be known by the application. If the rooms are
            numbered in
            an ordered fashion then it could easily be assessed in which
            way one
            should move to reach the destination once you know the
            proximity but
            what is rooms are not ordered.

        Yes, mapping has to be done before hand. We'll be working on
        developing tools that facilitate this process as part of getting
        a building ready for indoor positioning.

            One more guy suggested another application of this
            technology. Suppose
            you have a house with multiple rooms. Now if a telephone
            call comes then
            you don't want all the phones to ring...through wifi
            fingerprinting it
            can be sensed that in which room you are and only that phone
            can be made
            to ring.

        This is a really cool application... useful to me since I don't
        want the phone in the baby's room to ring when he is asleep. We
        should get a wiki application ideas page started. Would you mind
        doing that?

            I know that all these will be applications once we are
            through with the
            project it seemed very interesting to me so I thought I will
            share it
            with you.

        great, thanks!

            -Ravi Agarwal



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