I'm currently using Google Earth + KML Files to visualize Aircraft Flightpaths in 3d, it works perfect and also looks fine, but the big disadvantage is, that there seems to be no way to feed "live" data to Google Earth and draw the Flightpaths in Realtime.
Is there an alternative that is capable to display live data without manually reloading a file or anything like this? Satellite Picture surface would be an absolute MUST.
Maybe someone out there knows a proper solution for my project.
Thanks
The KML NetworkLink tag provides several ways to automatically update/reload a KML file, which will let you provide "live" data. You can either make the NetworkLink update the KML every time the user stops moving the map (with a setable delay), or on a timer (eg: every 10 seconds). Look at the KML Reference and developer tutorials for more info.
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Please help to get GPS track with time from .mov file.
The file is fom car camera and consists GPS data because its viewer shows car position.
What is right way to do that?
You don't say if you're looking for a programming solution to parse the file and read the GPS metadata yourself, or whether you're looking for a tool that will display the data.
It also depends very much on the specific camera that recorded the file as they embed data in different formats. If you have an iPhone, for example, it records GPS data in a mdta metadata atom with key "com.apple.quicktime.location.ISO6709", but other formats exist too, especially if you mean real time varying GPS data embedded in each frame, rather in the header for the movie as a whole.
Tools that will read such data from the movie header include ExifTool and CatDV (though the latter is a commercial product).
I found that ffprobe from the ffmpeg project was able to extract the com.apple.quicktime.location.ISO6709 tag.
Im new to NAudio but the goal of my project is to provide the user with the ability for the user to listen to an MP3 and then select a sample or a "chunk" of that song as a sample which could be saved to disk. These samples would be able to replayed at the same time (i.e. not merged but played at the same time).
Could someone please let me know what the overall strategy required to achieve this (....not necessarily the specifics...almost like pseduo code....).
For example would the samples / chunks of a song need to be saved as a WAV file. And these samples could be played together in the WAV format, etc.
I have seen a few small examples of a few implementations of some of the ideas Ive mentioned above but dont have a good sense of the big picture just yet.
Thanks in advance,
Andrew
The chunks wouldn't need to be saved as WAV files unless you were keeping them for future use. You can store the PCM audio (Mp3FileReader automatically converts to PCM) in a byte array and use RawSourceWaveStream to play them.
As for mixing them, I'd recommend using the MixingSampleProvider. This does mean you need to convert your RawSourceWaveStream to IEEE float, but you can use Pcm16BitToSampleProvider to do this. This will give the advantage that you can adjust volumes (and do other DSP) easily on the samples you are mixing. MixingSampleProvider also auto-removes completed inputs, so you can just add new inputs whenever you want to trigger a sound.
My name is John and I am a grad student at the University of Florida. As part of my research one of my tasks is to create a piece of software that is to display a map of the surrounding area, which shows the current location (from a GPS), and to implement a shapefile (as a boundary outline). I am not able to really get enough information to get on the right track on how to do this, and would appreciate any assistance!
The project involves a large-scale robot that will be operated by tele-communication in rough terrain. So this mapping and gps software will need to be entirely offline, but the location in use will be known. It is very preferred to find a cost effective means to doing this process (maybe even a simple API that could do the simple task, dll libraries, or active x.
My initial guess is to use a geo-referenced image (that I would get the lat and long of and know the boundaries of that image). Then from a GPS I then would treat the image as an XY plot somehow and that would provide the current position. Obviously even this step can be a challenge depending on what kind of image, map, kml file, etc that I can find and use.
So I would appreciate any advice, suggestions, or comments.
Suggest you online reference source code, and then modify their own, this project is currently on the Internet, you can through search engines to find. Good luck!
I am developing a browser based game, and I have a big map there. The terrain of the map is static. Therefore, I have some thousands of tiles that will not change (whether they represent a forest, a desert, whatever), just the players above it can change.
Hence, I wanted to store all my map in the player's computer. I am working with Ruby on Rails, and those map information are passed from the server to the javascript that runs on the user browser, in order to render a pretty map. But it makes me pretty sad to have a 200kb .html file, containing all those map related information.
What would be the simplest way to solve this issue? Cookies! Well. That's what I thought. A complete map information can get to almost 200kb (they are pretty big). A cookie can have at most 4kb.. I don't feel that the right way to achieve my objective is to create tons of cookies, one for each row of the map, for instance. Is there any more elegant way to have this static information lie on the player's browser, without creating lots of cookies? A way to cache it on his browser? I mean.. I can cache a 400kb image, why can't I cache a 200kb map structure?
Thanks in advance!
Fernando.
Well, HTML Local Storage gives you 5 MB (though data is stored *as strings*, so the actual amount of data you can fit in the container is likely a lot less than 5 MB.
This limit is oddly fluid. For one thing, it's just a recommended limit; and for another, i.e., Webkit-based browsers use UTF-16, which immediately cuts that in half (2.5 MB).
Browser support for Local Storage is good: IE, Firefox, Safari 4.0+, Chrome 4.0+, and Opera 10.5+. Both iPhone and Android are supported above versions 3.0 and 2.0. respectively.
Using Local Storage to preserve game state appears to be a proto-typical use case.
Finally, Paul Kinlan published an excellent step-by-step tutorial on HTML5Rocks, which i highly recommend (though it's a little more than a year old).
Have you considered storing it in a js file? Most browser will cache linked js files, allowing you to only serve it every once in a while. It would be very simple to deploy.
Hello due to reasons of chinese paranoia and google being a bunch of pansies I am in the situation where I need to alter a number of gps waypoints stored in a gpx file so they are are correctly aligned with google map which is not correctly aligned... for reasons for aforementioned paranoia.
So I have a waypoint with a known landmark (railyway station) I can see that landmark on the google map, I would like to be able to move the waypoint in my gpx file to the new the one on the map and have all the other waypoints adjust accordingly.
This could be achieved by creating a new waypoint over the station on the map and calculating and then applying the difference or with some kind of GUI drag and drop.
I have no idea how to go about this and wonder if anyone knows of a decent solution other than persuading google to stop being pansies....
Of course google could change their magic misalignment randomly and then I'm truely screwed but hey ho.
Well you could build a small web app that takes your GPX track and overlays it on google maps. Then write some code to let the user enter some number of "corrected pairs" where they click on the GPX point and then the point on google maps. Once they have done this for n number of points, where n is the number of points you want to achieve accuracy, you can calculate an average errorX and errorY. Then you can go about and for each GPX point do X + errorX and Y + errorY which should be good on average.
Does that make sense?
Thanks for the reply TheSteveO I'd forgotten about this, in the end I used the rather handy javascript library provided here
http://www.movable-type.co.uk/scripts/latlong.html
To build myself a simple command line script which loads and realigns all the coordinates based on, as you suggested the difference between a known point on google maps and a waypoint of the same place.
I did attempt to implement it in php but unfortunately ran into a slew of floating point math problems and being pressed for time just went the javascript route.