What is the accuracy of the iPad GPS?

Looking for an answer in the form +/- <feet> . Many thanks in advance.

http://itunes.apple.com/us/app/motionx-gps-lite/id293935935?mt=8
http://itunes.apple.com/us/app/handy-gps-and-compass/id319244349?mt=8

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Question about the accuracy of the Gaussian Fit

Hi all,
I was having some doubts on the accuracy of the gaussian fit performed by LabVIEW and implemented the code in attachment to test it.
I made a distribution and made a Gaussian fit to it and extracted the average and standard deviation.
Then, I used the same distribution and padded it with zeros to the left and right and did a gaussian fit to the overall distribution.
I was expecting the average to change but the standard deviation to be the same, since the difference in the distribution are the zeros...
The thing is that neither the average (the average is a fractional value) nor the standard deviation are the expected.
Any hints on why this may be happening?
Thank you very much in advance!
Best regards.
Attachments:
gauss_fit_test.zip ‏17 KB

Your data is NOT a Gaussian and fitting it to a Gaussian is thus completely meaningless. As Lynn said, the lower graph adds a sigificant amount of zeros to the dataset and thus will bias the fit.
You can do a "not_equal_zero...boolean_to_0,1" on the y data and wire it to the weight to disregard all zero values. Now you get the same result.
You should actually change the parameter bounds to allow for a fit of the offset, and you'll see that the upper graph will have a lower offset (offset=-3.6) compared to the lower graph (offset=-0.5). Since you are forcing the offset to be zero, the fit will compensate by changing the width.
What are you actually trying to achieve with this exercise? If this simulation is similar to your real data, maybe you should fit it to a triangle function instead. If you just want to calculate the mean and standard deviation of the data, use the classic statistics tools. Does this represent a histogram of some data?
LabVIEW Champion . Do more with less code and in less time .

What's the BEST voice command iPad GPS?

I'm surprised this didn't get more hits when I searched, so forgive me for posting... but I GOTTA know as I'm falling out of love with MapQuest GPS app, which I thought was killer, well it certainly isn't bad and the price, right? FREE!
But I need something better and I'd love an app that gave me optional routing like MapQuest does online via browser but not in it's app. How odd. Are there any iPad GPS apps that give you multiple route choices? Car Navs do too.
I also think we need an S&M voice that beats you mercilessly if you make a wrong turn Kidding. Well, sort of. Really why don't GPS voices have fun?
But seriously, what say you Apple Discussions Crowd? What's the must have, don't even think of getting any other app, this one will change your life. Etc.
What is the panicea of voice command GPS iPad apps. If it maes a diff, I have an iPad1.
Thx,
Steven

Yeah I had it take me way off course once too. But usually it's been pretty good. But I kept thinking you get what you pay for and if you get one that costs versus free it may be better. I just downloaded GPS Drive MotionX but the interface is a bit complex where as MG is easier but MotionX got a lot of positive reviews so I thought I'd try it. I'm trying to input a trip and finding it hard to input a starting point that is not where you are whereas MQ is easy.
I'm sure it's there, but not obvious in MotionX. Should be a button for start and then destination. Seems evertything I do sets the destination and can't figure way to set the start point and the system defaults to your GPS location as opposed to a start other than that.
Every button I press the voice asks for my destination. I can't figure how to set a start point. Hmmm.
Maddening. Everything is about the destination. Can't set origination.
I give up. I'll contact their tech support to find out how to set start point.
Shouldn't be this hard or unobvious. Bad user experience. Completely unintuitive. BUT.. once I figure it out, it may be as great as all the positive reviews in the App Store say about it. I'll let you all know...

How to determine the accuracy of the frame rate using a Basler sca640-70gm?

To whom it may concern
I am guessing that the time between each frame varies from a nominal set frame rate.
How do I set that nominal frame rate?
How do I determine what the actual (frame by frame) frame rate or time between frames was in post pressing of the "video" image.
Thank you,
Todd
Solved!
Go to Solution.

It is almost impossible to measure the frame rate accurately by measuring the time between consecutive frames. The latency of sending the images over the ethernet means they won't arrive at the computer with the same exact spacing they were taken at. Also, measuring the length of one short interval in LabVIEW is also very difficult. Windows latencies and other issues could make your measurement be off by quite a bit.
The only way I can see to verify the frame rate is to use a digital input into a counter and wire the shutter signal directly from the camera into the digital input. You could program the counter to measure between the rising edges of the shutter signal, and you would find out the frame rate is indeed very accurate and repeatable.
The only other way I know to accurately measure the frame rate in LabVIEW is to measure the time over a large number of frames (thousands) and divide the number of frames by the total time. Any minor errors in measuring the timing of a single frame go away with the large number of frames.
Bruce
Bruce Ammons
Ammons Engineering

How do I calculate the accuracy of the NI 9239 AI module

Hello all,
I am in the market for an AI module that can help me resolve angles to an accuracy of 1/10 of a degree. I am going to have a resolver and I want to do the work of a resolver to linear converter by reading in the signals and doing the math with an NI 9239. I am just trying to figure out if I can get the accuracy I need out of it. How do I go about figuring this out. I don't want someone to do it for me just some help to step through it.
The 9239 has 24 bit resolution and I am using it from +/- 10V, so a 20 volt range. This should give me an accuracy of
20/((2^24)-1) = 1.19x10^-6 V/bit
Is this correct, so I should be able to get an accuracy of a 1/10 of a degree?
Solved!
Go to Solution.

You could also use an encoder wheel and the counter input on the DAQ device. To gain additional accuracy you could then gear the encoder by 10:1 or 100:1
Measuring very small voltages often results in erroneous values being read from induced currents or nearby interference. If you still want to use the analog input, then you could still gear up your measuring device, which would decrease your potential error ratio
*EDIT - Spacebar went all strange and posted the unfinished message O_o
Message Edited by yenknip on 10-14-2008 04:09 PM
- Cheers, Ed

What does the 'Accuracy' result mean?

Hi,
I created a test exercise - all done with scored click boxes, etc. - and when I tested it, I got an "accuracy" rating of 22%, although I had all the answers right.
Can anyone tell me what this rating means? Thanks...

Normally Accuracy is the score in percentage. So if you create a quiz with Total point = 40, the Score will give you the result in points, p.e. 36 (out of 40) and the Accuracy returns the calculated percentage (in this example 90%). Up till now I never had problems with this result, but I always publish to a LMS and have been checking the individual results on the different questions. I even prefer to report the Percentage (in this case, Accuracy) to the LMS. I do not know exactly what happened with you. How did you test? Was it after publishing?

What is the accuracy of frequency measure with PCI 6023E?

I am measuring the exact frequency of 2.7Mhz signal. using PCI-6023E ,how can i calculate the accuracy of the measurments?

See
http://exchange.ni.com/servlet/Redirect?id=8437352
Regards
Filipe A.
Applications Engineer
National Instruments

How fast and accuracy of the FPGA's clock reference

I may need to make a application as below, but the requested accuracy is around 10ns. Can FPGA help on it? I am new newphie on FPGA.
- Triggered by an external pulse and start a accurate number counter for a high frequency clock signal(Maybe 100MHz)
- Triggered by another external channel to stop the counter and lock the result.
- From the lock result, calculate the time duration from the 1st to 2nd trigger.
Thanks,
Solved!
Go to Solution.

Hey Christian,
I wonder about the accuracy you have stated for the FPGA Clock. In reference to what time the accuracy can be given as 250 ps? When dealing with the accuracy of my counters, I always assumed that the accuracy is the same as the real time clock (200ppm / 35ppm). If the accuracy is 250ps per cycle, it would be equal to an error of 1 %... or 250 ppb in one second. Both does not occur realistic to me.
can you please speciify that information?
Thank you, Christian

Accuracy of the Keyboard?

Hi,
I noticed that when I type a text message, the words that come automatically when I spell it wrong have nothing to do with the word I wanted to type. But before, it was working perfectly well and I was really surprised by the accuracy of the keyboard.
I hope I won't have to restore my iPhone.
Does anyone else have the same problem as I do?
THanks!
Vinny.

Something happened in a software update after 2.0, the iPhone doesn't seem to "learn" words for me anymore. I can cancel a suggestion 23 times and it still gives me the same stupid one over and over.

Accuracy of the GPS

I'm analyzing the accuracy of geotagged photos using the iPhone 3G. After taking a picture, it looks like the latitude and longitude fields in the EXIF only store up to 1/100th precision.
For example, a typical lat/lon entry in the EXIF might be:
lat: 47 deg 38.56000'
lon: 122 deg 8.49000'
Has anyone ever seen a lat/lon entry with more precision, on a photo taken from an iPhone?
Another issue is that I have no idea whether the iPhone is using cell-tower triangulation, a GPS fix, (or wifi??) to obtain the location. Depending on the source for obtaining a lat/lon fix, I may get better (or worse) accuracy. Does anyone know how to tell what the iPhone is using for location when it geotags the photo?
Thanks!

http://itunes.apple.com/us/app/motionx-gps-lite/id293935935?mt=8
http://itunes.apple.com/us/app/handy-gps-and-compass/id319244349?mt=8

What i need out of the Ipad.

I have been facinated with the potential of an ipad. They are the future in portable computing (Similar to Pad's in Star Trek) But Ipad should do much more than it does now.
1. I would like for the ipad to serve as an extension of my Mac. Seamless Connectivity with the mac operating system.
2. I mainly would want the Ipad as an interface to my MAC. Type Edit documents (Spreadsheets/Documents/Presentations)
3. Watch videos from my MAC. watch DVD's in the MAC.
4. Would definetly like some kind of connectivity with my friends (Non Mac users)
5. Access my Company's VPN and connect to the shared drives and work on documents.
6. GPS independet of the mobile networks.
7. Connect my External Hard disk and access files from it.
8. Print from my mac.
to bunch it togeather i would like the ipad to be a true extension of my MAC. (i know there are workarounds with some apps but would like it to be a part of the iOS......
If there are ways to do this on the ipad i would definetly go buy one right now. Anyone can give suggestions?
And if people working for Apple are reading this probably you guys can get started on this. i can think a whole lot of people will benefit from this. Ipad is not an expensive toy anymore it is a serious tool.

1. I would like for the ipad to serve as an extension of my Mac. Seamless Connectivity with the mac operating system.
I'm not sure what you would mean by this. Perhaps if you describe further what you would consider "seamless connectivity", someone here can offer suggestions. You'll want to explain this more fully if you submit feedback to Apple
2. I mainly would want the Ipad as an interface to my MAC. Type Edit documents (Spreadsheets/Documents/Presentations)
You can do this now. There are a number of apps, including the iWorks for iPad and Documents to Go, that allow you to edit such documents, and a number of different ways of getting access to the documents.
3. Watch videos from my MAC. watch DVD's in the MAC.
You can watch videos from your Mac now. If theyr'e in iTunes, it's easy; you just use Home Sharing from the iPad. It's probable that you've never be able to watch a DVD disk, since that would require licensing (with payment for the license) and creation of a DVD player for the iPad, and the movie studios would have to be willing to allow remote access, something which is unlikely. The trend everywhere is to digital downloads of movies, so putting in the effort in licensing and engineering to try and allow DVDs to be played is unlikely to ever happen.
4. Would definetly like some kind of connectivity with my friends (Non Mac users)
Again, you'll need to explain further what "connectivity" you mean.
5. Access my Company's VPN and connect to the shared drives and work on documents.
There are several apps that allow direct connection to a network. FileBrowser is one that is often recommended.
6. GPS independet of the mobile networks.
The GPS in the WiFi+3G unit is independent of the mobile networks, in that you don't need to have a data account to use the GPS feature. Due to the cost of the chips, it would probably not be cost-effective for Apple to try and add true GPS to the WiFi-only unit.
7. Connect my External Hard disk and access files from it.
Cloud and network access are the way things are headed so this is unlikely, but you can suggest it to Apple.
8. Print from my mac.
Again, you can do this now in several ways. Printopia is one application that allows you to easily set up to print from your iPad through a printer connected to your Mac, but there other apps and workarounds as well.
Regards.

What's the difference between the iPad wifi and iPad wifi 3g? Okay, so I'm planning to buy an iPad and would like to know more of the details. I know that ipad wifi 3g would offer me with internet usage anywhere and anytime.

What's the difference between the iPad wifi and iPad wifi 3g? Okay, so I'm planning to buy an iPad and would like to know more of the details. I know that ipad wifi 3g would offer me with internet usage anywhere and anytime.

Welcome to the Support Communities. The differences are spelled out here:
http://www.apple.com/ipad/specs/
...For example, note that the Wi-Fi + Cellular model has assisted GPS for more accurate pinpointing of your geographic location.

Is there a way of connecting the ipad to the smart board in the classroom, so that the smartboard is the control, and the ipad is displaying what is on the smartboard? This is to help a visually impaired child see what is on the smartboard.,

Is there a way of connecting the ipad to the smart board in the classroom, so that the smartboard is the control, and the ipad is displaying what is on the smartboard? This is to help a visually impaired child see what is on the smartboard.

Absolutely!
Install Splashtop2 on the PC and enable it to be controlled or ran from iPad or Reflection to simply allow iPad to serve as PC unwired monitor. With Splashtop and an Apple TV connected, you use the smartboard as usual, yet the PC and iPad can see the same content. The impaired child can even interact with the Smart Board via the iPad as if he were writing directly on the big screen. Erasing functions can be done by touching the Smart Board manual controls. Several variables are in play that cause this lack of functionality:
    Apple won't permit PC software that infringes its proprietary apps.
    Smart Board companies refuse to develop iPad apps because they feel threatened and are being replaced by iPads
    School districts think Apple TV is meant for copyright infringement and could expose them to safe harbor lawsuits
    Network administrators make it impossible to login Apple TVs because they don't want the streaming occurring
    Classrooms are not able to keep up with the technology of using the iPad
    Clicker companies refuse to play with iPad because they see it as a potential threat to their core business clients
    Apple is not working as hard as it could to exploit its capabilities in education, thus losing money in iPad sales
The bottom line is that we educators and technology developers are hurting our childern with petty conflicts.

HT201269 When I try to setup my new iPad air, I go through all the steps for the iCloud sign-in and choosing security questions and what not. But after I hit the agree to the terms and conditions... It says Apple ID could not be created because of a serve

When I try to setup my new iPad air, I go through all the steps for the iCloud sign-in and choosing security questions and what not. But after I hit the agree to the terms and conditions... It says Apple ID could not be created because of a server error. Have no clue what to do... I've restarted the iPad and get the same message. But my internet works just fine.

1. Turn router off for 30 seconds and on again
2. Settings>General>Reset>Reset Network Settings

What is the difference between an ipad 2 and an ipad mini?

i want to know what the difference between them are as i already have an ipad 2 and want to know what is the dfference between an ipad mini and an ipad 2 and weather i should buy one.

iPad Mini vs. iPad 2 vs. iPad 4: Which iPad Should You Buy?
http://www.padgadget.com/2012/10/25/ipad-mini-vs-ipad-2-vs-ipad-4-which-ipad-sho uld-you-buy/
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http://support.apple.com/kb/HT5457
 Cheers, Tom

What is the accuracy of the iPad GPS?

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