Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>From what I understood of the API is that there is never a guarantee on actual distance, you should not use the readings to be considered an accurate measurement. The proximity is rather used to determine the relative distance between different beacons so that you can respond accordingly based on your applications requirements. </p> <p>With that said, Apple definitely draws a gray area in their documentation. The description of <code>measuredPower</code> is intriguing and easily instils the thought that you can use this value to get an accurate distance reading (once calibrated of course). I just don't think that is the case however, with the likelihood of signal attenuation in these significantly low powered devices, I don't expect you'd get consistently accurate readings of an actual distance. </p> <p>From the <code>CLBeacon</code> reference the description of <code>accuracy</code> reads </p> <blockquote> <p>Indicates the one sigma horizontal accuracy in meters. Use this property to differentiate between beacons with the same proximity value. <strong>Do not use it to identify a precise location for the beacon. Accuracy values may fluctuate due to RF interference</strong>.</p> </blockquote> <p>I feel that this inexplicably resonates throughout the entire usage of the iBeacon feature.</p> <p>This is all my interpretation, I've not gone as fas as testing this in multiple environments over time to see if consistent readings are given. I am not sure if this helps at all.</p>
    singulars
    1. This table or related slice is empty.
    1. POWhat are the nominal distances for iBeacon "Far", "Near", and "Immediate"
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USChris Wagner
    1. USChris Wagner
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. POWhat are the nominal distances for iBeacon "Far", "Near", and "Immediate"
      singulars
      1. PTQuestion
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTAcceptedByOriginator
    1. COI tend to agree with you. What I really want to know is what they intend with "immediate", as in "the user should pull out their phone and place it next to the beacon" or "the user should be close enough to the beacon to high-five it". Important for planning possible use cases.
      singulars
      1. PO
      1. USErik Kerber
    2. COI would guess that is the case, look at the new AppleTV feature where you touch your iPhone to the AppleTV to configure it (http://support.apple.com/kb/HT5900). I would wager they are using iBeacons with the Immediate proximity to trigger this.
      singulars
      1. PO
      1. USChris Wagner
    3. COI guess one use case for "immediate" would be the payment when you place your phone next to the cashier just like NFC. So if you have an app for paying and you know that it only works when you're in the store and close as NFC, that would be more secure rather than knowing you can pay while you are passing by on the other side of the street.
      singulars
      1. PO
      1. USMaziyar
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload