[gps-talkusers] Re: Accessible GPS app question
- From: "Charles LaPierre" <charles@xxxxxxxxxxxxxxxx>
- To: <gps-talkusers@xxxxxxxxxxxxx>
- Date: Tue, 23 Jul 2013 12:22:09 -0700
Hello Justin,
The short answer is those addresses are geocoded and act like points of
interest for every house number. Traditionally map companies like TomTom
and NavTeq took the approach that the addresses on a given block ranged from
100-199 and it was up to the software to figure out that if you were 1/4th
the way down the street you were probably near 125. But a geocoded address
at 1/4th the way down the street maybe 105 since the buildings are very
large and don't go sequentially down the street. Hence the discrepancy.
The long answer, most if not all map providers are now scrambling to catch
up and replace their interpolated address ranges for a block with exact
geocoded addresses, but this costs a lot of money not to mention a lot of
extra memory. It's really easy to say that this block goes from 100-200,
but takes up 100 times the amount of data to actually have a lat/lon for
every house along that street. Most map providers charge a premium to get
this point address information. Google and others have put in massive data
collection by driving every street in the USA collecting this data, and it
doesn't come cheap. Sure they will implement their own map product with
this highly accurate geocoded address data, to convince others to switch
from a certain phone or software to use their own, and will charge others a
lot to use this data. The data is there or is getting there, but the trick
now is getting access to this data for a reasonable price and in a format we
can easily use.
Hope this helps.
Charles LaPierre, CTO Sendero Group
Developers of accessible GPS and distributors of technology for the blind
Office Phone: 888-757-6810
Email: Charles@xxxxxxxxxxxxxxxx
Sendero web: http://www.senderogroup.com
General GPS Web: http://www.AccessibleGPS.com
-----Original Message-----
From: gps-talkusers-bounce@xxxxxxxxxxxxx
[mailto:gps-talkusers-bounce@xxxxxxxxxxxxx] On Behalf Of Justin Hull
Sent: Tuesday, July 23, 2013 11:21 AM
To: gps-talkusers@xxxxxxxxxxxxx
Subject: [gps-talkusers] Re: Accessible GPS app question
Hello,
I have a fairly technical question. I have noticed that on Siri maps it will
give me my exact location up to and including the exact street number of the
address where I'm stationed at. Does anyone know why using nearby explore
or the Seeing Eye GPS application the addresses are about half a block off
and do not give you the exact address location?
Thank you
Have a great day.
Justin Hull
On Jul 23, 2013, at 12:03 PM, "Christian" <christian08@xxxxxxxxxx> wrote:
> Hi all,
> I have just joined this list and I look forward of hearing about new
things here.
> I have a Trekker Breeze GPS, but I have found that there are many
addresses that it can't find and street numbers cant be found either, even
if the address has been around for many years.
> So, the map data is not that all good so I have had to create many
favorites.
> I am using Android as my main mobile platform and I have been trying
Google maps and and app called Walkytalky to get information on the street I
am currently passing.
> And the maps are far better than the maps on the Breeze!
> But, now, to my question.
> Does anyone know of any app that might be worth looking at and that will
work outside of the states?
> Many thanks for any help,
> Christian
>
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