[Loadstone] checkpoint distance
wendorff at uni-paderborn.de
Wed Sep 15 22:39:37 BST 2010
Thanks for your answer. Let me explain shortly what I try to do:
I want to provide "real" route descriptions for (blind) pedestrians.
When I tried the first time my problem was, that there has been other
checkpoints nearer than the "neighbours" along route. For example when
going around a building - 100 meters north, 15 meters west, and then
back south the points near the start position has been anounced again -
definitely the wrong points.
So I wanted to avoid that by providing more points in between. My 5
meter distance was a first try to do that - and yes, thats too short,
but 15 meters are too high in much cases, I fear as long as it's not
possible to give arbitrary long instructions - lodestone is restricted
to 75 characters; not enough to desribe more than the next simple
I know the restriction of about 1000 checkpoints - and that's not good
for practical purposes of longer routes with good descriptions, but for
my tests loadstone is working.
On 15.09.2010 22:18, Shawn Kirkpatrick wrote:
> Well, 5 meters is way too short for distance. Average gps accuracy is
> around 15 meters so you'd want distances higher than that. If you do
> what it sounds like you're doing, putting in all points as
> checkpoints, you'll have a lot of output and the program probably
> won't be useful for much else. You can only have about 1000
> checkpoints before the program runs out of memory so trying to store
> everything as a checkpoint just won't work.
> On Wed, 15 Sep 2010, Peter Wendorff wrote:
>> I try to create checkpoint route files currently.
>> My test file used distances between points of 5 meters and - my first
>> test file - distances as given by the openstreetmap data (nodes
>> describing the street- usually at least one node per direction change
>> and intersection)
>> 5 meters I considered as too much nodes, the screenreader repeatingly
>> started reading "Ankunft " and part of the first name-sibling, but
>> never speaking the whole content, because the next point is announced
>> before (German "Ankunft" is arrival in English - not sure what's the
>> word used in English loadstone).
>> My question is: what's known as good smallest distance between points
>> to avoid that behaviour?
>> Loadstone mailing list
>> Loadstone at loadstone-gps.com
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