[Loadstone] Points and Checkpoints

Shawn Kirkpatrick shawn at loadstone-gps.com
Tue Nov 4 07:28:31 GMT 2008


Yes, this is right. In versions before 0.70 where only the coordinates were 
stored a checkpoint couldn't be looked up if the point wasn't in the 
currently loaded database.

On Tue, 4 Nov 2008, Miko³aj Rotnicki wrote:

> Thanks,
>
> So a chckpoint info in the checkpoint list and a specific point in the
> database are linked only by the id and user id.
>
> In opposite to the "previous" (I believe pre 0.70) system which
> matched checkpoint info and point in the database by the latitude and
> londitude only (of which the checkpoint info consisted)
>
> Am I right?
>
> Mike
>
> 2008/11/4 Shawn Kirkpatrick <shawn at loadstone-gps.com>:
>> Every point has an id field. This is usually set to the timestamp of when
>> the point is created. The combination of the id and userid fields creates a
>> unique id for each point that doesn't change. This way all other point
>> information can be updated.
>>
>> On Mon, 3 Nov 2008, Miko³aj Rotnicki wrote:
>>
>>> Hello,
>>>
>>> I know what a userid is, but what do ypu mean by the id?
>>>
>>> Mikolaj
>>>
>>>
>>> 2008/11/3 Shawn Kirkpatrick <shawn at loadstone-gps.com>:
>>>>
>>>> No, the coordinates are not matched, only the id and userid are used for
>>>> matching. This allows a point's coordinates to be updated in the
>>>> database.
>>>>
>>>> On Wed, 29 Oct 2008, Miko³aj Rotnicki wrote:
>>>>
>>>>> Hello,
>>>>>
>>>>> Thanks for the answer.
>>>>> But are the points in the database and checkpointlist still matched by
>>>>> the coordinates only?
>>>>>
>>>>> Mikolaj
>>>>>
>>>>> 2008/10/29 Shawn Kirkpatrick <shawn at loadstone-gps.com>:
>>>>>>
>>>>>> A point's id and userid are used to relate it to the database. When a
>>>>>> checkpoints file is loaded the currently loaded database is checked to
>>>>>> see
>>>>>> if any of the checkpoint data is out of date. If so, then the
>>>>>> information
>>>>>> about the point from the database is used. If the checkpoint isn't
>>>>>> found
>>>>>> in
>>>>>> the current database then the information is used as supplied. If you
>>>>>> update
>>>>>> a point's information and you have that point marked as a checkpoint
>>>>>> then
>>>>>> you should probably resave your checkpoints file to make sure all
>>>>>> information is up to date. If you only ever use a single database then
>>>>>> you
>>>>>> don't have to worry about this as much.
>>>>>>
>>>>>> On Tue, 28 Oct 2008, Miko³aj Rotnicki wrote:
>>>>>>
>>>>>>> Hello,
>>>>>>>
>>>>>>> Which "fields" associate (link) a point to a checkpoint (in the
>>>>>>> checkpoint list)?
>>>>>>> As for versions prior to 0.70, I believe, a checkpoint data consisted
>>>>>>> only of latitude and longitude
>>>>>>> for example a checkpiont data was:
>>>>>>> 52.0543951  16.4325653
>>>>>>>
>>>>>>> which anabled the association (link) to a point:
>>>>>>> "Point name",520543951,164325653,1,0,0,1,1225189128
>>>>>>>
>>>>>>> Since 0.70, checkpoint data are almost the same as point data.
>>>>>>> Sometimes extended with a comment "field".
>>>>>>>
>>>>>>> So which "fields" do the linking now?
>>>>>>>
>>>>>>> What is the synchronnization between the point and checkpoint data?
>>>>>>> Please explain in details if possible.
>>>>>>> What will happen to the checkpoints data when I update the point's
>>>>>>> name?
>>>>>>>
>>>>>>> Hope my questions are clear.
>>>>>>>
>>>>>>> Mikolaj Rotnicki
>>>>>>> _______________________________________________
>>>>>>> Loadstone mailing list
>>>>>>> Loadstone at loadstone-gps.com
>>>>>>> http://www.loadstone-gps.com/mailman/listinfo/loadstone
>>>>>>
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>>>>>>
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