[Gvsig_english] saving project storing relative path names to layer sources

Thu Jan 3 15:01:35 CET 2008

> Relative path is what makes it possible! the relative path is to  
> the project file e.g. <some path data which may be in Unix form / 
> blah/home/foo/projects>/<my project name>/<subfolders> - this moved  
> to Windows or a different Unix or just a different computer just  
> needs to know the start point. The fact the Windows computer  
> (currently) uses a mapped "drive" at G:\ or a \\servername\folder  
> is not important, nor is it important that on my computer the path  
> was /home/user/projects and on your mac it was /users/user/ 
> documents/sigprojets. What matters is the paths that follow, even  
> if they include shortcuts (would be mounts in Unix, but Windows  
> users need to be involved too!).
Anyway, we try the 2 ways and relative doesn't do the jobs... Moving  
around project doesn't work in relative since projects move but the  
data to point at... doesn't... so for us at least... we use full  
path... So... leave at user the choice.
>
> Not sure what scale you are at, but PostGIS scales in all  
> directions i.e. being open source and enterprise class, there is  
> almost no situation in which (strategically) it is not the best  
> option. And even in that small minority it would be advisable to  
> start looking at it!
All is question of time and money... I work part time for a small  
firm who make maps on arcview and now arcmap.  Moving from personal  
database to file database is verry easy.  But... for them, the use of  
database like postgis it out of the question for now... So, if I  
whan't to push gv_sig, it has to be as simple to just link to the  
huge data they already have... not making a duplication of data.

Imagine... they start with arcview 3 but when passing to arcmap 9,  
the need to keep av3 since the conversion betwen the two was to time  
consuming.  So if, when gv_sig will be ready for map production, I  
hope to challenge them to use it, the time need to learn gv_sig is a  
drawback but if in top of that.... we have to duplicate all the  
source (since old projects in aw3 or am9 whon't be redone) to  
accomodate postgis....  to time consuming...

>
> Our approach is to move to cross-platform and platform neutral  
> solutions wherever possible, and in GIS this means moving spatial  
> data to a database which multiple applications can read/write. This  
> allows a gradual migration to new software, or in our case a mix of  
> products depending on user and use case.

I agree with that.... but think of compatibility with de facto  
standard... esri.... at least...

Marcel
>
>>
>> Marcel
>> Le 08-01-02 à 06:41, Chris Puttick a écrit :
>>
>>> IMNSHO file paths referenced in applications should never be
>>> absolute, because they can't be. Even if you stick within Windows,
>>
>>> you are making the poor assumption that the application will only
>>> ever be one computer on one version of Windows, or all
>>> organisations have network shares configured the same way (and
>>> still use network shares rather than repositories). And good
>>> applications (read "applications I permit organisations I manage to
>>
>>> use" ;) ), like gvSIG, do not only work on Windows, and it is only
>>
>>> on Windows that the silly concept of drive letters even exists...
>>>
>>> Why would you use absolute file paths?
>>>
>>> Chris
>>>
>>> Chris Puttick
>>> CIO
>>> Oxford Archaeology: Exploring the Human Journey
>>> Direct: +44 (0)1865 263 818
>>> Switchboard: +44 (0)1865 263 800
>>> Mobile: +44 (0)7917 058 568
>>> http://thehumanjourney.net
>>>
>>> ----- Original Message -----
>>> From: "Sergio Clark" <sergio.clark at iver.es>
>>> To: "Users and Developers mailing list"
>>> <gvsig_internacional at runas.cap.gva.es>
>>> Sent: 02 January 2008 11:32:14 o'clock (GMT) Europe/London
>>> Subject: Re: [Gvsig_english] saving project storing relative path
>>> names to layer	sources
>>>
>>> Hello Ernesto,
>>>
>>> Yes, that is a good idea. We've been discussing about it recently,
>> and
>>> we're looking for the best solution. Maybe introduce a checkbox
>>> with the
>>> option Absolute or Relative Path when creating a project, in order
>> to
>>> solve this problem of portability on different workstations.
>>>
>>> For the moment (it's not the same but also helps the users ;-)) it
>> has
>>> been implemented the option for choosing a new path when gvSIG
>> doesn't
>>> find the original path of a layer, because layer has been moved or
>>
>>> we're
>>> working in a different workstation. With this, users could see,
>>> layer by
>>> layer, which have not been found and introduce the correct new
>> path.
>>> This new option is implemented for gvSIG future version 1.2.
>>>
>>> Regards! And thanks for your suggestion.
>>>
>>> Sergio.
>>>
>>> -- 
>>>
>>> Sergio Clark
>>> Equipo gvSIG
>>> IVER T.I., S.A.
>>> www.iver.es
>>> www.gvsig.com
>>>
>>>
>>>
>>>
>>> ernesto sferlazza escribió:
>>>> Hi all
>>>> Since I've created several replicas of a geographic archive,
>> having
>>>> the same directory tree schema, on different workstations or
>>>> groups of
>>>> workstations operating on different Local Area Networks not
>> connected
>>>> among them, I think it would be very useful to save projects with
>>>> "store relative path names to data sources" option instead of the
>>>> defaul absolute path available in GVSIG.
>>>> In this way I could distribute easily updated versions of a
>>>> project to
>>>> all users, without the need of customization of *gvp file
>> (changing,
>>>> for example, the path from " C:\SIT_provinciaAG \TRASPORTI\STRADE"
>> to
>>>> " F:\archivioSIT \TRASPORTI\STRADE") using a text editor.
>>>> I have tried, also, to change with a text editor the full path to
>>>> relative path subtituting "..\" instead of the archive root path
>> (in
>>>> the example " ..\ " instead of " C:\SIT_provinciaAG \ ", but it
>>>> didn't
>>>> work as I believed.
>>>>
>>>> Best regards
>>>>
>>>> ing. Ernesto Sferlazza
>>>> responsabile Unità Organizzativa Sistema Informativo Territoriale
>>>> della Provincia regionale di Agrigento
>>>> piazza Aldo Moro, 1 - 92100 AGRIGENTO
>>>> tel 0922 401935
>>>>
>> ---------------------------------------------------------------------
>>
>>>> ---
>>>>
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>>>
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