On Tue, Mar 31, 2015 at 1:23 PM, Bob Jolliffe <[email protected]> wrote:
> Knut, the nub of your argument seems to be to to implement shapefile > import as an augmentation to dhis - something which I also saw Calle > and others suggest in earlier thread. > > Its not necessarily a bad idea, It is not just an idea, it has already been done, cf. Sushil's post. > but my point is that I don't think > this would be easy to do as an "app". I might of course be wrong about > this. But I can't see the processing of shapefiles (which are > misleadingly called files) being easily done in javascript in the > browser. Mapshaper does exactly that: http://www.mapshaper.org/ > So I think you are going to have some additional java code > in the core - not necessarily a lot, but some. > The only challenge will be size. I think the limit of the old, Flash implementation was 80 MB. No such limit is displayed for the new one: http://www.mapshaper.org/offline.html > Someone like Jan might know better. > > Regarding a high level architecture view, I suppose the tension here > is between simple tools which do what they do well but are not always > easy to put together when you don't know what you are doing (the unix > philosophy, and ogr approach) vs limitless growth to the web > application and pumping-up-the-jam :-) There are forces which drive > both rationales. > Certainly. But in this case, we already have the Unix approach available, and it's well documented, but still quite daunting for some users. What Sushil is building is the "point-and-click" version, but better than that, because we also leverage the DHIS Web API to link with existing OU (e.g with alternative spellings) Knut > > On 31 March 2015 at 12:02, Knut Staring <[email protected]> wrote: > > From an architectural view of DHIS2 as a platform, it is quite > interesting > > to see suggestions coming up about third party solutions such as QGIS > when > > there is already an attempt well underway to build on our own app > framework > > to enable this functionality within DHIS2. Especially when this goes to > the > > heart of configuring the platform, namely bootstrapping the OU hierarchy, > > which forms the backbone of an implementation. > > > > There are several pieces to the puzzle: Reprojection, > > Simplification/Generalisation, Linking to existing OU hierarchy. To me it > > seems natural to want to pull this away from a series of command line > steps > > and external tools, but it is interesting to hear arguments in other > > directions, also for Sushil's thesis. Feedback from the community is > > important. Of course, we used to have such an external module with the > > DataMart, but that was on the output side (not configuration) > > > > Knut > > > > On Tue, Mar 31, 2015 at 12:34 PM, Knut Staring <[email protected]> wrote: > >> > >> My point is that mapshaper already reads the shapefile, and Sushil's app > >> built around it already exists. > >> > >> You are right that some shapefiles are really heavy (thus the need for > >> mapshaper). > >> > >> On Tue, Mar 31, 2015 at 11:50 AM, Bob Jolliffe <[email protected]> > >> wrote: > >>> > >>> That is a handy enough library for dealing with projection all right. > >>> But doesn't really help in reading the shapefile, which *might* be a > >>> bit of a heavy lift for an app dealing with dbf and shp files. I'm > >>> not convinced this would be a really good use of developer time. > >>> > >>> QGis already does all the grunt work of reading in the shapefile and > >>> dealing with the various oddnesses. Getting it to dump its output as > >>> dhis orgunits seems like a relatively straightforward proposition. > >>> But you can't assume everyone would want to use qgis. > >>> > >>> Maybe another approach would be to create a simple less geeky ui on > >>> top of ogr2ogr. dunno really. I'm not seeing a silver bullet here. > >>> > >>> On 31 March 2015 at 10:12, Knut Staring <[email protected]> wrote: > >>> > Much better use of developer time would be to include > >>> > http://proj4js.org/ in > >>> > Sushil's app, so that everything needed comes in one sweet package. > >>> > > >>> > > >>> > On Tue, Mar 31, 2015 at 11:10 AM, Knut Staring <[email protected]> > >>> > wrote: > >>> >> > >>> >> shp2gml is taken care of by ogr2ogr, as described in our manual. > >>> >> > >>> >> Yes, someone could write a QGis plugin, but why should they, since > we > >>> >> are > >>> >> now working on a web app to do this. Granted, it does not (yet) > >>> >> include > >>> >> reprojection, but it does include the other crucial step of > >>> >> generalisation > >>> >> using http://www.mapshaper.org/. > >>> >> > >>> >> On Tue, Mar 31, 2015 at 9:53 AM, Bob Jolliffe < > [email protected]> > >>> >> wrote: > >>> >>> > >>> >>> Of course shp2gml tools already exist - they could be described as > a > >>> >>> bit geeky using the command line. Though there is need for some of > >>> >>> those geeky options for dealing with projection systems and the > like. > >>> >>> > >>> >>> I think someone with some python know how could write a neat little > >>> >>> QGis plugin to export to dhis2 format which *might* make it easier > >>> >>> for > >>> >>> users. > >>> >>> > >>> >>> On 30 March 2015 at 18:59, Lars Helge Øverland < > [email protected]> > >>> >>> wrote: > >>> >>> > Shape file import sounds like an ideal task for an external > >>> >>> > developer, > >>> >>> > as it > >>> >>> > could transform the shapefile content and pipe it into the GML > >>> >>> > importer > >>> >>> > and > >>> >>> > hence does not require lots of DHIS 2 knowledge. > >>> >>> > > >>> >>> > Lars > >>> >>> > > >>> >>> > > >>> >>> > _______________________________________________ > >>> >>> > Mailing list: https://launchpad.net/~dhis2-devs > >>> >>> > Post to : [email protected] > >>> >>> > Unsubscribe : https://launchpad.net/~dhis2-devs > >>> >>> > More help : https://help.launchpad.net/ListHelp > >>> >>> > > >>> >>> > >>> >>> _______________________________________________ > >>> >>> Mailing list: https://launchpad.net/~dhis2-devs > >>> >>> Post to : [email protected] > >>> >>> Unsubscribe : https://launchpad.net/~dhis2-devs > >>> >>> More help : https://help.launchpad.net/ListHelp > >>> >> > >>> >> > >>> >> > >>> >> > >>> >> -- > >>> >> Knut Staring > >>> >> Dept. of Informatics, University of Oslo > >>> >> Norway: +4791880522 > >>> >> Skype: knutstar > >>> >> http://dhis2.org > >>> > > >>> > > >>> > > >>> > > >>> > -- > >>> > Knut Staring > >>> > Dept. of Informatics, University of Oslo > >>> > Norway: +4791880522 > >>> > Skype: knutstar > >>> > http://dhis2.org > >> > >> > >> > >> > >> -- > >> Knut Staring > >> Dept. of Informatics, University of Oslo > >> Norway: +4791880522 > >> Skype: knutstar > >> http://dhis2.org > > > > > > > > > > -- > > Knut Staring > > Dept. of Informatics, University of Oslo > > Norway: +4791880522 > > Skype: knutstar > > http://dhis2.org > -- Knut Staring Dept. of Informatics, University of Oslo Norway: +4791880522 Skype: knutstar http://dhis2.org
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