dhis2-devs team mailing list archive

[Ola Hodne Titlestad <olatitle@xxxxxxxxx>]

Hi,

When starting to add GIS stuff to DXF it would be great to see the remaining
GIS metadata also become part of the DXF to make sure these can be
transferred between DHIS instances without having to deal with database
dumps and complete db replacements. There are some key GIS things that need
to be part of the metdata export such as map, maplayer,
maporganisationunitrelation and a few others. Without this it becomes a
nightmare to maintain the mapping module in DHIS2 across multiple
installations.

Ola
----------

On 19 May 2010 15:20, Knut Staring <knutst@xxxxxxxxx> wrote:

> I'm fine with using GML or KML as the exchange format and keeping the
> JSON snippets in the database. OpenLayers and GeoExt can also slurp up
> GML or KML, but I think it would mean bigger files and more processing
> (?).
>
> Writing converters shouldn't be a huge task.
>
> Knut
>
> On Wed, May 19, 2010 at 3:00 PM, Bob Jolliffe <bobjolliffe@xxxxxxxxx>
> wrote:
> > Good to see this stuff coming in.  I guess it is at least in part
> > related to transforming external GIS sources to dxf?
> >
> > Two points:
> > 1.  We need to make sure that we track these changes/additions in the
> > dxf schema.  Otherwise it will start to become useless.
> > 2.  I think how we store the data internally and how we express it as
> > xml should be treated as different (if intimately related) problems.
> > An element like:
> >
> > <organisationUnit>
> > ...
> >
> <polygonCoordinates>[[[39.376186,-4.715707],[39.379326,-4.719846],[39.373474,-4.717134],[39.376186,-4.715707]]],[[[39.406875,-4.683162],[39.400737,-4.690442],[39.394884,-4.687873],[39.406875,-4.683162]]],[[[39.269560,-4.652902],[39.286260,-4.663179],[39.29
> > ...</polygonCoordinates>
> > ...
> > </organisationUnit>
> >
> > is both unsightly and terribly bad practice.  This xml would be not
> > much more use than a database sql dump.  We have already made that
> > mistake with serializing all the table relations as xml.  It would be
> > a shame to repeat it again here where we have a fresh opportunity.
> >
> > I would strongly support Jason's suggestion that we not try to
> > reinvent a GIS markup - which we will probably do badly - but rather
> > that we simply embed those elements from GML (or KML or whichever -
> > you guys are the experts) which we need.  eg:
> >
> > <organisationUnit>
> > ...
> > <location><gml:Point>...</Point></location>
> > <area><gml:Polygon>,,</gml:Polygon></area>
> > ...
> > </organisationUnit>
> >
> > How we choose to represent those in the database is different.  if it
> > is totally impractical to use a standard gis markup (and I hope its
> > not) then at the very least we should ensure that we use home-grown
> > xml to represent the entities rather than embedded json.  How else
> > would an xml parser be able to make any sense of this.
> >
> > I guess the implication of what I am saying is that
> > writer.writeElement( FIELD_POLYGON_COORDINATES,
> > unit.getPolygonCoordinates() ); would need to be expanded in order to
> > not just dump the database content into the xml element.  Or wrapped
> > as
> > writer.writeElement( FIELD_POLYGON_COORDINATES,
> > unit.getPolygonCoordinatesAsXML() )
> >
> > Regards
> > Bob
> >
> > On 19 May 2010 13:14, Knut Staring <knutst@xxxxxxxxx> wrote:
> >> I see your point, Jason, but I think the most efficient would be to
> >> continue to store the coordinates as GeoJSON (to minimize processing
> >> for maps inside the system), and just generate the GML when exporting
> >> to external formats.
> >>
> >> For this, we should always use 4326 as projection. If in the future we
> >> want to deviate from that, we should definitely use Geoserver (which
> >> is a good idea anyway, e.g. to act as a Web Map Server to external
> >> applications), but this is not urgent.
> >>
> >> Here is how I am currently representing things in the database, which
> >> makes it really easy to generate GeoJSON on the fly:
> >>
> >> Point   [ 36.95, -0.93 ]
> >>
> >> MultiPolygon
> >>
> >>
> 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> >>
> >> Knut
> >>
> >> On Wed, May 19, 2010 at 2:01 PM, Jason Pickering
> >> <jason.p.pickering@xxxxxxxxx> wrote:
> >>> I think this is a good step in the right direction,but should be
> >>> considered still, an interim solution. There are limitations (for
> >>> instance the specification of the coordinate system) which points to a
> >>> need to a more generic object model. There are some better
> >>> alternatives (GML for instance) in my opinion.
> >>>
> >>> For instance..
> >>>
> >>> <gml:Point gml:id="p21" srsName="urn:ogc:def:crs:EPSG:6.6:4326">
> >>>   <gml:pos dimension="2">45.67 88.56</gml:pos>
> >>> </gml:Point>
> >>>
> >>> Is not so much more work for us to store, but makes sure we can begin
> >>> to import and export relatively standard data to external systems.
> >>>
> >>> Regards,
> >>> Jason
> >>>
> >>>
> >>> On 5/19/10, Knut Staring <knutst@xxxxxxxxx> wrote:
> >>>> On Wed, May 19, 2010 at 11:50 AM,  <noreply@xxxxxxxxxxxxx> wrote:
> >>>>> ------------------------------------------------------------
> >>>>> revno: 1887
> >>>>> committer: Lars <larshelg@larshelg-laptop>
> >>>>> branch nick: trunk
> >>>>> timestamp: Wed 2010-05-19 11:48:29 +0200
> >>>>> message:
> >>>>>  Added latitude, longitude, polygoncoordinates to dxf
> >>>>
> >>>> Happy to see this. I have been thinking that we don't really need
> >>>> latitude and longitude when we have the coordinates, but that we need
> >>>> a type field instead. The reason is that for GeoJSON generation we
> >>>> need to support POINT, POLYGON and MULTIPOLYGON, and it make sense to
> >>>> have these directly in the database. I have been experimenting a bit
> >>>> with this lately, and it works great, but I was forced to store the
> >>>> type in the geocode field.
> >>>>
> >>>> That being said, we may also consider having more than one coordinate
> >>>> field, for different levels of detail, though I'm afraid that can
> >>>> easily get messy.
> >>>>
> >>>> Knut
> >>>>
> >>>>
> >>>>
> >>>>> modified:
> >>>>>
>  dhis-2/dhis-services/dhis-service-importexport/src/main/java/org/hisp/dhis/importexport/dxf/converter/OrganisationUnitConverter.java
> >>>>>
>  dhis-2/dhis-support/dhis-support-jdbc/src/main/java/org/hisp/dhis/jdbc/batchhandler/OrganisationUnitBatchHandler.java
> >>>>>
> >>>>>
> >>>>> --
> >>>>> lp:dhis2
> >>>>> https://code.launchpad.net/~dhis2-devs-core/dhis2/trunk<https://code.launchpad.net/%7Edhis2-devs-core/dhis2/trunk>
> >>>>>
> >>>>> Your team DHIS 2 developers is subscribed to branch lp:dhis2.
> >>>>> To unsubscribe from this branch go to
> >>>>>
> https://code.launchpad.net/~dhis2-devs-core/dhis2/trunk/+edit-subscription<https://code.launchpad.net/%7Edhis2-devs-core/dhis2/trunk/+edit-subscription>
> >>>>>
> >>>>> === modified file
> >>>>>
> 'dhis-2/dhis-services/dhis-service-importexport/src/main/java/org/hisp/dhis/importexport/dxf/converter/OrganisationUnitConverter.java'
> >>>>> ---
> >>>>>
> dhis-2/dhis-services/dhis-service-importexport/src/main/java/org/hisp/dhis/importexport/dxf/converter/OrganisationUnitConverter.java
> >>>>>        2010-04-12 21:23:33 +0000
> >>>>> +++
> >>>>>
> dhis-2/dhis-services/dhis-service-importexport/src/main/java/org/hisp/dhis/importexport/dxf/converter/OrganisationUnitConverter.java
> >>>>>        2010-05-19 09:48:29 +0000
> >>>>> @@ -65,6 +65,9 @@
> >>>>>     private static final String FIELD_ACTIVE = "active";
> >>>>>     private static final String FIELD_COMMENT = "comment";
> >>>>>     private static final String FIELD_GEO_CODE = "geoCode";
> >>>>> +    private static final String FIELD_POLYGON_COORDINATES =
> >>>>> "polygonCoordinates";
> >>>>> +    private static final String FIELD_LATITUDE = "latitude";
> >>>>> +    private static final String FIELD_LONGITUDE = "longitude";
> >>>>>     private static final String FIELD_LAST_UPDATED = "lastUpdated";
> >>>>>
> >>>>>     //
> >>>>>
> -------------------------------------------------------------------------
> >>>>> @@ -123,6 +126,9 @@
> >>>>>                 writer.writeElement( FIELD_ACTIVE, String.valueOf(
> >>>>> unit.isActive() ) );
> >>>>>                 writer.writeElement( FIELD_COMMENT, unit.getComment()
> );
> >>>>>                 writer.writeElement( FIELD_GEO_CODE,
> unit.getGeoCode() );
> >>>>> +                writer.writeElement( FIELD_POLYGON_COORDINATES,
> >>>>> unit.getPolygonCoordinates() );
> >>>>> +                writer.writeElement( FIELD_LATITUDE,
> unit.getLatitude()
> >>>>> );
> >>>>> +                writer.writeElement( FIELD_LONGITUDE,
> unit.getLongitude()
> >>>>> );
> >>>>>                 writer.writeElement( FIELD_LAST_UPDATED,
> >>>>> DateUtils.getMediumDateString( unit.getLastUpdated(), EMPTY ) );
> >>>>>
> >>>>>                 writer.closeElement();
> >>>>> @@ -150,6 +156,9 @@
> >>>>>             unit.setActive( Boolean.parseBoolean( values.get(
> FIELD_ACTIVE
> >>>>> ) ) );
> >>>>>             unit.setComment( values.get( FIELD_COMMENT ) );
> >>>>>             unit.setGeoCode( values.get( FIELD_GEO_CODE ) );
> >>>>> +            unit.setPolygonCoordinates( values.get(
> >>>>> FIELD_POLYGON_COORDINATES ) );
> >>>>> +            unit.setLatitude( values.get( FIELD_LATITUDE ) );
> >>>>> +            unit.setLongitude( values.get( FIELD_LONGITUDE ) );
> >>>>>             unit.setLastUpdated( DateUtils.getMediumDate( values.get(
> >>>>> FIELD_LAST_UPDATED ) ) );
> >>>>>
> >>>>>             NameMappingUtil.addOrganisationUnitMapping( unit.getId(),
> >>>>> unit.getName() );
> >>>>>
> >>>>> === modified file
> >>>>>
> 'dhis-2/dhis-support/dhis-support-jdbc/src/main/java/org/hisp/dhis/jdbc/batchhandler/OrganisationUnitBatchHandler.java'
> >>>>> ---
> >>>>>
> dhis-2/dhis-support/dhis-support-jdbc/src/main/java/org/hisp/dhis/jdbc/batchhandler/OrganisationUnitBatchHandler.java
> >>>>>       2010-04-12 21:23:33 +0000
> >>>>> +++
> >>>>>
> dhis-2/dhis-support/dhis-support-jdbc/src/main/java/org/hisp/dhis/jdbc/batchhandler/OrganisationUnitBatchHandler.java
> >>>>>       2010-05-19 09:48:29 +0000
> >>>>> @@ -95,6 +95,7 @@
> >>>>>         statementBuilder.setColumn( "active" );
> >>>>>         statementBuilder.setColumn( "comment" );
> >>>>>         statementBuilder.setColumn( "geocode" );
> >>>>> +        statementBuilder.setColumn( "polygoncoordinates" );
> >>>>>         statementBuilder.setColumn( "latitude" );
> >>>>>         statementBuilder.setColumn( "longitude" );
> >>>>>         statementBuilder.setColumn( "lastUpdated" );
> >>>>> @@ -113,6 +114,7 @@
> >>>>>         statementBuilder.setValue( unit.isActive() );
> >>>>>         statementBuilder.setValue( unit.getComment() );
> >>>>>         statementBuilder.setValue( unit.getGeoCode() );
> >>>>> +        statementBuilder.setValue( unit.getPolygonCoordinates() );
> >>>>>         statementBuilder.setValue( unit.getLatitude() );
> >>>>>         statementBuilder.setValue( unit.getLongitude() );
> >>>>>         statementBuilder.setValue( unit.getLastUpdated() );
> >>>>>
> >>>>>
> >>>>> _______________________________________________
> >>>>> Mailing list: https://launchpad.net/~dhis2-devs<https://launchpad.net/%7Edhis2-devs>
> >>>>> Post to     : dhis2-devs@xxxxxxxxxxxxxxxxxxx
> >>>>> Unsubscribe : https://launchpad.net/~dhis2-devs<https://launchpad.net/%7Edhis2-devs>
> >>>>> More help   : https://help.launchpad.net/ListHelp
> >>>>>
> >>>>>
> >>>>
> >>>>
> >>>>
> >>>> --
> >>>> Cheers,
> >>>> Knut Staring
> >>>>
> >>>> _______________________________________________
> >>>> Mailing list: https://launchpad.net/~dhis2-devs<https://launchpad.net/%7Edhis2-devs>
> >>>> Post to     : dhis2-devs@xxxxxxxxxxxxxxxxxxx
> >>>> Unsubscribe : https://launchpad.net/~dhis2-devs<https://launchpad.net/%7Edhis2-devs>
> >>>> More help   : https://help.launchpad.net/ListHelp
> >>>>
> >>>
> >>>
> >>> --
> >>> --
> >>> Jason P. Pickering
> >>> email: jason.p.pickering@xxxxxxxxx
> >>> tel:+260968395190
> >>>
> >>
> >>
> >>
> >> --
> >> Cheers,
> >> Knut Staring
> >>
> >> _______________________________________________
> >> Mailing list: https://launchpad.net/~dhis2-devs<https://launchpad.net/%7Edhis2-devs>
> >> Post to     : dhis2-devs@xxxxxxxxxxxxxxxxxxx
> >> Unsubscribe : https://launchpad.net/~dhis2-devs<https://launchpad.net/%7Edhis2-devs>
> >> More help   : https://help.launchpad.net/ListHelp
> >>
> >
>
>
>
> --
> Cheers,
> Knut Staring
>
> _______________________________________________
> Mailing list: https://launchpad.net/~dhis2-devs<https://launchpad.net/%7Edhis2-devs>
> Post to     : dhis2-devs@xxxxxxxxxxxxxxxxxxx
> Unsubscribe : https://launchpad.net/~dhis2-devs<https://launchpad.net/%7Edhis2-devs>
> More help   : https://help.launchpad.net/ListHelp
>