dhis2-devs team mailing list archive

[Knut Staring <knutst@xxxxxxxxx>]

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
>>>>>
>>>>> 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
>>>>>
>>>>> === 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
>>>>> Post to     : dhis2-devs@xxxxxxxxxxxxxxxxxxx
>>>>> Unsubscribe : https://launchpad.net/~dhis2-devs
>>>>> More help   : https://help.launchpad.net/ListHelp
>>>>>
>>>>>
>>>>
>>>>
>>>>
>>>> --
>>>> Cheers,
>>>> Knut Staring
>>>>
>>>> _______________________________________________
>>>> Mailing list: https://launchpad.net/~dhis2-devs
>>>> Post to     : dhis2-devs@xxxxxxxxxxxxxxxxxxx
>>>> Unsubscribe : https://launchpad.net/~dhis2-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
>> Post to     : dhis2-devs@xxxxxxxxxxxxxxxxxxx
>> Unsubscribe : https://launchpad.net/~dhis2-devs
>> More help   : https://help.launchpad.net/ListHelp
>>
>



-- 
Cheers,
Knut Staring