dhis2-devs team mailing list archive

[Bob Jolliffe <bobjolliffe@xxxxxxxxx>]

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
>