dhis2-devs team mailing list archive

[Jason Pickering <jason.p.pickering@xxxxxxxxx>]

OK. I think it is a very basic start, but much of the code should
already be there in the functional prototype, and should be able to be
simplified significantly as we are not dealing with OLAP but rather
static table. There were a number of deficiencies in the prototype,
which I have documented in different emails from the past. I will try
and dig these out and provide more detail on what the desired spec
should be.



On Wed, Nov 11, 2009 at 9:31 PM, Knut Staring <knutst@xxxxxxxxx> wrote:
> On Wed, Nov 11, 2009 at 6:18 PM, Jason Pickering
> <jason.p.pickering@xxxxxxxxx> wrote:
>>
>> yeah, this is going to be a problem for sure.
>>
>> We need to get a blueprint written for the use of WMS layers where the
>> SLD is generated/used by DHIS.
>
> Started one here (with wiki page). Please expand.
> https://blueprints.launchpad.net/dhis2/+spec/gis-sld-generator-wms
> k
>
>>
>> GetFeatureInfo capabilities requests should allow similar behaviour of
>> the click and get feature info behaviour we have now (hover is also
>> possible).
>>
>> Lets tackle this on Friday as well.
>>
>>
>>
>> On Wed, Nov 11, 2009 at 6:14 PM, Knut Staring <knutst@xxxxxxxxx> wrote:
>> > Not too promising:
>> > "If you expect the number of your point to grow beyond ~100, you'll
>> > definitely be better off using WMS (especially if your users are on
>> > Internet
>> > Explorer)"
>> >
>> > http://openlayers.org/pipermail/users/2009-March/010997.html
>> > On Wed, Nov 11, 2009 at 5:48 PM, Knut Staring <knutst@xxxxxxxxx> wrote:
>> >>
>> >> Given that your json file is less than 600 k, it seems to me that it is
>> >> the number of objects in the DOM that are a problem rather than the
>> >> file
>> >> size...which would not be the case with WMS of course, but then, less
>> >> immediate interaction
>> >>
>> >> On Wed, Nov 11, 2009 at 5:38 PM, Knut Staring <knutst@xxxxxxxxx> wrote:
>> >>>
>> >>> On Wed, Nov 11, 2009 at 5:21 PM, Jason Pickering
>> >>> <jason.p.pickering@xxxxxxxxx> wrote:
>> >>>>
>> >>>> In my spare time sitting in a long meeting, I have been taking  a
>> >>>> look
>> >>>> at the GIS module in a bit more detail. I have a few comments.
>> >>>>
>> >>>> My source data file is here..
>> >>>>
>> >>>>
>> >>>>
>> >>>> http://zamdhis.dynalias.org/geoserver/wfs?request=GetFeature&typename=who:HFC_GPS_ZAMBIA&outputformat=json&srsname=EPSG:4326
>> >>>>
>> >>>> This is the GeoJSON output of facilities in Zambia (those that are
>> >>>> available).
>> >>>>
>> >>>> Now, because we are using the DHIS 1.4 naming convention, where a
>> >>>> prefix of the province has been added to the name of the facility.
>> >>>> The
>> >>>> basic problem here is that there are differences between the names of
>> >>>> the facilities in the DB and the names in the GeoJSON files. Luckily,
>> >>>> there is a common code that would allow the data to be matched, but I
>> >>>> can only match the JSON file on the name of the facility. Possible
>> >>>> solutions? Change the source file is an option. Allowing matching on
>> >>>> another field in the database would be a better option perhaps.
>> >>>>
>> >>>> Also, since there are some 1500 points or so in the file, the browser
>> >>>> "greys out" sometimes, which seems really to be a performance issue.
>> >>>> Obviously, we cannot simplify point files, which can speed up the
>> >>>> performance of polygon layers in the client. Thoughts?
>> >>>
>> >>> You can actually simplify even points by including fewer decimals for
>> >>> each coordinate. That may be acceptable in some situations, but
>> >>> probably
>> >>> quite undesirable in others - and I think it underscores that we need
>> >>> to
>> >>> bring the OpenHealth-FP solution of generating SLDs to feed to
>> >>> Geoserver
>> >>> back in as a supplement for cases where GeoJSON are not suitable. It
>> >>> would
>> >>> be great to avoid that, but not sure if it is possible when we deal
>> >>> with
>> >>> serious amounts of data.
>> >>> Knut
>> >>>
>> >>>>
>> >>>> Regards,
>> >>>> jason
>> >>>>
>> >>>> _______________________________________________
>> >>>> Mailing list: https://launchpad.net/~dhis2-devs
>> >>>> Post to     : dhis2-devs@xxxxxxxxxxxxxxxxxxx
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>> >>>
>> >>>
>> >>>
>> >>> --
>> >>> Cheers,
>> >>> Knut Staring
>> >>
>> >>
>> >>
>> >> --
>> >> Cheers,
>> >> Knut Staring
>> >
>> >
>> >
>> > --
>> > Cheers,
>> > Knut Staring
>> >
>
>
>
> --
> Cheers,
> Knut Staring
>