dhis2-devs team mailing list archive

[Knut Staring <knutst@xxxxxxxxx>]

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
> Unsubscribe : https://launchpad.net/~dhis2-devs
> More help   : https://help.launchpad.net/ListHelp
>



-- 
Cheers,
Knut Staring