dhis2-devs team mailing list archive

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

Hi Knut,
I think using Postgis would be the easiest way. I am not aware of how
ogr2ogr can do simplification but perhaps.

You can also use ogr2ogr for injection of shape files into Postgres,
instead of shp2pgsql.
Likewise, you can extract Postgis data out of Postgis with ogr2ogr.
With a carefully constructed SQL query, you might be able to do
everything in a single command similar to this
http://lists.maptools.org/pipermail/fwtools/2007-April/000750.html


> I suppose I could do shp2pgsql -> simplify -> pgsql2shp -> ogr2ogr ->
> geojson (thus eliminating the need for Geoserver).


> As for FME, I have not looked at how to include it in scripts (and we only
> have one license for it).

True. I was thinking maybe if you were going to do a one off
conversion, FME would be a good choice. However, for something to
distribute, ogr2ogr combined with Postgis should be able to do this
task .

Regards,
Jason


> Knut
> On Tue, Dec 15, 2009 at 11:54 AM, Jason Pickering
> <jason.p.pickering@xxxxxxxxx> wrote:
>>
>> Hi Knut,
>>
>> This procedure has already been described briefly in the GIS user
>> manual. Take a look there for a start, included below for your
>> convenience.
>
>
>
>>
>> "1.1.2. Production of GeoJSON files with GDAL
>>
>> GDAL is a multi-platform toolkit for the manipulation of geographical
>> data. It is freely available for a wide-range of platforms at
>> http://gdal.org
>>
>> Production of GeoJSON files are straightforward with GDAL. Just
>> execute (on Windows)
>>
>> ogr2ogr.exe -f "GeoJSON" dst_datasource_name src_datasource_name
>>
>> or on Linux
>>
>> ogr2ogr -f "GeoJSON"dst_datasource_name src_datasource_name
>>
>> Replace dst_datasource_name with the path to the destination
>> geographical data file (following the naming convention described
>> above) and src_datasource_name with the source geographical data file.
>> Take note that you may need to specify input and output coordinate
>> systems as described above. "
>
> Can this be extended to include the generalization algorithm?
>
>>
>> Also, FME will do this job very nicely.
>
> True of course, but
>>
>> Regards,
>> Jason
>>
>>
>> On 12/15/09, Knut Staring <knutst@xxxxxxxxx> wrote:
>> > On Tue, Dec 15, 2009 at 11:38 AM, Jason Pickering <
>> > jason.p.pickering@xxxxxxxxx> wrote:
>> >
>> >> Any reason you would not do this with GDAL (ogr2ogr) directly?
>> >
>> >
>> > Maybe lack of knowledge? Can you enlighten me?
>> >
>> > Knut
>> >
>> >
>> >>
>> >>
>> >> On 12/15/09, Knut Staring <knutst@xxxxxxxxx> wrote:
>> >> > I am working on scripts to import shapefiles to PostGIS, simplify
>> >> > them,
>> >> and
>> >> > export to GeoJSON using Geoserver:
>> >> >
>> >> > http://www.openhealthconsortium.org/wiki/doku.php?id=importing_to_ohm
>> >> >
>> >>
>> >
>> >
>> >
>> > --
>> > Cheers,
>> > Knut Staring
>> >
>
>
>
> --
> Cheers,
> Knut Staring
>