[Chameleon] Some functional questions

[Bart van den Eijnden (OSGIS)]

Hi,

that's a quite a list, I have numbered them so it is easier to reference.

1) pie charts should be possible with Mapserver, Steve Lime posted an
example about a year ago on the Mapserver list.

2) I don't get what you want exactly but you could duplicate Chameleon
applications and show them in different iframes

3) Not out of the box, there is a widget though in Chameleon which is
called MapNotes. A user can click in the map, add some text and a
shapefile is created in the user's session.

4) This could be done using SLD (Styled Layer Descriptor). There is a
widget which can change colors/patterns for existing classes, but not for
making a new classification AFAIK. It could be done though using
PHP/Mapscript.

5) Yes this should be possible.

6) See 3), for points this is available out of the box, but not for
lines/polygons. Again, it could be created. The Walter Zorn library could
be used for drawing the lines/polygons, or the current ROI tools could be
used.

7) I don't know of any out of the box functionality. Mapscript with GEOS
can do buffering AFAIK. A new widget would need to be created though.

8) This is possible using the MapNotes widget

9) I don't think this is possible. If it would be supported by OGR (check
the drivers page somewehre at www.gdal.org), it could be done. But
probably a driver would need to be created for OGR.

10) CSV is supported by OGR so could be drawn by Mapserver. Look at the
GDAL/OGR page for details. I don't know for sure if this is limited to
points though.

11) Not possible directly, but maybe you can find a stylesheet (XSLT) from
transforming GML to KML. Maybe the Geoserver project has such a stylesheet
available.

12) Yes, no problem.

13) Yes this is possible (widget is called ExpressionBuilder)

Hope this helps.

Best regards,
Bart

> Hi all,
>
> Currently, I'm working on the technical design of an application, for
> which Chameleon/MapServer is considered to be a candidate, together with
> the commercial products of ESRI and Intergraph. The clients would like to
> use open source software, but only if possible.
>
> There are some (ok, quite some... ;) functionalities of which I'm not sure
> they are supported by Chameleon/MapServer Also, I'm not very experienced
> in GIS, so I'm still trying to get a feeling of what is 'normal' GIS
> functionality and what's not. Maybe you can answer my questions?
>
> / possibility to draw data as a bar or circle chart on the (thematical)
> map.
> / possibility to show more than one map at a time.
> / Possibility for users to add their own thematical data. This data should
> only be visible for the user that enters the data and can be removed when
> the user logs off.
> / let the (web)user dynamically change the class borders of the legend.
> / let the user change the legend's colors (the colors of the map)
> dynamically.
> / let the user draw points/lines/polylines on the map, at certain
> coordinates, with the possibility to add (identifying) texts to the
> points. These points/lines/polylines should only be visible for the user
> that enters them and can be removed when the user logs off.
> / draw buffers around the points/lines/polylines, with a user specifyable
> radius.
> / possibility to add text to the points.
> / Import points/polylines in GPX format
> / Import points/polylines in CSV format
> / Export map to Google Earth format (KML)
> / Show aerial imagery behind the map (the map becomes transparent).
> / Let the user select geographical objects by query (value > n and value <
> m)
>
> This is quite a list, but if someone can answer only one, I'm already
> helped.
>
> Cheers,
> Hilbert
>
> --
> Drs. Hilbert Schraal
> Senior developer
>
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