On 09/20/2011 07:08 PM, J. Holden wrote:
> This is somewhat off-topic to FlightGear, so I apologize - but I
> respond to John Denker: Having looked over what you are trying to do,
> I strongly recommend using QGIS with the GRASS plugin.
> Very rarely do I use any of GRASS' built-in visualization programs -
> and very rarely do I use any of QGIS' built-in geospatial functions -
> but QGIS is the best program I've found to visualize GRASS data at
> the moment (with the possible, rare, exception of NVIZ).
> In fact, I believe the whole GRASS d.mon was rewritten as of GRASS 7
> and now works differently (and hopefully better). I think most of the
> GRASS display functions were very, very old.

Yes, that helps.  Thanks for the clue.

One nice thing about GRASS is that it is very modular.  In
particular its backend computational features are independent 
of its frontend visualization features.

The QGIS frontend graphics are orders of magnitude faster than
the GRASS frontend graphics.

Also QGIS has a feature called "recompute CRS on the fly" that
simplifies a lot of things.  It's nice to see a little bit of
sanity in the world.

Here are some questions you might be able to help me with, if
you would be so kind.  Off-list answers would be fine, although 
I suspect I'm not the only person who is interested:

1) GRASS has a "drape" feature implemented by d.his that sets
 the intensity from one raster and the hue from from another,
 which is a very nice way of combining slope information and
 elevation information into one image.  It's not obvious how
 to achieve the "drape" effect in QGIS ... with or without 
 involving GRASS.  What's the trick?

2) GRASS has a "catlist" feature implemented by d.rast that
 makes it easy to display only a certain range of values,
 e.g. everything from 3000 feet on up.  This is particularly
 slick in conjunction with item (1) above.  I can always do
 this with r.mapcalc, but I was wondering if there might be
 a convenient way to do it on-the-fly.

3) I suspect that doing reprojections on the the fly only
 works for vector data.  I tried it with raster data, 
 expecting to see either a resulting image or an error 
 message, but saw neither.  Is there something I'm missing?

4) When defining a colormap, there does not appear to be
 any way of controlling transparency on a level-by-level
 basis.  Am I overlooking something, or is this an actual

All the data continuously generated in your IT infrastructure contains a
definitive record of customers, application performance, security
threats, fraudulent activity and more. Splunk takes this data and makes
sense of it. Business sense. IT sense. Common sense.
Flightgear-devel mailing list

Reply via email to