Hi Radim
I don't have a strong opinion about wether to show nodata value in
transparency list in the GUI or not. After all, the renderer sees only
the transparency list and does not care which of them is the nodata
value (except for the decision if the renderer is using transparency or
not).
If you think it is a big useability plus to hide that from the user,
that's ok for me.
we have to add support for it in GUI (set color)
and renderers. Currently there is no such support.
There is. If you e.g. have -9999 as nodata value and configure
singleband pseudocolor renderer to render this as red, you can do it in
the dialog.
There are other standard ways to highlight nodata:
- set background color
- set nodata pixels to a different value (r.null) and assign a color to it
Yes, but it is less convenient. But nodata analysis does not happen to
often for me, so I could live with a workaround.
Regards,
Marco
Am 23.08.2012 13:59, schrieb Radim Blazek:
On Thu, Aug 23, 2012 at 8:15 AM, Marco Hugentobler
<[email protected]> wrote:
Hi Radim
Nodata should be rendered transparent in most cases. But it could also be
possible you want to render it differently. E.g. the interpolation plugin
writes nodata value in case it encounters numerical problems. Then it is
useful to have the nodata values coloured to see where problems happened.
There are other standard ways to highlight nodata:
- set background color
- set nodata pixels to a different value (r.null) and assign a color to it
If you and other users insist that it should be possible to render
nodata with a color, we have to add support for it in GUI (set color)
and renderers. Currently there is no such support.
Radim
Maybe there are other use cases as well.
Regards,
Marco
Am 22.08.2012 17:49, schrieb Radim Blazek:
Hi,
does anybody know why raster no data value is automatically added to
transparency list in properties dialog? It makes no sense IMO. No data
values are always rendered as transparent, no need to define them also
in transparent list.
Radim
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Dr. Marco Hugentobler
Sourcepole - Linux & Open Source Solutions
Weberstrasse 5, CH-8004 Zürich, Switzerland
[email protected] http://www.sourcepole.ch
Technical Advisor QGIS Project Steering Committee
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Dr. Marco Hugentobler
Sourcepole - Linux & Open Source Solutions
Weberstrasse 5, CH-8004 Zürich, Switzerland
[email protected] http://www.sourcepole.ch
Technical Advisor QGIS Project Steering Committee
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