[GRASS-dev] [GRASS-SVN] r62845 - in grass/trunk/scripts: . d.shadedmap r.shadedmap

Sun Nov 30 21:18:31 PST 2014

On Sun, Nov 30, 2014 at 11:37 PM, Michael Barton <Michael.Barton at asu.edu>
wrote:

>  My thinking was that a relief map simulates the appearance of topographic
> relief through the use of ‘hill shading’ (to use the ESRI term).
>
> BTW, hill shading is not as bad term as other ESRI terms, the main
problems is that it is really just ESRI term. It seems to me that nobody
else is using it.

>  You can “shade” the relief map made with r.relief or other psuedo relief
> maps, like an aspect map (can you shade a slope map in this way? Not sure
> what it would tell you visually) with a color map of some kind (hence
> r.shaded.relief). Or you can “drape” the color map over the relief
> map—perhaps “r.color.drape”.
>
>
I'm not sure if I follow the first part. But I don't like the drape think
as a name and as a parameter (d.shade has now drapemap, I would like to get
rid of it). I know what drape would mean with 3D surface (e.g. in NVIZ) but
I have no idea what this mean with elevation and its shade. It always seems
to me that I'm draping the shade over the elevation (as it would draping do
in 3D) but it is the other way around.

Slope shading or whatever we want to call it is possible in some way.
Higher slopes are darker.

r.colors -n -e map=slope color=grey
d.shade drapemap=elevation reliefmap=slope brighten=99

See also "red relief image maps" [1] but slope is there used as color, not
shade. I'll try to add both examples to manual some time later.

[1]
https://groups.google.com/forum/?hl=en#!searchin/lastools/grass/lastools/_Zv6ublzeSE/SRCa_WQ8gusJ

>  There are other kinds of image fusion for sure. The goal is to use names
> that users can easily understand. If d.shade can shade something other than
> a relief map of some kind, then perhaps d.shade is best. If it mainly is
> for shading relief maps maps, d.shaded.relief might be better.
>

It's mainly for relief but it's general. If there is no strong opposition I
would stick to d.shade but yes I consider this as important because it
seemed to me that it is hard find relief shading functionality in GRASS
(and QGIS too actually). Nothing was backported yet.

And what about the following?

- d.shade drapemap=elevation reliefmap=slope
+ d.shade color=elevation shade=slope

On Sun, Nov 30, 2014 at 11:37 PM, Michael Barton <Michael.Barton at asu.edu>
wrote:

>  My thinking was that a relief map simulates the appearance of topographic
> relief through the use of ‘hill shading’ (to use the ESRI term).
>
>  You can “shade” the relief map made with r.relief or other psuedo relief
> maps, like an aspect map (can you shade a slope map in this way? Not sure
> what it would tell you visually) with a color map of some kind (hence
> r.shaded.relief). Or you can “drape” the color map over the relief
> map—perhaps “r.color.drape”.
>
>  There are other kinds of image fusion for sure. The goal is to use names
> that users can easily understand. If d.shade can shade something other than
> a relief map of some kind, then perhaps d.shade is best. If it mainly is
> for shading relief maps maps, d.shaded.relief might be better.
>
>  Michael
>            ____________________
>  C. Michael Barton
>  Director, Center for Social Dynamics & Complexity
>  Professor of Anthropology, School of Human Evolution & Social Change
> Head, Graduate Faculty in Complex Adaptive Systems Science
>  Arizona State University
>
>  voice:  480-965-6262 (SHESC), 480-965-8130/727-9746 (CSDC)
> fax: 480-965-7671 (SHESC),  480-727-0709 (CSDC)
>  www: http://www.public.asu.edu/~cmbarton, http://csdc.asu.edu
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>  On Nov 30, 2014, at 7:54 PM, Vaclav Petras <wenzeslaus at gmail.com> wrote:
>
>
> On Sun, Nov 30, 2014 at 8:12 PM, Michael Barton <Michael.Barton at asu.edu>
> wrote:
>
>> My idea is that changing r.shaded.relief -> r.relief allows us to use
>> r/d.shaded.relief for relief maps that are colored by another variable
>> (elevation, land-cover, etc).
>>
>>   I don't think this would be a good idea. r.relief (former
> r.shaded.relief) creates "shade from the (terrain) relief". r.shade (former
> r.shadedmap, and d.shade) allows to "put the shade on a colored/colorful
> raster" where both shade and raster can be anything. Shade can be e.g.
> aspect, slope or shade derived from the relief. I know this is probably
> clear but his was my thinking.
>
>  I didn't though about r.shade and r.relief names before you suggested
> them and I'm not 100% satisfied with r.relief because it is in fact not
> relief but shade from relief. However, I like the new names because they
> are short, there is no problem with using or not using the dot between
> words and they are distinct from each other.
>
>   Michael
>>        ____________________
>>  C. Michael Barton
>>  Director, Center for Social Dynamics & Complexity
>>  Professor of Anthropology, School of Human Evolution & Social Change
>> Head, Graduate Faculty in Complex Adaptive Systems Science
>>  Arizona State University
>>
>>  voice:  480-965-6262 (SHESC), 480-965-8130/727-9746 (CSDC)
>> fax: 480-965-7671 (SHESC),  480-727-0709 (CSDC)
>>  www: http://www.public.asu.edu/~cmbarton, http://csdc.asu.edu
>>
>>
>>
>>   On Nov 30, 2014, at 5:50 PM, grass-dev-request at lists.osgeo.org wrote:
>>
>>   *From: *Vaclav Petras <wenzeslaus at gmail.com>
>>  *Cc: *GRASS developers list <grass-dev at lists.osgeo.org>
>>   *To: *Markus Neteler <neteler at osgeo.org>
>>  *Date: *November 30, 2014 at 5:31:35 PM MST
>>   *Subject: **Re: [GRASS-dev] [GRASS-SVN] r62845 - in
>> grass/trunk/scripts: . d.shadedmap r.shadedmap*
>>
>>
>>
>>
>>  On Sat, Nov 29, 2014 at 9:43 AM, Vaclav Petras <wenzeslaus at gmail.com>
>> wrote:
>>
>>>
>>>
>>>  On Sat, Nov 29, 2014 at 9:30 AM, Markus Neteler <neteler at osgeo.org>
>>> wrote:
>>>
>>>> On Sat, Nov 29, 2014 at 12:37 AM, Vaclav Petras <wenzeslaus at gmail.com>
>>>> wrote:
>>>> >
>>>> > On Fri, Nov 28, 2014 at 5:40 PM, Michael Barton <
>>>> Michael.Barton at asu.edu>
>>>> > wrote:
>>>> >>
>>>> >> Probably nothing to be done about this since r.shaded.relief goes
>>>> back a
>>>> >> long time. But a more sensible renaming would have the script now
>>>> called
>>>> >> r.chaded.relief renamed to simply r.relief. Then the modules that
>>>> drape a
>>>> >> colored map onto a relief map could be called x.shaded.relief,
>>>> >> x.shadedrelief, or something like that.
>>>> >>
>>>> > That's an interesting option. I'm not sure if I like it but it's worth
>>>> > exploring. If we go even further we get:
>>>> >
>>>> > r.shaded.relief -> r.relief
>>>> > r.shadedmap -> r.shade
>>>> > d.shadedmap -> d.shade
>>>>
>>>> ... along with:
>>>> - r.blend
>>>>
>>>> Yes, I like this list better than the current names of discussed
>>>> modules.
>>>>
>>>>   So, if you like it, I can like it too and I will change it hopefully
>>> soon. Just to be sure: including r.shaded.relief -> r.relief?
>>>
>>>
>> r.shaded.relief -> r.relief
>> r.shadedmap -> r.shade
>> d.shadedmap -> d.shade
>>
>>  Done in r63305 with few other improvements.
>>
>> Now I'm not sure with [rd].shade parameters. reliefmap and drapemap are
>> not particularly explanatory. My idea was shade and color which is better
>> when shade=slope compared to relief=slope. color=elevation is also quite
>> understandable but of course it is quite unexpected that the color option
>> is a raster map.
>>
>>  There is also one detail I'm not sure about. r.relief might be now
>> missing one keyword and that is "shaded relief". "relief" should be there
>> too but having also "shaded relief" distinguishes it from things like
>> "local relief (model)".
>>
>> http://trac.osgeo.org/grass/changeset/63305
>>
>>    Vaclav
>>>
>>>  Markus
>>>>
>>>
>>>
>>
>>
>>
>> _______________________________________________
>> grass-dev mailing list
>> grass-dev at lists.osgeo.org
>> http://lists.osgeo.org/mailman/listinfo/grass-dev
>
>
>
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