On 13/10/2016 11:14 AM, Thomas Adams wrote:
Duncan,
Oh, to be sure, with a fair amount of work, you're probably correct that
one could mash up something. Here are some examples:
http://www.illinoisfloods.org/documents/2013_IAFSM_Conference/Conference_Presentations/5C-1_HEC-GeoRAS_Part1.pdf
<--- lots of graphics
http://rivergis.com/
also...
http://www2.egr.uh.edu/~aleon3/courses/Transient_flows/Tutorials/Geo_RAS/georastutorial.pdf
-- pages 35->
https://www.crwr.utexas.edu/reports/pdf/1999/rpt99-1.pdf -- pages 70->
(figures 4-17, 4-18), p. 147
Thanks. I guess it's up to Marna to say whether any of those figures
are like what she wants to produce from her data.
Duncan Murdoch
Best,
Tom
On Thu, Oct 13, 2016 at 9:20 AM, Duncan Murdoch
<murdoch.dun...@gmail.com <mailto:murdoch.dun...@gmail.com>> wrote:
On 13/10/2016 8:35 AM, Thomas Adams wrote:
All,
Very respectfully, there are no R packages that can do what
Marna desires.
I would guess that's not literally true, in that there are several
graphics packages that are very flexible. You could well be right
that there are none that are designed specifically for this purpose,
so she's probably going to have to do some work to get what she wants.
His/Her data, undoubtably, comes from a 1-D hydraulic model
simulation -- where output is generated at channel
cross-sections -- representing the sloping water surface
elevation of the centerline of flow in a stream or river. With
mapping software for such problems, the assumption is made that
the water surface intersects the topography (within or beyond
the stream channel) perpendicular to the direction of flow.
Hydrodynamically, this is generally not correct, but it's a
reasonable approximation. To do this, typically, the topography
-- in the from of a raster digital elevation model (DEM) -- is
converted to a triangular irregular network (TIN) to facilitate
the creation of a smoother line of intersection between the
water surface and topography. Because, the water surface slopes
in a downstream direction, contour lines are crossed. Hydraulic
modeling software usually is accompanied by this mapping
capability, such as with HEC-RAS with RAS-Mapper, developed by
the US Army Corps of Engineers, or with HEC-GeoRAS, which
requires ESRI ARC GIS; but, there is also a QGIS plugin module
that can do this, I believe. These software packages do
facilitate representing the flow in 3D.
Do you know any sample figures online that would show the type of
graph that is usually used here?
Duncan Murdoch
Tom
On Wed, Oct 12, 2016 at 6:12 PM, David Winsemius
<dwinsem...@comcast.net <mailto:dwinsem...@comcast.net>
<mailto:dwinsem...@comcast.net <mailto:dwinsem...@comcast.net>>>
wrote:
> On Oct 12, 2016, at 4:28 AM, Duncan Murdoch
<murdoch.dun...@gmail.com <mailto:murdoch.dun...@gmail.com>
<mailto:murdoch.dun...@gmail.com
<mailto:murdoch.dun...@gmail.com>>> wrote:
>
> On 12/10/2016 4:49 AM, Marna Wagley wrote:
>> Hi R Users,
>> Is it possible to visualize river flow in 3D (latitude,
longitude with
>> respect to depth)?
>> The example of my data looks like. Any suggestions?
>>
>>> dat1
>> long lat depth flow
>> 1 1015.9 857 1.00 1.50
>> 2 1015.9 857 1.25 1.23
>> 3 1015.9 857 0.50 2.00
>> 4 1015.9 858 0.10 1.95
>> 5 1015.9 858 0.20 1.50
>> 6 1025.0 858 0.30 1.20
>> 7 1025.0 858 0.40 0.50
>> 8 1025.0 858 0.35 0.70
>> 9 1025.0 858 0.24 1.20
>>
>> Thanks for your help.
>
> It may be, but it's hard to give a nice looking graphic of
that
small dataset. You could try the rgl package and use plot3d to
show spheres with radius depending on the flow rate, for example
>
> plot3d(cbind(long, lat, depth), type="s", col="blue",
radius=flow/5)
A complementary option is to install the plot3D package which I
see also has a plot3Drgl "co-package". The advantage to this
option is the association with beautiful modeling packages that
Karline Soetaert, Peter M. J. Herman, and Thomas Petzoldt have
been offering to ecologists for the last decade. (Packages:
deSolve, marelac, seacarb, AquaEnv) A lot of her work has
been on
flows within systems.
I usually think of "flows" in rivers as being vector fields
in an
incompressible fluid (water) with 6 components per point,
but you
can also think of them as being scalar state variables. So I
suppose you could be modeling something other than mass flows.
(See Package::ReacTran for the R portal to that mathematical
world.)
Best;
David Winsemius
>
> Duncan Murdoch
>
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