[issm-support] data format conversion question..
Morlighem, Mathieu (334H-Affiliate)
Mathieu.Morlighem at jpl.nasa.gov
Wed Jan 16 07:56:21 PST 2013
In the mean time, you said that you could import them into matlab (let's call this variable A).
What you can do is write an exp file using A directly.
A = shaperead('YOURFILE.shp')
You can create a structure B as follows:
B=struct('x',A.X,'y',A.Y,'density',1);
(forget about 'density',1 it does not mean anything but it is required by expwrite).
Then you can write your expfile:
expwrite(B,'domain.exp');
You can check your domain with:
expdisp('domain.exp');
let us know if it works (or not)
Mathieu
--
Mathieu Morlighem
Assistant Project Scientist
Department of Earth System Science
University of California, Irvine
Croul Hall, Irvine, CA 92697-3100
(949) 824-1353 (UCI office)
(818) 354-4134 (JPL office)
(626) 429-5780 (cell)
Mathieu.Morlighem at uci.edu<mailto:Mathieu.Morlighem at uci.edu>
On Jan 15, 2013, at 9:55 PM, "Larour, Eric (385J)" <eric.larour at jpl.nasa.gov<mailto:eric.larour at jpl.nasa.gov>> wrote:
I'm going to bounce that one to John Schiermeier, who wrote converters
from shape
files to kml, and from kml to exp. Theoretically, it should be possible to
use our
code to do this.
John?
Eric L.
On 1/15/13 9:51 PM, "djl22" <djl22 at psu.edu<mailto:djl22 at psu.edu>> wrote:
Hi,
I had a small question about data format conversion. I actually have a
shapefile created in ARCGIS that defines a regions bounded by polygons.
I know I can get them imported into matlab, but I want to use them in a
similar way as you did in your Jakobshavn example where you create an
Argus file to define regions for shear margin softening.
The issue is converting my shapefile into the Argus format without
retracing the shapefile using exptool (which is possible, the primary
reservation is that some of my polygon geometry is a bit complex in
spots), or without having to buy ARGUS ONE personally.
Any ideas?
Thank you very much.
Best
On 12/31/2012 5:18 PM, Larour, Eric (385J) wrote:
Derrick,
I ran your example and everything went fine. So the only thing right now
I can think
of is that your model is not in sync with svelint (i.e. svelint is not a
vertex based vector of
size (md.mesh.numberofvertices,1)). To check on that, could you send me
the results of the following?
md.mesh
whos x y svelocity svelint
Thanks!
Eric L.
On 12/31/12 1:53 PM, "Larour, Eric (385J)" <eric.larour at jpl.nasa.gov<mailto:eric.larour at jpl.nasa.gov>>
wrote:
Derrick,
I'm also puzzled as to why bang is giving you an error. I am right now
working
on reproducing the bug from your procedure document. Will keep you
posted
as soon
as I find the bug. Should not be long.
For further reference, please include issm-support at issm.ess.uci.edu<mailto:issm-support at issm.ess.uci.edu> in
your reply
all, so other ISSM folks can also help you :)
Eric L.
On 12/31/12 12:17 AM, "djl22" <djl22 at psu.edu<mailto:djl22 at psu.edu>> wrote:
Hi,
I think I found a way through it. I tried working with the original
data, which provides surface velocity over the entire Greenland ice
sheet projected in polar stereographic. I used geotiffread to import
the
GEOTIFF image. I used exptool to draw my domain as a sub-region
(Jakobshavn area) from the imported image and set the initial
resolution
of my mesh at 2km (2000m). The output mesh looks about right. I then
extract the pixel center coordinates using the pixcenters command:
info=geotiffinfo(filename);From
[x,y] = pixcenters(info);
This gets my coordinates for pixel centers. I then have to flip my (y)
coordinates because the InterpFromGridToMesh command complains that
the
values should be decreasing. After doing so I run the
InterpFromGridToMesh command and here things get odd. I notice that in
your examples the velx and vely variables in your Searise and
jakobshavn
examples are entered in the InterpFromGridToMesh command as the
transpose of these variables, is this correct? (i.e.
vx=InterpFromGridToMesh(x1,y1,velx',md.mesh.x,md.mesh.y,0);).
If I enter my velocity grid as such then I get an error. if I enter
without the transpose the command seems to work, but then I get an odd
message when I use the output from the Interp command in the following
bamg command. I get:
Anisotropic mesh adaptation
Error message: 'field' should have 930 rowsError using BamgMesher
At this point I'm lost as to why its not working. When I attempted to
run your Searise example as indicated, I ended up with the same exact
error in running bamg (I ran the lines of code provided directly from
the example). I also go tthis error when I ran the Searise example:
Error message: Input parameter of class single not supported yetError
using InterpFromGridToMesh
when I ran
vx=InterpFromGridToMesh(x1,y1,velx',md.mesh.x,md.mesh.y,0);...in this
case I converted the input variables x1, y1 and velx, vely to double
(x1=double(x1), etc...) was this necessary to get it to work? The
command worked after doing this which means ISSM could not recognize
the
data type "single" as oppose to "double"
at any rate, i'm now stuck at bamg where I'm attempting to use the
velocity i assume were interpolated to my initial mesh within my
custom
domain to refine my initial mesh which would ideally create finer mesh
grids near the margins of Jakobshavn than outside of the margins....
Thanks so much for the assistance....
On 12/29/2012 3:04 AM, Larour, Eric (385J) wrote:
Dear Derrick,
I think the issue is that when you plotted your surface velocities in
matlab (before calling exptool
on it), you did not specify the x and y coordinates of your image.
Typically, in matlab, one does:
imagesc(velocity) where velocity is a matrix. This will get you
coordinates in scene coordinates.
For your example, what you need to do is:
imagesc(x,y,velocity),
where x=0:(xmax-xmin)/m:xmax and
y=0:(ymax-ymin)/n:ymax
and m,n is the size of the velocity matrix.
If you do this, you will recover from exptools the true vertex
coordinates.
Tell me how it goes!
Thanks!
Eric L.
On 12/28/12 11:58 PM, "Derrick Lampkin" <djl22 at psu.edu<mailto:djl22 at psu.edu>> wrote:
Greetings,
I recently attended the ISSM workshop and found it useful. I'm
attempting
to use the system to model a system in the Jakobshavn outlet basin.
I
have been using your Jakobshavn example as a template. The exception
is
I'm using a base of surface velocity data derived from NSIDC
(Joughin
data set). I have imported a surface velocity grid as GEOTIFF into
matlab
and I use the exptool to draw the outline of my domain on top of
this
base map. The map is in the polar stereo graphic projection but
when I
create the initial mesh using triangle at the nominal resolution of
the
data (500 m), the grid spacing was not nearly as dense as expected.
I
inspected the domain file I created and the vertices coordinates are
in
scene coordinates (row/column) values and not the projected
coordinates ,
therefore the mesh spacing are not reasonable and do not correspond
to
the specified resolution I indicate in the triangle command. How
might
I
fix this issue?
Thanks
derrick j lampkin
__________________
research professor
institute of arctic and alpine research
university of colorado-boulder
__________________
email: djl22 at psu.edu<mailto:djl22 at psu.edu>
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derrick j lampkin
__________________
research professor
institute of arctic and alpine research
university of colorado-boulder
adjunct
department of geoscience
pennsylvania state university
__________________
email: djl22 at psu.edu<mailto:djl22 at psu.edu>
web: http://www.geosc.psu.edu/academic-faculty/lampkin-derrick
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--
derrick j lampkin
__________________
research professor
institute of arctic and alpine research
university of colorado-boulder
adjunct
department of geoscience
pennsylvania state university
__________________
email: djl22 at psu.edu<mailto:djl22 at psu.edu>
web: http://www.geosc.psu.edu/academic-faculty/lampkin-derrick
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