mchitre
commented
4 years ago Can you post the arlpy code that you used?
Closed patel999jay closed 4 years ago
mchitre
commented
4 years ago Can you post the arlpy code that you used?
patel999jay
commented
4 years ago Here is the code that i used,
import arlpy.uwapm as pm
import arlpy.plot as plt
import numpy as np
env = pm.create_env2d()
pm.print_env(env) # to check env
ssp = [
[0, 0.0022477890249762906],
[1446.0123291015625, 1452.5137939453125],
[1463.50646209716797, 1473.13202667236328],
[1466.33708953857422, 1477.57839965820312],
[1469.17899703979492, 1480.42838668823242],
[1472.03192138671875, 1483.28749084472656],
[1474.89564895629883, 1486.15559768676758],
[1477.76937103271484, 1489.03192901611328],
[1480.65291595458984, 1491.91645812988281],
[1483.54705810546875, 1494.80963134765625],
[1486.45201873779297, 1497.71190643310547],
[1489.36491394042969, 1500.62077331542969],
[1492.28920745849609, 1503.53911590576172],
[1495.223388671875, 1506.46572875976562],
[1498.17044067382812, 1509.40312957763672],
[1501.11749267578125, 1512.34053039550781],
[1504.07640838623047, 1515.28792572021484],
[1507.049560546875, 1518.247314453125],
[1510.02271270751953, 1521.20670318603516],
[1513.00946044921875, 1524.17765045166016],
[1516.00753784179688, 1527.15822982788086],
[1519.005615234375, 1530.13880920410156],
[1522.01885986328125, 1533.1323127746582],
[1525.040771484375, 1536.13320159912109],
[1528.06268310546875, 1539.13409042358398],
[1531.10107421875, 1542.14926147460938],
[1534.14564514160156, 1545.1697883605957],
[1537.19021606445312, 1548.19031524658203],
[1540.25243377685547, 1551.22611999511719],
[1543.31857299804688, 1554.26531982421875],
[1546.38471221923828, 1557.30451965332031],
[1549.46927642822266, 1560.36004638671875],
[1552.55568313598633, 1563.41720581054688],
[1555.64208984375, 1566.474365234375],
[5101, 1566.474365234375]
]
bathy = [
[0,5100],
[0.213841, 270.083],
[0.31033, 270.753],
[0.654562, 271.326],
[1.01966, 271.259],
[1.09659, 271.734],
[1.53731, 271.909],
[1.72898, 272.099],
[1.97803, 272.138],
[2.41875, 273.279],
[2.43831, 274.131],
[2.85947, 275.925],
[3.14764, 276.604],
[3.3015, 276.786],
[3.74222, 276.807],
[3.85566, 276.902],
[3.91173, 277.162],
[1000, 277.165]
]
env = pm.create_env2d(
depth=bathy,
soundspeed=ssp,
bottom_soundspeed=1450,
bottom_density=1200,
bottom_absorption=1.0,
tx_depth=50
)
pm.print_env(env) # To check new bathy
pm.plot_env(env, width=900) #to plot env
pm.plot_ssp(env) #to plot env
#I think code runs fine till here, not calculating rays
rays = pm.compute_eigenrays(env) #computer eigenrays
pm.plot_rays(rays, env=env, width=900)
rays = pm.compute_rays(env) #compute rays
pm.plot_rays(rays, env=env, width=900)#complains about file missing
---------------------------------------------------------------------------
FileNotFoundError Traceback (most recent call last)
<ipython-input-128-dbc7cd561bf0> in <module>
----> 1 rays = pm.compute_rays(env)
2 pm.plot_rays(rays, env=env, width=900)
~/my_project_arlpy/my_project_env/lib/python3.6/site-packages/arlpy/uwapm.py in compute_rays(env, tx_depth_ndx, model, debug)
345 if debug:
346 print('[DEBUG] Model: '+model_name)
--> 347 return model.run(env, rays, debug)
348
349 def compute_transmission_loss(env, tx_depth_ndx=0, mode=coherent, model=None, debug=False):
~/my_project_arlpy/my_project_env/lib/python3.6/site-packages/arlpy/uwapm.py in run(self, env, task, debug)
569 fname_base = self._create_env_file(env, taskmap[task][0])
570 if self._bellhop(fname_base):
--> 571 results = taskmap[task][1](fname_base)
572 else:
573 results = None
~/my_project_arlpy/my_project_env/lib/python3.6/site-packages/arlpy/uwapm.py in _load_rays(self, fname_base)
726
727 def _load_rays(self, fname_base):
--> 728 with open(fname_base+'.ray', 'rt') as f:
729 f.readline()
730 f.readline()
FileNotFoundError: [Errno 2] No such file or directory: '/tmp/tmpjln3_ui3.ray'
Do i miss something ? Thanks in advance for your help.
mchitre
commented
4 years ago Thanks. This helps. Will try to reproduce it.
harivnkochi
commented
4 years ago It could be the same as this issue: https://github.com/org-arl/arlpy/issues/40
mchitre
commented
4 years ago Just tested this ... the problem is related to the resolution at which the bathymetry is specified. When rounded off to 4 decimal places in km, 2.41875 and 2.43831 become 0.0024, and Bellhop doesn't like repeated points.
This could be fixed by changing the %0.4f in uwapm to increase number of decimal places. But I don't see the point. The simulation doesn't have the fidelity to deal with such small variations, so my suggested fix for @patel999jay is to provide the bathymetry at a courser resolution (no finer than 0.1 m spacing).
mchitre
commented
4 years ago Changing to 6 decimal places in latest release to avoid this problem.
I parsed custom env to module but it failed to regenerate simulation scenarios. I had successfully tested the same scenario files with bellhop using matlab, works perfectly fine. Also is there any way to parse non-monotonic ssp ? I am using Bathmetry from GEBCO 2019. Any help would be appreciated.
Here is the example env file that i use.