I think Billy's on the right track with his answer, but here's
some more explanation and another idea or two.
The axes with names such as LAT153_153 are Ferret-generated
names, created when you save a subset of data in that direction.
If you have data on a grid with an axis LAT and you save data at
one location, for instance "SAVE/Y=35.5 myvar" then the one-point
latitude axis is named with the index range based on the original
axis - here the y=35.5 corresponds index J=153. A range such as
"SAVE/y=35.5:42" would name the axis something like LAT153_162
Then it sounds as if you are trying to append more data which has
a different coordinate in the Y direction, and so the coordinates
in the grid don't match up, hence the error message about
coordinates. If you are doing SAVE/APPEND with a variable name
that is already in the file, then the coordinates of the variable
being saved must match what's in the file, except for time, where
one can append new timesteps along the time axis. The
characteristics of the time axis of the variable being written
must match the time axis in the file, that is, it must have the
same time origin and time units, and the calendar must match. To
append in directions other than time you'd need to pre-define the
output grid when the file is first created, as discussed here in
the documentation.
-Ansley
Dear Ferreters,hope you can help me with this.
I'm using Ferret (v6.842) on a cluster machine. My purpose is to regrid the meridional mass transport (time depth lat lon) into density space (time density lat lon) to compute the transport between some density layers. I'm writing a script based on this (https://github.com/NOAA-PMEL/Ferret/blob/master/jnls/examples/depth_to_density_demo.jnl), which is using zaxreplace. I also found something about auxiliary regridding (https://ferret.pmel.noaa.gov/Ferret/faq/depth-axis-to-density-axis), but it requires a newer version of Ferret.
I'm using the script on several CMIP6 models, and saving the resulting time series as netcdf files for further analysis. I'm including as attachments the script and one of the output files, not the input files being too big. I'm facing two problems, and I can't find anything useful on the archives.
1) First problem: for most models Ferret isn't producing any useful output files, because of error messages like this one:
TMAP ERR: error in line definition
file coords dont match variable coords on axis LAT153_153
As a result, I'm left with empty files. The point is that no LAT153_153 should exist, the variable being a time series. There is nothing special about 153, since other models produce different errors (LAT122_122, LAT124_124, LAT156_156, and so on). What is even more puzzling is that the computed variables are alright, because I can plot them with Ferret. I'm just not able to attach them as netcdf variables, and the resulting file is empty. Why is Ferret defining such axis for a time series?
2) Second problem: for other models Ferret is complaining about the axis transformation. The error in this case is:
**ERROR: regridding: only @ASN regridding between calendar and
non-calendar axes: DENS
No variable is produced after using zaxreplace. I'm puzzled here because I'm defining a vertical axis, and I don't understand why calendars should matter. Is it a problem with zaxreplace? In case, could you provide me the relevant code?
Thanks in advance.
Giorgio
-- Ansley Manke Science Data Integration Group NOAA Pacific Marine Environmental Laboratory 7600 Sand Point Way NE Seattle WA 98115 I am currently teleworking and am available Tue-Wed-Thu.