DePSI projection settings update

[dcbarcham]

Set changes to networking;

• network-method: spider
• psc-selection-gridsize: 200
• max-arc-length: 5000

Other changes;

• map-to-vert: 0

Not sure if you have encountered this but the strapdown code from Wietske makes use of both the Line of sight (LoS) and Projection onto vertical (PoV), her files suggest that she takes LoS as a base and then manually appends a PoV in a separate script. So strapdown code with the process of updating normal and transversal components from 1st order estimations needs both, you already mentioned that an extra column would cause issues, so some other method.
Sorry if you knew all that and it wasn't a problem but thought i should mention it just in case.

Looking at the networking plots the descending tracks appear to be rotated 180 degrees while the ascending tracks are oriented properly, Freek suggested this is likely down to a parameter somewhere which is recognising the Dsc as Asc and flipping it.

[Simon-van-Diepen]

@FreekvanLeijen the descending tracks appear flipped because those plots are in radar coordinates, so that is expected behaviour as far as I know, please correct me if I'm wrong

@dcbarcham please move the parameter part of this ticket to https://github.com/TUDelftGeodesy/caroline-parameter-files/issues , that is where the parameter files currently reside (closed repo since this part is public)

As far as the LoS and PoV datasets go, I would advocate for that to be part of DePSI_group and to not tweak the Matlab code there any more, and for now manually convert between LoS and PoV (depending on which one you have)

[dcbarcham]

@Simon-van-Diepen I can't get to the page for the parameter files to move this, not sure if it doesn't exist or I just can't see it. But i'll check again later to see if it pops up and move it asap.

For the LoS and PoV datasets, I do plan to keep manually converting for know. Just wanted to mention it, in case it could help. Thanks for the letting me know all the above.

[FreekvanLeijen]

@Simon-van-Diepen thanks for your feedback.

On the flipped images: it is because of bad coding in Matlab. The images are intended to be flipped (for easier interpretation by the user), realized e.g. by this piece of code:

switch orbit
case 'desc'
mrm = flipud(fliplr(mrm));
end

Now the problem is that in our parameter file we have (probably for all descending stacks we are processing):

orbit = 'dsc'

So, because of the 'desc' vs 'dsc', it goes 'wrong'. I put it on my list to change the matlab code to case {'desc','dsc'}. Simon, if it does not break other things, you can also change your 'dsc' to 'desc'.

On the LoS to PoV issue, there is no Matlab coding issue here. It is a matter of changing in depsi_post.m

map_to_vert = 1;
to
map_to_vert = 0;

Simon, I propose to discuss in the huddle what the preferred option is.

@dcbarcham At least for now, you can indeed easily transform back by multiplying the velocities and time series with cos(incidence_angle).

[Simon-van-Diepen]

Hi @FreekvanLeijen , I can definitely change the orbit to be 'desc' instead of 'dsc', That just is a bug in Caroline, as it is indeed pasting asc / dsc in there instead of asc / desc. That'll be part of this ticket then.

@dcbarcham I'll check the permissions, and I can't fix those I'll do it for you, no worries.

As for the LoS / PoV, indeed both are possible, and controllable from Caroline directly, indeed through that parameter. The original question was if we could have both in the portal CSV output, which is what I am not in favour of since I believe that will break the portal.

Following the discussion in the huddle 29/9 with @FreekvanLeijen and @RamonHanssen , we will change the map_to_vert parameter to default to 0 (instead of 1) (so it is Line of Sight instead of Projected onto Vertical).

All AoIs that change together with these parameters will get the "_los" appended to their DePSI project names

[Simon-van-Diepen]

@dcbarcham I have invited you to the TUDelftGeodesy group, after accepting the invite you should be able to go to the parameter file repository.

[dcbarcham]

@Simon-van-Diepen Brilliant thank you, I'll move the parameter file changes over now.

[FreekvanLeijen]

Thanks both, good progress here!

[Simon-van-Diepen]

Just to summarize, what will happen here is:

• change the default for map-to-vert to 0
• make it so that orbit='desc' in DePSI