Is your area in the middle of the Mediterranean Sea?
It is normal that there is no DEM over water… and looking at the coordinates that gives the warning… this seems to be the reason (from my understanding)
Without DEM they will not be any topographic phase removal.
Please check if your area contains also other piece of DEM and not only the one giving the error.
my area of interest include (IW3 and IW2) . my first work was the splitting of all my data with IW2, and i have done the process snap2stamps .
my question is how to combine the IW3 and IW2 to have my area of interest ???
Well…Using my scripts you may run the steps 2 and 3 for each of the IWs and then you may need to include also the merging in a latter step. This is not in the current snap2stamps version but it is quite easy to implement it and include it in a second release
I just tried to use snap2stamps code to process images with SNAP v7.0.2.
My study is area just in one burst, so I have already deleted the ESD operator in coreg_ifg_computation.xml and coreg_ifg_computation_subset.xml.
But there still have the same error message as followed:
Error: [NodeId: Enhanced-Spectral-Diversity] Operator ‘SpestralDiversityOp’: Unknown element ‘useSuppliedShifts’
Which file had you modified? It seems that SNAP is still getting the one containing the ESD operator.
Secondly, SNAP 7 modified the ESD operator changing the parameters contained in the xml, but if you do not need it, you should not care about updating them.
You remove the dependency of the ESD operator as I can see, but had you removed it from the xml? I can see some of the ESD tags on top of the interferogram block.
Please remove it totally from the xml graph with the subsetting, as it is the one used by default in snap2stamps and try again.
Sorry to disturb you again.
I tried another study area, more than one burst. So, I keep ESD operator as default.
But I received the same error message as before I only processed one burst with ESD:
Error: [NodeId: Enhanced-Spectral-Diversity] Operator ‘SpestralDiversityOp’: Unknown element ‘useSuppliedShifts’
As said already, SNAP 7 changed the xml tags, so you should get them and update the graph provided within snap2stamps, as they were ready and aligned with SNAP 6.0
running the command gpt -h SpectralDiversiyOp should give you the current tags that SNAP 7 expects to get. Use that to update the graph provided by snap2stamps and it should be ok.
Thank you! Now I understand what you mean before.
But I have tried running the command, and got an error message as below:
Unknown operator ‘SpectralDiversityOp’
then run gpt -h so you can see all the operator list and then running the command I said to you last time with he correct operator name (Enhanced-Spectral-Diversity) you should get something like:
You should get these parameter list (remove any whitespace character from here) and substitute them in the graph, using some default parameters similar to the ones are now in the snap2stamps graph.
Let me know
1,500 km² is roughly 40x40 km - this should be manageable somehow. The AOI defined in the config file determines the required bursts. Sometimes, a slightly smaller AOI results in one or even two bursts less, depending how much is covered.
In my example, the red AOI requires the processing of 5 bursts, while the green AOI only covers 3 bursts. It is worth comparing if you can slightly reduce the AOI size to reduce the amount of data to be processed by 40%,
Besides that, 16 GB is not very much, especially the coregistration takes lots of memory. The second limitation is the reading/writing speed. If you have a computer with an SSD, you can move your data and process the data there. To my experience, this speeds up the processing. I am not sure if this solves the data buffer error however.
Thank you!
I will check my AOI and try to reduce the size for less bursts.
I don’t have SSD, but I could increase the CACHE to 19G or 20G which may solve these problems?
Or I need not only increase the CACHE but also the RAM in my computer first?
I check my ifg results and found that the area is much bigger than the AOI area I have set in project.conf.
(It is strange, because the result area was agreed with the AOI set in project.conf when I processed only one burst before.)
So, I back to check the coreg_ifg_computation_subset.xml, and opened by graph builder. Got an error message as follow:
In addition, I need to change the path of graphxml parameter from GRAPH+’/coreg_ifg_computation.xml’ to GRAPH+’/coreg_ifg_computation_subset.xml’in coreg_ifg_topsar.py?
No, I didn’t prepared master with the same number of burst s as expected by the AOI. I will modify it and try again.
I think I use the latest version of snap2stamps the version is v1.0.1. And I download again from GitHub. The subset operator still not exist in coreg_ifg_computation_subset.xml.
