"Creating image" goes to endless

Microwave Toolbox
1

Dear all,
I’m trying to visualize an output but unfortunately SNAP seems to be unable to upload it (in QGIS it works). The output is around 5GB in terms of weight and it is the result of a mosaic + subset of S1 GRD IW granules.

image
image1215×848 20.3 KB

Reading on the forum, taking into account my RAM (16GB), I’ve edited the following files (form the folder…/snap/etc):

  • snap.conf --> I have changed this:
    J-Xmx5G
    to
    J-Xmx12G

  • snap.properties --> I have changed this:
    snap.jai.tileCacheSize = 1024
    to
    snap.jai.tileCacheSize = 8192

SNAP is much more reactive in terms of processing but it is still unable to upload my output just for visualization. Do you have any suggestion please?

1 Like
2

I have personally seen this (rare) issue but SNAP developers were unable to replicate it so it could not be fixed. I suspect it’s somehow related to your system setup. Have you tried uninstalling SNAP and making a clean re-install?

Could you share the details of your operating system & list all actions required to replicate the bug?

1 Like
3

Dear Mr. @mengdahl,

I performed a simple re-install several times. With the expression “clean re-install” , do you mean to check the box “Yes, try deleting all SNAP user data”?
image
I didn’t do that, because I need my data.

  • My operating system is Windows 10

  • processor: Intel® Core™ i7-4770 CPU @ 3.40GHz

  • RAM = 16GB

My action was just to run a graph on SNAP (Slice Assemby of 3 S1GRD granules + Subset + radiometric and geometric corrections).
I’m working remotely, however I’ve already faced a similar problem also working not remotely. In my experience this issue is just correlated with the data dimension; every time I have an output bigger than 3 GB (in this case 5GB), the uploading on SNAP, just for visualization purpose, is very hard and I’m forced to use another software (e.g. QGIS) to analyze my output. I tried also with different computers.

BR

4

Hi! I tried to edit that files (from folder…/snap/etc), but i got this error message:

“C:/Program Files…/snap/etc/snap.config
You do not have permission to open this file. Check with the file owner or administrator for permission”

How can i solve it???
Thanks

5

This is not SNAP related, you have to assign permissions to modify the file as described here: You Don’t Have Permission to Open This File in Windows 10

1 Like
6

Thanks! I solved it. But now i have another issue…
I’ve started an Insar analysis for Sentinel-1 images following this steps:

  1. S1 TOPS Corregistration
  2. Interferogram Formation
  3. Subset

When i want to display the image from subset virtual band Phase_ifg y get this (screenshot). What im doing wrong??

Sin título
Sin título1360×768 354 KB

7

that means the coregistration was not successful.
Before you create the interferogram, please check with an RGB if the images are correctly aligned. It is described in this tutorial (page 9).
Sentinel-1 TOPS interferometry