Linear to DB conversion and Graph Builder +possible error

Microwave Toolbox
1

Dear Step User Hi!,
I have met a problem on applying linear to db conversion to layer stack on graph builder of Sentinel 1A in which it produces irregular shape.
I would like to inform you that prior to applying linear to db I have done following steps:
Apply precise orbit file->Thermal Noise–>Calibration to B nugth–>Terrain Flattering—>only coregisteration->Temporal Speckle Filter( Gamma Map3*3- estimated equivalent Number of Look)-Range Doppler Corretion

Then
I have applied linear to db conversion in graph builder to the corrected layers(12 layers). I have got 12 db coverveted image like this:

image.jpg1287×805 560 KB

I appreciate your valuable suggestions.
Many thanks
Simon

2

could it be that it was just a reason of memory capacity? I had a similar graph with linear to db conversion at the end and it was just fine.
Can you identify at which step the patterns occur?

3

Hi,
Please accept my apology for late reply as I was out.
Regarding your question, the patterns occurred after db conversion in graph builder.
With respect to your suggestion about memory capacity, I do not think it could be result of memory capacity. This is because if I apply db conversion without graph builder(just click right on the band), I get fine result.
However, I have 12 images, thus I want to do it automatically.
Please let me know your suggestion.
Regards,
Simon

4

that’s strange. Did you run it again to see if the same happens? Cannot reproduce this at my side.

5

Hi,
Thanks for your message.Yes, I did and the results were same as previous. I do know what I should to do.

6

Hi,Sorry what I meant that I do not know what I should do.
I would like to inform you that this is the result of single band using linear to db conversion(right click on the band)

image.jpg1302×829 547 KB

However, when I use this function in graph builder , the image would be distorted.
I appreciate your suggestions.
Thanks
Simon