Question about interpreting SNAP colour legend for a wrapped interferogram

Microwave Toolbox
#1

Hi all. This is probably a really obvious question, but I am having trouble interpreting SNAP’s colour legend for my wrapped interferogram. Here’s an example below:

14Mar_26Mar.PNG608×539 561 KB

The image shows a wrapped interferogram for a landslide I am looking at (contained within red line) exported into .kmz format and viewed from ground level in Google Earth. My question is: what units is the colour legend in? I am assuming it is pi radians, but if that is the case why do the phase values extend to +/- 2.83 rather than +/- 2.0 as I would expected to see for a wrapped interferogram? How should I interpret this?

Cheers :slight_smile:

#2

The range is -pi to +pi.

#3

Thanks lveci for your response. Why is that the phase values in the colour legend extend to +/- 2.83 pi then?

#4

no it goes from -3.14 to 3.14. The markers shown in the colour bar are just to display it.

#5

Oh right I see now thank you, that makes sense. So do these colour cycles represent fringes then?

#6

The fringe is one colour cycle.

#7

Thank you!

#8

So in the above image, how many fringes would you say estimate there are?

#9

Screenshot (80).png1365×723 1.72 MB
Screenshot (78).png1366×768 2 MB

Hello everyone
Can anybody suggest me what information can be derived from this interferogram, as i am unable to get some sort of fringes. What do these color gradients on mountain slopes indicate.

Please help

#10

Is there a way to display that color legend on the side on SNAP instead of exporting the interferogram image into google earth ?

#11

This is not easily possible.
You can export the legend as image (right-click on scene and select export color legend as image) and then import it as a layer.

image
image2055×1175 165 KB

Usually it is not necessary to overlay it in the scene image because you have the colour manipulation tool window.