Maybe I answered my own pallet-match question? When working with multiple displacement images, from different swaths or different image products or time series, find the minimum and maximum data values from all of the images. Then create a pallet using the minimum minimum and maximum maximum values for the pallet range. My pallet goes red (uplifted) to white (no displacement) to blue (subsidence). Place the file in the .snap>auxdata>color_pallets sub directory. The file (attached) reads:
#BEAM Color Palette Definition File
#February 23, 2019 pallet for InSAR displacement
color0=0,0,255
color1=255,255,255
color2=255,0,0
numPoints=3
#edit the next line to the minimum value of the set
sample0=-0.66
sample1=0.0
#edit the next line to the maximum value of the set
sample2=0.66
autoDistribute=true
0_displacement.cpd (310 Bytes)
I used a text editor to create the pallet, using an included pallet as a template. I think it can also be done in the SNAP GUI, color manipulation tool window. In the color manipulation tool window, with the pallet selected, select the basic pane, then Get Data from (pallet) File button (as opposed to the image data range).
In the upper right of this pane, there is also a button to apply the pallet to other image files, a check list is presented.
I still don’t get perfect match in Radar>Geometric>SAR Mosaics, but much better than the above image. Is there a better way to match images? Are there processing parameters that can be set to maintain the scale of displacement between images?