I want comparison two DEM generation with ALOS Word 3D and SRTM. I wonder that how can I use Alos DEM for DEM generation?
I input all stages that software want to DEM, I entered external Alos DEM. Is that ture?
My stages for processing TerraSAR X ;
interferogram formation (DEM necessary)-
topo phase remowal (DEM necessary)-
unwrap with snaphu-
phase to elevation or height(DEM necessary)
Please do not use Topo Phase Removal if you intend to create a DEM using SAR data, as you will remove the topographic information inside the data itself and you would create a DEM only with the topo phase residuals, atmospheric phase related and noise.
Hence, practically you do not need to use a DEM to create a DEM, just to compare or use it for bias removal or something post InSAR.
I hope this helps!
thanks for replay,
My second study about DEM generation. So I must create DEM’s for my study. so I will not use topo phase remowal for comparison and for other works I will use.