Topic: COSI-Corr for sand dune movement in Qatar
Dear Sebastien, Dear Colleagues,
I was registered here two years ago and even posted once, while I was working on my Bachelor thesis. As I had time pressure I couldn't use COSI-Corr in my thesis. Now I am involved in a project, where we want to measure the sand dune movement in South-East-Qatar over different time lines, using COSI-Corr. My assignment is to get familiar with COSI-Corr and ENVI, but I don't have much experience with both programs.
I have satellite data from 1995 and 2004 (IKONOS) with a resolution of 1 m, so I cut out two images of the same area with a resolution of 800 x 800. They are georeferenced in ArcGIS (same coordinate system), but COSI-Corr tells me they are not georeferenced. I think this shouldn't be a problem because a pixel per pixel comparison should work here as well. While one of the satelite images is just black and white, the newer one has 3 bands. I also don't think this should be a problem. (In my next step I anyway want to compare the IKONOS data of 2004 with around 50 years old CORONA images.)
I tried to run the images through COSI-Corr with a lot of different options to compute the correlation, but I always just got images with a lot of noise as a result. I tried the Frequency Correlator with a lot of different settings as the Statistical Correlator, but I didn't get any results and I couldn't find the mistake I am doing. Maybe somebody has an idea what I could try to get some results. For example using the Freq correlator... what for a setting would you suggest for the data? (The dune displacement is around 100 pixel and the expansion of the dune is a little bit below 150 x 150 pixel.) I tried many different window and step sizes for example. Please help me, as I belive I am just missing out something.
Best regards, Fabian