After two days working, I am near to finish  all of the work. Acturally, it's boring and harmful to eyes, since you have to stare at the screen all the time depicting the shape of the terrain.This is not the most complex.  Adjustment of pictures are much more time-consuming and complex, you have to choose same points in two maps which might be not totally same. So some times it is just impossible to get a totally adjusted  picucture. I spent one day and a half to do that. Lucky one of my collegues aggreed to help me do my work and the pay is that I had to translate her dissertation into English. Actually, it is a good opportunity to practice writing, and I was happy to reach the deal.  It first turned out to be even complex again, since there are many professional word to be translated, which really bothered me. But forturnately, when it went to the analysis and discussion part, many of the sentences became easy to be translated. I spent one day and a night on doing it, now it is done. But I am totally beat-up as a result. Have a good sleep!