1. MOLA data processing with IDL programs

2. MOLA data was acquired by the lasing altitude onboard MGS, which transmitted the laser of 1.064 um to Mars surface. Its vertical resolution is 0.375 meter. • MOLA worked for 4.5 years altogether until June 31, 2007. An accident arouse its disability to work. • The original MOLA data is the AEDR (Aggregated Experiment Data Records ), which is off line currently. The usually used data is PEDR (Precision Experiment Data Records ), which is a profile data.

3. PEDR data is formatted according to its orbits and suffixed by “.B”. One PEDR file includes about 7 orbits data. • After you download the PEDR data, the first job is to decompose them to one orbit data. The job can be finished with the IDL program of “splitorb.pro”, which can be downloaded with the MOLA data together. Finally, you got about 7 “.b” files for one “.B” file.

4. The second thing for you is to get the profile from the single orbit, which is finished through the IDL program of “maprof.pro”. The program can give you a text file at the same time, which is the data that you want.

5. Because there are 9225 files altogether, it is impossible to extract the regional data manually from those files. • I have revised the above two files and got all the files in the text format. You can downloaded from the server. At the same time I have made a program to extract data according to coordinate system. • If you need a regional MOLA data, what you need to do is only running the extract.pro program.

6. Before running the program, you should do two jobs. The first is to adjust the data directory to the IDL working directory. The second is to change the latitude and longitude in the program to those that you need.

7. MOC-WA, E0101182.imq