Hi all,
Can someone tell me how to extract the cloud-masked OC4 chlorophyll with seadas?

thank

One method would be to use the load_graph command to create a graphic over the flags you want to exclude (e.g. clouds, land). You could then use mband_cmd to set the pixel values under the graphic to a missing value like "-999" and then output all the data using the out command. See this FAQ.

Or, after creating the graphic over flagged pixels with load_graph you could use the out_ascii command with the blotch_col option to output only the non-flagged chlorophyll pixels to a text file.