How to import tiff to grasshopper with bison

Hi,
I want to know is that available to import tif. or srtm. file to grasshopper to analyze flow, watershed with bison. I have looked through some topics about it but I failed at the first step when importing the file into it.
Can somebody help to provide a clearer and more specific tutorior for it?
Thanks

Hi - please don’t ask the same question in multiple threads.
Did you read the manual that comes with Bison?
To get help, please always post relevant files.
Also, there is contact information for @bison on the Food4Rhino page.
-wim

OK, I am sorry about that and I will not do that again.
Yes, I have read it before but just cannot solve it.

And I will try it again and post the file after some time if it still doesn’t work.

Thank you so much.