Openworks and Elvis

July 20th, 2010

IRIS BLOG:

Having completed my preliminary look through the data, I proceeded to make navigation files for each line. I used a workflow in Promax that read in the SEGY data, output it in a Landmark Format, Selected every 50th Ping in each file from which to create a database, that we then converted to a spreadsheet. So our final result was a spreadsheet with the shot number, trace number, Easting, and Northing. When I finished creating the spreadsheet, Friday afternoon, I wanted to try and map the grid lines we had done with GIS so we could get a feel for where in the river this had taken place, etc. I didn't have any issues getting the data into GIS but everytime I projected it, GIS placed it very south of America let alone the Mississippi. I tried several projections but with the same result and figured there had to be something wrong with our coordinates. I compared my nav files with those of Guo Leis and found a huge difference. Beatrice and I talked about it Monday morning and discovered that what we thought were Easting and Northing were actually arcseconds of Latitude and Longitude.

Fortuitiously, she had a scrip on hand that would convert from Lat/Long to UTM coordinates and so with a few minor modifications that problem was fixed. I am now uploading these new navigation files and pairing them with their corresponding segy files in Openworks in order to get one step closer to interpretation. Every time I upload a line it plots it on a map that already has the lines from their voyage two years ago so you can get a feel for everywhere we've been. Additionally this allows you to compare CHIRP data for one area with the local MCS data or data from the previous trip.

In other news, my Mom's coming this weekend and we're headed to Graceland! Elvis' 75th birthday is this year so its a great time to be going. We're also headed to the Memphis Zoo! And of course a Riverboat Cruise! Then there's the hodgepodge of restaurants, stores, and exploring downtown to look forward to with her.