How do you manage the data on this cruise?
One of the capabilities of GIS (Geographic Information Systems) is to manage data from different sources. With this type of software we can combine geographical data (in this case multibeam and backscatter maps) and biological data (fish counts, abundances, habitat observations, etc).
Once we have the data from the AUV processed, we can add it into the GIS as images (GeoTIFF files) or as XYZ files (easting, northing, depth) which we can convert to a grid. With the former one, we have just a visual representation of the area but it doesn’t give us any other information. However, with a Grid, each cell (with a resolution that depends on the multibeam sonar of the AUV) has a depth value attached to it. That way, we can know the exact depth for each point of the map. These multibeam maps allow us, for example, to find rocky habitats, perfect places for spawning aggregations, or to find possible places for Oculina. Moreover, if we have multibeam maps from different years we can also calculate change in abundance of Oculina throughout a period of time.
With the tapes from the ROV dives we can calculate fish abundance estimates or determine the habitat type for each point along the dive. With the still pictures taken throughout each dive, we can calculate the percent of habitat cover. All this biological data can be combined and spatially analyzed using GIS, for the purpose of monitoring fish populations and describing how they interact with various habitat types.
It is the combination of multibeam maps and fisheries data that will provide a better understanding of the area. It will also allow us to see trends through a period of time. In the end, all this information will help protect closed areas in a better way.
October 16th, 2006 at 6:10 pm
Dear Andrew, I just wondered what was your favorite discovery that you ever discovered? Because one day I would like to explore the sea and land. You are my role model in life and science. I want to grow up just like you because to me you are one of the awsomest people I ever heard of. From one of your biggest fans, Rolando B.
November 6th, 2006 at 4:29 pm
Rolando, My favorite discovery was the cold seep communities living in the deep sea. I was not the first explorer to these sites, but had the opportunity to dive on them in the first years they were explored with submersibles. Many people still describe the deep sea as a desert. This comparison is not far off in that deserts have oases where water breeds life. Cold seep communities grow in areas of the seafloor where gas and oil are seeping out into the water column. I was amazed by the abundance and variety of life in the deep dark ocean.
If I am a role model, I hope it is to encourage you to work hard to chase your dream — it is worth the ride.