We have adopted and adapted their approach, and in short use the following when mapping:
Water must not be too rough and no large waves (white caps) in area of interest; daylight hours; plus and minus one hour of low tide; ideally tidal height should be less than 1.2 metres (or 3.94’).
We also use the following approach for categorization.
And, use this approach adapted from work on tree canopies for assessing density. A consensus rating across all kelpers in the boat that day is used to avoid issues around inter-coder reliability.
As of July 25 2013 approximately 75% of Gabriola Island has been mapped. We are noticing unusually warm surface temperatures with a range of 18-22 C. This has prompted us to map earlier in the summer than what Mayne Island did due to concerns that bleaching and bull kelp decline is happening early this growing season. Here's a snapshot of our mapping progress. We have much more detailed maps, and this is just an overview.