Hi everyone, I'm working on a sampling design using GRTS, but I'm running into a logistics problem. The field crew can set 5 nets per day, but only within a 5 km stretch, due to travel time constraints. With 10 sampling days, that's a total of 50 sites. The overall sampling area is huge, so running a regular GRTS design for 50 sites results, of course, in much larger distances between sampling points.
Is there a legitimate way to create a 2-level GRTS design, where in step 1 we choose 10 spatially-balanced sampling points (one "core" point per sampling day), and then for each of these "core points", we create a grid of 5 sampling points that are constrained to all be within 5 km from each other? I can make that happen code-wise, but am not sure what the implications on spatial balance are, or if there's a built-in way to do this. Would appreciate any thoughts... John [[alternative HTML version deleted]] _______________________________________________ R-sig-Geo mailing list R-sig-Geo@r-project.org https://stat.ethz.ch/mailman/listinfo/r-sig-geo