step 1: load shapefile line
step 2: add buffer (user defined distance)
step 3: make chain on line (user defined spacing)
step 4: cut xyz from bathy within buffer
step 5: drape xyz onto xy chain on line
step 6: interpolate out the nan's to obtain a 1D transect
step 1: load shapefile line step 2: add buffer (user defined distance) step 3: make chain on line (user defined spacing) step 4: cut xyz from bathy within buffer step 5: drape xyz onto xy chain on line step 6: interpolate out the nan's to obtain a 1D transect