Hi, can a knowledgeable person please comment on whether I am using the "cell_methods" and "cell_bounds" attributes correctly in the example below? In particular, is my understanding correct that the cell_methods are attributed to the data variable, whereas the cell_bounds are attributed to the coordinate variable?
Also, is there a standard name suitable for expressing an acoustic travel time from an underwater echo sounder signal? The device literally reports a time (in seconds) of how long it took the echo to travel to its target and back. I am against reporting it as an average sound speed because the distance to the target might not be known with high accuracy, leaving me with two unknowns (sound speed and distance). The travel time itself is the quantity of interest. Thanks, Matt L. My first shot at cell methods: Dimensions: TIME=100 DEPTH=1 AUX=2 Data variable: VATT(TIME,DEPTH) VATT:long_name="vertical acoustic travel time" VATT:units="s" VATT:cell_methods="TIME: point DEPTH: sum" Coordinate variable: DEPTH(DEPTH) % here: one depth only, 3500m DEPTH:units="m" DEPTH:cell_bounds="AUX_DEPTH_BOUNDS" Auxiliary variable: AUX_DEPTH_BOUNDS(AUX)=0,3500; So... the cell_bounds are given as an attribute to DEPTH, and point to yet another variable (of length DEPTH+1) that actually contains the values. Or can I just write the values into the attribute to DEPTH: DEPTH:cell_bounds=0,3500; -- _______________________________________ Dr. Matthias Lankhorst Scripps Institution of Oceanography 9500 Gilman Drive, Mail Code 0230 La Jolla, CA 92093-0230 USA Phone: +1 858 822 5013 Fax: +1 858 534 9820 E-Mail: [email protected] http://www-pord.ucsd.edu/~mlankhorst/ _______________________________________________ CF-metadata mailing list [email protected] http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
