Holger Rose wrote: >I work on a small alternative weather station >diagram with rrd. In this time i can display >some values (temperature, rain ...), but with >others i have mental problems. > >When i will display Wind direction the graph >should be see like the Wind dir (deg) Graph in ><http://owfs.org/index.php?page=weather----owfsws>http://owfs.org/index.php?page=weather----owfsws > (only >a point for each value). Is that possible?
No, RRD tools does not do scatter plots, just line or area graphs. Have you considered an alternative tool such as GNUPlot to generate the graphs ? You can still use rrdtool to store the data, just extract it and use it as the input to another tool. As an aside, how are you storing your wind direction ? I ask just in case you've forgotten to take account of the fact that if you simply store the direction in degrees, then RRD will see a change from 359 to 0 as a large negative step - and if you average it, the average of 359 and 1 is not due north (0) but due south (180). I've even seen Military systems fail on that one - submarine autopilot that can't steer north ! One system I worked on 'fixed' that by using 0-720 so that 10 right from 355 is 365, not 005 - of course if you went full circle, at some point it had to apply a 360 adjustment to put itself back in that range. If you can arrange that any consolidations have a common point where all the period ends align, then I would suggest doing any such correction at that point so that you can change from (say) 540 to 180 (due south to due south) without it getting averaged to 360 (due north). >When i will draw Wind speed, the graph has a >dropout when Wind Gust is there. Is a mechanism >in rrd who will delete values which are a lot >greater or smaller then the last value (dequeues >spikes)? If so, (how) can i disable this setting? When you create an RRD you can specify limit for the values - did you do that ? We can't tell because we can't see what you did from here ! But what does your data show ? What did you put in, what do you get out if you dump the database ? _______________________________________________ rrd-users mailing list [email protected] https://lists.oetiker.ch/cgi-bin/listinfo/rrd-users
