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#1
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Software to graph NMEA Windspeed
This is for a base station wind instrument which I'm putting together for a sailing club.
They have the NMEA instrument and have asked that I can put nice pretty graphs of wind speed and direction up on their website. I'm thinking of just writing some code myself to take the input and create a text file with it and have that FTP'd to their webspace and run CGI scripts to graph it. This might make it a bit clearer! I hope On Sat, 04 Oct 2003 16:59:10 GMT, "Glen Wiley Wilson" wrote: I could add a graph of that type to my cpRepeater program in about 20 minutes, since I already have graphs like course, speed, and depth. But cpRepeater would probably be overkill for your needs and isn't primarily a graphing tool; the graphs aren't what I'd call presentation quality. I'll likely add everything you asked for except jpg save to the next free maintenance release, though. It seems like an attractive feature. I'll have to think about the save feature... Do you want to do this occasionally, or all the time? It makes a difference. If you just want to do it occasionally, you could live with a more manual procedure. I'm pretty sure I've seen at least one freeware NMEA to disk logger. Given the data, you could graph it with a spreadsheet package, which would also have the avility to save the graph. For instance, cpRepeater does log the data you want to disk (at intervals you set) as a file you could easily import into a spreadsheet and graph to your heart's content. Then, you could save the graph or even capture it with a freeware screen capture utility like AnalogX Capture. That said, what you're looking for should be pretty simple to build; I'll be surprised if you don't get a pointer to something that will work. If not, I might knock something out when I have time. Is this a home use thing or is it for the boat? Glen "Wiley" Wilson usenet1 SPAMNIX at worldwidewiley dot com To reply, lose the capitals and do the obvious. Take a look at cpRepeater, an NMEA data integrator, repeater, and logger at http://www.worldwidewiley.com/ |
#2
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Software to graph NMEA Windspeed
On Sun, 05 Oct 2003 05:43:22 GMT, J tempted
fate with: This is for a base station wind instrument which I'm putting together for a sailing club. They have the NMEA instrument and have asked that I can put nice pretty graphs of wind speed and direction up on their website. I'm thinking of just writing some code myself to take the input and create a text file with it and have that FTP'd to their webspace and run CGI scripts to graph it. This might make it a bit clearer! I hope Interesting. While we mull that over, you might be interested in: http://ompl.marine.usf.edu/PORTS/g8726520.html It might give you some ideas. This is data from sensors a couple of hundred yards from my marina. They have data from other sensors spread around the bay. I don't know how they are doing it, though. Glen "Wiley" Wilson usenet1 SPAMNIX at worldwidewiley dot com To reply, lose the capitals and do the obvious. Take a look at cpRepeater, an NMEA data integrator, repeater, and logger at http://www.worldwidewiley.com/ |
#3
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Software to graph NMEA Windspeed
I have Visual Basic subroutines for sorting out NEMA messages into the
relevant data (wind, position, depth, etc.) and logging it which I'd be happy to send, no charge, no guarantees. (code, not executables -- you'd need VB to compile and run it. As for graphs, I'd suggest pulling the log up into Excel -- you can then easily produce any graph you want. Jim Woodward www.mvFintry.com J wrote in message . .. This is for a base station wind instrument which I'm putting together for a sailing club. They have the NMEA instrument and have asked that I can put nice pretty graphs of wind speed and direction up on their website. I'm thinking of just writing some code myself to take the input and create a text file with it and have that FTP'd to their webspace and run CGI scripts to graph it. This might make it a bit clearer! I hope On Sat, 04 Oct 2003 16:59:10 GMT, "Glen Wiley Wilson" wrote: I could add a graph of that type to my cpRepeater program in about 20 minutes, since I already have graphs like course, speed, and depth. But cpRepeater would probably be overkill for your needs and isn't primarily a graphing tool; the graphs aren't what I'd call presentation quality. I'll likely add everything you asked for except jpg save to the next free maintenance release, though. It seems like an attractive feature. I'll have to think about the save feature... Do you want to do this occasionally, or all the time? It makes a difference. If you just want to do it occasionally, you could live with a more manual procedure. I'm pretty sure I've seen at least one freeware NMEA to disk logger. Given the data, you could graph it with a spreadsheet package, which would also have the avility to save the graph. For instance, cpRepeater does log the data you want to disk (at intervals you set) as a file you could easily import into a spreadsheet and graph to your heart's content. Then, you could save the graph or even capture it with a freeware screen capture utility like AnalogX Capture. That said, what you're looking for should be pretty simple to build; I'll be surprised if you don't get a pointer to something that will work. If not, I might knock something out when I have time. Is this a home use thing or is it for the boat? Glen "Wiley" Wilson usenet1 SPAMNIX at worldwidewiley dot com To reply, lose the capitals and do the obvious. Take a look at cpRepeater, an NMEA data integrator, repeater, and logger at http://www.worldwidewiley.com/ |
#4
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Software to graph NMEA Windspeed
Capture the data with Hyperterminal into a file. Import it into Excel
as a comma-delimited text file and graph it there. Joe Wood J wrote: This is for a base station wind instrument which I'm putting together for a sailing club. They have the NMEA instrument and have asked that I can put nice pretty graphs of wind speed and direction up on their website. I'm thinking of just writing some code myself to take the input and create a text file with it and have that FTP'd to their webspace and run CGI scripts to graph it. This might make it a bit clearer! I hope On Sat, 04 Oct 2003 16:59:10 GMT, "Glen Wiley Wilson" wrote: I could add a graph of that type to my cpRepeater program in about 20 minutes, since I already have graphs like course, speed, and depth. But cpRepeater would probably be overkill for your needs and isn't primarily a graphing tool; the graphs aren't what I'd call presentation quality. I'll likely add everything you asked for except jpg save to the next free maintenance release, though. It seems like an attractive feature. I'll have to think about the save feature... Do you want to do this occasionally, or all the time? It makes a difference. If you just want to do it occasionally, you could live with a more manual procedure. I'm pretty sure I've seen at least one freeware NMEA to disk logger. Given the data, you could graph it with a spreadsheet package, which would also have the avility to save the graph. For instance, cpRepeater does log the data you want to disk (at intervals you set) as a file you could easily import into a spreadsheet and graph to your heart's content. Then, you could save the graph or even capture it with a freeware screen capture utility like AnalogX Capture. That said, what you're looking for should be pretty simple to build; I'll be surprised if you don't get a pointer to something that will work. If not, I might knock something out when I have time. Is this a home use thing or is it for the boat? Glen "Wiley" Wilson usenet1 SPAMNIX at worldwidewiley dot com To reply, lose the capitals and do the obvious. Take a look at cpRepeater, an NMEA data integrator, repeater, and logger at http://www.worldwidewiley.com/ |
#5
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Software to graph NMEA Windspeed
Hello,
We have a tool under development which graphs wind speed and direction and much more. You can set the time span from 1 minute until 16 hours and the program offers many options for filtering and averaging the data. If you combine it with a screen capture facility and automatic FTP it may do the job for you. You can download a 30 day trial version at: http://www.nauticis.com/download/supernova.rar Willem Amels |
#6
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Software to graph NMEA Windspeed
While you guys are working on programs, I want to see one that produces
polars from actual data. Say you would set the sea state and then when you get the boat really cooking you hit a button and it records the wind data and boat speed. Then it would sort it all out and plot polars for each sea state. Another option would be to just constantly record the data and then use peak boat speeds maintained for more than say 30 seconds to select the points to plot. It would be really interesting to invite a hotshot crew of racing sailors to sail a boat and produce a set of polars then do the same with your regular crew and try to match the results. It would be a great way to refine sail trim and helm techniques. Willem Amels wrote: Hello, We have a tool under development which graphs wind speed and direction and much more. You can set the time span from 1 minute until 16 hours and the program offers many options for filtering and averaging the data. If you combine it with a screen capture facility and automatic FTP it may do the job for you. You can download a 30 day trial version at: http://www.nauticis.com/download/supernova.rar Willem Amels -- Glenn Ashmore I'm building a 45' cutter in strip/composite. Watch my progress (or lack there of) at: http://www.rutuonline.com Shameless Commercial Division: http://www.spade-anchor-us.com |
#7
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Software to graph NMEA Windspeed
Hello Glen,
The tool we are developing does not yet produce polars from actual data. However it does compare the actual data to a theoretical polar coming from e.g. a IMS certificate. I have been collecting data for half a year now, and found that the fluctuations to the incoming data ("noise") affect the calculations very much. We have therefore included extensive filtering capablities to get reliable data to input into the polars. The next step in the development is an analysing tool to go through the collected data and establish a polar based on actual data. Willem Amels Glenn Ashmore wrote in news:YSdgb.46915$sp2.44462@lakeread04: While you guys are working on programs, I want to see one that produces polars from actual data. Say you would set the sea state and then when you get the boat really cooking you hit a button and it records the wind data and boat speed. Then it would sort it all out and plot polars for each sea state. Another option would be to just constantly record the data and then use peak boat speeds maintained for more than say 30 seconds to select the points to plot. It would be really interesting to invite a hotshot crew of racing sailors to sail a boat and produce a set of polars then do the same with your regular crew and try to match the results. It would be a great way to refine sail trim and helm techniques. Willem Amels wrote: Hello Glen, Hello, We have a tool under development which graphs wind speed and direction and much more. You can set the time span from 1 minute until 16 hours and the program offers many options for filtering and averaging the data. If you combine it with a screen capture facility and automatic FTP it may do the job for you. You can download a 30 day trial version at: http://www.nauticis.com/download/supernova.rar Willem Amels |
#8
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Software to graph NMEA Windspeed
On Mon, 06 Oct 2003 09:06:44 -0400, Glenn Ashmore
tempted fate with: While you guys are working on programs, I want to see one that produces polars from actual data. Say you would set the sea state and then when you get the boat really cooking you hit a button and it records the wind data and boat speed. Then it would sort it all out and plot polars for each sea state. Another option would be to just constantly record the data and then use peak boat speeds maintained for more than say 30 seconds to select the points to plot. It would be really interesting to invite a hotshot crew of racing sailors to sail a boat and produce a set of polars then do the same with your regular crew and try to match the results. It would be a great way to refine sail trim and helm techniques. Glenn Oddly enough, my cpRepeater program might be good start on this. The current version captures all the data you want, including sea state. It can export it as a CSV file easily imported into just about anything. Based on your specs, I'd probably need to up the sample frequency or else add the manual feature you mentioned. Unless you can live with a 1 minute sample rate. The part I don't have is the actual generation of polars. That's on the list to research as an add-on someday. My gut feel is that filtering the data is tougher than generating the polars. The manual approach you mention would take that burden off me and put it on you, where it belongs. :-) Adding the manual sample bit would be easy enough. Hmmm.. Glen "Wiley" Wilson usenet1 SPAMNIX at worldwidewiley dot com To reply, lose the capitals and do the obvious. Take a look at cpRepeater, an NMEA data integrator, repeater, and logger at http://www.worldwidewiley.com/ |
#9
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Software to graph NMEA Windspeed
Glen Wilson wrote: Oddly enough, my cpRepeater program might be good start on this. The current version captures all the data you want, including sea state. It can export it as a CSV file easily imported into just about anything. Based on your specs, I'd probably need to up the sample frequency or else add the manual feature you mentioned. Unless you can live with a 1 minute sample rate. The part I don't have is the actual generation of polars. That's on the list to research as an add-on someday. My gut feel is that filtering the data is tougher than generating the polars. The manual approach you mention would take that burden off me and put it on you, where it belongs. :-) Adding the manual sample bit would be easy enough. Hmmm.. The 30 seconds was just an arbitrary period to filter out surges due to surfing etc. Manually picking the record point would be a problem because if you are like me, when you really get the boat in the sweet spot the last thing you think about is pushing a button! :-) Analysis would be the real problem. First you would have to group by sea state and wind speed to get a data set and sort by true wind angle to get the polar coordinate then pick the highest normal boat speed to get the vector length. That last step would be the most complicated. Maybe look at everything within 2.5º+ - of the true wind angle in 5º increments, throw out everything below the median to eliminate acceleration and use the mode or the upper standard deviation of the remaining values. What I am after is not a theoretical value for boat performance from a VPP but more the relative performance of the boat and crew together. I would like to be able to gather data for several weeks and plot it out. That could be used as a base line for tuning the boat and crew. Then after a few months of working with the boat repeat the process and see how much we have improved. -- Glenn Ashmore I'm building a 45' cutter in strip/composite. Watch my progress (or lack there of) at: http://www.rutuonline.com Shameless Commercial Division: http://www.spade-anchor-us.com |
#10
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Software to graph NMEA Windspeed
Not quite so easy, Glenn. I race as navigator and pit on a Jenneau
Selection 37 that is now one of the top boats in Massachusetts. It took us five years racing three or four days a week to get the boat dialed in -- maybe we're just dumb, but our present record suggests otherwise. So if you want to invite us down for a year or two -- your expense, of course ;-) As far as recording polars goes, the package I've sent to two of the posters here, following up on my earlier offer in this thread, will automatically log all you need for polars with very little modification. You would need to be comfortable with Visual Basic. You don't really need polars, however, as all you have to do is sail for the best VMG on your GPS. This suggests that you have someone aboard who knows how to pull the strings just right. Many cruisers could benefit from a season or two of racing on a serious boat -- I certainly did. Since boats in the 30-40' range carry crews of 8-10 people, there is often an opening for one or two novices who may be nothing but movable ballst for almost the whole race. Try your local yacht club. Jim Woodward www.mvFintry.com Glenn Ashmore wrote in message news:YSdgb.46915$sp2.44462@lakeread04... While you guys are working on programs, I want to see one that produces polars from actual data. Say you would set the sea state and then when you get the boat really cooking you hit a button and it records the wind data and boat speed. Then it would sort it all out and plot polars for each sea state. Another option would be to just constantly record the data and then use peak boat speeds maintained for more than say 30 seconds to select the points to plot. It would be really interesting to invite a hotshot crew of racing sailors to sail a boat and produce a set of polars then do the same with your regular crew and try to match the results. It would be a great way to refine sail trim and helm techniques. Willem Amels wrote: Hello, We have a tool under development which graphs wind speed and direction and much more. You can set the time span from 1 minute until 16 hours and the program offers many options for filtering and averaging the data. If you combine it with a screen capture facility and automatic FTP it may do the job for you. You can download a 30 day trial version at: http://www.nauticis.com/download/supernova.rar Willem Amels |
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