Hello Mahnaz, I have not used the cozigam package, but I would guess that if your longitude coordinates are for the western hemisphere you will want to have them negative. If they are for the eastern hemisphere then what you have is correct. You can check that they are displaying properly by examining the resulting plot. If the points are a mirror image of what you expect, then you need to change the sign of the longitude. Hope that helps. Jeff __________________ Jeffrey D. Holland Assoc. Prof. of Landscape Ecology & Biodiversity Dept. of Entomology, Purdue University
From: Mahnaz Rabbaniha [mailto:rab.mah...@gmail.com] Sent: Thursday, July 05, 2012 12:10 PM To: Holland, Jeffrey D Subject: Re: [R-sig-eco] plot data on base of lon&lat excuse me it is necessary revised the my data matrix: phyto Temperature Salinity lat lon 6279.283333 28.40206061 37.94621212 27. 2106 52.3402 25285.11667 28.70556522 37.55017391 27.1302 52.2808 34467.03333 30.0357 37.5787 27.0408 52.2208 thanks On Thu, Jul 5, 2012 at 8:35 PM, Mahnaz Rabbaniha <rab.mah...@gmail.com<mailto:rab.mah...@gmail.com>> wrote: thanks for answer but for question clearly i take a part of my data: phyto Temperature Salinity lat lon 6279.2833 28.40206 37.94621 27. 2106 52.3402 25285.117 28.70557 37.55017 27.1302 52.2808 34467.033 30.0357 37.5787 27.0408 52.2208 when i compare this with sample in cozigam pakage: i notice the lon in this matrix is different ( you can see in dawn) R> head(eggdata) bottom lon lat catch j.day year 1 170 -147.7500 59.33333 0 99 1987 2 620 -147.7500 59.01333 0 100 1987 3 160 -148.3000 59.03333 0 100 1987 4 135 -148.3167 59.35000 0 100 1987 5 175 -149.0000 59.00000 0 101 1987 6 115 -149.0333 58.33333 0 101 1987 the question is: i have to change the lon in my matrix as sample or no? thanks On Thu, Jul 5, 2012 at 8:21 PM, Holland, Jeffrey D <jdhol...@purdue.edu<mailto:jdhol...@purdue.edu>> wrote: Hello Mahnaz, Longitude is often expressed as distance or angle east of the prime meridian, so negative means it is west. If I am reading your question correctly, you are wondering how to change the longitude to make it negative? If so, you could create a new variable that is -1 times the original latitude for west coordinates, as in this example: newlongitude <- -1 * oldlongitude If the coordinates are for the eastern hemisphere you should leave them as positive values. Jeff __________________ Jeffrey D. Holland Assoc. Prof. of Landscape Ecology & Biodiversity Dept. of Entomology, Purdue University -----Original Message----- From: r-sig-ecology-boun...@r-project.org<mailto:r-sig-ecology-boun...@r-project.org> [mailto:r-sig-ecology-boun...@r-project.org<mailto:r-sig-ecology-boun...@r-project.org>] On Behalf Of Mahnaz Rabbaniha Sent: Thursday, July 05, 2012 11:38 AM To: r-sig-ecology Subject: [R-sig-eco] plot data on base of lon&lat Hi groups i want plot of phytoplankton density on base of Lon & lat, as same as the description on the cozigam package. but the main problem is the form of matrix Lon parameters in the example on eggdata that is negative ,how changed the longitude to this form ? thanks all Mahnaz [[alternative HTML version deleted]] _______________________________________________ R-sig-ecology mailing list R-sig-ecology@r-project.org<mailto:R-sig-ecology@r-project.org> https://stat.ethz.ch/mailman/listinfo/r-sig-ecology _______________________________________________ R-sig-ecology mailing list R-sig-ecology@r-project.org<mailto:R-sig-ecology@r-project.org> https://stat.ethz.ch/mailman/listinfo/r-sig-ecology [[alternative HTML version deleted]] _______________________________________________ R-sig-ecology mailing list R-sig-ecology@r-project.org https://stat.ethz.ch/mailman/listinfo/r-sig-ecology
