[R-sig-Geo] UTM problem

[Werner W.]

Hi Sarah,

many thanks for checking this. I looked at the documentation again and this is 
the info about the GPS receiver setting they used:
POSITION FRMT: hddd.ddddd
MAP DATUM: WGS 84
CDI: +-0.25
UNITS: METRIC
HEADINGS: GRID E000
DEGEES


I'm not sure if this is any useful.
Any idea what I should be looking for?

The survey actually covers the whole of Uganda. Can it actually be that the 
entire country is UTM zone 36N or does the zone have to change? The docu 
suggests it is all 36N.

Thanks again,
  Werner




----- Ursprüngliche Mail ----
> Von: Sarah Goslee <sarah.goslee at gmail.com>
> An: Werner W. <pensterfuzzer at yahoo.de>
> CC: r-sig-geo at stat.math.ethz.ch
> Gesendet: Mittwoch, den 13. Oktober 2010, 14:48:50 Uhr
> Betreff: Re: [R-sig-Geo] UTM problem
> 
> Hi,
> 
> I double-checked your results with an online conversion tool
> (http://www.rcn.montana.edu/resources/tools/coordinates.aspx)
> and got the  same answer.
> 
> That means that your R code is fine, and there's  something
> wrong with the original data. If possible, you should check  with
> the source. There could be a problem with the metadata, or
> with the  data themselves.
> 
> Sarah
> 
> On Wed, Oct 13, 2010 at 9:37 AM, Werner W.  <pensterfuzzer at yahoo.de>  wrote:
> > Hi,
> >
> > this questions is not really about R but it  would be great if somebody 
could
> > point me to a forum or so where I can  get help with this.
> >
> > I only know a few basics about GIS and have  a problem with some UTM 
>coordinates
> > from a survey.
> > Coordinates  are given as, e.g.
> > 3258843     32780
> > which are supposedly zone  36N on system WGS84 (according to the 
>documentation).
> > If I convert it to  long/lat using gdal:
> >> require(rgdal)
> >> SP <-  SpatialPoints(cbind(X=3258843,  Y=32780),proj4string=CRS("+proj=utm
> >>+zone=36  +ellps=WGS84"))
> >> spTransform(SP, CRS("+proj=longlat +ellps=WGS84")) #  x1=longitude x2=lat
> > SpatialPoints:
> >           X         Y
> >  [1,] 57.0489 0.2706471
> > Coordinate Reference System (CRS) arguments:  +proj=longlat +ellps=WGS84
> >
> > The point should be close to Kampala  which has the coordinates 0.3°, 
>32.633333°
> > and UTM 36N 459199 33160 on  WGS84. My data's easting seems quite off.
> >
> > Has anybody an idea  what I am doing wrongly?
> >
> > Thanks so much,
> >   Werner
> >
> >
> >
> 
> 
> -- 
> Sarah Goslee
> http://www.functionaldiversity.org
>