Re: Map scatter plot

Hi,

Without specifics, it sounds like you might want to put your data into
an ascii file and read it into lon/lat arrays. There are a number of
examples at:

http://www.ncl.ucar.edu/Applications/read_ascii.shtml

Hope that helps.
Rick

On Jul 28, 2010, at 7:48 AM, Cecille M. Villanueva Birriel wrote:

> Hello,
>
> I am trying to do a US map scatter plot putting my own locations.
> In the ncl website they have an example which I have copied below.
> It is using a cdf file for the data entry but I want to put my own
> locations manually, how can i do that?
>
> ; ***********************************************
> ; scatter_3.ncl
> ;
> ; Concepts illustrated:
> ; - Drawing a scatter plot over a map
> ; - Drawing markers on a map
> ; - Attaching markers to a map
> ; - Changing the marker color and size in a map plot
> ; - Drawing markers on a map indicating the locations of station
> data
> ;
> ; ***********************************************
> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"
> ;************************************************
> begin
> ;************************************************
> ; Generate some random data
> ;************************************************
> filename = "95031800_sao.cdf"
> filedir = ncargpath("data") + "/cdf/"
> f = addfile(filedir + filename,"r")
>
> lat = f->lat
> lon = f->lon
> ;
> ; There are some stations with lat/lon values outside range, so
> ; set these to missing.
> ;
> lat = where(lat.lt. -90.or.lat.gt. 90,lat@_FillValue,lat)
> lon = where(lon.lt.-180.or.lon.gt.180,lon@_FillValue,lon)
>
> wks = gsn_open_wks ("ps","scatter") ; open
> workstation
>
> res = True ; plot mods
> desired
> res@gsnFrame = False ; don't
> advance yet
> res@gsnMaximize = True
>
> res@mpMinLatF = min(lat) - 5
> res@mpMaxLatF = max(lat) + 5
> res@mpMinLonF = min(lon) - 5
> res@mpMaxLonF = max(lon) + 5
> res@tiMainString = "Locations of stations"
>
> map = gsn_csm_map(wks,res) ; Create the map plot,
> don't draw
>
> mkres = True
> mkres@gsMarkerIndex = 2
> mkres@gsMarkerColor = "Brown"
>
> gsn_polymarker(wks,map,lon,lat,mkres)
>
> frame(wks)
>
> ;
> ; Zoom in even more on the map.
> ;
> res@mpMaxLatF = 60.
> res@mpMaxLonF = -65.
> res@mpMinLatF = 22.
> res@mpMinLonF = -125.
>
> map = gsn_csm_map(wks,res) ; Create the map plot,
> don't draw
>
> ;
> ; Now attach the markers to the plot and notice that you don't
> ; see them until you draw the plot.
> ;
> ; If you resize the plot, the markers will be resized accordingly.
> ;
> mkres@gsMarkerColor = "Blue"
> mkres@gsMarkerSizeF = 15. ; Increase marker sizes.
>
> dum = gsn_add_polymarker(wks,map,lon,lat,mkres)
>
> draw(map)
> frame(wks)
>
> end
>
> --
> Cecille
>
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Received on Wed Jul 28 09:12:42 2010