[ncl-talk] Plotting Lat/Lon Points on a map
Tim Melino
melino33 at gmail.com
Sun May 28 07:52:50 MDT 2017
Hey Barry,
The only information about the projection was: *grid_type :
Latitude/Longitude. *I attached the file!
Tim
On Sun, May 28, 2017 at 9:00 AM, Barry Lynn <barry.h.lynn at gmail.com> wrote:
> Tim:
>
> Please remind me what the name of the file is.
>
> Also, was there any information at the top of the printing about the
> projection?
>
> Yes, the markers would (could) look off.
>
> On Sun, May 28, 2017 at 3:32 PM, Tim Melino <melino33 at gmail.com> wrote:
>
>> Hi Barry,
>>
>> Here is the information when printing (a). Would the map projection also
>> cause a marker to be printed in the wrong location?
>>
>> Variable: a
>> Type: file
>> filename: test
>> path: ./test.grib2
>> file global attributes:
>> dimensions:
>> lat_0 = 30
>> lon_0 = 40
>> variables:
>> float VAR_209_3_34_P0_L102_GLL0 ( lat_0, lon_0 )
>> center : US NOAA Office of Oceanic and Atmospheric Research
>> production_status : Research products
>> long_name : unknown variable name
>> units : unknown
>> _FillValue : 1e+20
>> grid_type : Latitude/longitude
>> parameter_discipline_and_category : 209, 3
>> parameter_template_discipline_category_number : ( 0,
>> 209, 3, 34 )
>> level_type : Specific altitude above mean sea level (m)
>> level : 500
>> forecast_time : 0
>> forecast_time_units : minutes
>> initial_time : 07/09/2016 (04:46)
>>
>> float lat_0 ( lat_0 )
>> long_name : latitude
>> grid_type : Latitude/Longitude
>> units : degrees_north
>> Dj : 0.01
>> Di : 0.009999676
>> Lo2 : 280.735
>> La2 : 36.695
>> Lo1 : 280.345
>> La1 : 36.405
>>
>> float lon_0 ( lon_0 )
>> long_name : longitude
>> grid_type : Latitude/Longitude
>> units : degrees_east
>> Dj : 0.01
>> Di : 0.009999676
>> Lo2 : 280.735
>> La2 : 36.695
>> Lo1 : 280.345
>> La1 : 36.405
>>
>>
>> On Sun, May 28, 2017 at 12:48 AM, Barry Lynn <barry.h.lynn at gmail.com>
>> wrote:
>>
>>> Hi:
>>>
>>> When the data is skewed, it is often because the projection you're
>>> reading is not the one your plotting.
>>>
>>> Do you know the projection of the data you're using?
>>>
>>> If you print(a) where a is the file you specify from addfile, you can
>>> see the variables (and hopefully projection) indicated within.
>>>
>>> Barry
>>>
>>> On Sat, May 27, 2017 at 4:20 PM, Tim Melino <melino33 at gmail.com> wrote:
>>>
>>>> Hi,
>>>>
>>>> I am attempting to plot a subset of the MRMS data from NCEP. The
>>>> latitude and longitude I am plotting is :
>>>>
>>>> LAT: 36.5459089
>>>> LON: -79.4585847
>>>>
>>>> I attached an image of the output along with the grib file I am using
>>>> for input. I am noticing a couple things first the data appears to be
>>>> skewed, so I am not sure if it is an issue with the map projection. Second
>>>> the point which should be plotted in Virginia is actually plotted in North
>>>> Carolina, the only thing that I have been able to do if offset the marker
>>>> to compensate for the issue. Does anyone have any ideas on how to fix these
>>>> issues? Any ideas would be greatly appreciated!
>>>>
>>>> Thanks!
>>>> Tim
>>>>
>>>> Code:
>>>>
>>>> load "$NCARG_ROOT/lib/ncarg/nclscripts/wrf/WRFUserARW.ncl"
>>>> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
>>>> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"
>>>>
>>>> begin
>>>>
>>>> lati=LAT
>>>> loni=LON
>>>> date=DATE
>>>> address=ADDRESS
>>>>
>>>>
>>>> ; Convert the Lat/Lon to a Float
>>>> latc= stringtofloat(lati)
>>>> lonc = stringtofloat(loni)
>>>>
>>>> ; Set the Map Bounds
>>>> minlat = latc - .12
>>>> maxlat = latc + .12
>>>> minlon = lonc - .15
>>>> maxlon = lonc + .15
>>>>
>>>>
>>>> ;========================
>>>> ; get list of all files and open as "one big file"
>>>> ;========================
>>>> a = addfile( "./" + lati + "_" + loni + ".grib2","r")
>>>>
>>>> type = "png"
>>>> wks = gsn_open_wks(type,"./" + lati + "" + loni + ".png")
>>>>
>>>> ; Set some Basic Plot options
>>>> res = True
>>>> res at gsnDraw = False ; do not draw the plot
>>>> res at gsnFrame = False ; do not advance the
>>>> frame
>>>> pltres = True
>>>> pltres at NoTitles = True
>>>> pltres at CommonTitle = True
>>>> pltres at PlotTitle = ""
>>>> pltres at PanelPlot = True
>>>> pltres at FramePlot = False
>>>>
>>>> ; Set the Colormap
>>>> gsn_define_colormap(wks,"hail")
>>>> lat = a->lat_0
>>>> lon = a->lon_0
>>>> water = a->VAR_209_3_34_P0_L102_GLL0(:,:)
>>>> hail = water *0.0393701;
>>>>
>>>>
>>>> ; Plotting options for Hail
>>>> res at gsnMaximize = True
>>>> res at mpGeophysicalLineThicknessF = 4.0
>>>> ;res at mpProjection = "LambertConformal"
>>>> res at mpGridLineThicknessF = 0.5
>>>> res at mpLimbLineThicknessF = 4.0
>>>> res at mpNationalLineThicknessF = 4.0
>>>> res at mpUSStateLineThicknessF = 4.0
>>>> res at mpProvincialLineThicknessF = 4.0
>>>> res at mpOutlineBoundarySets = "AllBoundaries"
>>>> res at mpDataBaseVersion = "Ncarg4_1"
>>>> res at mpDataSetName = "Earth..4"
>>>> res at mpFillOn = False ; fill continents
>>>> res at mpPerimOn = False ; no box around map
>>>> res at tiMainOn = True
>>>> res at tiMainFontColor = "Black"
>>>> res at tiMainString =""
>>>> res at tiXAxisString = ""
>>>> res at tiYAxisString = ""
>>>> res at gsnLeftString = "Date: " + date ; add the gsn
>>>> titles
>>>> res at gsnRightString = ""
>>>> res at gsnStringFontHeightF = 0.016
>>>> res at cnInfoLabelOrthogonalPosF = 0.07 ; offset second label
>>>> information
>>>> res at gsnContourLineThicknessesScale = 0.001
>>>> res at cnFillOn = True
>>>> res at lbTitleOn = True ; remove field
>>>> name from label bar
>>>>
>>>> ; Set the Map Bounds
>>>> res at sfYArray = lat
>>>> res at sfXArray = lon
>>>> res at mpLimitMode = "LatLon"
>>>> res at mpMinLatF = minlat
>>>> res at mpMaxLatF = maxlat
>>>> res at mpMinLonF = minlon
>>>> res at mpMaxLonF = maxlon
>>>> res at tmXBOn = False
>>>> res at tmYLOn = False
>>>> res at tmXTOn = False
>>>> res at tmYROn = False
>>>> res at gsnAddCyclic = False
>>>> res at tfDoNDCOverlay = False ; do not
>>>> transform data
>>>> res at cnLevelSelectionMode = "ExplicitLevels" ; set explicit
>>>> contour levels
>>>> res at cnLevels = (/ 0.5,0.75, 1.00, 1.25, 1.50, 1.75, 2.00,
>>>> 2.50, 3.00, 3.50, 4.00, 4.50, 5.00/) ; set levels
>>>> res at tiMainFontHeightF = 0.018 ; font height
>>>> of title
>>>> res at lbAutoManage = False ; we control
>>>> label bar
>>>> res at pmLabelBarDisplayMode = "Always" ; turns on label
>>>> bar
>>>> res at lbOrientation = "Horizontal" ; ncl default is
>>>> vertical
>>>> res at pmLabelBarSide = "Bottom" ; default is
>>>> right
>>>> res at lbLabelStride = 1 ; skip every
>>>> other label
>>>> res at pmLabelBarWidthF = 0.7 ; default is
>>>> shorter
>>>> res at pmLabelBarHeightF = 0.1 ; default is
>>>> taller
>>>> res at lbLabelFontHeightF = .012 ; default is HUGE
>>>> res at lbPerimOn = False ; default has box
>>>> res at lbTitleString = "Hail Size (Inches)"
>>>> res at lbTitleFontHeightF = 0.012
>>>> plot = gsn_csm_contour_map(wks,hail,res)
>>>>
>>>> ; Setup the point
>>>> mstring1 = "z"
>>>> fontnum1 = 35
>>>> xoffset1 = .4
>>>> yoffset1 = .7
>>>> ratio1 = 0.0
>>>> size1 = 1.0
>>>> angle1 = 0.0
>>>>
>>>> Tm_index = NhlNewMarker(wks, mstring1, fontnum1, xoffset1, yoffset1,
>>>> ratio1, size1, angle1)
>>>>
>>>> ; Plot the sites and label them
>>>> gres = True
>>>> gres at gsMarkerIndex = Tm_index ; 16
>>>> gres at gsMarkerSizeF = 0.015 ; .009
>>>> gres at gsMarkerColor = "black"
>>>> gres at txFont ="helvetica-bold"
>>>> gres at txFontHeightF = "25"
>>>>
>>>> site = (/address/)
>>>> lats = (/latc/)
>>>> lons = (/lonc/)
>>>>
>>>> dot = gsn_add_polymarker(wks,plot,lons,lats,gres)
>>>> tlats =lats + .03
>>>> tlons =lons
>>>> text = gsn_add_text(wks,plot,site,tlons,tlats ,gres)
>>>>
>>>> ; Draw the graphics
>>>> draw(plot)
>>>> frame(wks)
>>>>
>>>> end
>>>>
>>>>
>>>> _______________________________________________
>>>> ncl-talk mailing list
>>>> ncl-talk at ucar.edu
>>>> List instructions, subscriber options, unsubscribe:
>>>> http://mailman.ucar.edu/mailman/listinfo/ncl-talk
>>>>
>>>>
>>>
>>>
>>> --
>>> Barry H. Lynn, Ph.D
>>> Senior Lecturer,
>>> The Institute of the Earth Science,
>>> The Hebrew University of Jerusalem,
>>> Givat Ram, Jerusalem 91904, Israel
>>> Tel: 972 547 231 170
>>> Fax: (972)-25662581
>>>
>>> C.E.O, Weather It Is, LTD
>>> Weather and Climate Focus
>>> http://weather-it-is.com
>>> Jerusalem, Israel
>>> Local: 02 930 9525
>>> Cell: 054 7 231 170
>>> Int-IS: x972 2 930 9525
>>> US 914 432 3108 <(914)%20432-3108>
>>>
>>
>>
>
>
> --
> Barry H. Lynn, Ph.D
> Senior Lecturer,
> The Institute of the Earth Science,
> The Hebrew University of Jerusalem,
> Givat Ram, Jerusalem 91904, Israel
> Tel: 972 547 231 170
> Fax: (972)-25662581
>
> C.E.O, Weather It Is, LTD
> Weather and Climate Focus
> http://weather-it-is.com
> Jerusalem, Israel
> Local: 02 930 9525
> Cell: 054 7 231 170
> Int-IS: x972 2 930 9525
> US 914 432 3108 <(914)%20432-3108>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://mailman.ucar.edu/pipermail/ncl-talk/attachments/20170528/7cb96f51/attachment.html
-------------- next part --------------
A non-text attachment was scrubbed...
Name: 36.5459089_-79.4585847.grib2
Type: application/octet-stream
Size: 929 bytes
Desc: not available
Url : http://mailman.ucar.edu/pipermail/ncl-talk/attachments/20170528/7cb96f51/attachment.obj
More information about the ncl-talk
mailing list