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Overplot non-gridded vector data on map using MSVELOVECT.pro [message #56593]

Mon, 05 November 2007 16:55

Tyler
Messages: 5
Registered: September 2007

Junior Member

Hello All:

I am attempting to plot some GPS station velocity vectors over some
existing data on a map. I found the MSVELOVECT procedure which seems
to do what I want. However, I am struggling to understand how to use
it. In particular, how to set up the velocity vectors, U & V.

The data I have is:

1) GPS station LON/LAT values
2) East magnitude of velocity
3) North magnitude of velocity

The program requires the velocity data be in 2-D, but I am unsure what
the first dimension value is or the second dimension. Does anyone know
how to use this?

I have provided below a snippet of how I tried to set up the data by
fooling it with a data vector for U & V, but it was smarter than me.

Or am I using the wrong program altogether?

Any help is greatly appreciated.

Cheers,

t.

IF (zc EQ 0) THEN BEGIN
U = FLTARR(long(NV), 1, /NO)
V = FLTARR(long(NV), 1, /NO)
X = FLTARR(long(NV), /NO)
Y = FLTARR(long(NV), /NO)

;; Northern Section
;; East Velocity
U(0,0) = -2.44
U(1,0) = -1.82

;; North velocity
V(0,0) = 2.66
V(1,0) = 2.11

;; GPS Station Lon
X(0) = -123.8352
X(1) = -123.0747

;; GPS Station Lat
Y(0) = 39.7769
Y(1) = 38.9952
;; Overplot the GPS data
MSVELOVECT, U, V, X, Y, COLOR = !P.COLOR, /OVERPLOT
ENDIF

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[Message index]

		Overplot non-gridded vector data on map using MSVELOVECT.pro By: Tyler on Mon, 05 November 2007 16:55
		Re: Overplot non-gridded vector data on map using MSVELOVECT.pro By: Spon on Wed, 07 November 2007 10:17

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