[gradsusr] Help with area average script to calculate height for specific locations

[Roberto Mera]

All,

I have a script that allows me to process a text file of latitude longitudes (stations) and I'm trying to output area averages of a particular file based on the points generated from the text file.

I'm basically calculating the grid point spatially associated with a specific station.

So far it works to give me the x1, x2, y1, y2 but I can't make it loop over all the points for area average of the gridded file.

My version of grads: Config: v2.0.a9.oga.1 little-endian readline printim grib2 netcdf hdf4-sds hdf5 opendap-grids,stn athena geotiff shapefile

Here is the script (some of the material is likely obsolete as I got the code from an earlier project):

function main(arg)

file = subwrd(arg,1)
size = subwrd(arg,2)
color = subwrd(arg,3)

record = read(file)

record = sublin(record,2)

i = 0

counter = record

while(i < counter)

  record = read(file)

  record = sublin(record,2)

  ilat0 = subwrd(record,2)
  ilon0 = subwrd(record,1)
  ilon1 = subwrd(record,3)
  ilat1 = subwrd(record,4)


*say ilon0 ilat0 ilon1 ilat1

 linia(ilat0,ilon0,ilon1,ilat1,size,color)

  i = i + 1

endwhile

return

  function linia(lon0,lat0,lon1,lat1,size,color)
* Draws a line limited by two circles in _color
    'set line 'color
    'q w2gr 'lon0' 'lat0
*    'q w2xy 'lon0' 'lat0
    x0=subwrd(result,3)
    y0=subwrd(result,6)
    xlo=x0-0.0540406
    xhi=x0+0.0540406
    ylo=y0-0.0540406
    yhi=y0+0.0540406
*   say x0' 'y0' 'lon0' 'lat0
*    say xlo' 'xhi' 'ylo' 'yhi
    'areal=aave(ht,x='xlo',x='xhi',y='ylo',y='yhi')'
    'd areal'
    areal=subwrd(result,6)
    say 'areal'
*'q w2xy 'lon1' 'lat1
*x1=subwrd(result,3)
*y1=subwrd(result,6)
*'draw line 'x0' 'y0' 'x1' 'y1
*    'draw mark 3 'x0' 'y0' 'size''
*'draw mark 3 'x1' 'y1' .07'
  return
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