[Proj] Proj4 Projection Coordinates for Geostationary satellite data

support.mn at elisanet.fi support.mn at elisanet.fi
Tue Aug 13 02:12:10 EST 2013


we just discarded all points outside any reasonable area.
Another possibility might be to draw a limiting line (or box)
and move all outside points to that..

Hope that helps?

Regards: Janne.


Kathryn Jablonski - NOAA Affiliate [kathryn.jablonski at noaa.gov] kirjoitti: 
> I am trying to convert geographic coordinates (in degrees east/north lat
> lon) to projected coordinates in meters for geostationary full disc data
> (GVAR Goes East data from CLASS).  To do this, I tried using PyProj/ Proj4
> and am running into errors due to the off earth pixels in the corners.
> This is the proj4 string given:
>  projection_coords = Proj("+proj=geos +h=35774290 +a= 6378137 +b= 6378137
> +lon_0=-75 +units=meters +no_defs")
> ll_x, ll_y = projection_coords_geos( LL_y_deg, LL_x_deg, inverse = False,
> errcheck=True)
>     'x=%9.3f y=%11.3f' % (ll_x,ll_y)
>     ur_x,ur_y = projection_coords_geos( UR_y_deg, UR_x_deg, inverse =
> False, errcheck=True)
>  'x=%9.3f y=%11.3f' % (ur_x,ur_y)
> For full disc geos data I am receiving incorrect (1e30) values for the
> extents and was wondering if anyone has ever run into the same error or
> have a suggestion to correct this.
> Also, for remapping GOES data, should the 'sweep axis' be including in the
> Proj string and set to 'y'?
> Thanks in advance for any suggestions!
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