Dear all,
We received an email suggesting that a parameter was missing from the CF
polar stereographic projection documentation. Can anyone clear this up?
thanks,
Karl
Sue Dettling wrote:
>
> I am wondering if you are missing an arguement from the Polar
stereographic projection documentaion
>
(
http://cf-pcmdi.llnl.gov/documents/cf-conventions/1.0/apf.html#id2976188)
>
> You list the following parameters for the projection:
> 1) straight_vertical_longitude_from_pole
> 2) latitude_of_projection_origin - Either +90. or -90.
> 3) Either standard_parallel or scale_factor_at_projection_origin
> 4) false_easting
> 5) false northing
>
>
> The proj4 reference
http://www.remotesensing.org/geotiff/proj_list/polar_stereographic.html
lists the following:
>
> +lat_ts=Latitude at natural origin
> +lat_0=90
> +lon_0=Longitude at natural origin
> +k_0=Scale factor at natural origin (normally 1.0)
> +x_0=False Easting
> +y_0=False Northing
>
>
> In reading both pages it seems the corresponence of args is:
> +lat_ts == ???
> +lat_0 == (2) latitude_of_projection_origin
> +lon_0 == (1) straight_vertical_longitude_from_pole
> +k_0 == (3) scale_factor_at_projection_origin
> +x_0=False Easting == (4) false_easting
> +y_0=False Northing == (5) false northing
>
> Is this an error in the documentation that there doesnt seem to be a
map parameter for lat_ts?
>
> Thanks, your response is greatly appreciated,
>
> Sue
Received on Thu Mar 06 2008 - 10:14:52 GMT
