[Gdal-dev] gdalwarp parameters

[Brent Fraser]

Shoaib,

Have a look at
http://www.remotesensing.org/geotiff/proj_list/mercator_1sp.html

Try using +lat_ts:

 "+proj=merc +lat_ts=45 +lat_0=0.0 +lon_0=-180 +x_0=0 +y_0=0 +datum=WGS84
+ellps=WGS84 +units=m"

Brent Fraser
GeoAnalytic Inc
Calgary, Alberta, Canada


----- Original Message ----- 
From: "Shoaib Burq" <hydromap at gmail.com>
To: <gdal-dev at lists.maptools.org>
Sent: Monday, May 08, 2006 8:07 AM
Subject: [Gdal-dev] gdalwarp parameters


> Hi
>
> I want to reproject an image which is currently in NAD83 Z21 to a
> custom projection.
> I am having some trouble getting the proj4 parameters to a custom
> projection right.
> I have been given the ArcGRID's prj.adf file and it looks like this:
>
>
> Projection    MERCATOR
> Datum         WGS84
> Spheroid      WGS84
> Units         METERS
> Zunits        NO
> Xshift        0.0
> Yshift        0.0
> Parameters
> -180  0  0.0 /* longitude of central meridian
>   45  0  0.0 /* latitude of true scale
> 0.0 /* false easting (meters)
> 0.0 /* false northing (meters)
>
> Could some one please suggest the correct proj4 directive to give to
> gdalwarp's -t_srs ?
>
> I have tried
>   "+proj=merc +lat_0=45.0 +lon_0=-180 +x_0=0 +y_0=0 +datum=WGS84
> +ellps=WGS84 +units=m"
> but this is not giving me the correct extents.
>
> Thanks for any pointers
> shoaib
>
> _______________________________________________
> Gdal-dev mailing list
> Gdal-dev at lists.maptools.org
> http://lists.maptools.org/mailman/listinfo/gdal-dev