# [Proj] Can I convert the ellipsoids using Proj?

Cleo Drakos cleo21drakos at gmail.com
Tue Aug 19 03:39:23 EST 2014

```Dear Jose

Thanks for your answer. Can you help me how can I make certain that both
ellepsoids have the same geocentric coordinates.
Only the information I am having is below under the section of How does the
GLAS ellipsoid compare with WGS 84?

http://nsidc.org/data/icesat/faq.html#3_all

cleo

On Tue, Aug 19, 2014 at 6:03 AM, Jose Gonçalves <jagoncal at gmail.com> wrote:

> Cleo
>
> If cartesian geocentric coordinates are the same and you just want to
> express them in a different ellipsoid you can do:
>
> cs2cs -f %.9f +a=6378136.30 +rf=298.257 +proj=latlong +towgs84=0,0,0 +to
> +a=6378137 +rf=298.25722356 +proj=latlong +towgs84=0,0,0
>
> If there are shift and rotation you can express them in the +towgs84.
>
> Regards
>
> José
>
>
>
> 2014-08-18 15:13 GMT+01:00 Cleo Drakos <cleo21drakos at gmail.com>:
>
>> Dear guys,
>>
>> I have the data (latitudes, longitudes, and elevations) given in
>> ICESat/GLAS ellipsoid. This equatorial radius and  reciprocal flattening
>> (1/f) on this ellipsoid are 6378136.30 m and is 298.257 respectively.
>>
>> Now, I want to convert my data into WGS84 ellepsoid with equatorial
>> radius and reciprocal flattening (1/f) of 6378137.000000 and 298.25722356
>> respectively.
>>
>> Can I convert the ellipsoids using Proj?
>>
>> I hope some of you can help me.
>>
>> cleo
>>
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>>
>
>
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