[Proj] convert from Equidistant Cylindrical to Eckert I

[Jose Gonçalves]

An image is georeferenced if there is some form of associating pixel
positions (row, column) to geolocation, in geographic or cartographic
coordinates.
Proj, or any other program that uses proj, needs that to apply map
projection formulas
In your case you must simulate that your image is georeferenced, giving it
an extent of 360 degrees in longitude (row) and some proportional extent in
latitude (column).
Regards

Jose


2016-05-25 0:34 GMT+01:00 Wang Leslie <wqyuwss at hotmail.com>:

> Hi Jose,
>
>
> Thanks for the quick reply.
>
>
> What do you mean "be geo-referenced"? What I'm thinking is to use these
> tools to convert a 360 panorama picture, such as
> https://upload.wikimedia.org/wikipedia/commons/3/35/Space_Needle_360_Panorama.jpg,
> which is an equidistant cylindrical projection, to other type of
> projection, which keeps same quality but with smaller size. Thus I can save
> some storage spaces. In this case, these 360 picture doesn't have any
> geo-referenced data. Can I still use these tools?
>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/proj/attachments/20160525/cb19f8fa/attachment.html>