[Proj] Convert MODIS Sinusoidal to WGS84

[Juergen Stumpe]

Hi Kristian,

Thanks for the fast reply and explanation. It works.

Is there also an option to specify the output format? In the given
example, the output format is DMS.

To get the result in decimal degrees (DD), is there an PROJ parameter
option to specify the output to be in DD,
or is an additional, separate PROJ conversion needed, to convert from DMS to DD?

Bye,

Juergen

On Tue, Mar 27, 2018 at 12:23 PM, Kristian Evers <kreve at sdfe.dk> wrote:
> Hi Jürgen,
>
> Try this instead:
>
> $ echo 4447802.078667 -1111950.519667 | cs2cs +proj=sinu +to +proj=latlong
> +datum=WGS84
> 40d34'27.915"E  10d3'18.399"S 0.000
>
> WGS84 is not an operation in PROJ. It is however a recognised as a datum
> that can be used in
> conjunction with an operation such as “latlong”.
>
> Since what you are doing is really just converting projected sinusoidal
> coordinates to it’s originating
> latitude and longitude you can also just do
>
> $ echo 4447802.078667 -1111950.519667 | proj -I +proj=sinu
> 40d34'27.915"E 10d3'18.399”S
>
> To reach the same result.
>
> /Kristian
>
> On 27 Mar 2018, at 12:13, Juergen Stumpe <jstumpe.ho at gmail.com> wrote:
>
> Hello,
>
> I'm trying to convert Modis meter values to WGS84 decimal degrees,
> using the PROJ4 command line, but I'm not able to set the parameters
> correctly.
>
> E.g. the command "echo 4447802.078667 -1111950.519667 | cs2cs
> +proj=sinu +to +proj=WSG84" fails with "projection initialization
> failurecause: Unknown error".
>
> Does anybody know how the define the PROJ4 command line properly, in
> order to achieve a conversion with parameters according the attached
> TWCC screen shot?
>
> Thanks in advance!
>
> Juergen
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