[Proj] Converting to WGS84 Latitude/Longitude

[Charles Clercq]

Dear all,

I found a pdf document: http://www.yale.edu/ceo/Documentation/MODIS_data.pdf

which state: "The data are provided in the HDF-EOS format. MODIS data at
version 4 and above use
the Sinusoidal projection with the WGS84 datum. A very small sample of
common
products are listed below."

Hope it helps


2014-10-24 9:30 GMT+02:00 Artur Bercik <vbubbly21 at gmail.com>:

>
>
> On Fri, Oct 24, 2014 at 3:50 PM, Mikael Rittri <Mikael.Rittri at carmenta.com
> > wrote:
>
>>   Hi Artur.
>>
>>
>>
>> It could be the same thing. “Geodetic” latitude is the same as ordinary,
>>
>> everyday latitude. There are some other flavours of latitude as well,
>>
>> auxiliary latitudes that are mainly used to simplify some kinds of
>>
>> computations, but “geodetic” is the ordinary kind.
>>
>>
>>
>> For longitudes, there is only one flavour, but the zero meridian is
>>
>> not always Greenwich.
>>
>>
>>
>> So the coordinates you mention could be in WGS84 Lat/Long already.
>>
>> But it is not certain, since they could be expressed in some other
>>
>> geodetic datum that uses a different ellipsoid.
>>
>>
>>
>> Do you have any documentation about the geodetic datum of your
>> coordinates (like Pulkovo 1942, Pulkovo 1995, PZ 1990, or WGS84),
>>
>> or about the ellipsoid used?
>>
>
> Dear Mikael Rittri
>
> Thanks for your answer.
> Actually, I could not understand which datum or ellepsoid was used. The
> following documents says only geodetic latitude and longitude:
>
> http://modaps.nascom.nasa.gov/services/about/products/MOD03.html
>
> I have read the above data product; and retrieved the pairs of geodetic
> lats and lons as the document says, but could not figure out if  I should
> convert them into WGS84 or not. I have to compare the data using above
> product with other data which are in WGS84 lats and lons.
>
>>
>>
>> Best regards,
>>
>>
>>
>> Mikael Rittri
>>
>> Carmenta
>>
>> Sweden
>>
>> http://www.carmenta.com
>>
>>
>>  ------------------------------
>>
>> *From:* proj-bounces at lists.maptools.org [mailto:
>> proj-bounces at lists.maptools.org] *On Behalf Of *Artur Bercik
>> *Sent:* Friday, October 24, 2014 8:27 AM
>> *To:* proj at lists.maptools.org
>> *Subject:* [Proj] (no subject)
>>
>>
>>
>> Dear Proj list members:
>>
>> Being a very new in this field, could someone answer me about the
>> following problem:
>>
>> I have a pair of Geodetic Latitude and Geodetic Longitude (50.89524,
>> 117.69043).
>> How can I convert it into Latitude and Longitude with WGS84 Ellepsoid?
>>
>> Thanks in the advance.
>>
>> Artur
>>
>> _______________________________________________
>> Proj mailing list
>> Proj at lists.maptools.org
>> http://lists.maptools.org/mailman/listinfo/proj
>>
>
>
> _______________________________________________
> Proj mailing list
> Proj at lists.maptools.org
> http://lists.maptools.org/mailman/listinfo/proj
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.maptools.org/pipermail/proj/attachments/20141024/61821d5c/attachment-0001.htm