[FWTools] cs2cs problem

[Mikhail Tchernychev]

I am really sorry Frank, this is entirely my fault.

I figured it out after installing two other versions from source.

My command strings are not identical. The difference is

Wrong one:

towgs84=43.82,-108.842,119.585,+1.455,-0.761,+0.737,+0.548

Right one

+towgs84=43.82,-108.842,-119.585,+1.455,-0.761,+0.737,+0.548


"119.585" has different sign... I lost it while cutting and pasting from 
the file..

Everything works right, thank you very much for great product!

Thanks again,

Mikhail


On 01/14/2011 06:19 PM, Frank Warmerdam wrote:
> On 11-01-14 08:34 PM, Mikhail Tchernychev wrote:
>>     Hello FWTools users,
>>
>> First of all, thank you for these wonderful tools.
>>
>> Here is my question: if I use cs2cs program from FWTools (2.4.7) shell
>>
>> C:\Program Files\FWTools2.4.7>cs2cs -I -f "%.10f" +from +proj=latlong
>> +datum=WGS84
>> +to +proj=latlong +ellps=krass
>> +towgs84=43.82,-108.842,119.585,+1.455,-0.761,+0.737,+0.548
>>
>> I get the following (input / output)
>>
>> 50.7334137 45.5004868
>> 50.7322097853   45.5020745895 158.7042389987
>>
>> If I use previous version
>>
>> C:\Program Files\FWTools2.4.3>cs2cs -I -f "%.10f" +from +proj=latlong
>> +datum=WGS84
>> +to +proj=latlong +ellps=krass
>> +towgs84=43.82,-108.842,-119.585,+1.455,-0.761,+0.737,+0.548
>>
>> The results are:
>>
>> 50.7334137 45.5004868
>> 50.7322097853   45.5005663276 -11.8877343033
>>
>> As you could see longitude is the same.
>>
>> I also tried proj which comes with QGis, as well as stand alone cygwin
>> version. Second result appeared to be
>> correct.
> Mikail,
>
> Indeed the results from FWTools 2.4.7 are wrong.  It appears no datum
> shift is being applied, just a change of ellipsoid.  I don't know why
> that is the case - modern cs2cs in OSGeo4W or on linux works as expected.
>
> All I can think of is to produce a new FWTools with the latest PROJ.4.
> It is possible you are seeing some sort of transitional bug that was
> introduced and then fixed.  Since I have no immediate plans to produce
> a new FWTools for windows release there isn't much to do but use another
> version for now.
>
> Best regards,
>
>
>