[Proj] Problem with program on Windows
Frank Willett
fyw at wwwtools.com
Wed Aug 10 11:41:41 EST 2011
Thanks,
My confusion was the difference between tmerc and utm.
BTW: I was inputing (0, 0).
When I switched to tmerc all is well.
Thanks again :-)
Frank
On Aug 10, 2011, at 10:25 AM, Frank Warmerdam wrote:
> On Wed, Aug 10, 2011 at 9:09 AM, Frank Willett <fyw at wwwtools.com> wrote:
>> I'm running Windows 7 Ultimate 64 and have cygwin installed.
>>
>> I downloaded the proj.4 Windows binary distribution and tried the following command:
>>
>> proj.exe +proj=utm +ellps=clrk66 +lon_0=0 +lat_0=0 +x_0=500000 +y_0=0 +units=m
>>
>> expecting an answer of (500000.00, 0.00) and got (166017.00, 0.00)
>
> Frank,
>
> You have not indicated what user input you gave, so it is hard to be
> sure what the correct output should be. However, I will note that it
> is not normal to try and specify the detailed parameters like +lon_0,
> +lat_0, +x_0 and +y_0 with +proj=utm. With UTM you should provide
> a +zone. If you want to specify the transverse mercator projection
> yourself then just use +proj=tmerc instead.
>
> Best regards,
> --
> ---------------------------------------+--------------------------------------
> I set the clouds in motion - turn up | Frank Warmerdam, warmerdam at pobox.com
> light and sound - activate the windows | http://pobox.com/~warmerdam
> and watch the world go round - Rush | Geospatial Software Developer
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