[Qgis-user] Measuring unit of $lenght / Unidad de medida de $lenght

[Pablo Schweitzer]

Thanks Alex...
Perhaps the unit of measurement is "degrees". In Ecuador the circumference of
the earth is 40,076 km. 40076/360 ° = 109.79. But the equivalence degrees =
km varies with latitude and longitude. So use a conversion factor is very
difficult in large countrys lake Argentina :-(

In

You can change the unit of measure?

Thanks

Pablo



2012/9/20 Alex Mandel <tech_dev at wildintellect.com>

> On 09/20/2012 09:30 AM, Pablo Schweitzer wrote:
> > Hola
> >
> > When calculating the length of a line layer ($ lenght), a segment is
> > measured as 0.0599837538499966, but using the measuring tool is 5.8 km.
> > Obviously somewhere I have a configuration problem with the unit of
> > measurement of the $ lenght. Could anyone guide me how to make length
> measured
> > in miles? (obviously I can make the value is $ lenght x 100 but is not
> the
> > idea)
> >
> > Cuando calculo el largo de una capa de líneas ($lenght), a un segmento lo
> > mide como de 0.0599837538499966, pero si uso la herramienta medir is
> 5,8km.
> > Evidentemente en algún lugar tengo un problema de configuración con la
> > unidad de medida de la función $lenght. ¿Alguien podría orientarme como
> > hacer para que length mida en km? (obviamente puedo hacer que el valor
> sea
> > $lenght x 100 pero no es la idea)
> >
> > Gracias
> >
> > Pablo
> >
> >
> >
>
> The $length calculation is using the native units of the projection (a
> guess), the Measure Tool is converting to more human readable measurements.
>
> You can change between metric and feet in the project properties or QGIS
> options if you want to get miles. Just look for the measure units
> choices. I'm not sure if this will change the results of the calculator,
> for that you might need to multiply by the conversion factor yourself as
> part of the formula.
>
> Thanks,
> Alex
>
>
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