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 <[email protected]> > 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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