[OSGeo Africa] Noob Question

[Gavin Fleming]

Hey Jaco

Is your SRTM data perhaps in lat/long? If so then the value is metres
elevation change over horizontal distance in degrees expressed as a
percentage, which is a biiig number. The slope values are still correct
as relative values.

Transform your srtm to a projected CRS and you'll get a recognisable %
value (and a more accurate result).

Gavin

On 17/02/2015 12:04, Jaco Engelbrecht wrote:
>
> Hi guys
>
>  
>
> Noob question:
>
>  
>
> I am using a srtm data set.
>
>  
>
> When calculating slope, I figured to set it to percentage. Soo, what
> does this value mean? How do you interpret it in the legend? See pic
> attached.
>
>  
>
> Best Regards,
>
>  
>
>  
>
>  
>
> JACO ENGELBRECHT    
>
> /Viticulturist/
>
>  
>
> C: +27 82 801 3299
>
> E:  jaco at bolandkelder.co.za <mailto:jaco at bolandkelder.co.za>
>
> T:  +27 21 862 6190
>
> F:  +27 86 521 6147
>
> W: _www.bolandcellar.co.za <http://www.bolandcellar.co.za/>_
>
> 	
>
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>
>  
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-- 
Gavin Fleming
t: 0218620670
w: 0218630660
c: 0845965680
f: 0866164820
Paarl
South Africa
18°59'19.6"E 33°44'46.1"S

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