[Qgis-user] line in dem from max to min

[Nicolas Cadieux]

Hi, 
I would have a column ID each polygon or multipolygone with a unique name.  I would then densify  the geometry to create new vertex along the line then extract these vertex to a point layer.  I would then use the point value plugin to extract the value of the DEM for each point and then use a group statistic (grouping with the polygon name field) to get the min and max value for each object. 
Nicolas Cadieux M.Sc. 
Les Entreprises Archéotec inc.  
8548, rue Saint-Denis Montréal H2P 2H2 
Téléphone: 514.381.5112  Fax: 514.381.4995 
www.archeotec.ca 
On Jul 7, 2015 7:50 AM, "v.botz [via OSGeo.org]" <ml-node+s1560n5214619h50 at n6.nabble.com> wrote: 

	Hi,
i have some geometrys (multipolygon) and a dem (digital elevation model)
-> I need a line from the max value to the lowest value of the dem, for every multipolygon
is qgis a tool i could use - or do i need PostGIS ?
how could i realize this problem ??
any ideas?  THANKS

	
	
	
	
	
	
	
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