[Marxan] cost layer from multible sources

Trevor Wiens tsw.web at gmail.com
Thu Jan 12 00:33:34 EST 2012

Using raster algebra is certainly the simplest technical approach to creating a single cost layer. However the challenge is really determining the logical means by which to merge those different costs into a single cost layer. 

Can you explain in more detail why the two costs couldn't be merged? 

For example if they are to have equal weight why not scale them both from zero to 0.5 and then add them. Or if one is supposed to be worth 2/3 and the other 1/3 again scale them appropriately and add them. 

Trevor Wiens
Sent from my mobile

On 2012-01-11, at 4:47, Husam El Alqamy <alqamy at gmail.com> wrote:

> Dear List
> I have a question and hope to find an answer at yours. If I have 2 polygon data datasets (fishing rights areas  and oil fields) and I want to produce a cost layer using those 2 data elements, is this possible? I figured that converting them to raster layers and summing them would be a way around it but unfortunately I couldn’t account for the different types of cost on a single scale. Could you please kindly advise.
> Really appreciate it
> -- 
> Husam El Alqamy, B.Sc., M.Phil.
> Sr. Biodiversity GIS Analyst ,
> Environmental Information Sector, EIS
> Environmental Agency Abu Dhabi,UAE 
> Antelope Specialist Group, ASG - IUCN
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