[Marxan] cost layer from multible sources

Leif Olson leif.olson at o2design.com
Thu Jan 12 07:38:05 EST 2012


Its also important to give some thought to the spatial autocorrelation of the various cost layers, in addition to the absolute values of the combined costs. Costs which are the product of non-stationary spatial functions may introduce some bias into the distribution of the final cost layer...

LEIF OLSON
Landscape Ecologist

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From: marxan-bounces at lists.sps.uq.edu.au [mailto:marxan-bounces at lists.sps.uq.edu.au] On Behalf Of Matt Perry
Sent: 11 January 2012 10:31
To: Husam El Alqamy; marxan at lists.science.uq.edu.au
Subject: Re: [Marxan] cost layer from multible sources

As you mentioned, the cost data needs to be on a single scale. Combining two cost datasets can be handled by a) assigning actual monetary costs to the selection of those areas and summing the dollar amounts or b) normalizing the data to an arbitrary index (e.g. 0 to 100) before summing. Either way, you must make assumptions about the relative importance of the two costs in order to combine them into a single measure.

Hope this helps.

·´¯`·.¸. , . .·´¯`·.. ><((((º>`·.¸¸.·´¯`·.¸.·´¯`·...¸><((((º>
Matthew Perry | Senior Applications Developer | Ecotrust
mperry at ecotrust.org<mailto:jtutak at ecotrust.org>  | 503.467.0817 | ecotrust.org<http://www.ecotrust.org/>


From: marxan-bounces at lists.sps.uq.edu.au [mailto:marxan-bounces at lists.sps.uq.edu.au] On Behalf Of Husam El Alqamy
Sent: Wednesday, January 11, 2012 3:47 AM
To: marxan at lists.science.uq.edu.au
Subject: [Marxan] cost layer from multible sources


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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