How do I define the Boundary Length Modifier (BLM) prior to the SPOT run?
The simple answer is experimentation. The final settings prior to the SPOT run include the Boundary Length Modifier which in essence is the factor that balances the boundary component of the cost equation. The BLM takes the values of the boundaries of the analysis units and makes them comparable to the other two components of the cost equation (base cost and target penalty cost). Higher BLM values make the boundary cost be the most important component of the equation, and thus obligates SPOT to concentrate the cost reduction focus on the boundaries. Higher BLM values will increase connectivity and decrease fragmentation. An unsually high BLM value will often result in a portfolio of one analysis unit. Lower BLM values will decrease the importance of the boundaries and makes the other two components more important. Thus, lower BLM values will decrease connectivity and increase fragmentation. You need to experiment with the BLM value so as to balance the cost equation so that SPOT is abl
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