Hi,

I wish to use the cost distance calculation to calculate the accumulated least cost of travelling from river bank to any point in dem.

The Cost distance calulation adds each cell value in the least cost path together to give a cell value.

However,I want to get the value of the difference between the elevation of the least cost path point of origin on the river bank and its respective cell value in the dem. This would give a measure of the cell elevation in respect of its closest point height wise on the river bank.

So for instance, calculate if the cell is 10 metres higher than the cell on the river bank you would arrive at by following the least cost path to the river from it.

How can I acheive this?

Thanks,

Liam

I wish to use the cost distance calculation to calculate the accumulated least cost of travelling from river bank to any point in dem.

The Cost distance calulation adds each cell value in the least cost path together to give a cell value.

However,I want to get the value of the difference between the elevation of the least cost path point of origin on the river bank and its respective cell value in the dem. This would give a measure of the cell elevation in respect of its closest point height wise on the river bank.

So for instance, calculate if the cell is 10 metres higher than the cell on the river bank you would arrive at by following the least cost path to the river from it.

How can I acheive this?

Thanks,

Liam

I am thinking that through running a neighbourhood statistics 3X3 Rectangular minimum function on the dem and subtracting these values from the original dem. I will get the cost of moving to the lowest cell value in the proximity of the central cell. This can then be used as the cost raster to sum the least cost elevation change by moving through adjacent cells to the source for the analysis. I would be interesting in hearing any opinions as to the validity of this approach.

Thanks,

Liam