The resolution problem?

[ahching]

Hi,
I try to calculate a 1000m and 500m resolution map with the same region. Why the extreme wind results of 500m resolution are higher than 1000m resolution? Is there any possible explanation?

[Duncan]

Are all of the values systematically higher? That would indicate a problem.

If the maximum values are different between the maps, then it's not so surprising if the nodes of the grid map fall on different co-ordinates. To check this, you can put sites on the exact co-ordinates of the maximum value node in each map, and see what the predicted speed is for each.

[Morten]

The WEng extreme-wind estimates depend on terrain-induces speed-up factors, which are calculated by the flow model. Using a too low resolution will typically result in too little terrain speed-up factors. Setting up a terrain model in WEng is a compromise between grid resolution and domain size with restrictions imposed by the available computer memory. Read more about this at http://www.wasp.dk/Support/FAQ/WENGmaps.html

[ahching]

The web page cannot be found????
Well, sometimes I could not open the project with a high resolution and big size map, but sometimes I could.
So, Is that the problem with the computer memory?!

[Morten]

...I have just fixed the above link