[Shake-dev] Question/comment regarding uncertainty map product.

[Bruce Worden]

Hi Renate,

The reason I introduced urat_pga.ps was specifically to replace sd.jpg. I didn't want sd.jpg to disappear suddenly, however, because I didn't know if anyone was using sd.jpg in some hardwired way. So we're in a sort of transition period. The reason for the name change is twofold: 1) it's not really a plot of standard deviation, but uncertainty ratio, and 2) putting "pga" in the name allows us to add maps for the other parameters, if we choose to do so. That said, I'm not sure there is a big advantage to making the other maps. The PGA map was designed to allow us to grade the map quality, and there's not generally going to be meaningful differences between the parameters. Still, if there is a demand, I can add the other figures.

I have recently added, but not announced, a new output file called uncertainty.xml. It it structured very much like grid.xml, but contains grids of calculated uncertainties for each parameter. 

I'm not sure how useful the relative contribution grids would be to the general ShakeMap consumer. They can go on the products pages if, again, people think they would be of use to the general consumers, but I assumed their use would mostly be confined to network/ShakeMap operators. If I had to guess, I'd say that most regions don't even generate them. But, again, if there is a demand, we can add them to the products.

Bruce


On Aug 18, 2011, at 11:39 AM, Renate Hartog wrote:

> 
> Hi Bruce,
> 
> In the ShakeMap web products I see sd.jpg and urat_pga.jpg, which are the same thing. Shall we just get rid of the sd.jpg file? (or urat_pga.jpg, and rename urat_pga.ps to sd.ps) Also, on the uncertainty map it should probably say that it is only the uncertaintity ratio of the PGA values, not of MI,PGV,PSA03,PSA10,PSA30. Or am I wrong about that? If  not wrong, the question arises whether it would be a good thing for ShakeMap to output uncertainty maps for all ground motion parameters. Perhaps this is already configurable and I just haven't found where...source code suggests only uncertainty ratio of pga is calculated.  The relative contribution grids have a lot of information, but are not part of the "products".
> 
> thanks, Renate
> 
> -- 
> Renate Hartog
> Research Scientist
> Pacific Northwest Seismic Network
> Department of Earth and Space Sciences
> University of Washington
> Box 351310
> Seattle, WA 98195
> 
> Tel. +1-206-685-7079 (office)
> 
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