Jump to content
Sign in to follow this  
Xihuitl

Radar or Satellite - Which is more accurate?

Recommended Posts

Hi

 

I'm developing a forecasting app that plots anticipated precipitation.  I'm trying to check the plots against images online from the MetOffice (radar) and AccuWeather (satellite).  They give quite different results.  Just take a look at Scotland on the satellite image (purple) and how close to the Pennines the rain comes.  Why so different?  I thought that it either rained in a particular spot, or it didn't.  The clouds match, so that's good...

 

So which do I go with?  My calculations are somewhere in between, but tending towards the satellite.

 

And if I were dealing in weather derivatives, whose data would determine payouts?

 

Many thanks

 

 

post-20637-0-42481500-1391468122_thumb.p

post-20637-0-78249100-1391468290_thumb.p

Share this post


Link to post
Share on other sites

Hi

 

I'm developing a forecasting app that plots anticipated precipitation.  I'm trying to check the plots against images online from the MetOffice (radar) and AccuWeather (satellite).  They give quite different results.  Just take a look at Scotland on the satellite image (purple) and how close to the Pennines the rain comes.  Why so different?  I thought that it either rained in a particular spot, or it didn't.  The clouds match, so that's good...

 

So which do I go with?  My calculations are somewhere in between, but tending towards the satellite.

 

And if I were dealing in weather derivatives, whose data would determine payouts?

 

Many thanks

 

I can only guess that the satellite based estimates are derived from geostationary satellites, which aren't specifically designed for capturing rainfall data. In a sense, many of the satellites cannot really "see" the rain, but try to derive rainfall rates from things like cloud temperature, optical thickness (from IR and optical imagery) and then integrate that data into some kind of numerical model. This would be of use in remote regions where there aren't enough ground based data.

 

With Doppler radar, it's a more direct measurement of the actual rainfall and intensity, and thus I'd imagine is much more accurate. 

Share this post


Link to post
Share on other sites

I can only guess that the satellite based estimates are derived from geostationary satellites, which aren't specifically designed for capturing rainfall data. In a sense, many of the satellites cannot really "see" the rain, but try to derive rainfall rates from things like cloud temperature, optical thickness (from IR and optical imagery) and then integrate that data into some kind of numerical model. This would be of use in remote regions where there aren't enough ground based data.

 

With Doppler radar, it's a more direct measurement of the actual rainfall and intensity, and thus I'd imagine is much more accurate. 

 

I agree. The doppler radar would definitely be more accurate.

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Sign in to follow this  

×
×
  • Create New...