|Q1. What is “Super Resolution”
Q2. Will “Super Resolution”
WSR-88D data be available on all scans?
Q3. What are the advantages of
Super Resolution WSR-88D data?
Q4. Why send Super Resolution
data in the Level II data stream?
Q5. Why does the format of the
Level II data need to change in Build 10?
Q6. Why change the Level II data
format in Build 10 if it is possible the NWS may not have the funding needed to
increase the communications links to send Super Resolution data?
Q7. Will there be a capability to
change the transmission of Level II data from recombined (legacy resolution)
data to/from Super Resolution data?
Q8. How much will the Level II
data rate change with Super Resolution data?
Q9. What options are available if
I don’t need Super Resolution data? - Updated
Q10. Will all sites be
able to produce Super Resolution data?
Q11. Can you provide references
concerning the Super Resolution data?
Q12. When will user software
need to be ready to ingest the new Level II format (MSG31)??
Q13. Will our Level II data
decoders need to be able to handle more than one Level II format and data
resolution? - New
Q1. What is “Super Resolution” WSR-88D data?
REPLY: Super Resolution data will provide: increased
reflectivity data resolution by reducing gate spacing from 1 km to 250 m;
increase azimuthal resolution of all three moments of data from 1° to 0.5°; and
the extend the range of Doppler data from 230 km to 300 km.
Q2. Will “Super Resolution” WSR-88D data be
available on all scans?
REPLY: Super Resolution data initially will be produced only
during the “split cuts,” those scans at or below 1.5°. (Note, volume coverage
pattern (VCP) 31 also has a split cut at the 2.5° scan, thus Super Resolution
data will be available at that scan too.)
Q3. What are the advantages of Super Resolution
REPLY: Super Resolution data should lead to increased tornado
warning lead times. Simulations using Super Resolution data show that
mesocyclone and tornado signatures can be detected at greater ranges than with
legacy resolution data. In addition, other smaller scale features should be
detectable in base products sooner or with greater reliability.
Q4. Why send Super Resolution data in the Level II
REPLY: Level II have always been defined as the highest
resolution data the WSR-88D produces. Super Resolution data will be in the
Level II data stream between the Radar Data Acquisition (RDA) and Radar Product
Generator (RPG) and will provide NWS forecasters these data to better support
forecast and warning operations. Being able to include Super Resolution data in
the Level II Data Collection and Distribution Network will enable external
users to experience the advantages of Super Resolution data in real time and
meet NWS requirements for these data in the NCDC archives.
Q5. Why does the format of the Level II data need
to change in Build 10?
REPLY: We need to change the format because the legacy “MSG1”
format does not support Super Resolution unless radials become segmented (2432
block segments) and it does not support Dual Polarization Level II data. Thus,
we need to change the message format by Build 11, when Dual Polarization data
will become available, to “MSG31.” We believe it is better to make these
changes in one build rather than to implement them separately in two
consecutive software builds.
Q6. Why change the Level II data format in Build 10
if it is possible the NWS may not have the funding needed to increase the
communications links to send Super Resolution data?
REPLY: Irrespective of NWS funding of collecting and
distributing Super Resolution data available in real time across the Level II
network, the NEXRAD Program needs to make the change of data format to MSG31 to
support the RDA-RPG communications link for Super Resolution and Dual Pol data.
If the NWS initially does not have the funding to begin collecting and
distributing Super Resolution data with the deployment of Build 10, the NWS
might be able to do so at a later date. To not add this capability in Build 10
would mean we definitely would not be able to collect and distribute Super
Resolution data until at least Build 11.
Q7. Will there be a capability to change the
transmission of Level II data from recombined (legacy resolution) data to/from
Super Resolution data?
REPLY: Yes. This will enable the NEXRAD Program to turn on the
distribution of Super Resolution data if funding for the upgraded
communications becomes available after deployment, if not initially available.
Changes in sites’ transmission of recombined data to/from Super Resolution data
will be announced to users with a proposed implementation schedule for the
affected sites in advance.
Q8. How much will the Level II data rate change
with Super Resolution data?
REPLY: During the course of a complete volume scan the overall
data rate will increase approximately by a factor of 2.3. However, during the
faster VCPs and with a lot of weather echoes, the data rate in the split cuts
can increase by up to a factor of 5. The NWS analysis shows that we will need
to expand the bandwidth available per radar from today’s 128 kbps to 384 kbps
to ensure timely delivery of the data.
Q9. What options are available if I don’t need
Super Resolution data?
REPLY: You can use an algorithm to recombine the Super
Resolution data into a legacy-like resolution. The RPG will use the
Recombination Algorithm to support algorithms and products that require legacy
resolution data and therefore it will be included with the Common Operations
and Development Environment (CODE). Information on where to find the
Recombination Algorithm source code on the CODE web site can be found at:
http://www.weather.gov/code88d/message31.html. The Recombination
Algorithm has been developed and tested by the NSSL to provide legacy
resolution data that provides RPG algorithm performance very similar to the
results if the data were originally collected at the legacy resolution.
Q10. Will all sites be able to produce Super
REPLY: No. The Evansville, IN weather radar (KVWX) will not
have this capability. The Level II data for KVWX will continue to use the MSG1
format and have legacy resolution data.
Q11. Can you provide references concerning the
Super Resolution data?
REPLY: There are two references we suggest which discuss Super
Resolution data and the Recombination Algorithm:
Torres, S. M. and C. D. Curtis, 2007: Initial implementation of super-resolution
data on the NEXRAD network. Preprints, 23rd Conf. on Interactive Information
Processing Systems (IIPS) for Meteorology, Oceanography, and Hydrology, San
Torres, S. M. and C. D. Curtis, 2006: Design considerations for improved tornado
detection using super-resolution data on the NEXRAD network. Preprints, Third
European Conf. on Radar Meteorology and Hydrology (ERAD), Barcelona, Spain,
Q12. When will user software need to be ready to ingest
the new Level II format (MSG31)?
REPLY: The Level II transmitted from sites, except for
Evansville, IN (KVWX) will change to the new format as Build 10 is loaded on
each WSR-88D. Thus, users will need to be ready for the new format when Build
10 is loaded on the first Build 10 Beta Test site, now planned for the week of
6 March 2008. The ROC will publish a Build 10 Beta Test schedule and post the
planned release dates of Build 10 software in advance. Except for Beta Test
sites, sites will have 60 days to install Build 10 after receipt of the
Q13. Will our Level II data decoders need to be able to
handle more than one Level II format and data resolution?
REPLY: Yes. Users’ Level II software will need to be flexible
to ingest both MSG1 and MSG31 format data; and legacy/recombined resolution
data or Super Resolution data as there will be combinations of these data being
transmitted from sites beginning with the Build 10 Beta Test start.