TIGGE data via OPeNDAP Jennifer M. Adams and Brian Doty IGES/COLA.
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Transcript of TIGGE data via OPeNDAP Jennifer M. Adams and Brian Doty IGES/COLA.
![Page 1: TIGGE data via OPeNDAP Jennifer M. Adams and Brian Doty IGES/COLA.](https://reader034.fdocuments.us/reader034/viewer/2022042714/551545dc5503465e608b626b/html5/thumbnails/1.jpg)
TIGGE data via OPeNDAP
Jennifer M. Adams and Brian DotyIGES/COLA
![Page 2: TIGGE data via OPeNDAP Jennifer M. Adams and Brian Doty IGES/COLA.](https://reader034.fdocuments.us/reader034/viewer/2022042714/551545dc5503465e608b626b/html5/thumbnails/2.jpg)
What is GrADS? • GrADS is an interactive tool that integrates
data access, analysis, and visualization• Handles many data formats:
Binary, NetCDF, HDF, GRIB, BUFR • Two data models for gridded and in situ data• Expression handling is flexible, compact, recursive• Programmable interface for scripting• Written in C; code is open source (GPL)• Active users forum with 1800+ subscribers
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GOES VIS Image with Radar, 500mb Heights, and SLP
18z 4 June 2009
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Analysis of Surface METAR Observations with Radar
18z 29 May 2009
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QuikSCAT Winds (HDF), Surface Obs (BUFR), and ETA Model SLP (GRIB)
Another Example of GrADS Graphics Output
00z 6 Dec 2003
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What is the GrADS Data Server?
• GDS is a stable, secure, OPeNDAP data server that provides subsetting and server-side analysis services over the internet
• GDS can serve any GrADS-readable dataset, and unifies all data formats into a NetCDF framework
• Open a data set with http://server/filename instead of /disk/filename
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News from GrADS/GDS Team GrADS has a 5th grid dimension for ensembles set X, Y, Z, T, or E set lon, lat, lev, time, or ens
GrADS has an interface for HDF5 and GRIB2 GDS can serve any GrADS data set GrADS is a client for any OPeNDAP data set GrADS supports GIS-compatible formats GeoTIFF, KML, and ESRI Shapefiles
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GrADS Plot in Google Earth
![Page 9: TIGGE data via OPeNDAP Jennifer M. Adams and Brian Doty IGES/COLA.](https://reader034.fdocuments.us/reader034/viewer/2022042714/551545dc5503465e608b626b/html5/thumbnails/9.jpg)
Palmer Drought Severity IndexJuly 2009
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Ensemble Forecast Time Series (Longitude, Latitude, and Level are fixed)
Forecast Time --->
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Ensemble Forecast Grid (Longitude, Latitude, and Level are fixed)
Forecast Time --->
Ens
embl
e M
embe
r
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Ten Ensemble Forecasts (Longitude, Latitude, and Level are fixed)
Forecast Time --->
Ens
embl
e M
embe
r
![Page 13: TIGGE data via OPeNDAP Jennifer M. Adams and Brian Doty IGES/COLA.](https://reader034.fdocuments.us/reader034/viewer/2022042714/551545dc5503465e608b626b/html5/thumbnails/13.jpg)
Ensemble Forecast Time Series (Longitude, Latitude, and Level are fixed)
Forecast Time --->
![Page 14: TIGGE data via OPeNDAP Jennifer M. Adams and Brian Doty IGES/COLA.](https://reader034.fdocuments.us/reader034/viewer/2022042714/551545dc5503465e608b626b/html5/thumbnails/14.jpg)
Ensemble Mean = tloop(ave(Z,e=1,e=21))Ensemble Min/Max = tloop(min(Z,ens=c00,ens=p20)) +/- StdDev of Ensemble Mean = tloop(sqrt(ave(pow(Z-Zave,2),e=1,e=21)))
Forecast Time --->
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• File aggregation • Format translation• Subset over all dimensions• Server-side analysis• Data become more usable and accessible
Ensemble Data Sets Behind GDS
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+ Perfect testbed for ensemble handling and GRIB2 interface+ Boost to usage of TIGGE data+ Forecasts organized by date and by provider+ Time series of analyses
- Nearly unbearable load on old hardware- 48-hour data embargo- Int’l agreement requires password protection
TIGGE Data Behind GDS at NCAR
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TIGGE Multi-Member Multi-Model Ensemble 500mb Geopotential Height valid August 30, 2008
7-day Lead
3-day Lead
5-day Lead
1-day Lead
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2008 Indian MonsoonComparison of surface observations, TRMM satellite estimates, and TIGGE forecasts
TRMM EstimateStation Observations ECMWF 1.5-day Forecast NCEP 1.5-day Forecast
All-India Precipitation (mm/day)
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TIGGE Forecasts of Hurricane Ikein the Gulf of Mexico, September 2008
00z 8 Sep
12z 8 Sep
00z 9 Sep
12z 9 Sep
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TIGGE Forecasts of Hurricane Ike valid: 12z 9 Sep - 00z 13 Sep 2008
Init:00z
8 Sep
Init:12z
8 Sep
Init:00z
9 Sep
Init:12z
9 Sep