Multiple Radar Data Merging in Hydro-NEXRAD
Publication: World Environmental and Water Resources Congress 2008: Ahupua'A
Abstract
The Hydro-NEXRAD merging algorithms include two options: (1) data-based merging; and (2) product-based merging. Data-based merging algorithm takes volume scan reflectivity data from all radars involved through preprocessing algorithm that performs volume data quality control, interpolates data to synchronize temporal scale between individual radars, and finally combines data onto a common geographic grid. Reflectivity values for a given location are assigned by a weighting function with respect to the distance from the radar. This single reflectivity field is then converted to rainfall amounts using a user-requested standard approach. In product-based merging algorithm reflectivity data from multiple radars are all converted to rainfall using the same, user-specified algorithm. These products are then combined into the final one using a weighting function that expresses the uncertainty of estimated rainfall amounts.
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Copyright
© 2008 American Society of Civil Engineers.
History
Published online: Apr 26, 2012
ASCE Technical Topics:
- Algorithms
- Business management
- Climates
- Computer vision and image processing
- Continuum mechanics
- Dynamics (solid mechanics)
- Engineering fundamentals
- Engineering mechanics
- Environmental engineering
- Equipment and machinery
- Grid systems
- Hydrologic data
- Hydrologic engineering
- Hydrology
- Management methods
- Mathematics
- Meteorology
- Methodology (by type)
- Motion (dynamics)
- Practice and Profession
- Precipitation
- Quality control
- Radar
- Rainfall
- Solid mechanics
- Systems engineering
- Systems management
- Uncertainty principles
- Water and water resources
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