flowworks.com. what is an isohyetal? an isohyetal (or isohyet) is a line joining points of equal...
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Using Isohyetal Mapping to Better Understand Rainfall Data
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What is an Isohyetal?An isohyetal (or isohyet) is a line joining points of equal precipitation on a map.
Texas and Western Louisiana, July 24-27, 1979, http://www.srh.noaa.gov/hgx/hurricanes/gifs/claud.jpg
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Isohyetal maps, also known as contour maps, are a method of showing values spread over a geographic area.
Another example would be how contour lines are used to show elevation changes in topographical maps.
For our app, we are using contour lines to illustrate rainfall over a city or region. The gradient from red to blue shows areas of greater to lesser rainfall, based on a user-defined period.
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The Technology Behind the Tool
The app uses custom built Esri ArcGIS Server Geoprocessing Tools to create both the rainfall surface and rainfall contours.
This allows non-GIS users to develop and create custom maps for reporting, as well as aiding in more timely decision making.
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Examples
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The Engineering Side (Use Cases)
• Identify faulty rain gauges
• Spatial mapping across different regions/catchments
• Field staff mobilization
• Verify issues caused by storm event (backups, etc.)
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Public Data SourceExample
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Information
Mike ScottSales Director
1-888-400-3288