Help on GSD's Precipitation Display

Instructions

The Select Data button will bring up a window with a list of available data. Select one data set and click Load or Apply to load the data. (Apply will leave the list of available data open, Load will close that window.) You can select a new data set at any time; it will overwrite the previous data. (At present, you can only select one 24 hr period at a time.)

Symbols on the map indicate what kind of reports we received from each station.

Move the mouse over the map to see the geographic coordinates, the station name and description, and daily total precipitation under the cursor, and for stations in the hourly data stream, the number of hours that the station reported.

Drag (move the mouse while holding down button 1) to choose an area in which to zoom. (The zoom will occur as soon as the mouse button is released.) You can move the zoomed region by using the overview window, and you can un-zoom by clicking the Unzoom button.

Click with mouse button 1 on any HADS station to see a time-series of rain (inches) vs. time (hrs) in a separate window. The data are shown in red, with a gray 'shadow' at 10 times the precipitation amount also shown to more clearly reveal small values. Move the mouse across the time series to reveal individual values. Drag the mouse across the time series to generate precipitation sub-totals, which will appear in a separate window. (Close individual time-series windows in the normal way, or use the applet's Close TS button to close all of them.)

Use the Find Stn. button to identify a particular station. After entering the station's ID, a large red cross will appear centered on the station. If you don't see the red cross, the station is off the map. Use the World button to see all the stations. If you still don't see a cross, check the Progress window below the map, which will have an entry that the station was not found.

Choose to display counties and/or rivers by clicking the Overlays button. It may take a few minutes for these to load. (Image rendering is faster when fewer lines are displayed, so you may wish to only display these after you have zoomed in.)

Use the Color slider limit the range of precipitation values shown by dragging the orange balls. A single click on the color slider will restore the balls to the ends of the bar and restore an unlimited precip range.

Use the Min spacing slider to limit the minimum spacing between stations. This is particularly useful when showing values along with each station. When stations are closer than the min. spacing limit, the display will preferentially show the station reporting higher precipation amounts.

Use the Show... button to show the precipitation value alongside each station, and/or to show only stations that reported at all, hourly, or daily. Selecting both Hourly only and Daily only will show only those stations that both the hourly and daily data streams.

More information
Prepared by Bill Moninger, Bill.Moninger@noaa.gov
Last modified: Thu Feb 12 21:30:34 GMT 2009