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Precip Team: August 12

Goal for day 1: Complete satellite analysis section of the chapter

Location: H120

Session 1: 10:00 - 12:00

  • Go over data sheets; finalize data sheets
  • Outline procedure for accessing data using NEO and/or Giovanni

12:00 – 1:00 Lunch

Session 2: 1:00 – 3:00

  • Decide on science question for the satellite analysis
  • Identify background information and, if applicable, related questions that could be addressed with data

Example of a question that can be answered using these datasets:

- How extreme is the precipitation compared to previous years? Why do my measurements differ from those in my local area?

- From here, the citizen scientist can compare a grid value of satellite data to CoCoRAHS stations within that pixel from year to year

Datasets to use:

TRMM/combined precipitation

CoCoRAHS monitoring station

Citizen Scientists

Relevant background information:

TRMM data visualization
Drought impact monitor
TRMM website
Earth Observatory

Other Sources of precipitation data:
  • Cooperate Observers
  • Water monitoring from NWS


  • Comparing precipitation to vegetation growth
  • Comparing precipitation to streamflow data
  • Comparing precipitation and firehazard
  • Seasonality of precipitation measurements
  • Soil Moisture and its relationship to precipitation
  • What does a 100 year flood mean?

3:00 – 3:15 Break (break when needed)

Session 3: 3:15 – 5:00

  • Outline a sample analysis to show how someone would analyze a single image; explain why each step is important
  • Test procedure
A. Question: Why is my measurement different from my neighbor's measurement?
Why do neither measurements match what the satellite tells me?
(How does the satellite data compare to my gauge data?)

Grab and graph data side by side
1. Choose the TOVAS data in GIOVANNI
2. Find the corresponding ground station data in CoCoRAHS (IN-AD-1)
3. Compare the CoCoRAHS data to the TOVAS data

B. Question, how many gauge stations does it take to determine whether the satellite value is accurate (stable average)?
This is a statistical question.
Comparing a single grid square (sat data) with all available gauge data

Use an online tool or other tool to redraw the map with the data. Such as Google earth

Suggest: Build a custom tool that will accomplish showing us a data set, when hovering over a map.
1. Go to
similar to where you can download a rainguage data file and compare to sat data

2.  Google earth file of trmm data is available. here

succeeded (sort of)!

Note: easiest data to use is that which is distributed by NOAA
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