Difference between revisions of "Talk:Goddard DAAC Air Pollution Event Search Tool"

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Querying by location, time and/or pollutant concentration is useful for researchers and others familiar with air quality data. But for people not familiar with what PM2.5 is or the significance of 65 ug/m3, searching by event type is useful. The challenge, as I'm sure you've encountered with the weather events, is how to characterize events for querying observation data. How does your search tool work? Can you provide an example of how a user might search for weather event data? [[User:Sfalke|Sfalke]]
 
Querying by location, time and/or pollutant concentration is useful for researchers and others familiar with air quality data. But for people not familiar with what PM2.5 is or the significance of 65 ug/m3, searching by event type is useful. The challenge, as I'm sure you've encountered with the weather events, is how to characterize events for querying observation data. How does your search tool work? Can you provide an example of how a user might search for weather event data? [[User:Sfalke|Sfalke]]
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 +
'''Example'''
  
 
The Mirador test page, which currently provides an interface for event searching is:
 
The Mirador test page, which currently provides an interface for event searching is:
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The interface provides four prompts: Keywords, Location, Events, Time Span.
 
The interface provides four prompts: Keywords, Location, Events, Time Span.
  
To locate the Feb 19, 2004 dust event:
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'''To locate the Feb 19, 2004 dust event:'''
  
Enter Keywords: "MYD021KM"
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*Enter Keywords: "MYD021KM"
Leave Location blank.
+
*Leave Location blank.
Enter "Pm10%HIGH WINDS"  (Exactly as entered to the left, we are not case insensitive yet.)
+
*Enter "Pm10%HIGH WINDS"  (Enter exactly as written to the left, we are not case insensitive yet:))
Leave Time Span blank.
+
*Leave Time Span blank.
  
A new page will list the two collections. Click on the  
+
A new page will list one collection. Click on the  
 
"List selected files by time" button.
 
"List selected files by time" button.
  
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change this to a case insensitive full text search, soon!)
 
change this to a case insensitive full text search, soon!)
  
Below are the events that most frequently intersect MODIS and AIRS data and are
+
'''Below are the events that most frequently intersect MODIS and AIRS data and are
current available in Mirador:
+
current available in Mirador:'''
 
 
eventname                                                         Total
 
 
 
Air Pollution Particulate Matter (Pm2.5 15.5 - 40.4 ug/m3) Moderate 16183
 
 
 
Air Pollution Ozone (O3 0.065 - 0.084 ppm) Moderate                 5574
 
 
 
Air Pollution Particulate Matter (Pm10 55 - 154 ug/m3) Moderate         5472
 
 
 
Air Pollution Particulate Matter (Pm2.5 40.5 - 65.4 ug/m3) Unhealthy for sensitive group 4526
 
Air Pollution Sulfur Dioxide (SO2 0.035 - 0.144 ppm) Moderate         3636
 
 
 
Air Pollution Carbon Monoxide (CO 4.5 - 9.4 ppm) Moderate         2095
 
 
 
Air Pollution Ozone (O3 0.085 - 0.104 ppm) Unhealthy for sensitive groups 1618
 
 
 
Air Pollution Particulate Matter (Pm2.5 65.5 - 150.4 ug/m3) Unhealthy         1089
 
 
 
Air Pollution Particulate Matter (Pm10 155 - 254 ug/m3) Unhealthy for sensitive groups 678
 
 
 
Air Pollution Ozone (O3 0.105 - 0.124 ppm) Unhealthy                   406
 
 
 
HAIL (0.75 inches)                                                   309
 
 
 
TSTM WIND (50 knots)                                                   222
 
 
 
Air Pollution Sulfur Dioxide (SO2 >= 0.805) Hazardous                   218
 
 
 
HAIL (0.88 inches)                                                   191
 
 
 
HAIL (1 inches)                                                           156
 
 
 
Air Pollution Particulate Matter (Pm2.5 15.5 - 40.4 ug/m3) Moderate SAHARA DUST 155
 
 
 
Air Pollution Particulate Matter (Pm10 255 - 354 ug/m3 Unhealthy   147
 
 
 
TSTM WIND (60 knots)                                                   123
 
 
 
TSTM WIND (52 knots)                                                   120
 
 
 
Air Pollution Particulate Matter (Pm2.5 15.5 - 40.4 ug/m3) Moderate PRESCRIBED BURNING 107
 
 
 
Air Pollution Sulfur Dioxide (SO2 0.145 - 0.224 ppm) Unhealthy for sensitive groups 94
 
 
 
Air Pollution Sulfur Dioxide (SO2 0.305 - 0.604 ppm) Very Unhealthy   89
 
  
TORNADO (0 f scale)                                                   81
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''eventname'' 
 +
*Air Pollution Particulate Matter (Pm2.5 15.5 - 40.4 ug/m3) Moderate
 +
*Air Pollution Ozone (O3 0.065 - 0.084 ppm) Moderate
 +
*Air Pollution Particulate Matter (Pm10 55 - 154 ug/m3) Moderate
 +
*Air Pollution Particulate Matter (Pm2.5 40.5 - 65.4 ug/m3) Unhealthy for sensitive group
 +
*Air Pollution Sulfur Dioxide (SO2 0.035 - 0.144 ppm) Moderate
 +
*Air Pollution Carbon Monoxide (CO 4.5 - 9.4 ppm) Moderate
 +
*Air Pollution Ozone (O3 0.085 - 0.104 ppm) Unhealthy for sensitive groups
 +
*Air Pollution Particulate Matter (Pm2.5 65.5 - 150.4 ug/m3) Unhealthy
 +
*HAIL (0.75 inches)
 +
*TSTM WIND (50 knots)
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*Air Pollution Sulfur Dioxide (SO2 >= 0.805) Hazardous
 +
*Air Pollution Particulate Matter (Pm2.5 15.5 - 40.4 ug/m3) Moderate SAHARA DUST
 +
*Air Pollution Particulate Matter (Pm2.5 15.5 - 40.4 ug/m3) Moderate PRESCRIBED BURNING
 +
*Air Pollution Sulfur Dioxide (SO2 0.145 - 0.224 ppm) Unhealthy for sensitive groups
 +
*TORNADO (0 f scale)
 +
*KARL Extratropical Storm 11                                           79
  
KARL Extratropical Storm 11                                           79
 
  
Full list of events is in [[file:events.xls]].
+
Full list of events is in [[media:events.xls]].
  
A little on the event definitions:
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'''Event definitions:'''
  
 
EPA AQS data was used to define "Air Pollution" events. I only defined events
 
EPA AQS data was used to define "Air Pollution" events. I only defined events
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PM10 Total 0-10um (81102).
 
PM10 Total 0-10um (81102).
  
In instances where a qualifier (e.g. PRESCRIBED BURNING, SAHARA DUST) was present
+
In instances where a qualifier (e.g. PRESCRIBED BURNING, SAHARA DUST) was present,
 
it was included in the event name.
 
it was included in the event name.
  

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Event Search Tool

Your Mirador search interface using an event gazetteer is an interesting and potentially useful way to search for air quality data. The key air quality events include smoke from fires, dust plumes, and urban haze events. A good summary of air quality events is provided on an aerosol events site created by Rudy Husar, also with CAPITA at Washington University:

The NASA Earth Observatory has also cataloged images of dust, fire and smoke.

Querying by location, time and/or pollutant concentration is useful for researchers and others familiar with air quality data. But for people not familiar with what PM2.5 is or the significance of 65 ug/m3, searching by event type is useful. The challenge, as I'm sure you've encountered with the weather events, is how to characterize events for querying observation data. How does your search tool work? Can you provide an example of how a user might search for weather event data? Sfalke

Example

The Mirador test page, which currently provides an interface for event searching is: http://g0dup05u-ts2.ecs.nasa.gov/mirador/.

The interface provides four prompts: Keywords, Location, Events, Time Span.

To locate the Feb 19, 2004 dust event:

  • Enter Keywords: "MYD021KM"
  • Leave Location blank.
  • Enter "Pm10%HIGH WINDS" (Enter exactly as written to the left, we are not case insensitive yet:))
  • Leave Time Span blank.

A new page will list one collection. Click on the "List selected files by time" button.

Click on the image for: 2004-02-19 19:50:00 MYD021KM.A2004050.1945.004.2004052034748.hdf

The event search is currently a substring case-sensitive search. (We will change this to a case insensitive full text search, soon!)

Below are the events that most frequently intersect MODIS and AIRS data and are current available in Mirador:

eventname

  • Air Pollution Particulate Matter (Pm2.5 15.5 - 40.4 ug/m3) Moderate
  • Air Pollution Ozone (O3 0.065 - 0.084 ppm) Moderate
  • Air Pollution Particulate Matter (Pm10 55 - 154 ug/m3) Moderate
  • Air Pollution Particulate Matter (Pm2.5 40.5 - 65.4 ug/m3) Unhealthy for sensitive group
  • Air Pollution Sulfur Dioxide (SO2 0.035 - 0.144 ppm) Moderate
  • Air Pollution Carbon Monoxide (CO 4.5 - 9.4 ppm) Moderate
  • Air Pollution Ozone (O3 0.085 - 0.104 ppm) Unhealthy for sensitive groups
  • Air Pollution Particulate Matter (Pm2.5 65.5 - 150.4 ug/m3) Unhealthy
  • HAIL (0.75 inches)
  • TSTM WIND (50 knots)
  • Air Pollution Sulfur Dioxide (SO2 >= 0.805) Hazardous
  • Air Pollution Particulate Matter (Pm2.5 15.5 - 40.4 ug/m3) Moderate SAHARA DUST
  • Air Pollution Particulate Matter (Pm2.5 15.5 - 40.4 ug/m3) Moderate PRESCRIBED BURNING
  • Air Pollution Sulfur Dioxide (SO2 0.145 - 0.224 ppm) Unhealthy for sensitive groups
  • TORNADO (0 f scale)
  • KARL Extratropical Storm 11 79


Full list of events is in media:events.xls.

Event definitions:

EPA AQS data was used to define "Air Pollution" events. I only defined events for parameters listed in the Breakpoints for the AQI table listed in Federal Register August 4, 1999. (CO, O3, NO2, SO2, PM10, Pm2.5)

The FR's table doesn't list anything between Very unhealthy and Hazardous. In cases where values fell into these ranges I defined the event as Very unhealthy. (e.g. S02 0.605-0.804 ppm)

For PM measurements, I used only PM2.5 - Local Conditions (88101) and PM10 Total 0-10um (81102).

In instances where a qualifier (e.g. PRESCRIBED BURNING, SAHARA DUST) was present, it was included in the event name.

For "Air Pollution" events, the spatial boundary of the event is the site's lat/lon, and the temporal boundary of the event is the beginning / ending time range where the measurements was within the events range.

During a search the event's lat/lon and beginning/ending time ranges are used to intersect a data file's lat/lon and time ranges.

All AQI components have been loaded into Mirador for the year 2004. For 2005, only Carbon Monoxide, Nitrogen Dioxide, and Ozone have been loaded.

Additionally, NOAA's storm event database has been loaded events since 1997, where the event has valid lat/lon coordinates. Only about 2/3 or the storm entries have valid coordinates.

Lastly, NOAA's Atlantic Hurricane database is also included and contains tropical storms and hurricanes back to 1970.

Peter MacHarrie pmacharr