Use Case Template
Use Case AQ.FireOccurence.1.a
Spatial and temporal analysis of satellite derived fire occurrence data
Earth Information Exchange
To test web service orchestration for air quality data analysis.
Prepared by: Stefan Falke Washington University and Northrop Grumman IT - TASC
created: February 23, 2007
Modified by <Modifier Name/Affil>, <Date/time>, <Brief Description>
Use Case Identification
Use Case Designation
Use Case Name
Short name: Fire location analysis
Long name: Spatial and temporal analysis of satellite derived fire occurrence data
Use Case Definition
Gathering and processing of fire occurrence data are very labor intensive. A web service based tool for semi-automating this analysis would allow analysis on historical and most recent data wherever and whenever needed (depending only on data availability and quality).
Smoke from biomass burning is an important component of air quality. Quantifying air pollutant emissions from wildfires and prescribed burning is one of the more uncertain inputs to air quality forecasting. Satellite data are being used to help improve the ability to accurately estimate emissions from fires. However, the quality of satellite dervired fire products for air quality applications is not well characterized:
- multiple sensors detect fires - which to use?
- missed detections (cloud cover)
- false detections
- spatial resolution limitations
- temporal resolution limitations
- size and types of fires detected
Two types of analyses conducted on satellite derived fire locations include:
- satellite sensor - satellite sensor comparison
- spatial coincidence of satellite with ground based observations
Through this use case, the air quality analyst works through the following steps:
- Access sources of satellite fire location and fire perimeter data
- Calculate area polygons using buffer analysis on satellite fire location data
- Compare spatial and temporal correspondence of satellite polygons
- Compare overlap of satellite polygons and surface fire perimeters
- Generate spatial maps, temporal plots, and summary statistic tables
Air quality analyst who seeks to understand the quality and behavior of the fire occurrence data in order to use it in modeling smoke emissions or analyzing the source of poor air quality due to smoke.
- 1.Satellite derived fire occurrence data are available
- 2.Web services are available for conducting the spatial/temporal analysis
- 3.Tools for creating analysis service flows are available.
- 1. A spatial-temporal analysis of fire occurrence data visualized in maps, time plots and tables.
- 2. A better understanding of fir occurrence data quality and which satellites are most appropriate for air quality applications.
- 3. Fire occurrence data is input to smoke emissions models and subsequent data analysis tools.
Normal Flow (Process Model)
- 1)The user finds and accesses GOES, MODIS, and surface fire location data through OGC (or otherwise open standard based) interfaces
- 2)The user then finds spatial analysis web services for buffering and overlay analysis
- 3)The data access and spatial analysis services are chained/orchestrated so that fire occurrence data are buffered and then paired in an overlay analysis to determine coincidence between two datasets.
- 4)The user views the results in maps and summary statistic tables
- 1.Operation succeeds and user obtains maps and statistic table views of results.
Special Functional Requirements
- <Cluster>.<SubArea>.<number>.<letter+1> something added or a variant.
E.g. AQ.Smoke.1.b something added or a variant
- <Cluster>.<SubArea>.<number>.<letter+2> something added or a variant
- <Cluster>.<SubArea>.<number>.<letter+3> something added or a variant
Use Case Diagram
State Diagram (optional)
Activity Diagram (optional)
Other Diagrams (optional)
Non-Functional Requirements (optional)
Other Non-functional Requirements
Overall Technical Approach
Soja, et al., 2006 http://www.epa.gov/ttn/chief/conference/ei15/session10/soja.pdf Describes method used for analysis of fire locations/areas for 2002 in Oregon and Alaska.
Soja, et al., 2005: http://www.epa.gov/ttn/chief/conference/ei14/session12/soja.pdf Describes method used for analysis of fire locations/areas for May-August 2002 in Florida.
Hoffman, et al., 2007 Characterizing and understanding the differences between GOES WF_ABBA and MODIS fire products and implications for data assimilation http://ams.confex.com/ams/87ANNUAL/techprogram/paper_117985.htm