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Remote Sensing Information Gateway

CALIPSO data has been unavailable due to technical problems (cooling system, firewall rehosting) at the NASA Langley computer center. When the data is back on-line, it will be available in RSIG.

The Remote Sensing Information Gateway (RSIG) allows for quick and easy access to subsets of multi-terabyte environmental datasets, including satellite, modeled, and in-situ sensor data. The old process of downloading and parsing data (taking days, weeks, or months) is reduced to minutes with RSIG.

The RSIG project has developed three free, publicly available software components:
  1. RSIG3D -- under active development -- is a standalone application for Windows and Mac OS X systems with a richly immersive and interactive visualization capability. It offers 2D and 3D visualization and saving of data from rsigserver. RSIG3D receives data (often 3D, up to one week) rather than images of the data, therefore the user's computer requires about 8GB of memory (enough for up to 5 global datasets).
  2. rsigserver is a web service that conforms to the Open Geospatial Consortium (OGC)-Web Coverage Services (WCS)/Web Mapping Services (WMS) standards. rsigserver streams subsets of atmospheric data to applications. Applications currently using rsigserver include: RSIG2D, RSIG3D, Estuary Data Mapper, Real-TIme GeOspatial Data Viewer (RETIGO), custom scripts, custom external applications, etc. Users can also construct web server scripts to access RSIG data via rsigserver.
  3. RSIG2D -- now a legacy product -- is a Java applet/application for two-dimensional visualization and saving of data from rsigserver. It is recommended to download the standalone application, although the applet is still available. The user-selected subsets of 2D data are streamed from external sources (e.g., NASA) to a server at EPA and rendered on-the-fly into hourly images that are then streamed to the user's computer running RSIG2D (either inside or outside a web browser). Up to one month of data (= 744 images) can be requested. The application requires minimal memory to run.

RSIG2D and RSIG3D interfaces


About RSIG

With RSIG, the user can tap into a wide range of key environmental models and data, such as NASA's Moderate Resolution Imaging Spectroradiometer (MODIS), the Environmental Protection Agency's (EPA) Community Multi-scale Air Quality (CMAQ) model output, National Environmental Satellite, Data, and Information Service (NESDIS) biomass burning data, and ground station measurements from AIRNow and EPA's Air Quality System (AQS). RSIG also enables users to integrate their selected datasets into a unified visualization.

Image displaying GOES-GASP Geostationary US-coverage satelliteGOES-GASP Geostationary US-coverage satellite 4km Aerosol Optical Depth data.

RSIG renders each dataset and overlays them on a map of the selected region, automatically aligning information from various spatial and temporal scales into a unified visualization.
 

Currently, RSIG focuses on atmospheric data, but it can be extended to support other types of geospatial data. A list of available datasets accessible via RSIG is available on this site.

The benefit to users and consumers of environmental data is fast acquisition of only the data they want to see and in a standard format they can save to their desktop PC.

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RSIG's Key Features

  • One access point to many data sources. The RSIG provides a single Web site that serves as a selective access point to many kinds of data.
  • Streams only the needed data. The RSIG accesses large numbers of files from diverse sources and streams the user-selected subset of data back to the user's desktop. Streaming works in the same way as streaming audio works on the Web: the data goes directly to the client computer's memory and is discarded unless the user saves it to a file.
  • Aggregates separate data files into a single stream. RSIG aggregates the multiple files of a given data type into a single stream, reducing the download burden and simplifying data analysis.
  • Built-in visualization. RSIG can immediately integrate multiple selected datasets into a single MPEG animation. For example, EPA AIRNow data can be layered over NASA's MODIS satellite data, or a user can compare CMAQ predicted outputs and actual ground sensor data. The user can also save the animation or individual images to their computer.
  • Saves data to standard formats. RSIG integrates incoming proprietary dataset formats into standard formats the user can save on their computer. A user can save the data or visualization--or both--to their local computer in such standard formats as portable binary, ASCII, NetCDF IOAPI and COARDS, GeoTIFF, MPEG and KMZ. The user can then export the selected datasets from RSIG into other applications--such as GIS tools--for further analysis
  • Fast. RSIG accomplishes all of this far faster than a lone user could with currently available means. For example, RSIG can capture a week of MODIS AOD data in a few minutes, compared to two months using conventional web-form ordering/ftp approaches.

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RSIG: Data and Visualizations

NEUBrew (NOAA-EPA Brewer Spectrophotometer UV and Ozone Network) ozone profile data.

Image displaying the NEUBrew ozone profile data.
(Click image for larger view.)

CALIPSO Level-2 5km Aerosol and Cloud Profiles.

Image displaying CALIPSO Level-2 5km.
(Click image for larger view.)

With additional data-filtering options.

Image displaying GASP image options.
(Click image for larger view.)

And MODIS Level-2 10km "Deep Blue" Aerosol Optical Depth (over sand / high-reflectance).

Image showing MODIS Level-2 10km.
(Click image for larger view.)

MOZAIC European-based global commercial aircraft flight measured ozone, CO, NO data MOZAIC Exit (currently under restricted access pending an agreement between EPA and European scientists).

Image of MOZAIC European-based global commercial aircraft flight measured ozone.
(Click image for larger view.)

Image of CALIPSO data is spatially aggregated.
(Click image for larger view.)

GOES-GASP Geostationary US-coverage satellite 4km Aerosol Optical Depth data.

Image displaying Geostationary US-coverage satellite.
(Click image for larger view.)

Comparison (difference, absolute difference, percent difference, ratio, after regridding) of Ozone, AOD, PM25 from MODIS, FAQSD, GASP, MOZAIC, Airnow and AQS to CMAQ.

Image displaying Geostationary US-coverage satellite.
(Click image for larger view.)

Intersection of CALIPSO and MOZAIC 4D path in CMAQ grid. I.e., extract CMAQ data for each lon-lat-elevation-time of the other data.

Image displaying Intersection of CALIPSO and MOZAIC 4D path in CMAQ grid.
(Click image for larger view.)

AQS ground station measured data: SO2, Temperature and Relative Humidity.

Image displaying AQS ground station measured data.
(Click image for larger view.)

Access to April 2010 collection 5.1 MODIS L2 data. (Icelandic volcano plume shown.)

Image of Icelandic volcano plume.
(Click image for larger view.)

RSIG's Architecture

This poster describes in detail RSIG's flexible and extensible architecture. The architecture enables RSIG to serve many types of data with an emphasis on convenience, high-performance, data integrity, and security. Depending on the speed of your connection, the poster may take a few seconds to load for viewing.

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