Source:

1. DIAL Update
Doug Ilg
Raytheon ITSS
Doug.Ilg@gsfc.nasa.gov
HDF-EOS Workshop III
September 14, 1999

2. Background
• NRC report recommended broader
distribution of EOSDIS functionality
• Small scale data producers wanted easy-touse, yet powerful data distribution method
• Many data producers have very tiny
budgets

3. Basic Design Goals
• A turn-key data distribution system that:
– Promotes EOSDIS standards
– Administrator
• Low (no) cost
• No licensing difficulties
• Easy maintenance
– User
•
•
•
•
Easy to use
Catalog search
Dynamic browsing
Easy data retrieval

4. Building Blocks
• Public domain, off-the-shelf (PDOTS)
components
– Apache WWW server
– NCSA Scientific Data Browser
• Custom CGI
–
–
–
–
Search engine with HTML and Java interfaces
Basic visualization for browse purposes
Home grown “database”
JDBC interface
• Free Web browsers

5. “Classic” Features
• Hybrid interface including HTML, Java, JavaScript
• Simple, configurable metadata search
– Spatial/temporal/other
• Basic visualization of HDF and HDF-EOS files
– HTML for structural information
– GIF for browse imagery
• Immediate data download
– HDF/ASCII/binary
• Inventory support
– Custom “flat file”
– JDBC

6. “New” Features
•
•
•
•
•
Animation
Coastline and political boundary overlays
Color compositing for multi-band images
Cross-granule subsetting and subsampling
Support for Version 0 protocol

7. V0 Interoperability Results
• Very successful demonstration at GOIN99
• Used as basis for ESIP Federation “cluster”
• Accepted as component of “System Wide
Interface Layer” for Federation
• Remaining problems:
– V0 is only supported on Sun and SGI
– Seen as old technology
– CIP is still in flux

8. SEARCH
HTTP
V0
CIP
- in place
- in place
- planned
DATA
HTTP - in place
HTTP dialog
Earth Data
Gateway
Web Browser
V0 dialog
CIP Retrieval
Manager
CIP dialog
Data
Granules
HTTP
V0
CIP
internal
CGI
dialogs
JDBC
Catalog
Database
Catalog
Flat File

9. LEGEND
Peer-to-Peer RM Dialog
Subordinate RM Dialog
Client Dialog
Retrieval
Manager
(global node)
Retrieval
Manager
(global node)
CIP
Catalog
CIP
Catalog
CIP
Catalog
Retrieval
Manager
(global node)
Retrieval
Manager
(global node)
CIP
Catalog
Retrieval
Manager
CIP
Catalog
CIP
Catalog

10. LEGEND
Peer-to-Peer RM Dialog
Subordinate RM Dialog
Client Dialog
Retrieval
Manager
(global node)
Retrieval
Manager
(global node)
CIP
Catalog
CIP
Catalog
CIP
Catalog
Retrieval
Manager
(global node)
Retrieval
Manager
(global node)
CIP
Catalog
Retrieval
Manager
CIP
Catalog
CIP
Catalog