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-to-use, 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 Inventory support
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. DIAL Server Available Protocols View Search OR SEARCH HTTP - in place
V0 - in place
CIP - planned
DATA
HTTP - in place
Data
Granules
View
Web Browser
HTTP dialog
HTTP
internal
CGI
dialogs
Earth Data
Gateway
Catalog
Database
V0 dialog V0
JDBC
CIP Retrieval
Manager
CIP dialog
CIP
Search OR
Catalog
Flat File

9. DIAL Sites in a CIP Based Federation
Peer-to-Peer RM Dialog
Subordinate RM Dialog
Client Dialog
LEGEND
Retrieval
Manager
(global node)
Retrieval
Manager
(global node)
Retrieval
Manager
(global node)
Retrieval
Manager
(global node)
CIP
Catalog
Retrieval
Manager
CIP
Catalog
CIP
Catalog
CIP
Catalog
CIP
Catalog
CIP
Catalog