an ogc standards driven geodata online access for dlrs national remote sensing data library (nrsdl)...

An OGC Standards Driven Geodata Online Access for DLR‘s National Remote Sensing Data Library (NRSDL)

Torsten HeinenGerman Remote Sensing Data Center (DLR/DFD)

CEOS WGISS-24 MeetingsOberpfaffenhofen, 17th October 2007

Institut für Methodik der Fernerkundung bzw. Deutsches Fernerkundungsdatenzentrum

Folie 2Institut für Methodik der Fernerkundung bzw. Deutsches Fernerkundungsdatenzentrum

Folie 2CEOS WGISS 24, Oberpfaffenhofen, 17 Oct 2007 Slide 2

Outline

NRSDL

Overview

DIMS Components

Context of and Motivation for Geospatial Data Access

Users, Projects and Infrastructures

Geospatial Data Access

Candidate Datasets

Access Control

Architectural Overview

Conclusion

Outlook




NRSDL Overview

National Remote Sensing Data Library

Supports numerous missions

National

European

International

Continuous integration of future missions

NRSDL based on DIMS components

E.g. EOWEB® User Interface

SRTM CHAMP TERRAAirborne Imaging ENVISAT

METOP TerraSAR-X TanDEM-X EnMAP

Currently about50 processing systems60.000 product transfers per month100 product types1,000,000 products6.7 Mio. files200 TByte of data




Functionality

Cataloging & ArchivingProcessing & ProductionOrder ManagementDeliveryOnline Access

Classical Asynchronous Catalog Ordering Service

Browse, search and order existing and future products through Web-Gateway and CIPAccess of ordered data through FTP (or CD/DVD)

Data Information and Management System (DIMS)

Direct access to primary data via standardized interfaces not yet implemented

Product Library

Processing SystemIngestion System Post-Processing

EOWEB® User InformationService

PickupPoint

User Systems

PickupPoint

Online/OfflineProd. Gen.& Delivery

OperatingTool

Monitoring& Alarm

DIMS

Data FlowControl Flow

ProductionControl

Ordering Control

UIS Loader/Interface




Context and Motivation for Service-Oriented Data Access Users

Commercial

Scientific

Public

Government

Spatial Data Infrastructure Programs

GDI-DE, INSPIRE, other SDIs

Projects and Initiatives

HMA (ESA)

GMES (EU)

GITEWS (GFZ/DLR)

WISDOM (DLR)

International Charter for Space and Major Disasters (ZKI@DLR)

WDC-RSAT (DLR)

ZKIWDC

Product LibraryArchiveInventory

DIMS

Processing Systems

User Information Services EOWEB®

OGC W*SInterfaces




Standardized Interfaces and Common Software




Candidate Datasets for Online AccessCurrently evaluated datasets (prototype)

SRTM X-SAR (restricted access)

Dted2 DEM & HEM

NOAA AVHRR L3

SST, LST, NDVI

Daily, weekly & monthly

ERS GOME L3+

Atmospheric Trace Gas Concentrations

Historical and Forecasts

Potential further datasets(data policies still to be clarified)

METOP GOME2

Enhanced ERS GOME (more trace gases, higher resolution)

TerraSAR-X / TanDEM-X

Radar Imagery

Dted3/4 DEM @ <12m / <6m

EnMAP

200+ bands hyperspectral @ 30m




Access Control Requirements

Commercial datasets dissemination

Access control, accounting and new price models are mandatory

“Satellitendatensicherheitsgesetz – SatDSiG” ~ Satellite Data Security Law

Restrict access to high-resolution satellite data (such as TerraSAR-X)

Check user, country of origin, AOI, etc. before dissemination Commercial

Online Data Access must therefore be restricted

Service for policy, rule and license management as well as permission check

Up-to-date (and easy updateable) dataset of administrative boundaries

GeoXACML specifies access control with geospatial operators

GeoXACML adopted by OGC [07-026] Currently in RWG

Allows restriction on AOI, user attributes, layer/dataset, resolution, specific features, etc.

Authentication & Authorization through OASIS SAML and (Geo)XACML

Spatial security checks can be backed up by WFS(-T)




Geospatial Data Access Architectural Overview

EOWEB® User Information Service

User Systems

DIMS

Data FlowControl Flow

GeoPEP(OWS-Proxy-Service)

forward or deny OWS request

CSW WMS WCS WFSFTP

Policy &Rule GeoServices

(OWS Service Implementations)

Swaths,Futures,

etc

EO Products &Datasets

Static GeospatialDatasets

Restricted Areas &

AdministrativeBoundaries

GeoPDP(Security-Service)

check request, user & aoi

IngestionService

Ingest, register, secure, publish

GDAS

CSW WMS WFSWCSWFS-T

Product Library

User

User Service

authorize user




ConclusionMission: “To develop new and utilize existing software and services to provide a highly configurable, modular and secure "Corporate Spatial Data Infrastructure" that enables standardized access to and management of geospatial data.”

Besides classical FTP dissemination, direct data access will be established to

Facilitate interoperability

Reach more users, collaborate and contribute datasets on different levels

Provide inherent add-on services like visualisation, filtering, mapping, reprojection, aggregation and subsetting

Challenges and limitations

Access Control

Authentication and Authorization not yet standardized for OWS (but GeoXACML looks promising)

Provide decent performance while restricting access and perform security checks!

Administration of complex rules and policies as is quite complicated

Cope with different „standard flavours“, aka profiles

Only L2+ products

Share security subsystem between GDAS und EOWEB




Outlook

Phase 1 (Q1 2008): Access services for public and free datasets

WFS(-T) for swath coverages, future products and security

WCS for data retrieval and basic post-processing

CSW / WMS for browsing, portrayal and EOWEB integration

Phase 2 (Q2-3 2008): Access control and accounting for OWSs

Portal, PEP and PDP as a baseline for commercial and restricted datasets

Phase 3 (Open): Study and possible adoption of SWE

Sensor Planning Service (SPS) for product tasking & ordering

Sensor Alert Service (SAS) / Web Notification Service (WNS) for notifications on new datasets, content trigger services (fires, floods, etc.)

SensorML for sensor metadata description

Sensor Oberservation Service (SOS) / O&M for raw (L0/1) data




Thank you for your attention!

Maybe [email protected]

Questions?Questions?

an ogc standards driven geodata online access for dlrs national remote sensing data library (nrsdl)...

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