u.s. department of the interior u.s. geological survey web services interest group wgiss #28...

U.S. Department of the Interior

U.S. Geological Survey

Web Services Interest Group Web Services Interest Group

WGISS #28September, 2009 Pretoria, South Africa

Lyndon R. OlesonU.S. Geological SurveyEarth Resources Observation and Science (EROS) CenterSioux Falls, SD, USA

2

Web Services Interest GroupWeb Services Interest Group

Agenda

11:00 – 11:15 Web Services IG Status and Overview Lyn Oleson

11:15 – 11:30 Polar Mapping Update and WMS Experience Shinobu Kawahito

11:30 – 12:00 Web Services Technologies for GEO Group

12:00 – 12:15 WGISS Findings – Lessons Learned, Group Best Practices, links to relevant files/web sites

12:15 – 12:20 Future meetings and workshops Group

12:20 - 12:30 Recommendations to WGISS Lyn Oleson

3


Web Services Interest Group Status and Overview Purpose of WSIG: Serve as a forum for exchange of

technical information and lessons-learned experience about Web services and other WWW / Internet related software technologies.

In order to facilitate construction of interoperable service infrastructures, the Interest Group closely observes and interacts with OGC and ISO standardization activities and OGC testbeds (e.g. WCS, CS-W, and WMS) and makes the results available to WGISS and Projects.

Goal: How can we employ SOA and particularly standard Web Services interfaces (e.g. OGC) to enable or enhance information systems interoperability.

Following topics will explore lessons learned to date and ideas for continuing to move forward toward our goal.

4


What is the goal we are pursuing? Allow an EO client to search and obtain data from multiple

agency information systems via a “standard” Web Service interface.

Allow an agency data provider to have many compliant clients from various user communities (e.g. GEO societal benefit communities, various earth science communities, various emergency disaster communities) search and obtain their EO data via a “standard” Web Service interface.

Why employ Web Services?

5


Background: At WGISS 27 in Toulouse

Focused on lessons learned from attempting to employ OGC WCS and CSW specifications.

Many found it difficult to accomplish EO satellite data searches and downloads through the existing OGC specifications.

Concluded that a better strategy might be to identify our own requirements and possibly pursue our own Web Services specifications modeling after the OGC specs in order to achieve our goal if not also contribute to enhancing OGC.

6

Why Employ Web Services?Why Employ Web Services?

Data and Information

Common Service Interface

Client

Server

7




Client

Server





8




Client

Server

9



EO Client

EO Agency Servers




Can we formulate a technical strategy/proposal?



10

Vision for EO Clients/Servers Vision for EO Clients/Servers

Inventory

“Standard” Service

Interfaces

Catalog

SearchesTypical EO

“Client”

An Agency Set of EO Servers

CWS

Browse Images

View

Browse

WMS

Online Data

Direct Data

Download

WCS

?

Registration, Shopping Basket, On-demand

Product Orders, other?

Registration, Shopping Basket Services, etc.

ISO 19115 based WS interface

11

Vision for an EO ClientVision for an EO Client

CWS WMS WCS

Earth Observations Client

NASA ECHO Servers

Other Agency Servers

NOAA CLASS Servers

ISO 19115 based WS interface

12


Actions from WGISS #27 (27-1): Web Services Interest Group will prepare a draft Web

services requirements document for wider WGISS review and comment. The requirements document will have two parts:

(1) the definition of a set of core satellite data query and search refinement parameters that would be needed to support effective cross-satellite, catalogue searching and product selection; and

(2) a set of associated scenarios that illustrate how these search parameters might be employed in a standard Web services interface between a client portal and the satellite data servers they are querying and requesting data from.

Draft and present at WGISS-28, and then decide how best to share with others and describe deliverable to CEOS Plenary and GEOSS.

13


Action part (2): Scenarios to illustrate EO search and order requirements

Employing a typical Landsat search and order process on USGS Earth Explorer or GloVis portals

Look at other EO information systems via LSI portal

14


Recommendations to WGISS? Base search interface requirements on ISO 19115 Create generic scenario that includes the additional

requirements for browsing, ordering, and user registration/validation

Generate technical proposal that Prototype as part of WADC “clearinghouse” effort?

15


Scenarios bring additional requirements beyond catalog searching

Browse images (could employ WMS) User registration User profiles and validation where restrictions are involved Product ordering options

Product parameters (e.g. map projections, resolution) Delivery options (e.g. ftp, shipped media) May involve purchase process

Product direct download for online products (WCS?)

16


USGS/EROS Landsat Search/Order Scenario Possibly initiated by a link to Earth Explorer or GloVis from

IDN or LSI Portal Identify a data set of interest – Landsat ETM+ Specify an area of interest

Interactive map Uploading an area of interest file (Shape File, Simple Features

File, GML, etc.) Keying in latitude/longitude rectangle or point Specifying a Landsat Path/Row

Specify one or more date and time periods of interest Possibly specify cloud cover % Initiate inventory search

17


USGS/EROS Landsat Search/Order Scenario View results and possibly refine search parameters and

submit new search View footprints of selected images on a map Request to view one or more reduced resolution browse

images to aid in the selection Select one or more specific scenes for download Before download, register as new user or provide previous

login (users are not validated) Initiate http download to user’s local storage Other functions available:

Request an “on-demand” product to be made and staged Set up a “standing request” Make arrangements for bulk data delivery

18


Explore LSI links for insight into requirements http://wgiss.ceos.org/lsip/

19


Conclusions? OGC too sparse to effectively support EO catalog searches OGC does not include temporal parameters CIP still excellent and applicable ISO 19115 is more current “standard” for CIP Base our parameter requirements on ISO 19115

20


Presentation by Shinobu Kawahito, JAXA/RESTEC: Polar Mapping Update and WMS Experience

u.s. department of the interior u.s. geological survey web services interest group wgiss #28...

Documents