Unify Earth Observation products access with OpenSearch

Unify Earth Observation products access
with OpenSearch
Jérôme Gasperi
CEOS WGISS-35
INPE - Sao Paulo dos Campos, Brazil - May 8th, 2013

What is Opensearch ?
http://www.opensearch.org

OpenSearch is a collection of simple formats for the sharing
of search results.

The OpenSearch description document format can be used
to describe a search engine so that it can be used by
search client applications

Search results can be returned as HTML, Atom, RDF, KML,
json, etc.

OpenSearch description document
http://www.opensearch.org/Specifications/OpenSearch/1.1/Draft_5#OpenSearch_description_document

The OpenSearch description document provides a set of
URL templates which describe the query parameters
accepted by the service and the variety of output formats in
which results can be obtained

<?xml version="1.0" encoding="UTF-8"?>
<OpenSearchDescription xmlns="http://a9.com/-/spec/OpenSearch/1.1/">
<ShortName>Search service</ShortName>
<Description>My dummy search service</Description>
<Tags>example search opensearch</Tags>
<Contact>admin@example.com</Contact>
<Url type="application/atom+xml” template="http://example.com/?q={searchTerms}&pw={startPage?}
&format=atom"/>
<Url type="text/html” template="http://example.com/?q={searchTerms}&pw={startPage?}&format=html"/>
</OpenSearchDescription>

Output format is ATOM
<?xml version="1.0" encoding="UTF-8"?>
<OpenSearchDescription xmlns="http://a9.com/-/spec/OpenSearch/1.1/">
<ShortName>Search service</ShortName>
<Description>My dummy search service</Description>
<Tags>example search opensearch</Tags>
<Contact>admin@example.com</Contact>
<Url type="application/atom+xml” template="http://example.com/?q={searchTerms}&pw={startPage?}
&format=atom"/>
<Url type="text/html” template="http://example.com/?q={searchTerms}&pw={startPage?}&format=html"/>
</OpenSearchDescription>

Output format
is HTML

Query parameters

Two main extensions - Time and Geospatial
time:start

geo:lat, geo:lon, geo:radius

time:end

geo:box
geo:geometry
geo:relation
geo:name

Real life Opensearch benefits
The GEO Geohazards Supersite example

#1

Search query are concises HTTP GET requests

<csw:GetRecords
xmlns:csw="http://www.opengis.net/cat/csw/2.0.2"
xmlns:ogc="http://www.opengis.net/ogc"
xmlns:gml="http://www.opengis.net/gml"
xmlns:rim="urn:oasis:names:tc:ebxml-regrep:xsd:rim:3.0"
outputSchema="urn:oasis:names:tc:ebxml-regrep:xsd:rim:3.0"
version="2.0.2"
service="CSW"
resultType="results"
startPosition="1"
maxRecords="20">
<csw:Query typeNames="rim:RegistryPackage rim:ExtrinsicObject">
<csw:ElementSetName typeNames="rim:RegistryPackage">full</csw:ElementSetName>
<csw:Constraint version="1.1.0">
<ogc:Filter>
<ogc:And>
<ogc:PropertyIsEqualTo>
<ogc:PropertyName>/rim:RegistryPackage/rim:RegistryObjectList[*]/rim:RegistryObject/@id</ogc:PropertyName>
<ogc:PropertyName>/rim:ExtrinsicObject/@id</ogc:PropertyName>
</ogc:PropertyIsEqualTo>
<ogc:PropertyName>/rim:ExtrinsicObject/@objectType</ogc:PropertyName>
<ogc:Literal>urn:ogc:def:objectType:OGC-CSW-ebRIM-EO::EOProduct</ogc:Literal>
<ogc:BBOX>
<ogc:PropertyName>
/rim:ExtrinsicObject/rim:Slot[@name="urn:ogc:def:slot:OGC-CSW-ebRIM-EO::multiExtentOf"]/wrs:ValueList/wrs:AnyValue[1]
</ogc:PropertyName>
<Envelope xmlns="http://www.opengis.net/gml" xmlns:xlink="http://www.w3.org/1999/xlink" srsName="EPSG:4326">
<lowerCorner>-23.8 -47.3</lowerCorner>
<upperCorner>-23.2 -45.5</upperCorner>
</Envelope>
</ogc:BBOX>
</ogc:And>
</ogc:Filter>
</csw:Constraint>
</csw:Query>
</csw:GetRecords>

HMA

This in an HTTP POST request - i.e. no link possible !

<csw:GetRecords
version="2.0.2"
service="CSW"
startPosition="1"
maxRecords="20">
<ogc:Filter>
<ogc:And>
<ogc:BBOX>
<ogc:PropertyName>
</ogc:PropertyName>
</Envelope>
</ogc:BBOX>
</ogc:And>
</ogc:Filter>
</csw:Constraint>
</csw:Query>
</csw:GetRecords>

HMA


<GetRecords
xmlns="http://www.opengis.net/cat/csw/2.0.2"
xmlns:dc="http://purl.org/dc/elements/1.1/"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.opengis.net/cat/csw/2.0.2 http://schemas.opengis.net/csw/2.0.2/CSW-discovery.xsd"
service="CSW"
version="2.0.2"
outputSchema="http://www.opengis.net/cat/csw/2.0.2"
startPosition="1"
maxRecords="20">
<Query typeNames="csw:Record">
<ElementSetName typeNames="csw:Record">full</ElementSetName>
<Constraint version="1.1.0">
<ogc:Filter>
<ogc:And>
<ogc:PropertyName>dc:subject</ogc:PropertyName>
<ogc:Literal>dc8capac</ogc:Literal>
<ogc:BBOX>
<ogc:PropertyName>
ows:BoundingBox
</ogc:PropertyName>
<gml:Envelope srsName="EPSG:4326">
<gml:lowerCorner>-23.8 -47.3</gml:lowerCorner>
<gml:upperCorner>-23.2 -45.5</gml:upperCorner>
</gml:Envelope>
</ogc:BBOX>
</ogc:And>
</ogc:Filter>
</Constraint>
</Query>
</GetRecords>

CWIC

<csw:GetRecords
version="2.0.2"
service="CSW"
startPosition="1"
maxRecords="20">
<ogc:Filter>
<ogc:And>
<ogc:BBOX>
<ogc:PropertyName>
</ogc:PropertyName>
</Envelope>
</ogc:BBOX>
</ogc:And>
</ogc:Filter>
</csw:Constraint>
</csw:Query>
</csw:GetRecords>

HMA


OpenSearch
This is an HTTP GET request - i.e. this is a link !

<GetRecords
xmlns="http://www.opengis.net/cat/csw/2.0.2"
xmlns:dc="http://purl.org/dc/elements/1.1/"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.opengis.net/cat/csw/2.0.2 http://schemas.opengis.net/csw/2.0.2/CSW-discovery.xsd"
service="CSW"
version="2.0.2"
outputSchema="http://www.opengis.net/cat/csw/2.0.2"
startPosition="1"
maxRecords="20">
<Query typeNames="csw:Record">
<ElementSetName typeNames="csw:Record">full</ElementSetName>
<Constraint version="1.1.0">
<ogc:Filter>
<ogc:And>
<ogc:PropertyName>dc:subject</ogc:PropertyName>
<ogc:Literal>dc8capac</ogc:Literal>
<ogc:BBOX>
<ogc:PropertyName>
ows:BoundingBox
</ogc:PropertyName>
<gml:Envelope srsName="EPSG:4326">
<gml:lowerCorner>-23.8 -47.3</gml:lowerCorner>
<gml:upperCorner>-23.2 -45.5</gml:upperCorner>
</gml:Envelope>
</ogc:BBOX>
</ogc:And>
</ogc:Filter>
</Constraint>
</Query>
</GetRecords>

CWIC

http://eo-virtual-archive4.esa.int/search/ASA_IM__0P/atom/?bbox=25,26,41,41&startIndex=1&count=20

#2

HTML results can be indexed by search engine bots

Natural language search

OpenSearch request !

#3

ATOM results are easily handled by advanced clients

OpenSearch request !

Google maps

CNES activities on Opensearch
Land Surfaces Thematic center (PTSC)

"The objective of the Land Surface Thematic
Center is to facilitate the study of issues related to the
impact of anthropogenic pressures on climate and
ecosystems, quantify and model the water cycle and carbon
monitoring developments of societies and their activities,
understand the dynamics of biodiversity."

To achieve this objective, the center will develop and make
available to the scientiﬁc community data, products,
processes and services related to the observation
from space land surfaces.

PTSC by end of 2013

Landsat
South
France Hydroweb
Spirit

h

c
ear
S
pen
O

Land Surfaces
Portal

OpenSearch

POSTEL

~ 120 000 products

CNES

Kalideos Take5

METACATALOG
CS
W

ISO

CSW
CIM

France Very High
resolution cover

IGN

GEOSUD
~1000 products

Unify Earth Observation products access with OpenSearch

Unify Earth Observation products access with OpenSearch

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