1. Geoportal2 based on relational database
New proposal of the National SDI within the project
GEOPORTAL.GOV.PL
www.geoportal2.pl
Krzysztof Borys, GEOBID, PL
Edward Mecha, GISPOL, PL
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2. Polish geo-portal based on data
made available by powiat (districts, counties)
The main feature of the solution is grounding it on services
provided by individual nodes of the data infrastructure.
The ISO or OGC standards have been used, this applies in
particular to WMS/WFS services.
The idea based on making services available
entails that nodes of lower rank, shall not send data
to upper rank nodes, but rather the upper rank nodes
shall download data from the lower ranks.
A general principle has been assumed that maps will be
downloaded by customers in raster form (WMS format).
Vector data (WFS format) will be available for downloading
only by specialized nodes
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3. Viewing the maps
Map distribution service, or WMS service has been divided
into two categories:
1. the service providing access to public data,
2. the service providing access to non-public (protected)
data.
The users of GEOPORTAL when viewing the maps shall at
the same time make use of central level data (e.g.
administrative borders, ortho-photomap), as well as the
powiat (county) level data (e.g. plot borders, address points).
It is possible, because the WMS service assumes the
possibility of developing transparent rasters, and their mutual
overlaying.
The latter (second) category concerns data with limited
access. Access may be limited both to an area (for example
to one administrative/registration unit) or to specific themes
(for example restricted only to water distribution).
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4. Limited access
Because the problem of authorization and access control
is a complex issue, the concept assumes the existence
of special proxy servers. For central data, this will be the
Central Server Proxy (CSP), while for provincial data as
well as data from powiat (counties), this will be a
Provincial Proxy Server (Polish: Wojewódzki Serwer
Pośredniczący - WSP).
Proxy Server does not generate data. It performs the
role of a filter, which on the basis of the query sent by
the user and the user access level will allow send the
query to proper data server, being a part of:
cadastral node
topographic node
general-geographic node.
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5. Central level
General
Geographic
Node
Orders
Authorization
ODGIK
Documentation
Centre
client Location
Performer
Provincial level
Topographic
Node
Powiat level Cadastral
Node
Commune level
Commune
Node
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7. Cadastral node
A cadastral node will be a set of servers providing specific services.
A cadastral node of the implemented network is composed of two
parts:
internal one, invisible in the Internet network,
external one, which on the one hand has access to the internal
network, on the other hand it has access to public network.
2. The WFS service is a service with protected content,
concerning geometric data and identification in the register of
land and buildings, as well as addresses. The service is
available solely for the Provincial Server Proxy (Wojewódzki
Serwer Pośredniczący - WSP) and is provided in connection with
coded https. In the basic version (the implemented one) the
service is used for searching for plots and adjusted to address
search.
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8. Cadastral node
lin e
ork
tric
etw
me
n
Sym
l
Existing systems
na
Internet network
ter
serving egib
b
In
2M
CADASTRAL NODE OF SDI
ln e
Internal part External part
WINDOWS operating system LINUX operating system
EWMAPA graphic server APACHE server
FIREBIRD database server FIREWALL
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9. Basic services
Services have been divided into basic and additional ones.
Basic services are:
1. WMS service with public content: plots, plot numbers, buildings,
street axes, street names, address points (possibly, additionally the
development plan zones and its markings, a sketch of development plan).
The service making available plots and plot numbers has been assumed
the minimum being subject to implementation. This will be a publicly
available service.
2. The WFS service is a service with protected content, concerning
geometric data and identification in the register of land and buildings, as
well as addresses. The service is available solely for the Provincial Server
Proxy (Wojewódzki Serwer Pośredniczący - WSP) and is provided in
connection with coded https. In the basic version (the implemented one)
the service is used for searching for plots and adjusted to address search.
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10. Additional services
Additional services are available only for the Provincial Server Proxy (WSP)
and are provided through coded https connection.
These are:
1. WMS with non-public content: geodetic matrices, cultivable land,
classification contours, utilities, basic map.
2. WFS with non-public content: geodetic matrices, cultivable land,
classification contours, precinct limits, borders of register units.
3. The OSN service (geodetic matrices) is a special service enabling
downloading of information about geodetic matrices, mainly of class three
and measurement level.
4. The OPE (geodetic surveys) is a special service enabling access to the
database of surveys of the county (district) geodetic and cartographic
documentation centre.
5. The EGB (register of land and buildings) is a special service enabling
access to the data from descriptive part of the register of land and buildings.
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11. Topographic node
& General-geographic node
The presented concept assumes only that a topographic node shall
make its resources available in the WMS/WFS format.
The WMS service, make public data available (accessible from Internet
without limitations)
The WMS/WFS services, make protected data available, accessible only
through the Provincial Server Proxy (Wojewódzki Serwer Pośredniczący
- WSP)
The general-geographic shall be a set (group) of servers providing
specific services based on data included in:
General-geographic Database (BDO),
State Register of Borders and Areas of State Territorial Division Units
(PRG),
State Register of Geographic Names (PRNG),
Bank of Geodetic Matrices (GEOS),
The resources of ortho-photomaps (ORTO) (raster resource).
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12. Security issues
Our concept is based on making use of public Internet network,
standing out due to its fast development, particularly as concerns
the throughput and easy provision of services to many interested
parties. Establishing of a separate network infrastructure does not
only increase the cost, but also requires establishing many access
nodes from public Internet network. It is also of substantial economic
importance.
The decision to use Internet for establishing geodetic infrastructure
calls for creation of highest standard security (at least at the level of
security measures used in bank networks), yet it is much cheaper
than using a separate network.
All the non-public connections will be using the https protocol.
Servers communicating with users in the https protocol will have
certificates issued by registered certification centres (agencies). The
exception will be servers distributing non-public data solely to be
used by WSP and CSP servers( e.g. servers of the county (district)
level). There the exchange of public keys between servers will
suffice.
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13. Location Server and Authorization
In the distributed architecture the most important information is the
information about data location. That information will be stored by the
central server of data location, which on the chart has been marked as
LOCATION. The data location server is in reality the server of basic
meta-data about the location of specific services. The LOCATION sever
will contain the information about location (addresses):
of WSP and CSP servers,
of servers of provincial and central level services.
of services for each register unit,
The task of the authorization server, marked on the chart as
AUTORYZACJA (AUTHORIZATION), is dealing with the logging of
system users, as well as their authorization level. When logging to the
system from the GEOPORTAL server, that server checks whether the
user name and password is correct, on authorization server.
In case of correct logging the AUTORYZACJA (AUTHORIZATION)
server sends a special token to the client. That token will be added to
queries sent to WSP and CSP servers.
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14. Order server
The idea of the order server, is to provide services for users, who want
to use on-line the non-public information through the GEOPORTAL
browser or to receive graphic and descriptive materials in electronic
form or on paper.
The main task of the ORDERS server is to prepare products or to make
products available. The GEOPORTAL server, from which access will be
possible to the ORDERS server, shall provide the possibility of spatial
location
The products have been divided into:
those that do not have the status of documents,
those that have the status of documents.
Electronic data not having the status of documents, shall be
understood as all graphic or descriptive data, which the ORDERS will
be able to download from the remaining nodes of infrastructure powiat
(county,district),
Data having document status will be prepared by entities authorized
to issue such types of documents.
These documents may be prepared in electronic version and provided
with electronic signatures, or may be prepared in paper version and
sent in traditional manner by mail.
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15. ODGIK (Documentation Centre)
Server
ODGIK server is a special server, designed for serving
the contractors performing geodesic and cartographic
works. At present, execution of geodesy-related work is
connected with paying several visits to the centre – first
to notify about works to be performed, then to collect the
prepared materials, finally when submitting survey. If the
supervision performed for the survey revealed errors or
shortcomings, the number of visits may increase.
The task of the ODGIK server is to eliminate the
necessity of visits paid at the documentation centre, or at
least to reduce the number of such visits.
The results of our work can be viewed at the website
www.geoportal2.pl.
Thank you for your attention!
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