Diplom Ingenieur Für Kulturtechnik Und Wasserwirtschaft

HUGO FUCHS

Diplom Ingenieur für Kulturtechnik und Wasserwirtschaft

Digitale Dokumentation Kommunaler Infrastruktur

Görzer Allee 37 | 9020 Klagenfurt | tel: +43 (0)664 3556843 | e-Mail: | homepage:

special report

GEODATA

for SETEC Engineering

in program 1:

Water and Sewerage Programme in
Medium-Sized Municipalities in Serbia
by

Hugo Fuchs

GIS and mapping expert

To avoid further misunderstandings and to push our project forward, I will give a short and compact overview about the topic GeoData.
Due to the problems we had to get better data in the last year, I decided to concentrate on the most actual and most useful data set for further GIS usage: This areorthophotos!
(

1GeoData: Why do we need them?

The main question in all PUCs always is: WHERE! Where is the pipe, the consumer, the hydrant, the valve, the water meter etc. A GIS is the state of the arte information tool to offer answers to this questions. But only to know the coordinates of an object is too less information, it is necessary to have also data of the surrounding to have an idea, if for example the hydrant is in the somewhere in the field, or just at the next crossroad. Everybody will find it with this additionaldata; none will find it just with coordinates in daily work!!!

2Existing Situation

2.1Data in the PUCs

The geodata used in the PUCs are too old, too less precise and not geo- referenced!!!

eg.: Pancevo Center:
ortho photos actually used by the PUC.

PUC / Theme / Vector/ Raster / resolution
[m] / cover hole supply area / description
Kraljevo / no orthophotos
Loznica / Satellite images / Raster / 3 / yes / black and white; aerial images .jpg; age unknown
Pancevo / Satellite images / Raster / 3 / yes / black and white; orthophoto .jgp with .jgw; age unknown
Pancevo / Satellite images / Raster / 1,5 / no / stitched Google earth screenshots; .jpg satellite images with .tab files; age unknown
Sabac / no orthophotos
Smederevo / no orthophotos
Sombor / no orthophotos
Vrsac / no orthophotos

2.2Data in RGA (Republic Geodetic Authority)

The RGA is running a geoportal in the Internet under

Republic Geodetic Authority
Working group for establishing geoportal
Bulevar vojvode Misica 39
Belgrade, Serbia
Telephone +381 11 2 650 538

web:

NSDI
"National Spatial Data Infrastructure (NSDI) represents an integrated geospatial data system, enabling users to identify and access spatial information acquired from different sources, from local, via national to global level, in a comprehensive manner."

With this tool we were able to check which data at which quality are available.
These are the results

eg.: Pancevo Center:(same place)

PUC / resolution
Center / resolution
surrounding
Kraljevo / 10cm / 40cm
Loznica / 10cm / 40cm
Pancevo / 10cm / 40cm
Pancevo / 10cm / 40cm
Sabac / 10cm / 20cm-40cm
Smederevo / 10cm / 40cm
Sombor / 10cm / 20cm-40cm

Land coverage of ortho-photos:

10cm
/ 20cm
/ 40cm

3Solutions

3.1WMS (

NSDI can provide the PUC online via the Internet with WMS technology.
This is a good solution for the future but according to the very poor network connections in the PUC I cannot recommend this solution

3.2GIS- Workstation with local data storage

According to the missing network infrastructure in the PUCs, this is the only way to implement a working GIS in the PUC actual circumstances. Therefore the geodata have to be stored on the local machine!

This is the reason why we have to get the data in a format that we can use it on desktop GIS.
But this leads to a further problem

4Procurement of GeoData

4.1Attempt to buy orthophotos on official way

To have an idea about the price we ordered an official offer for the orthophotos in Vranje (Programme 2).
We got the answer on 17th.June.2011.

A) Ortofoto za rezoluciju 10cm oko ortophoto for resolution 10cm about 9.556.390,49 RSD
B) Ortofoto za rezoluciju 40cm oko ortophoto for resolution 40cm about 2.722.429,28 RSD

With this high price it was obvious that we have to get the data via another way.

4.2Attempt to get orthophotos via the Municipalities

Our local expert Mrs. Danijela Stojkovac found in the "law on planning and construction" that
"RGA data can be purchased free of charge by municipalities if used for preparation of planning documents."

We are checking this option now!

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