Manuel Pallage STAR Informatic Eric El-Osta STAR Informatic

Transcription

1 Manuel Pallage STAR Informatic Eric El-Osta STAR Informatic

2 !" 2 Brussels Public Transportation Company (STIB) Belgium s largest company of the kind Serves 1,100,000 inhabitants and 200,000 daily commuters Exploits a vast network of bus, tramway and subway lines Long-term STAR INFORMATIC customer for track design and GIS applications Owns topographic database of all infrastructures General requirements for specific GIS application Deliver and maintain inventory of tracks assets In order to manage Company budget, production of thematic studies based on tracks attributes Quick and easy access to portion of track via web-spatial navigation for maintenance teams

3 #" 3 Major technical constraints for this application Must exploit the existing topographic GIS database of all infrastructures established around STAR products Must use track centerline as geometric support Attributes values that will be used to qualify tracks network are based on curvilinear abscissa Names of attributes to be taken into account Type of track, type of covering, age of rails, age of foundations, rails depreciation, foundations depreciation, limit of works, life expectancy of rails, life expectancy of foundations, rails value, foundations value, locality, street, type of section, type of site, mode of traffic, operating speeds, miscellanous,

4 $% $%" 4 LRS major advantages for data stored in Oracle Spatial Capability of locating attributes along a linear feature with only one parameter usually called measure- instead of two or three such as in Geodetic or Cartesian Space Sections or points of a linear feature can be dynamically referenced by indicating the start and end locations along the feature without explicitly storing them Seg1,(0) Seg1 (100) Dynamic Segmentation Seg1 (200) M LRS Seg 1 Seg1 (130,160) start end

5 5 Application requirements suggest using Oracle Spatial LRS The concept of «measure» on LRS in its most basic form is curvilinear abscissa There are many helpful functions in Oracle Spatial for managing LRS Data in STAR format can be easily converted in Oracle Spatial LRS format We have a web-gis platform natively interacting with Oracle Spatial and offering a very customisable HTMLbased light client

6 & '&'(!" (20,25,15) 6 (10,10,0) (30,10,30) (40,10,40) (20,25,80) (10,10,0) (30,10,95) (40,10,105)

7 '&'( #" 7 Measure can be used obviously as curvilinear abscissa!"#$% % &$ '( ) * + %,-%., / / 0

8 (' $%!" 8 Track management feature Locating specific point on track by its measure Identifying geometry that corresponds to portion of track Merging two tracks into one Oracle Spatial LRS function SDO_LRS.LOCATE_PT SDO_LRS.CLIP_GEOM_SEGMENT SDO_LRS.CONCATENATE_GEOM_SEGMENTS Splitting one track into two Overriding any previously assigned measure on a track by new values on start point and end point SDO_LRS.SPLIT_GEOM_SEGMENT SDO_LRS.REDEFINE_GEOM_SEGMENT

9 (' $% #" 9, 1 2 0/ 2 2

10 ) $%!" 10 First step : native geometric data to Oracle Spatial 2D. 32 ',* % % 4$ :!:::; / < 0 6:!:::; ' / *

11 ) $% #" 11 Second step : Oracle Spatial 2D to Oracle Spatial LRS < 3!"#$% % &$ % 2 ( 0)'=*

12 ) $% *" 12 Third step : attributes data in separate tables > ' * /,0 / 1 TYPE_REVET CP ID LRS_STIB_FK START_M END_M TYPE_REVET

13 +,!" 13 3 / 5 ' 5 /

14 +, #" Session file sample 14

15 +, *" 15 Session file features Oracle connection parameters Dataset structure for each targeted thema Key feature is QUERY (one by thema) can be expressed in pure Oracle SQLPlus geometric result is obtained via Oracle SDO_API application flexible enough to get and display results «on the fly» Underlying data model for one attribute CP TYPE_REVET ID LRS_STIB_FK START_M END_M TYPE_REVET CP ID LRS_STIB NUM_RESEAU NUM_MODE NUM_ZONE NUM_REFGRAPH NUM_TRONCON GEOM LONGUEUR

16 +, -" Project file excerpt Raster background 16 Attribute name Attribute value Colour associated to value

17 )!" Step one : select one track and one attribute to qualify 17 Track Identifier Attribute name

18 ) #" Step two : assign value in each track portion for chosen attribute 18 Start measure End measure Attribute value

19 %' 19

20 ' 20 Oracle Spatial LRS concept and functions proved to establish solid foundation for dynamic segmentation-based applications GIS application based on Oracle Spatial LRS can be efficiently developed, provided native interaction with Oracle is possible Application enhancement expected with Oracle 10 g georaster imaging and topology extension.