International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B4. Istanbul 2004 
  
  
geographic information system (Open GIS, 1999). We omit, 
therefore, the class hierarchy and operations in this paper. 
Figure 5 and Figure 6 show the classes for moving objects and 
the operations of some of major interfaces, respectively. 
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Figure 5. Moving Objects Classes 
IB | 4! Ieteraect eun orc 
| abet Sap ili { Tratast vertere Tima § 
j sheet Silas Eestues fisse Toi Tosfésst faTuma Y: 
| Tra Snap hes y akon ( ahject dirhatisien ): 
| Tina [] Susp iles by Vales ( ie columnIndau chject detaWalus §; 
| TesaD Sleeliy Vales [jan leen islas, objuct tellus }: 
| Tod) My Val [it le Tec a A Wh, a Holden. 
| 4 pes umtusn. unen 
| ehpect Prajert (i: 
| Vosa) Vu Tell 
| et Comob[ pu: ) 
| re Add | WEmtort mateat chjoct ÉeroValun 1: 
(ut Add {TOtaret iehactOb jee! +: 
| dr Todas! TOR jest anata BOE 3 
| TOtyect ads D 
i TORE All (dr Oak Tuch X 
j| TObyet Max (): 
| Tomar Bam (wor colssscTedua Y 
| TObdact Fmt (vd E) 
|TObwetkier (ek 
| TObct Mart — (TOtAct corren Oba ): 
| TObgect Prada ( TOhjre? Sarre Objet 
| TObact Affen — (MUwtont DorrantTima ]; 
| T@bgeet before {HW Imint cerrestTima 1: 
  
IT rit 
| 4! return series olia 
| object Saa aca. (ink ÁrcaIndza int faindax k 
; eet dabkoqertes [OI Nant FeumToms, MOLtie Ting 
FAperuTempordBalehu^ 0 Mod Renal — [ Iufecmrtry other Y: 
| Woolf Trek [ Litrisesairy har X 
| Mu Cabal | Etéésomatry star }- 
N 
|. Meet ka jolrt [| EM aomertry cher ). 
| died Crei) — (LS Spem Fry wire y 
| Mise Overlap ( Lifasmasrq ther k 
| Meet Sotersarti Listen toy pibar |: 
RE EIE E ena eet 
TapatioTamporolOperaior | abendhía Girbenas [LiSqematry aeac) 
i Difesa T rp Besedenp (i 
| Lédécomatry GCeseraxitisll(. 
| Th try Belfer Sale deranca: 
| entry Kan {dann bry sthark 
| En OH Fer (2 ethic) 
| IMB4umatry Takorsachan (LUdemahry ather): 
| Liam Byte ll daran (esent ry eher): 
MSDHEESULT. Éabens ( 19Secmriry osher rel bao! uEmisre 
|OMCHETSUAT Lesen [ LoSenmatey other. ref bead ifaosua I 
i BOEEFAT Fames ( 3diheemury ether, raf ond futan ) 
| | AOHEESULT. Rasidasi Lüfesenalry har el benl isLIrwshen ]: 
' AGOEEÉCUNQAT MMeete (LAepim try other cud brosl ciliata ): 
1 MTeujecterytalat im 
  
Figure 6. Moving Objects Operations 
A characteristic of operations included in ITimeSeries 
interfaces is the target of operation. It is not location 
information of moving points at any time operated but real 
location data stored in database. For example, the First(int k) 
operation returns A-th location information from first value of 
moving point, and the  Afrer(MOInstance | currentTime) 
operation returns similarly the nearest location information after 
currentTime in parameter. 
The operations of IMoving interface are different from those of 
ITimeSeries interface. IMoving interface provides functions of 
calculating location information at all time. For example, the 
114 
Snapshot(Instant instantTime) returns location information of 
moving object in instantTime, and Slice(Instant fromTime, 
Instant toTime) which has period parameter returns moving 
object between given time period. The Project() returns value 
objects projected by time. 
3.2 Moving Object Query Language 
We also revised the SQL syntax to support moving object 
described in section 3.1. We add some data type to present 
moving object data model (see Figure 7). 
Bosic Dota Type fJAOID 
Tempore] Dafa Type — | Teutant, Period. TInterval 
Spatial Dato Type Foint. Line, Polygon, Rectengle, MultPoimt, AultiLine, 
HiusltiPolygon, GcoCollaction 
  
  
  
Moving Beta Type HWnteger, MDeuble, MBool 
  
  
  
  
{Moving Value Type) | =~ ; 
Moving Date Type Mfoint, MLine, MPolygen, MEectongle, MultiMPoinf, 
(M6comatry Type) Multi Line, Mulit MPolygon, M&ecCollection 
  
Figure 7. Data Types for Moving Object Query Language 
In this section, we just describe some DML statements by 
examples. Base tables for all of the queries in this section are 
assumed as follows. 
CelluarPhoneUser ( id MOID, position MPoint ) 
Car ( id MOID, poistion MPoint, type string ) 
People ( id MOID, location MPoint, name string) 
Region ( id MOID, area MPolygon, name string) 
(1) Snapshot Queries 
In this section, the snapshot queries for moving objects are 
described. The snapshot query is usually used to search the 
locations of specific time. 
Example 1: Find the current location of cellular phone user 
1001 at time /. 
Select Project (Snapshot (position, ?)) 
From CelluarPhoneUser 
Where id = 1001; 
Example 2: Find the information on the moving object at point 
(x,y) at time 7. 
Select * 
From CelluarPhoneUser 
Where Equals (Snapshot (position, 1), Point (10, 20)) = TRUE; 
Example 3: Find 911 cars in Dacjeon now. 
Select id 
From Car, Region 
Where Contains (Snapshot (Car.position, NOW), Region.area) 
— TRUE AND Region.name - 'Daejoen'; 
Example 4: Find taxis within Ikm from point(x, y) now. 
Select id 
From Car, Region 
Where Withins (Snapshot (position, NOW), Buffer (MPoint 
(NOW, x, y), 1000)) = TRUE AND Car.type 7 'Taxis'; 
Example 5: Find the closest k delivery trucks to the point(x, v) 
now. 
Select id 
From Car 
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