ng 
Crain, Ian 
  
  
  
  
  
  
  
   
  
  
  
  
  
  
  
  
  
  
   
     
      
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
1- Core Datasets 
1.12- MAJOR HARVESTING fi 1.2- INFRASTRUCTURE 
ACTIVITIES 
Admin. Area Code (T) Infrastructure ID 
Resource Quantity Infrastructure Name (T) 
AOT * locate =| Infrastructure Date 
— agriculture “ic 
N re = ones Infrastructure Type (T) 
— fisheries Infrastructure Value (1.13- WATER QUALITY | 
— minerals E N MEASUREMENTS 
i. ii > - Moniroring Stn ID 
5 Some 1.3- SOIL CLASS ..,] Date/Time 
1.11- GEOLOGY ed Ee Water Quality Values 
Soil Type (T) Water Quantity Values 
Polygon ID : Terrain Class (T) (use MRC db) 
Geological Class (1) Li GEOREFERENCED r locate 1 Slope Class (T) \ 
OBJECTS \ 
S (GIS COVERAGES [— locate ( N 
! 3 E f NETT 1.14- SOIL ANALYSIS 
A ; ocate 9 1 4. VEGETATION COVER SAMPLES 
1.10- LAND USE ] Coverage ID } 
d Coverage Type Polygon ID Moniroring Stn ID 
Polygon » Last Update Cover Type (T) | Date/Time 
Land Use Class (T) locate Cover Sub-type (T) Soil Sample Values 
Land Use Sub-class (T) (eg: pH. conductivity, 
\ ; i C, K, N, P concentrations) 
E : ^ 1.5- AIR QUALITY N 
1.9- TOPOGRAPHY < locate locate MEASUREMENTS 
locate — T 
Feature ID Monitoring Stn ID 
Feature Type (T) locate locate Date/Time 
Feature Value Air Quality Values (1) 
Feature Name | 1.7- CLIMATE S 
T i f 
ZONATION 1.6- DEMOGRAPHY 
; Polygon ID 
1.8- ADMINISTRATION Climate Type (T) Population Density 
BOUNDARIES Seasonality (T) Population Growth Rate 
Boundary ID Rainfall Ranges Age Profile Values (T) 
Boundary Name (T) Temperature Ranges | Ethnic Profile Ratios (T) 
| Boundary Type (T) 
  
  
  
  
Figure 4: Conceptual Data Model — Core Datasets 
  
6.4 Core Datasets Model 
Figure 4 presents the conceptual data model for the 13 Core Datasets. Each box represents one logical entity, and within 
the box are noted the principal attributes of each entity. For diagrammatic purposes, these have been simplified, but are 
specified in detail in the Data Standards (ADB, 1998b). 
The annotation "(T)" following an attribute indicates that a coding or classification standard was required, and has been 
defined in the Data Standards. The lines between the boxes indicate the connections or relationships between the logical 
entities. Some simplification has been made for visibility. For, example, both the Demography (1.6) and Major 
Harvesting Activities (1.12) would share the connection to the Administrative Boundaries (1.8), and this has not been 
shown. The necessary linkage of the Water Quality Measurements (1.14) to the Mekong River Commission database 
has also not been made explicit. 
A 14th logical entity, Georeferenced Objects, has been added, and this is the core of the spatial database design. The 
Georeferenced Objects would normally be implemented by linking to a commercial GIS, such as Arc/INFO. The points, 
lines and polygons which make up the geographic component of these core dataset entities would be held in the 
Georeferenced Objects, as a set of spatial data layers or "coverages". 
  
International Archives of Photogrammetry and Remote Sensing. Vol. XXXIII, Part B7. Amsterdam 2000. 293