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International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B4. Istanbul 2004 
  
Doing the same as for LuU, and based on the technical 
guidelines, we conduct the spatial resolution requirud for each 
land registration and land allocation shown in figure 4 below. 
    
    
—**—-Land allocation 
a= | and registration 
£d 
e 
Spatial resolution (m) 
Interested area 
  
Urbani Urbani! Rural! Ruralll Forest 
High land 
Figure 4: Spatial resolution of LP in LR group 
3.3 The multi thematic resolution of spatial data 
As stated above, land use is the core information contained in 
both LuU and LP. For the case of LuU, the thematic resolution 
is defined as land use classes mentioned in LUCS. Based on the 
analysis of the requirement, LuU is required detailed at 60 land 
use classes and at four levels of LUCS for all management 
levels. 
  
LuU in MLU group 
Level 1 Level 2 Level 3 Level 4 
LP in LR group 
Level 1 Level 2 Level 3 
  
  
  
  
  
  
  
Vietnam land use classification system 
  
  
  
  
Figure 5: Thematic resolution between land registration group 
and macro land use management group 
For LP, thematic resolution is defined as land use class in 
LUCS. Differently, the land use class required for LP is not 
detailed at all 60 land use classes and at four levels in LUCS. 
LP is required with 30 kinds of land use classes, which is 
normally at level 3 in LUCS. Land user can have right to use 
land at any sub-class of the land use class, which is registered in 
register book. For example, if the land user has land use rights 
at class I.1.a. This land user can use at any sub-class 1.1.a.1, 
Lia2 Lia3orll ad 
Figure 5 illustrates the difference of thematic resolution of SD 
required by LR group and MLU group. The red cell means the 
land use class required by each discipline group. 7 
  
241 
3.4 Conclusion & Discussion 
Based on the above quantified results and concerning to the 
ability of data genera!izatiz between resolutions, we come to 
eznzloasus as DClOW: 
- From LR group, land use data can be abstracted and 
generalized to meet the technical requirements of four 
administrative levels and MLU group. 
- For spatial resolution requirement: LP can be abstracted 
and generalized to all detailed resolution of LuU required. 
- For thematic resolution: LP can be abstracted and 
generalized to detail at level 3 in LUCS. 
There are three discussions relating to the issues of data 
acquisition and data management as follow: 
1) Land use data abstracted from LR group, can be generalized 
and used for LUM group. The limitation of that thematic 
resolution of data after generalization only reaches at level 3 
LUCS, can be overcome in combination with other acquisition 
means such as, field survey or remote sensing technology (RS). 
2) In the other hand, this ability (generalized land use from LR 
group to MLU group) coincides with the characteristics of 
Vietnam LA, where much attention is paid for land use aspects. 
3) However, if LR group is place where land policy 
implemented at practical level then the information captured by 
this group must be the most detailed available in LA system. 
So, why does MLU group require land use information even 
more detail than LA system can produce? This might be another 
side of the question of inconsistency and inaccuracy of data 
management in Vietnam LA. 
In short, the quantification work not only shows ability of a 
framework for land use data generalization from LR group to 
MLU group, but also the complication and the issues of data 
itself in Vietnam LA system. 
4. CASE STUDY 
4.1 Case study introduction 
Case study has the objectives: (1) to test the ability of land use 
data be abstracted and generalized from LR group to MLU 
group; and (2) to experience the combination with RS to detect 
land use data detail at level 4 of LUCS. In detail, land use unit 
at class I.1.a is generalized from LR group. RS will supports to 
detect LuU at sub-class of I.1.a. Detail information for class 
[.1.a and its sub-class is described as following: 
IL. La; Rice & premature rice 
Ll: 3 crops rice 
[.1.2.2: 2 crops rice 
].1.a.3: 1 crops rice 
I.1.a.4: Premature rice 
The case study area is a whole Bacly commune in Ly Nhan 
district, Hanam province. Data of LR group has been 
computerized for the whole Bacly commune. The software MS 
Access, MapInfo and Ilwils 3.0 are used for data processing. 
Data for case study includes of LP from LR group (updated in 
year 2000) and satellite image Landsat 7 ETM+ (acquired 
2000).