CHAPTER 3. LAND VALUATION – LAND PRICE DETERMINATION AND ESTABLISHING REGION MAPS OF LAND VALUE AT CUA DAI WARD, HOI
3.2. Building a database serving land valuation
In order to determine the land price, in addition to the local detailed price list issued by the government, other legal documents related to land valuation must also be based:
- Pursuant to the Law on Organization of the People's Council and People's Committee dated 26 December 2003.
- Pursuant to Land Law dated 29 November 2013;
- Decree No. 44/2014/ND-CP dated May 15, 2014 of the Government on land prices. This decree provides for the method of land valuation, construction, adjustment of land price brackets, land tariffs and land price determination. The detail of the method of land valuation was shown at article 4, article 5, chapter 1.
- Decree No. 104/2014/ND-CP dated 14 November 2014 by the Government regulating the land price framework. In article 3, detailed regulations on the land price brackets of each land category, from which the land price brackets of economic zones stipulated in Article 4.
- Circular No. 36/2014/TT-BTNMT, dated June 30, 2014 of the Ministry of Natural Resources and Environment, detailing the method of land valuation, adjusting the land price index, determining specific land prices and providing accurate advice about land valuation. The circular detailed the method of land valuation in chapter 2,based on land pricing method to set out land price, section 1, chapter 3. After the land price has been set up, the land price list must be adjusted to suit each locality defined in Section 2, Chapter 3.
- Decision No. 48/2014/QD-UBND dated 25 December 2014 by the People's Committee of Quang Nam, regulation on land prices, land price list for the period 2015-2019 in the province, published with detailed land price list.
- Decision No.43/2015/QD-UBND dated 22 December 2015 by the People’s Committee of Quang Nam, edited, added some content in Decision No48. 48/2014/QD UBND.
- Decision No.30/2016/QD-UBND, dated 20 December 2016 by the People’s Committee of Quang Nam province, edited, added some content in Decision No.48/2014/QD-UBND 25/12/2014 and Decision No.43/2015/QD-UBND 22/12/2015 by the People’s Committee regulate regulation on land prices, land price list for the period 2015-2019 in the province.
3.2.2. Application GIS in establishing database serving land valuation a. Data collecting and Data standardization
Cua Dai Ward is comprised of 32 cadastral maps measuring 1/500 in 2005.
All of these maps are digitized in the ".dgn" format and have been revised up to 2014.
b. Establishing spatial database
This research converted the Microstation cadastral map into ArcGIS for editing to create the spatial database of the study area.
Figure 3.1: Spatial data as .dgn format running in Microstation
To build the spatial database, create the directory in ArcGIS by converting the Geodatabase, Feature Dataset created for the cadastral map on Microstation to ArcGis.
In the mapping process, in order to improve accuracy, reduce errors when initializing the geodatabase, the coordinate system with the axis of the province neeed to be specified.
After creating and classifying objects on ArcGis, transfer the map data from the cadastral map on the Microstation platform to ArcGis through the Load Data function.
The data of the land parcels after the transfer is ‘line’ format data, so it is necessary to create the area for the closed lines as polygon by using use the Feaure to polygon tool in ArcToolbox.
Figure 3.5: Land parcels after creating polygons
Proceed to do the same with the remaining pieces, open all the layers in one platform, merging by the Merge function in the Arctoolbox to link the spatial database in each map together to get the spatial database of the research ward.
Figure 3.3: Spatial Data at Cua Dai ward c. Establishing attribute database for land parcels
The built-in attribute data includes basic cadastral data and land valuation data such as unit price for land lease, land plot direction, coefficient, facade, road name, Street position...
Establishment of basic database for each land plot: Basic properties of land plots built for the area according to the cadastral records. The information is compiled from: Cadastral map, register book, cadastral book, land-related change monitoring book,...
* ‘Land-plots’ layer:
Table 3.1: Data fields of ‘land_plots’ layer
No. Fields name Type Explaination
1 Stt Short integer (5) Ordinal number in attribute table
2 Soto Short integer (5) The ordinal number of the cadastral map 3 So_thua Short integer (5) The ordinal number of parcel in the
cadastral map
4 Csd Text (20) Full name of land owners
5 Dien_tich Float (10, 2) Acreage (m2) 6 Nguongoc Text (20) Land use origin
7 Loaidat Text (10) Abbreviation of land types
8 Mdsd Text (30) Land use purposes
9 THCapGCN Text (15) Certificate of land use rights, ownership of houses and other land–attached assets
10 Vitri Short integer (5) Land parcel position 11 DongiaQD Long integer (15) Land state price per 1m2
12 Mattien Float (5, 2) The section adjacent to the road of the
parcel
13 Huong_dat Text (10) Land parcel’s direction
14 TStrendat Text (15) Situation of land-attached assets 15 GiaTT Long integer (20) Land market price
Figure 3.4: Spatial data and attribute table in ‘land_plots’ layer
* ‘Traffic’ layer:
Establish some fields as shown in table 3.2:
Table 3.2: ‘Traffic’ layer’s fields
No. Field names Types Explaination
1 Stt Short integer (5) Ordinal number
2 Soto Short integer (5) Ordinal number of cadastral map
3 Ten_duong Text(20) Street