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IV. RESULTS AND DISCUSSIONS
4.1. Data Collection Method
4.1.1. Preparing Raster and Vector Data
Based on raster data IKONOS used in the research, it can be determining certain study area of the research. The method to determine scope of research area
is using the GPS equipment to get the accurate data rectified image map. The research used raster data to produce vector data by digitizing on screen method.
The raster and vector data as the following:
Figure 10. Raster and Vector Data
Source : Kantor Pertanahan Kab. Bogor, 2002
4.1.2. Determine the Road and Drainage Area
The information of road and drainage area in Indonesia it is known as Daerah Milik Jalan and Daerah Bantaran Sungai was taken from the raster data
and vector data. Identification of the study area was doing by field survey. The
31 result of field measurement used for determining the road and drainage area or to
describe the land zone.
Figure 11. The Road and Drainage Area
The assumption of the road and drainage area on the block overlay on the parcel, it is from the field measurement. So the road and drainage area produced from the
parcel, further it will be used to get the clean block area.
Figure 12. Overlay Parcel and Block
Road and Drainage Area
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Figure 13. Clean Block
4.1.3. Determine the Road Type
The road type information was taken from the field survey and taken from the satellite data IKONOS. From the satellite data, the route of the road in the
study area was identified, and it was digitized on screen to produce the new data road type. In determining the type of the road in Desa Nagrak is not refers to the
role of road classification, because the size of study area is small. The process to identify the road type in this research as the following:
a. Primary road is kind of first alternative road route; it is Jakarta-Cianjur- Bandung, this route constructs of blacktop and it has 4 lines and the traffic
jam for 24 hours. This route categorized as primary road access type-1. b. Secondary road is kind of road route, it categorized as secondary road access
type-2. c. Local road access is kind of pathway, this route categorized as local road
access type-3.
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4.1.4. Determine the Road Centerline
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