A GIS Based Tool to Digitize Polygon and Line Segments of a Black and White Map

Autori

  • K. Kundu Department of Computer Science and Engineering, Govt. College of Engineering and Textile Technology, Serampore, Hooghly, India
  • P Halder Department of Computer Science and Engineering, Govt. College of Engineering and Textile Technology, Serampore, Hooghly, India
  • J. K. Mandal Department of Computer Science and Engineering, University of Kalyani, Kalyani, Nadia, West Bengal, India

Parole chiave:

GIS, digitization, spatial data, vector map, raster map

Abstract

In this paper a GIS based tool has been proposed to digitize polygon and line objects throughefficient usage of RGB values of the segments of raster maps. For digitization of polygon,initially a closed loop is drawn inside the polygon segment. Beginning from the initial point ofthe closed loop, eight connected pixels calculation is incorporated to obtain the pointsexisting in between the loop and the actual boundary. The points which exist outside the loopare compared with the RGB value of the boundary points to calculate the boundary. Theboundary points are stored in the boundary array after arranging them in the cyclic order. Inthe existing tool, the polygon segment is digitized using the single click but the drawback isthat lot of memory space is required for the processing. The concept of single click boundarycalculation is also integrated in this tool to vectorise the small and/or narrow segments wheredrawing of closed loop inside the segment is difficult. For digitization of line, initially a pointis selected on the line. Then, gradually scanning is performed from that point to both sides ofselected point until it reaches the junction points. After that two arrays for both directions aremerged to obtain the actual line coordinates. The polygon boundary and line segments pointsare minimized by obtaining minimum number of points of the segment which reduce the spacecomplexity and minimize to the essential boundary points compared to the existing tools.Cite this ArticleKundu K, Halder P, Mandal JK. A GISBased Tool to Digitize Polygon andLine Segments of a Black and WhiteMap. Journal of Remote Sensing & GIS.2016; 7(1): 27–41p.

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Pubblicato

2016-03-17

Fascicolo

V. 7 N. 1 (2016)

Sezione

Research Articles

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