Draft operational guidelines of digital india land records modernization programme (dilrmp) introduction

3.2.2 Point feature specifications

The features shown on maps as points, like wells, temples, trees, etc., are to be digitized as point features, for which the digitizing rules and coding scheme are given below:

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  The feature should be digitized as a point placed at the center of the raster image defining it.
  
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  There should only be one point at one location.
  
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  Each feature should have a unique ID.
  

3.2.3 Line feature specifications

The linear features shown as single line arcs on the map or linear double line features or symbols like rivers, roads, pipelines, etc. are to be digitized and compiled into the line layer for the village. The single line arc features, whether shown as continuous lines or broken lines, are to be captured from the map image. In addition to this, the double line roads, rivers, pipelines, etc. from the polygon coverage are also to be put into the line coverage. The feature coding guidelines are given below:

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  The river/roads depicted on the image represent the outside edges in case of double line features and should be digitized as such. The resulting vector should not deviate from the pixels defining it. These features should be captured only once and copied into the appropriate layers before building the topological relationships.
  
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  The feature should be vectorized in such a manner that the shape is captured and retained as it is.
  
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  The feature should be vectorized using optimum member of nodes/vertices so that the shape is retained and does not appear jagged.
  
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  The continuity of the features such as rivers, roads, etc. must be maintained across the map sheets.
  
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  At crossings, the features should be digitized with or without intersection, as the case maybe.
  
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  In case of single line features, they should be captured as a single continuous feature from one end of the feature to the other end without break.
  
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  In case of double line features the centerline should not be digitized. This will be represented by appropriate symbol.
  
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  There should not be any gap between two connecting features, nor any over-shoots; the features should be snapped to connecting features.
  
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