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Planimetric Mapping

by Yashwant Singh
The 'smart' revolution.
We are living in a generation where most common and important word is 'smart'. From smart people to smart phones and from smart maps to smart cities everything is getting smarter. Geospatial technology is progressing by leaps and bounds towards this smartness. The technology itself is getting smarter and contributing in other smart developments as well. 
 
                                         This kind of urban planning need a smart database - plannimetric maps.
 
Planimetric Maps
Smart is that which is accurate and precise. This concept needs a database with almost zero tolerance for errors. Such data is produced in planimetric mapping. This is something like 'giving life to an image'. This kind of job is executed using high resolution satellite imagery or aerial photographs or UAV imagery. This type of map simply depicts features horizontally and vertically and the accurate distances between them. This include creation of a database having multiple layers like Paved Roads, Unpaved Roads, Drive ways, Parking areas etc.
 
How they are created ?
Aerial photographs are used in most of the cases. These photographs are used to identify the planimetric data, using advance software tools and experienced photogrammetry team. Stereo pair aerial imagery is used in photogrammetry process to identify the exact position of surface points. Vector data produced in this method consist both manmade and natural features. These features are represented three dimensionally as lines, points and polygons. Anything visible in an imagery can be digitized.  
 
                                                       High resolution aerial photographs are used
 
Common features
This is an act of detailed mapping and involve almost all the features visible on a stereo pair. Some of the common features are as follows:
  • Street and water centrelines
  • Sidewalks
  • Culverts
  • Utility Lines
  • Building Footprints
  • Vegetation
 
Detailed Classes
 
Roads (paved/unpaved) Shoulders Driveways Parking     Concrete Alleys
Curb Steps    Trails Road Median/Island Golf Caret Path Building/Courtyards
Ruins Decks Patios Canopies Tanks Silos
Bunkers Foundations Smokestacks Water Tower StairWays Pools
Windmills Billboards Mailboxes Parking Meter Bus Stop Retaining Walls
Rock Wall Cattle Guard Gates Fences Man Hole Catch Basins
 
Many other features are there which can be extracted as per the requirements.
 
                                                                                            Output Data
 
Significance of such data
 
3D planimetric data is useful in many ways for spatial analysis. Some are as follows:
 
  • Infrastructure management
  • Urban planning
  • Utilities planning
  • Taxation
  • environmental issues
  • Transportation coordination
  • 3D city modeling
  • Terrain visualization 
  • Industrial design
  • Education
  • Animation  and entertainment 
  • Preservation of historical sites
  • logistics and security
Summary
Geospatial technology is getting better day by day. Planimetric maps consist both manmade and natural features. They are created using photogrammetry technique. Stereo pair imagery of aerial photographs are used for this purpose. Many classes are involved like roads, buildings, driveways, parking and many more. These precise and accurate maps are used for urban planning, utilities planning, infrastructure management, taxation etc.

SATPALDA is a privately owned company and a leading provider of satellite imagery and GeoSpatial services to the user community. Established in 2002, SATPALDA has successfully completed wide range of photogrammetric and Remote Sensing Projects.

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