GIS-25: SCANNING AND CONVERSION

Order No:

GIS-25

Total Length:

75 minutes



Automated Map Data Conversion

Reference No:

GIS 25-1

It is generally agreed within the GIS community, that the cost of converting hard-copy source maps into intelligent attribute-coded vector data constitutes 60 to 80% of the total GIS expenditure. Incorrectly converted and misrepresented data is worthless. For this reason the evaluation and procurement of automated conversion systems should be as well planned and as thorough as the procurement of the GIS systems itself.

Lecturer:

  • Wayne C. Coleman, Laser-Scan, Sterling, VA, Laser-Scan, Sterling, VA

Suitability for
Level of
Instruction:

  • University (Undergraduate)
  • Advanced Research
  • Professional

Duration:

17 minutes

Year of
Presentation:

1992

 

Impacts Of Scanning Resolution On GIS Data Conversion

Reference No:

GIS 25-2

Map scale, data accuracy, line work quality, and data intensity influence choosing a scanning resolution. Resolution, in turn, impacts machine sizing, processing, and storage requirements. These cause-and-effect relationships have been evaluated using Line Trace Plus (LTPlus) data capture software at Infotec Development's GIS/LIS facility in Portland, OR. LTPlus was developed by the U.S. Forest Service in cooperation with the Soil Conservation Service. It operates under UNIX on a PC 386+ workstation.

Lecturer:

  • Lisa Klapwyk, Infotec Development, Inc., Portland, OR

Suitability for
Level of
Instruction:

  • University (Undergraduate)
  • Advanced Research
  • Professional

Duration:

18 minutes

Year of
Presentation:

1992

 

Preparation of Scanner-Ready Manuscripts

Reference No:

GIS 25-3

With the increased availability of scanning technology, more organizations are recognizing it to be a \"quick and easy\" means of GIS data capture. However the speed and accuracy of this approach is strongly tied to the quality of the source manuscripts. This presentation discusses criteria for evaluating the suitability of existing manuscripts for this type of capture.

Lecturer:

  • Daniel Haskell, Infotec Development Inc., Portland, OR

Suitability for
Level of
Instruction:

  • University (Undergraduate)
  • Advanced Research
  • Professional

Duration:

17 minutes

Year of
Presentation:

1992

 

Scanning In Conjunction With Automated Raster To Vector Technology

Reference No:

GIS 25-4

Perhaps even more significant than the scanning component of the process are the developments in raster to vector conversion technology. This technology utilizes the end product of a scanner (raster or bit map data) and produces an intelligent vector-based file. It can then be cleaned and built to produce a fully-functional, accurate GIS product.

Proper utilization of the automatic capabilities found in both raster to vector and GIS software can result in the conversion of source maps to fully structured GIS files with very little operator time required. Consequently, the cost of data collection can be substantially less than other methods of conversion. To ensure the most cost-effective execution of such a project, it is imperative that several critical steps be followed to maintain conversion efficiencies.

Lecturer:

  • Jeff Marceil, Scan Conversion Services Inc., Burnaby, BC

Suitability for
Level of
Instruction:

  • University (Undergraduate)
  • Advanced Research
  • Professional

Duration:

18 minutes

Year of
Presentation:

1992

 

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