A Conversion Experience: Agricultural District Maps
A Conversion Experience:Agricultural District Maps
11/14/2000
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Table of Contents
Author: Susan Hoskins
A Conversion Experience:Agricultural District Maps
Agricultural District Program
Districts Described
Agricultural District Maps
Analog Map Set
Analog Map
Digital Data Development
Collaborators
Conversion - Preparation
Conversion - Post-Scanning
Editing
Open Polygons
Georeference
Omission and Commission
Other Errors
Digital Boundary
Digital Boundary
Distribution
Status of Conversion
Learning from Experience
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A Conversion Experience:
Slide 1 of 20
Notes:
Create a digital boundary data set
Mapping program housed at Cornell since 1977.
Five years ago we began the process of creating a digital data set ag district boundaries from the analog Ag
district map data set
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Agricultural District Program
Slide 2 of 20
Notes:
What are agricultural districts?
Begun in 1974, state legislation provided for the creation of agricultural districts. The districts provided a
mechanism for farmers to keep viable agricultural land in farming by providing an agricultural assessment.
Landowner initiated, local government administered.
Currently 8 million acres in the program.
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Districts Described
Slide 3 of 20
Notes:
Individual landowners identify property they wish to be included in a district by tax parcel.
These tax parcels, usually in a geographic proximity, are grouped into a district.
Documentation submitted for creation of a district includes, narrative and numerical data. And a map.
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Agricultural District Maps
Slide 4 of 20
Notes:
The standard established when the program began in the early 1970’s was the 1:24,000 scale NYS DOT 7.5’
planimetric quad series. Base maps were produced as mylar prints.
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Analog Map Set
Slide 5 of 20
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Analog Map
Slide 6 of 20
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Digital Data Development
Slide 7 of 20
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Collaborators
Slide 8 of 20
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Conversion - Preparation
Slide 9 of 20
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Conversion - Post-Scanning
Slide 10 of 20
Notes:
ArcINFO coverages
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Editing
Slide 11 of 20
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Open Polygons
Slide 12 of 20
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Georeference
Slide 13 of 20
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Omission and Commission
Slide 14 of 20
Notes:
Largest number of errors and most complex edits
To understand how these happen, the scanning process needs to be understood.
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Other Errors
Slide 15 of 20
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Digital Boundary
Slide 16 of 20
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Digital Boundary
Slide 17 of 20
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Distribution
Slide 18 of 20
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Status of Conversion
Slide 19 of 20
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Learning from Experience
Slide 20 of 20
Notes:
Objective - Index at 1:250,000 or 1:100,000 scale or a surrogate for 1:24,000?
Individual maps to statewide data base - cartographic presentation of differs Map interpretation - original map criteria not suitable for the scanning process.
As errors were uncovered in QC, developing an efficient correction strategy required researching the source of
the errors. Tracking records on individual districts were kept for the the preparation phase, but not as complete
for all phases.
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