DOCUMENTATION FOR SIDEWALK                                              02/09/01
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COMPREHENSIVE COVERAGE DESCRIPTION
----------------------------------
DATA LAYER SUMMARY
Date of Entry:   02/09/01
Coverage Name:   SIDEWALK        
Path:            JAMAICA\JAMVILL   
Description:     sidewalk centerline, Route 30, village of Jamaica, Vt       
Feature:         LINE   
Status:           2
Available:        02/08/01  

DATA MANAGER
Jeff Nugent                             
Windham Regional Commission             
139 Main Street, Suite 505              
Brattleboro, VT  05301                  
802-257-4547    

DATA AUTOMATION
Jeff Nugent                             
Windham Regional Commission                       
139 Main Street, Suite 505                        
Brattleboro, VT  05301                  

GEOGRAPHIC AREA and TILE STRUCTURE
Tile Structure:  NONE         (Avg.size: 0kB)
Area: village of Jamaica, Vermont                                 

DATA SOURCE & FORMAT
Source Map:   1:5000 orthophoto (scanned) and other supplemental data     
Source Date:  1991                           Data Format: pcArc/Info          
Source Scale: 1:5000                         Projection : State Plane meters            
Source Media: digital                                  Datum: NAD 1927  
SOURCE DESCRIPTION
  The main data source used was a scanned version of the 1991 1:5000       
Vermont orthophoto sheet for Jamaica.  It is based on aerial photographs   
taken in 1990.  The image was created by John Whitman of Readsboro,        
Vermont, who scanned and registered the image to Vermont State Plane       
coordinates.                                                               
  In several places, GPS points were taken to verify the sidewalk location.
 Field visits and ground photographs were also made in 2000 to further     
refine the data.                                                           

ACCURACY & TOLERANCES
Resolution:                               
Fuzzy:     0.000      Dangle:  0.000
FEATURE ACCURACY (in meters)
  The accuracy of this coverage is somewhat variable is probably no more   
than 1 to 2 meters.                                                        
  There are several reasons for this error.  The image, being scanned from 
a paper orthophoto, is not as sharp as conventional digital orthophotos    
produced by the state of Vermont.  Also, there appeared to be a slight     



DOCUMENTATION FOR SIDEWALK                                             Page   2
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FEATURE ACCURACY (in meters),  continued ...

discrepancy at some locations when a 500 meter state plane coordinate grid 
was compared to the grid lines on the orthophoto.  The variability observed
would make one think this is not solely a registration error but a result  
of the shrinkage and expansion of the source paper orthophoto.             

DATA AUTOMATION
Dates:  December 2000                   Software: pcArc/Info 3.5.2; ArcView 3.2 
Device: n/a (Resolution: 0.000)
Maximum RMS:     n/a                      
Update Schedule: none planned                                      
Last Update:     05/30/01

QUALITY CONTROL
  No formal quality control, other than verification using GPS, was        
performed.                                                                 

DESCRIPTION, FEATURE DEFINITION, METHODOLOGY, etc.
  This coverage contains the location of the centerline of sidewalks along 
Route 30 in the village of Jamaica, Vermont.  Both the public sidewalk     
along the road and sidewalks leading to buildings are included.  The       
coverage was created to give a general impression of the location of       
sidewalks in the village.                                                  
  A combination of data sources was used to locate the sidewalks.          
Sidewalks were first delineated in ArcView using a scanned version of the  
Vermont orthophoto covering the village.  Field visits, ground photographs,
and GPS points were then used to do final verification and fine tuning of  
the street edge.                                                           
                                                                           
                                                                           

LIMITS ON DATA USE & INTERPRETATION
  This coverage was created to give a general feel for the overall location
of sidewalks along Route 30 in the village of Jamaica.   Its primary       
purpose is cartographic; that is, to serve as a base map reference coverage
for mapping in the village.                                                

POLYGON ATTRIBUTE DESCRIPTIONS:    NONE.

ARC ATTRIBUTE DESCRIPTIONS:    NONE.

ANNOTATION DESCRIPTION:    NONE.

COVERAGE HISTORY & DEVELOPMENT DESCRIPTION:    NONE.

COVERAGE UPDATE DOCUMENTATION:    NONE.