METADATA: OSWEGATCHIE RIVER AND BLACK RIVER
DRAINAGE BASINS -
WETLANDS DATA LAYER
Return to Page One of OB Wetland Metadata
2 DATA QUALITY INFORMATION
2.1 Attribute Accuracy
2.1.1 Attribute Accuracy Report: Attributes assigned to polygon features consist of
unique User-Ids, quadrangle identification codes, and wetland labels. Linear attributes
include a User-ID (to distinguish between quadrangle borders, the study area
boundary, and wetland arcs), ARCVALUE to uniquely identify the quadrangle borders
throughout the study area, and wetland labels. Polygon and linear wetland labels were
derived from photointerpretation techniques. Wetland labels were entered by
superimposing the orthophoto label overlay upon a hard copy of the wetland coverage
arcs and labels on a digitizing table. To minimize typographical errors, both polygon
and linear wetland labels were entered utilizing a digitizer menu consisting of columns
representing wetland label components. Label columns were concatenated in dBase IV
to create a unified wetland cover type label. Hard copies of wetland coverages were
printed and labels were individually checked against the orthophoto overlays. Arc
User-IDs and ARCVALUE were visually checked on the computer screen for integrity
and labeling accuracy.
2.1.2 Quantitiative Attribute Accuracy Assessment
2.1.2.1 Attribute Accuracy Value: Unknown
2.1.2.2 Attribute Accuracy Explanation: Polygon and linear wetland cover type
labels were derived from photointerpretation techniques. All photo overlays
were checked by an independent interpreter for missing wetlands, uplands
delineated as wetland, incorrectly delineated polygons, missing wetland labels,
and incorrect wetland labels. Photo overlays were directly compared to
orthophoto overlays utilizing a Kail Reflecting Reducer/Enlarger. This process
helped to verify the transfer of wetland cover type labels and to discover missing
arcs. Digitized and scanned coverage hard copies were directly compared to
orthophoto overlays to check for missing arcs. The process of digitally labeling
the wetland coverages also helped to resolve some missing, incomplete, and
nonsensical labels. A hard copy was made of each coverage and both arc and
wetland labels were compared to the orthophoto overlays. Linear wetlands were
color-coded to facilitate proofing. Finally, all wetland labels were printed in
tabular form and proof-read to ensure both complete labeling of the coverage and
logical label content.
2.2 Logical Consistency Report:
Polygons: All polygons within the study area were required to possess either a wetland
or upland cover type (i.e., a SYSTEM entry and therefore a final NWILABEL entry
were mandatory). During the labeling process, coverage polygons were checked for
the presence of a label point and incomplete polygons were repaired. All wetlands
were digitized (or for scanned files, transformed) into a blank quadrangle file
containing quadrangle boundaries and tics and therefore only linear wetlands were
allowed to exhibit a dangle nodes.
Arcs: Only linear wetlands received a wetland label. Printouts were made
color-coding linear wetlands to help discover those linear wetlands missing a label or
those which were labeled improperly.
General: PC ARC/INFO's Dissolve program was used to identify adjacent polygons
inappropriately possessing the same wetland label and to identify arcs that should have
received a wetland label but did not.
Inter-coverage consistency: PC ARC/INFO's Edgematch routine was utilized to match
arcs between coverages. Wetland labels along adjacent coverages were proof-read
using ARCVIEW 2.0 and corrected in PC ARC/INFO ARCEDIT.
2.3 Completeness Report:
Extensive quality assurance/quality control measures were taken for all steps of dataset
creation. It is expected however, because of the dataset complexity and the derivation
of data from photointerpretation techniques, incorrectable error and a few mistakes
may be present. Identifiable mistakes will be corrected periodically or as needed. All
wetland labels were reviewed for conformance to National Wetlands Inventory
standards.
2.4 Positional Accuracy
2.4.1 Horizontal Positional Accuracy
2.4.1.1 Horizontal Positional Accuracy Report: The outer arc of all individual
quadrangle-based wetland files correspond to USGS 7.5' quadrangle boundaries.
Wetlands were digitized or transformed (scanned files) into the quadrangle
template with a UTM Zone 18 projection and metric coordinates. Horizontal
positional accuracy has error potential from several different steps:
photointerpretation, transfer to orthophotos, and digitizing techniques. Maximum
allowable RMS error was 0.003 for each digitizing session. While great care was
taken at every step, no formal quantitative accuracy assessment was conducted.
An attempt was made in all mapping operations (delineation, transfer, digitizing)
to have horizontal accuracy to be correct to plus or minus one pencil width (about
12 meters).
2.4.1.2 Quantitative Horizontal Positional Accuracy
2.4.1.2.1 Horizontal Positional Accuracy Value: (see section 2.4.1.1)
2.4.1.2.2 Horizontal Positional Accuracy Explanation:
no formal assessment conducted (see section 2.4.1.1)
2.4.2 Vertical Positional Accuracy
2.4.2.1 Vertical Positional Accuracy Report: No vertical coordinates are
associated with this data set. Topographic displacements of air photo delineations
were corrected to match USGS orthophoto quadrangles using a B&L Stereo
Zoom Transfer Scope.
2.4.2.2 Quantitative Vertical Positional Accuracy Assessment
2.4.2.2.1 Vertical Positional Accuracy Value:
2.4.2.2.2 Vertical Positional Accuracy Explanation: (see section 2.4.2.1)
2.5 Lineage
2.5.1 Source Information
2.5.1.1 Source Citation: Northern Forest Lands
Quadrangle File (derived from the data set
"NYTM Coordinates 11/22/89" purchased from
NYSDOT - Mapping Services Bureau)
2.5.1.2 Source Scale Denominator: None
2.5.1.3 Type of Source Media: Disk
2.5.1.4 Source Time Period of Content
2.5.1.4.1 Source Currentness Reference: 19910725
2.5.1.5 Source Citation Abbreviation: NFLSQUAD
2.5.1.6 Source Contribution: Subsets provided
quadrangle border and corner tic templates
for digitizing into or for transforming
scanned files to ground coordinates
2.5.1 Source Information
2.5.1.1 Source Citation: Oswegatchie/Black River
Watershed: Watersheds (48 7.5' quadrangle-based
coverages of immediate watersheds; includes
Adirondack Park boundary)
2.5.1.2 Source Scale Denominator: Original source maps
24000 (7.5') or 25000 (7.5' x 15')
2.5.1.3 Type of Source Media: Disk
2.5.1.4 Source Time Period of Content
2.5.1.4.1 Source Currentness Reference:
Publication date of source maps
2.5.1.5 Source Citation Abbreviation: WSQUADS
2.5.1.6 Source Contribution: Quadrangle-based study
area boundary
2.5.1 Source Information
2.5.1.1 Source Citation: National High Altitude
Aerial Photography
2.5.1.2 Source Scale Denominator: 58000
2.5.1.3 Type of Source Media: 9"x9" color infrared
vertical aerial photography transparencies
2.5.1.4 Source Time Period of Content
2.5.1.4.1 Source Currentness Reference:
Flight dates (1985-1986)
2.5.1.5 Source Citation Abbreviation: PHOTOS
2.5.1.6 Source Contribution: Source for wetlands
delineations and cover types
2.5.1 Source Information
2.5.1.1 Source Citation: USGS 7.5'
orthophotoquads
2.5.1.2 Source Scale Denominator: 24000
2.5.1.3 Type of Source Media: Stable-base film
2.5.1.4 Source Time Period of Content
2.5.1.4.1 Source Currentness Reference:
Publication date (1976-1981)
2.5.1.5 Source Citation Abbreviation: ORTHO
2.5.1.6 Source Contribution: Map base for transfer
of wetland photo overlay delineations for
all but Remington Corners, Belfort,
Crystal Dale, and Brantingham quadrangles
2.5.1 Source Information
2.5.1.1 Source Citation: NYS DOT planimetric maps
2.5.1.2 Source Scale Denominator: 24000
2.5.1.3 Type of Source Media: Stable-base film
2.5.1.4 Source Time Period of Content
2.5.1.4.1 Source Currentness Reference:
Publication date (1969)
2.5.1.5 Source Citation Abbreviation: PLAN
2.5.1.6 Source Contribution: Map base for transfer
of wetland photo overlay delineations for
Remington Corners, Belfort, Crystal Dale,
and Brantingham quadrangles
2.5.1 Source Information
2.5.1.1 Source Citation: USGS 7.5' ORTHO or PLAN (see
above) wetlands polygon overlay
2.5.1.2 Source Scale Denominator: 24000
2.5.1.3 Type of Source Media: Stable-base film
2.5.1.4 Source Time Period of Content
2.5.1.4.1 Source Currentness Reference:
Date of imagery used for wetland mapping
(1985-1986)
2.5.1.5 Source Citation Abbreviation: ORTHO-POLY
2.5.1.6 Source Contribution: Wetlands were digitized or
scanned from these overlays.
2.5.1 Source Information
2.5.1.1 Source Citation: USGS 7.5' ORTHO or PLAN (see
above) wetlands label overlay
2.5.1.2 Source Scale Denominator: 24000
2.5.1.3 Type of Source Media: Stable-base film
2.5.1.4 Source Time Period of Content
2.5.1.4.1 Source Currentness Reference:
Date of imagery used for wetland mapping
(1985-1986)
2.5.1.5 Source Citation Abbreviation: ORTHO-LABEL
2.5.1.6 Source Contribution: Wetland labels were
digitized from these overlays.
2.5.2 Process Step
2.5.2.1 Process Description: ARCEDIT
Create a file with the four quadrangle border
arcs and four corner tics for each 7.5' USGS
quadrangle in the study area. BUILD each
coverage and assign ARCVALUE, DECQUAD, APAQUAD,
and appropriate arc User-IDs.
2.5.2.2 Source Used Citation Abbreviation: NFLSQUAD
2.5.2.3 Process Date:
2.5.2.4 Process Time:
2.5.2.5 Source Produced Citation Abbreviation: QD
2.5.2.6 Process Contact:
2.5.2 Process Steps for Manually Digitized Wetland
Quadrangle Files (29 7.5' USGS quadrangle-based coverages):
2.5.2 Process Step
2.5.2.1 Process Description: ARCEDIT
ADD wetland arcs into QD file for each
quadrangle.
2.5.2.2 Source Used Citation Abbreviation: QD
2.5.2.3 Process Date:
2.5.2.4 Process Time:
2.5.2.5 Source Produced Citation Abbreviation: WTLDIG
2.5.2.6 Process Contact:
2.5.2 Process Step
2.5.2.1 Process Description: CLEAN WTLDIG WTLCLN 0.00
1.219
Clean digitized wetlands file, calculate all
arc User-IDs to a value of 6. BUILD coverage.
2.5.2.2 Source Used Citation Abbreviation: WTLDIG
2.5.2.3 Process Date:
2.5.2.4 Process Time:
2.5.2.5 Source Produced Citation Abbreviation: WTLCLN
2.5.2.6 Process Contact:
2.5.2 Process Step
2.5.2.1 Process Description: CLIP WTLCLN QD WTLFILED
NET
Clip manually digitized wetland arcs with
quadrangle border. BUILD coverage.
2.5.2.2 Source Used Citation Abbreviation: WTLCLN
2.5.2.3 Process Date:
2.5.2.4 Process Time:
2.5.2.5 Source Produced Citation Abbreviation: WTLFILED
2.5.2.6 Process Contact:
2.5.2 Process Steps for Scanned Wetland Quadrangle Files (19
7.5' USGS quadrangle-based coverages):
2.5.2 Process Step
2.5.2.1 Process Description: IMPORT COVER SCANMAP
WTLMAP
Import scanned wetland file. Tics were scanned
as label points; reassign label locations as
tic locations using TABLES. Remove label
points, old tics, and BUILD coverage.
2.5.2.2 Source Used Citation Abbreviation:
2.5.2.3 Process Date:
2.5.2.4 Process Time:
2.5.2.5 Source Produced Citation Abbreviation: WTLMAP
2.5.2.6 Process Contact:
2.5.2 Process Step
2.5.2.1 Process Description: COPYCOV QD WTLTIC
Copy quadrangle file and create a tic-only file
(with UTM coordinates) from it. BUILD coverage.
2.5.2.2 Source Used Citation Abbreviation: QD
2.5.2.3 Process Date:
2.5.2.4 Process Time:
2.5.2.5 Source Produced Citation Abbreviation: WTLTIC
2.5.2.6 Process Contact:
2.5.2 Process Step
2.5.2.1 Process Description: TRANSFORM WTLMAP WTLTIC
2.5.2.2 Source Used Citation Abbreviation: WTLMAP,
WTLTIC
Transform scanned polygons into the empty tic
file.
2.5.2.3 Process Date:
2.5.2.4 Process Time:
2.5.2.5 Source Produced Citation Abbreviation: WTLTIC
2.5.2.6 Process Contact:
2.5.2 Process Step
2.5.2.1 Process Description: CLEAN WTLTIC WTLFILES 0.00
1.219
Clean scanned wetlands file, calculate all arc
User-IDs to a value of 6; BUILD coverage.
2.5.2.2 Source Used Citation Abbreviation: WTLTIC
2.5.2.3 Process Date:
2.5.2.4 Process Time:
2.5.2.5 Source Produced Citation Abbreviation: WTLFILES
2.5.2.6 Process Contact:
2.5.2 Process Steps for Study Area Border Quadrangles:
2.5.2 Process Step
2.5.2.1 Process Description: COPYCOV WSQUADS WSA
Edit WSA in ARCEDIT to retain only the outer
study area boundary (Oswegatchie/Black River
watershed and Adirondack Park boundary); BUILD
file.
2.5.2.2 Source Used Citation Abbreviation: WSQUADS
2.5.2.3 Process Date:
2.5.2.4 Process Time:
2.5.2.5 Source Produced Citation Abbreviation: WSA
2.5.2.6 Process Contact:
2.5.2 Process Step
2.5.2.1 Process Description: UNION WSA QD BOUND 0.00
Add outer study area boundary to 7.5'
quadrangle boundary. Delete extraneous arcs
(quadrangle borders outside of study area) to
create a clipping polygon. CREATELABELS and
BUILD.
2.5.2.2 Source Used Citation Abbreviation: WSA
2.5.2.3 Process Date:
2.5.2.4 Process Time:
2.5.2.5 Source Produced Citation Abbreviation: BOUND
2.5.2.6 Process Contact:
2.5.2 Process Step
2.5.2.1 Process Description: IDENTITY BOUND WTLFILED
WTLBOR POLY 0.00
or IDENTITY BOUND WTLFILES WTLBOR POLY 0.00
Add study area boundary to wetland file and
clip arcs to that border
2.5.2.2 Source Used Citation Abbreviation: BOUND,
WTLFILED or WTLFILES
2.5.2.3 Process Date:
2.5.2.4 Process Time:
2.5.2.5 Source Produced Citation Abbreviation: WTLBOR
2.5.2.6 Process Contact:
2.5.2 Process Step
2.5.2.1 Process Description: IDENTITY QD WTLBOR
WTL POLY 0.00
Add quadrangle boundary to WTLBOR to produce
final wetland polygon file, ready for wetland
label additions. Add appropriate label (arc
and polygon) columns.
2.5.2.2 Source Used Citation Abbreviation: WTLBOR, QD
2.5.2.3 Process Date:
2.5.2.4 Process Time:
2.5.2.5 Source Produced Citation Abbreviation: WTL
2.5.2.6 Process Contact:
2.5.2 Process Step All Quadrangles:
2.5.2 Process Step
2.5.2.1 Process Description: CREATELABELS WTLFILED
CREATELABELS WTLFILES
or CREATELABELS WTL
Create label point with unique User-ID for each
polygon. BUILD and check with LABELERRORS.
Double-check all polygons <500 square meters
for digitizing or scanning errors. Calculate
unique User-IDs for wetland arcs.
2.5.2.2 Source Used Citation Abbreviation: WTLFILED,
WTLFILES, or WTL
2.5.2.3 Process Date:
2.5.2.4 Process Time:
2.5.2.5 Source Produced Citation Abbreviation: WTLA
2.5.2.6 Process Contact:
2.5.2 Process Step
2.5.2.1 Process Description: ARCPLOT
Create hard copy of coverage showing label
points and arcs. Check against ORTHO-POLY. Use
this map for arc and polygon label entry.
2.5.2.2 Source Used Citation Abbreviation: WTLA
2.5.2.3 Process Date:
2.5.2.4 Process Time:
2.5.2.5 Source Produced Citation Abbreviation: WTLA-
edits
2.5.2.6 Process Contact:
2.5.2 Process Step
2.5.2.1 Process Description: ARCEDIT
Make map corrections. MOVEITEM using digitizer
menu to add wetland label components to arcs
and polygons. BUILD or CLEAN as appropriate.
2.5.2.2 Source Used Citation Abbreviation: WTLA-edits
2.5.2.3 Process Date:
2.5.2.4 Process Time:
2.5.2.5 Source Produced Citation Abbreviation: WTLB
2.5.2.6 Process Contact:
2.5.2 Process Step
2.5.2.1 Process Description: dBASE UPDATE
Concatenate SYSTEM, CLASS1, CLASS2, REGIME,
SPECIAL1, SPECIAL2, and SPECIAL3 into NWILABEL.
BUILD.
2.5.2.2 Source Used Citation Abbreviation: WTLB
2.5.2.3 Process Date:
2.5.2.4 Process Time:
2.5.2.5 Source Produced Citation Abbreviation: WTLC
2.5.2.6 Process Contact:
2.5.2 Process Step
2.5.2.1 Process Description: ARCPLOT
Create hard copy edit map showing arcs, linear
wetlands, and NWILABEL. Overlay with ORTHO-
LABEL, and if necessary, ORTHO-POLY. Make any
edit changes in ARCEDIT. BUILD or CLEAN.
2.5.2.2 Source Used Citation Abbreviation: WTLC
2.5.2.3 Process Date:
2.5.2.4 Process Time:
2.5.2.5 Source Produced Citation Abbreviation: WTLD
2.5.2.6 Process Contact:
2.5.2 Process Step
2.5.2.1 Process Description: EDGEMATCH
Edgematch arcs along adjoining quadrangles.
North and east quadrangle edges were held
constant. CLEAN.
2.5.2.2 Source Used Citation Abbreviation: WTLD
2.5.2.3 Process Date:
2.5.2.4 Process Time:
2.5.2.5 Source Produced Citation Abbreviation: WTLE
2.5.2.6 Process Contact:
2.5.2 Process Step
2.5.2.1 Process Description: ARCVIEW
Check that polygons and linear wetlands posses
the same NWILABEL along adjoining quadrangle
boundaries. Use ARCEDIT to correct and BUILD if
necessary.
2.5.2.2 Source Used Citation Abbreviation: WTLE
2.5.2.3 Process Date:
2.5.2.4 Process Time:
2.5.2.5 Source Produced Citation Abbreviation: WTLF
2.5.2.6 Process Contact:
2.5.2 Process Step
2.5.2.1 Process Description: DISSOLVE WTLF WTLCHK
NWILABEL
Use NWILABEL as the basis to DISSOLVE arcs with
the same wetland label on either side. Compare
WETLAND with WTLCHK. This quality control step
assures that adjacent polygons do not have the
same NWILABEL unless the arc splitting the
polygon is a labeled linear wetland.
2.5.2.2 Source Used Citation Abbreviation: WTLF
2.5.2.3 Process Date:
2.5.2.4 Process Time:
2.5.2.5 Source Produced Citation Abbreviation: WTLG
2.5.2.6 Process Contact:
2.5.2 Process Step
2.5.2.1 Process Description: ARCEDIT
Make corrections as noted in DISSOLVE. BUILD.
Follow list of final quality assurance/quality
control measures and make changes. BUILD or
CLEAN as needed.
2.5.2.2 Source Used Citation Abbreviation: WTLG
2.5.2.3 Process Date:
2.5.2.4 Process Time:
2.5.2.5 Source Produced Citation Abbreviation: WETLAND
2.5.2.6 Process Contact:
2.5.2 Process Step 2.5.2.1 Process Description: EXPORT COVER WETLAND WTLEXP N 5000 EXPORT WETLAND coverages and compress using PKZIP. Copy onto 9-track tape, (short records permitted, no translation of data, unformatted records (byte-to-byte transfer rather than by record), blocksize=2048) for transport to NYS Adirondack Park Agency. 2.5.2.2 Source Used Citation Abbreviation: WETLAND 2.5.2.3 Process Date: 2.5.2.4 Process Time: 2.5.2.5 Source Produced Citation Abbreviation: WTLEXP 2.5.2.6 Process Contact: 2.5.2 Process Step 2.5.2.1 Process Description: dd if=/def/rmt/1n of=wtl.zip ibs=2048 conv=unblock wetland files moved from 9-track tape to Unix hard drive. 2.5.2.2 Source Used Citation Abbreviation: WTLEXP 2.5.2.3 Process Date: 2.5.2.4 Process Time: 2.5.2.5 Source Produced Citation Abbreviation: WTL.ZIP 2.5.2.6 Process Contact:
2.5.2 Process Step
2.5.2.1 Process Description: ftp binary get wtl.zip bye
Bring WTL.ZIP from UNIX hard drive to PC harddrive. PKUNZIP
WTL.ZIP; EXIT.
2.5.2.2 Source Used Citation Abbreviation: WTL.ZIP
2.5.2.3 Process Date:
2.5.2.4 Process Time:
2.5.2.5 Source Produced Citation Abbreviation: WTLUNZ
2.5.2.6 Process Contact:
2.5.2 Process Step
2.5.2.1 Process Description: ftp ascii
prompt (turns echo off)
mput WTLUNZ (no capitals;
in place of WTLUNZ type wetland coverage
name.e*). Rename all files to lower case.
2.5.2.2 Source Used Citation Abbreviation: WTLUNZ
2.5.2.3 Process Date:
2.5.2.4 Process Time:
2.5.2.5 Source Produced Citation Abbreviation: wtl.e*
2.5.2.6 Process Contact:
2.5.2 Process Step
2.5.2.1 Process Description: IMPORT COVER {apa_quad_code}wtl
{apa_quad_code}wtl
Import coverage to UNIX Arc/Info at the Adirondack
Park Agency.
2.5.2.2 Source Used Citation Abbreviation: {apa_quad_code}wtl.e*
2.5.2.3 Process Date: 19950831 (19951018 for 3 missing quads)
2.5.2.4 Process Time: 09:00
2.5.2.5 Source Produced Citation Abbreviation: {apa_quad_code}wtl
2.5.2.6 Process Contact: John Barge, APA
2.5.2 Process Step
2.5.2.1 Process Description: PROJECTCOPY COVER e21seid COVER
{apa_quad_code}wtl
Store UTM zone 18 projection information with each
quad coverage.
2.5.2.2 Source Used Citation Abbreviation: /peat1/epa/ob1/qds/e21seid
2.5.2.3 Process Date: 19951017 (19951018 for 3 missing quads)
2.5.2.4 Process Time: 10:11
2.5.2.5 Source Produced Citation Abbreviation:
/peat1/epa/ob1/newwtl/{apa_quad_code}wtl
2.5.2.6 Process Contact: John Barge, APA
2.5.2 Process Step
2.5.2.1 Process Description:
PUTTILE {apa_quad_code}wtl {apa_quad_code} wtl ALL
Put wetland quad coverages into Arc/Info LIBRARY OB_LIB,
in library layer WTL. This library is based on the
7.5 minute quadrangle index coverage.
2.5.2.2 Source Used Citation Abbreviation: {apa_quad_code}wtl
2.5.2.3 Process Date: 19951017 (19951018 for 3 missing quads)
2.5.2.4 Process Time: 10:30
2.5.2.5 Source Produced Citation Abbreviation: LIBRARY layer WTL
LIBRARY tiles {apa_quad_code}
2.5.2.6 Process Contact: John Barge, APA
2.5.2 Process Step
2.5.2.1 Process Description: Arc/Info macro SETSNAP.AML for
quad covers that failed PUTTILE due to
boundary not fitting within the TILE extent.
/* setsnap.aml /* John W. Barge 10/17/95
/* Use this to snap coverage neatlines to a master quad index /* coverage. If the coverage is single precision, it's better /* to snap to a single precision index coverage. /* Things to note: /* Nodesnap and snapping tolerances should be the same. /* Keep weedtolerance very low. /* IntersectArcs MUST be off to avoid having existing arcs /* split into new arcs. /* Procedure: /* Start Arcedit, establish your edit coverage and your edit feature. /* Select all arcs. /* Run this macro to set up the environment. /* Snap nodes to snap cover neatline arcs. /* Select ONLY the neatline arcs. Note: lpoly# and rpoly# = 1 won't /* work at this point because polygon topology no longer exists. /* Add a temporary item or use the user-id and give the neatlines /* a unique value before the first snap (when poly topology exists) /* to aid in selecting all of them. /* Set SnapFeature to ARC ARC. /* Snap the neatline arcs to the snap cover arcs. /* There should be no additional arcs, and no arcs deleted. /* Check that the number of arcs snapped equals the number of /* neatline arcs selected. If there are fewer arcs snapped, /* it's probably because the snapping tolerance is too low. /* Reselect internal# greater than 0 (snapped arcs get reset to 0) /* Reset the mapextent to the selected set, clear display, /* drawselect, then zoom it to the problem areas. Measure the /* distance to determine a new snapping tolerance. Aselect /* connected arcs, set snapfeature to 'node arc' or 'arc arc' /* depending on what seems to be beyond the original tolerance. /* Then snap the selected set and re-check the areas. /* Save the changes. &s snapcov /peat1/epa/ob1/qds/obquadssingle de arc de node errors nodecolor dangle 6 bc %snapcov% 2 be arc sc %snapcov% sf node arc snapping closest 1.22 nodesnap closest 1.22 intersectarcs off weedtol 1 grain .3 &return /* End of AML 2.5.2.2 Source Used Citation Abbreviation: d21nwwtl and d21swwtl 2.5.2.3 Process Date: 19951017 2.5.2.4 Process Time: 16:00 2.5.2.5 Source Produced Citation Abbreviation: d21nwwtl and d21swwtl 2.5.2.6 Process Contact: John Barge, APA
2.6 Cloud Cover: None