Hubbard Brook LTER Site Digital Data


DATA LAYER SUMMARY

Coverage:  hbcont10
Data Layer:   10 foot contours
Feature Type:  line


DATA SOURCE

Map Date:  May, 1956
Map Scale:  1;7,920
Media:  Mylar/Paper Diazo Copy

Description:  Diazo copy of Hubbard Brook Watershed Map generated stereophoto- 
grammetrically based on May, 1956 aerial photography.  Shows New Hampshire state 
plane coordinate system reference points which were projected into UTM Zone 19 
and used as reference tics.  The contour lines were manually digitized from the map.


DATA FORMAT

Software: ARC Version 7.0.4 (ESRI, Inc.)
Projection:  UTM Zone 19


ACCURACY

Feature Accuracy:  The lines were digitized on a Calcomp 9500 series plotter set 
at 1000 ppi and registered with an RMS <= .003.  


DATA DEVELOPMENT

Date Created:  Unkown
Original Projection:  NH State Plane
Last updated:  Unknown

NOTES

The arc attribute table (hbcont10.aat) contains the item CI which stands for contour interval.  This enables the user to select 10 or 50 foot contour intervals.  The coverage hbcont50 contains only the 50 foot contours.

DETAILED DESCRIPTION

                                FEATURE CLASSES

                                    Number of  Attribute     Spatial
Feature Class          Subclass     Features   data (bytes)  Index?   Topology?
-------------          --------     ---------  ------------  -------  ---------
ARCS                                     3955        38
NODES                                   56384

                               SECONDARY FEATURES

Tics                                       45
Arc Segments                           887903
Links                                     300

                                   TOLERANCES

Fuzzy   =                 0.994 N          Dangle  =                 0.000 N

                               COVERAGE BOUNDARY

Xmin =               274827.438            Xmax =               284764.531
Ymin =              4865689.000            Ymax =              4871238.500

                                     STATUS

The coverage has not been Edited since the last BUILD or CLEAN.

                          COORDINATE SYSTEM DESCRIPTION

Projection                  UTM
Zone                         19
Datum                     NAD27
Units                    METERS             Spheroid             CLARKE1866
Parameters:

ITEMS HBCONT10.AAT

COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME     INDEXED?
    1  FNODE#                 4     5     B      -                        -
    5  TNODE#                 4     5     B      -                        -
    9  LPOLY#                 4     5     B      -                        -
   13  RPOLY#                 4     5     B      -                        -
   17  LENGTH                 4    12     F      3                        -
   21  HBCONT10#              4     5     B      -                        -
   25  HBCONT10-ID            4     5     B      -                        -
   29  ELEV                   5     5     I      -                        -
   34  CI                     2     2     I      -                        -
   36  SYMBOL                 3     3     I      -                        -

Record   elev ci symbol
     1   3200 50   2
     2   3150 50   2
     3   3100 50   2
etc...
   121   1260 10   3
   122   1260 10   3
   123   1290 10   3
etc...