Hubbard Brook LTER Site Digital Data


DATA LAYER SUMMARY

Coverage:  hbcont50
Data Layer:   50 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 coverage hbcont50 contains the 50 foot contour lines select from the hbcont10 coverage.

DETAILED DESCRIPTION

                                FEATURE CLASSES

                                    Number of  Attribute     Spatial
Feature Class          Subclass     Features   data (bytes)  Index?   Topology?
-------------          --------     ---------  ------------  -------  ---------
ARCS                                      327        38
NODES                                   56381

                               SECONDARY FEATURES

Tics                                       45
Arc Segments                            81896
Links                                     300

                                   TOLERANCES

Fuzzy   =                 0.994 N          Dangle  =                 0.000 N

                               COVERAGE BOUNDARY

Xmin =               274835.594            Xmax =               284758.500
Continue? 
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 HBCONT50.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  HBCONT50#              4     5     B      -                        -
   25  HBCONT50-ID            4     5     B      -                        -
   29  ELEV                   5     5     I      -                        -
   34  CI                     2     2     I      -                        -
   36  SYMBOL                 3     3     I      -                        -

Record  CI SYMBOL
     1  50   2
     2  50   2
     3  50   2
     4  50   2
  etc...