Hubbard Brook LTER Site Digital Data


DATA LAYER SUMMARY

Coverage:  hydro
Data Layer:  Streams and ponds
Feature Type:  line, polygon


DATA SOURCE

Map Date:  May, 1956
Map Scale:  1;7,920
Media:  Mylar 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 streams, ponds, and lakes were manually digitized. 


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:  March 23, 1990
Original Projection:  NH State Plane
Last update:  March 28, 1990


DETAILED DESCRIPTIONS
 
                                 FEATURE CLASSES

                                    Number of  Attribute     Spatial
Feature Class          Subclass     Features   data (bytes)  Index?   Topology?
-------------          --------     ---------  ------------  -------  ---------
ARCS                                      172        28
POLYGONS                                    4        16               Yes
NODES                                     173
ANNOTATIONS             (blank)            25

                               SECONDARY FEATURES

Tics                                       45
Arc Segments                             7198

                                   TOLERANCES

Fuzzy   =                 0.521 V          Dangle  =                 0.000 V

                               COVERAGE BOUNDARY

Xmin =               275460.250            Xmax =               284494.125
Ymin =              4866644.500            Ymax =              4870769.000

                                     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 HYDRO.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  HYDRO#                 4     5     B      -                        -
   25  HYDRO-ID               4     5     B      -                        -

ITEMS HYDRO.PAT

COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME     INDEXED?
    1  AREA                   4    12     F      3                        -
    5  PERIMETER              4    12     F      3                        -
    9  HYDRO#                 4     5     B      -                        -
   13  HYDRO-ID               4     5     B      -                        -

Note: HYDRO-ID stores stream order (1-5 = First - Fifth order).  Watershed boundary identify with HYDRO-I = 100.  LINE-COL stores line color value and SYMBOL stores line symbol for display purposes.

ITEMS HYDRO.LUT
 
 COL  ITEM NAME         WDTH OPUT TYP N.DEC  ALTERNATE NAME
    1  HYDRO-ID            3    3  I    -
    4  LINE-COL            3    3  I    -
    7  SYMBOL              3    3  I    -
   10  LABEL              20   20  C    -

$RECNO   HYDRO-ID LINE-COL SYMBOL LABEL
      1     1        1       77    FIRST ORDER
      2     2        1       81    SECOND ORDER
      3     3        1       21    THIRD ORDER
      4     4        1       25    FOURTH ORDER
      5     5        1        9    FIFTH ORDER
      6   100       10       10    WATERSHED BOUNDARY