Hubbard Brook LTER Site Digital Data


DATA LAYER SUMMARY

Coverage:  benchmrk
Data Layer:  Benchmark locations at Hubbard Brook
Feature Type:  point


DATA SOURCE

Map Date:  August 28, 1995
Map Scale:  1;12000
Media:  Digital

Description:  This coverage was obtained in digital form from Christ Barton of 
the USGS.  Bedrock geology in the Hubbard Brook Valley was mapped by C.C. 
Barton, R.H. Comerlo, and S.W. Bailey, August 1994 to August 1995.  The Map is 
entitled "BEDROCK GEOLOGIC MAP OF HUBBARD BROOK EXPERIMENTAL FOREST AND MAPS OF 
FRACTURES AND GEOLOGY IN ROADCUTS ALONG INTERSTATE 93, GRAFTON COUNTY, NEW 
HAMPSHIRE" and was approved for publication on August 28, 1995.  


DATA FORMAT

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


ACCURACY

Feature Accuracy:  Unknown  


DATA DEVELOPMENT

Date Created:  August 28, 1995
Original Projection:  UTM Zone 19
Last updated:  August 28, 1995


NOTES

Only one of the benchmarks in this coverage are visible.  The benchmark was set 
by the New Hampshire Department of Transportation in 1993 and is adjacent to the 
Hubbard Brook Headquarters building.  The station is a standard NHDOT disk 
stamped "Hubbard Brook 1993", set into the top of a 4 FT long by 5 IN granite 
monument flush with the ground and level with the parking lot.  Located 17.5 FT 
(5.3 M) southeast from the southeast corner post for a fence and the orange 
carsonite marker, 49.5 FT (15.1 M) northeast from the north corner of the office 
building, 60 FT (18.3 M) east from the west face of the concrete curb, 51.0 FT 
(15.5 M) south from the northeast corner post for a fence.

Benchmark location:

NAD83
Latitude = 43 56 38.0361
Longitude = 71 42 03.9897
Northing = 160408.164 Meters
Easting = 297235.062 Meters

NAD27
Latitude = 43 56 37.7891
Longitude = 71 42 05.7012
Northing = 526,241.45 Feet (State Plane Zone 4676)
Easting = 490,803.21 Feet

Elevation = 833.87 Feet NGVD29 (El order 31)


DETAILED DESCRIPTION

                                FEATURE CLASSES

                                    Number of  Attribute     Spatial
Feature Class          Subclass     Features   data (bytes)  Index?   Topology?
-------------          --------     ---------  ------------  -------  ---------
POINTS                                      3        22

                               SECONDARY FEATURES

Tics                                        4

                                   TOLERANCES

Fuzzy   =                 1.050 N          Dangle  =                 0.000 N

                               COVERAGE BOUNDARY

Xmin =               283189.375            Xmax =               284304.812
Ymin =              4868694.500            Ymax =              4868966.500

                                     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 BENCHMRK.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  BENCHMRK#              4     5     B      -                        -
   13  BENCHMRK-ID            4     5     B      -                        -
   17  VISIBLE                1     1     C      -                        -

Record  visible marker

     1  F       G-93
     2  F       G-86
     3  T