Catchments of South Africa - quaternary
hca_quater
Institute for Water Quality Studies metadata.
Summary created by Elna with catalog.aml on 1999-04-01 - 14:34:42
File owner: elna, last modified: 1 Apr (less than 1yr ago)
Map extent:
| -812452W | . | 957182E |
| -2319445S | - |  | - | -2319445S |
| -3887253S | . | . | . | -3887253S |
| -812452W | . | 957182E |
Projection information (see end of this page for details)
Projection ALBERS
latitude of projection's origin 0 0 0.000
Units METERS Spheroid CLARKE1880
Scale
1000000
Date
1990
Description
Catchments of South Africa - quaternary
Owner
Water Research Commission
Owner_address
Water Research Commission
PO Box 824
PRETORIA
0001
Owner_contact
Hugo Maaren
Owner_country
South Africa
Owner_phone
(012) 330 0340
Owner_fax
(012)
Owner_email
hugo@wrc.ccwr.ac.za
Disclaimer
No responsibility for the accuracy of the data is accepted.
Copyright_message
Raw data from a variety of State and private sources
Copyright_warning
Data products may only be used for water research.
History
1996 - Water Research Commission report number 298/1/94
(DC Midgley, WV Pitman & BJ Middleton, Surface Water Resources of
South Africa 1990 - User's Manual - ISBN 1 86845 143 7)
1996 - CATNUM dropped, separate coverages for tertiary, secondary,
primary catchments created - Mike Silberbauer.
Some of the fields included as attributes:
CMAP Mean annual precipitation in mm
MAR Mean annual runoff in mm
MAR4Q Mean annual runoff in million cubic metres
MARnQ Mean annual runoff in million cubic metres at the n-ary level
Related lookup table: hca_q_mnth.lut
Mean monthly runoff in mm, from WR90:
COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME INDEXED?
1 QUATERNARY 4 4 C - -
5 Q_JAN 4 12 F 2 -
9 Q_FEB 4 12 F 2 -
13 Q_MAR 4 12 F 2 -
17 Q_APR 4 12 F 2 -
21 Q_MAY 4 12 F 2 -
25 Q_JUN 4 12 F 2 -
29 Q_JUL 4 12 F 2 -
33 Q_AUG 4 12 F 2 -
37 Q_SEP 4 12 F 2 -
41 Q_OCT 4 12 F 2 -
45 Q_NOV 4 12 F 2 -
49 Q_DEC 4 12 F 2 -
Logo
/hri/db/clip/wrc
Annotation items, 4kbyte:
12 Mar (less than 1yr ago), elna:
Polygon items, 190kbyte:
12 Mar (less than 1yr ago), elna:
23 data fields
| ITEM | EXAMPLES | WIDTH | TYPE | REDEFINED? | INDEXED? |
|---|
| AREA | 1764610048 | 4.3 | floatpnt | | |
| PERIMETER | 7036865 | 4.3 | floatpnt | | |
| HCA_QUATER# | 1 | 4.0 | binary | | |
| HCA_QUATER-ID | 1 | 4.0 | binary | | |
| QUATERNARY | A71L | 4 | character | | |
| CATID | 1 | 4.0 | binary | | |
| CMAP | 287.84 | 8.2 | numeric | | |
| MAR | 1.9 | 6.1 | numeric | | |
| CURVE | 6 | 3.0 | integer | | |
| HYDROZ | X | 1 | character | | |
| MAR4Q | 3.35 | 10.2 | numeric | | |
| TERTIARY | A71 | 3 | character | | |
| TERT-ID | 1 | 4.0 | binary | | |
| MAR3Q | 53.56 | 10.2 | numeric | | |
| SCND-ID | 1 | 4.0 | binary | | |
| SECONDARY | A7 | 2 | character | | |
| MAR2Q | 71.9 | 10.2 | numeric | | |
| PRIM-ID | 1 | 4.0 | binary | | |
| PRIMARY | A | 1 | character | | |
| MAR1Q | 2386.34 | 10.2 | numeric | | |
| QAT_LETTER | L | 1 | character | (ReDefined) | |
| TER_LETTER | 1 | 1 | character | (ReDefined) | |
| SEC_LETTER | 7 | 1 | character | (ReDefined) | |
Map specifications:
Description of SINGLE precision coverage /spek/waterm/wmdata/general/hca_quater
FEATURE CLASSES
Number of Attribute Spatial
Feature Class Subclass Features data (bytes) Index? Topology?
------------- -------- --------- ------------ ------- ---------
ARCS 6092
POLYGONS 1947 100 Yes
NODES 4147
ANNOTATIONS (blank) 25
SECONDARY FEATURES
Tics 124
Arc Segments 394128
Polygon Labels 1946
TOLERANCES
Fuzzy = 0.766 V Dangle = 0.000 N
COVERAGE BOUNDARY
Xmin = -732014.125 Xmax = 876744.312
Ymin = -3806815.250 Ymax = -2399882.500
STATUS
The coverage has not been Edited since the last BUILD or CLEAN.
COORDINATE SYSTEM DESCRIPTION
Projection ALBERS
Units METERS Spheroid CLARKE1880
Parameters:
1st standard parallel -18 0 0.000
2nd standard parallel -32 0 0.000
central meridian 24 0 0.000
latitude of projection's origin 0 0 0.000
false easting (meters) 0.00000
false northing (meters) 0.00000