Secondary drainage region land cover

Resource Quality Services

South Africa: PDF files of South African landcover from the CSIR ARC national 1:250 000 land cover data set segmented by secondary drainage region.
2003-08-25 09:09 draft 3
Please choose a secondary drainage from the list below, or try this slick graphical interface by GeoWise (UK).
A1 A2 A3 A4 A5 A6 A7 A8 A9
B1 B2 B3 B4 B5 B6 B7 B8 B9
C1 C2 C3 C4 C5 C6 C7 C8 C9
D1 D2 D3 D4 D5 D6 D7 D8
E1 E2 E3 E4
F1 F2 F3 F4 F5 F6
G1 G2 G3 G4 G5
H1 H2 H3 H4 H5 H6 H7 H8 H9
J1 J2 J3 J4
K1 K2 K3 K4 K5 K6 K7 K8 K9
L1 L2 L3 L4 L5 L6 L7 L8 L9
M1 M2 M3
N1 N2 N3 N4
P1 P2 P3 P4
Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q8 Q9
R1 R2 R3 R4 R5
S1 S2 S3 S4 S5 S6 S7
T1 T2 T3 T4 T5 T6 T7 T8 T9
U1 U2 U3 U4 U5 U6 U7 U8
V1 V2 V3 V4 V5 V6 V7
W1 W2 W3 W4 W5 W6 W7
X1 X2 X3 X4

Segmenting land cover by drainage region

The Department of Water and Sanitation was part of the consortium that funded theNational Land Cover project, and therefore has a copy of the GIS coverage of land cover ( Fairbanks et al., 2000). An INTERSECT operation on the land cover coverage and quaternary drainage region coverage in Arc/Info yielded a new coverage containing land cover information "cookie-cut" to drainage region borders. The data table associated with the combined coverage is easily converted to a comma-delimited format readable by other programs, not only ArcView but also other programs, such as spreadsheet packages.

Note that scale differences between the two coverages can cause edgematch errors of 100 metres or more. One consequence is that many of the coastal quaternary drainage regions include slivers of marine water.

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