Jökull - 31.12.2001, Blaðsíða 9

Geomorphology ofÓdáðahraun
a. LAVA COVER
a1. Fresh and glassy lava, mainly aa (0.3 %)
a2. Fresh and glassy lava (mainly pahoehoe), or
dark sand (1.2%)
a3. Smooth lava, partial clinker cover
with sparse vegetation (6.7%)
a4. Rough lava with partial sand cover
without vegetation (10.6%)
a5. Rough lava with partial vegetation cover(10.4%)
a6. Degraded lava, mainly aa, with little vegetation (2.4%)
b. BARREN SEDIMENT COVER
b1. Lag surface (polished cobbles, erosional) (7.2%)
b2. Reclaimed erosion area with dry grass (0.9%)
b3. Fine sediments (sand, mainly aeolian) (4.5%)
b4. Medium sediments (sand and gravel) (6,4%)
b5. Coarse sediments (mixed sand, gravel, cobbles
and boulders) (6.7%)
b6. Alluvial sediments or mixed sedim./lava (7.6%)
b7. Siliceous tephra (Askja) (1.7%)
b8. Siliceous tephra mixed with aeolian
sand (4.5%)
b9. Hyaloclastite formations or loose
palagonitised sediments (5.9%)
c. MISCELLANEOUS
c1. Hydrothermal alteration or
loose palagonitised sediment (0.4%)
c2. Vegetated soils (20.1%)
c3. Water bodies (2.0%)
c4. Snow or ice (0.6%)
Figure 3. Classified satellite image with the nomenclature and relative proportions of the 19 land cover classes
formed in the Isodata unsupervised classification. a) Various types of lava cover with six classes; b) Barren
sediment cover types with nine classes, and c) Miscellaneous land cover types with four classes (see text for
further details). -Flokkuð gervitunglamynd afsvœðinu norðan Vatnajökuls. Sjá texta á bls. 8.
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