Abstract:
Vegetation mapping of protected areas is a cornerstone of conservation worldwide.
Established in 1928 and covering over 1.4 million hectares, Hwange National Park (HNP) is
the largest natural reserve in Zimbabwe. In 1993, the sole comprehensive map of its vegetation
to date was produced and since then it has been used in numerous research and conservation
endeavours. Over the last two decades, however, the park’s vegetation changed, safari areas
and forest reserves were created at its edge and high-positional accuracy data on a suite of
species were collected. To tend to contemporary mapping needs, in this article, we present the
2013–2014 vegetation structure map of HNP and its surroundings. It was produced by
supervised classification of Landsat-8 Operational Land Imager (OLI) images, indices derived
from these and the Landsat Tree Cover Continuous Field product. Its accuracy was assessed
statistically using samples collected from high-resolution satellite imagery and basic ancillary
field data. Of its total pixels, 83.2% were correctly classified. Mean omission and commission
error were, respectively, 0.82 (0.74–0.90) and 0.82 (0.72–0.89), and this similarity held on a per
class basis, indicating reliable area estimates. It was produced using only freely available
imagery and software.
Conservation implications: In addition to providing researchers and conservationists
working within and around HNP with an updated vegetation map, aiming at an even broader
audience, we provide a step-by-step approach for using modern freely available imagery and
software for cost-effectively mapping HNP in future or other protected savannas across
Africa.
