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Habitat Degradation Value from InVEST 2.6.0 - Habitat Quality

aekkapolaekkapol Member
edited March 2014 in Terrestrial Models
Is a habitat degradation score of 0.1 reasonable for a large basin of 600,000 sq.km (with extensive landscape change)?

What values are other seeing?

Please see below information for your reference.

Data sources and methods for testing InVEST - Habitat Quality: Biodiversity model

All maps were created using ArcGIS version 10.1 (ESRI, 2011)
The InVEST standalone version 2.6.0 was tested.

Land use land cover map:
We obtained a Land Use Land Cover (LULC) data of Lower Mekong Basin parts in Cambodia, Laos, Thailand, and Vietnam for the year 2003 from Mekong River Commission (MRC). These data were classified from satellite imagery with field verification, as undertaken by individual countries. It contained 19 LULC classes (LULC codes 1 – 19 in Table 2). For biodiversity model, the road network dataset obtained from MRC was rasterized and merged into LULC2003 map (LULC codes 20-22 in Table 2). The spatial resolution of LULC map is 1 km x 1km.

Comments

  • LisaLisa Member
    Hi aekkapol,

    Seeing habitat degradation scores of 0.1 is certainly plausible, depending on the habitat sensitivities, threat weights and the maximum threat distances used in your particular case.

    However, there is also a known issue with the current implementation of the distance-decay function. In the current release of the model (and in the release you are using), threats are decaying more rapidly than specified by the exponential decay function, leading to lower degradation scores than expected given the inputs. Our software team is working on fixing this issue right now and will update the forum when this issue is fixed -- which should be quite soon!

    Thanks for your patience and please let me know if you have any additional questions,
    Lisa
  • Hi Lisa,

    Thank you very much for your help. I will be looking forward to the new version.

    Aekkapol
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