Do you think vegetation indices can be calculated on a toolkit primarily designed for landscape fragmentation. The toolkit accepts all shp files as input layers (Tool- ZonalMetrics-Toolbox).
I have used the toolbox to produce landscape fragmentation indices for my study area and am now attempting to calculate vegetation indices (NDVI/MTCI/EVI). The Class Area (CA), Number of patches per class (NPC), Zone Area (ZA), and Percentage of zone (PZONE) all return the value 0 whenever I attempt to perform the AREA metrics with 5000 hectare size of hexagons.
Multiple attempts have been made in both arcmap and arcgis Pro (link- https://github.com/ZGIS/ZonalMetrics-Toolbox).
For the zonal metrics calculations to treat the ndvi polygons as one CLASS I created a field with the value 1 so that all NDVI shp files contain that number. This attempt yielded a result of 0 as well.
Please let me know if you think it is possible to calculate the vegetation metrics on the 5000 hectare size hexagons.
Kind regards,
Sanjana
Sanjana Dutt
Hi ,
Yes, it is possible to calculate vegetation indices using the same method as fragmentation indices within zonal statistics. However, the specific toolkit you are using may have limitations in terms of its ability to calculate vegetation indices.
It is possible that the zero values you are getting for the area metrics with 5000 hectare size of hexagons may be due to the size of the hexagons being too large for the resolution of the vegetation index data. It may also be due to the method of assigning the value of 1 to all NDVI polygons, which may not be properly integrating with the zonal statistics calculations.
I would recommend trying a different tool or approach for calculating vegetation indices within the same GIS software that you are using. There may be other available tools or scripts that are more suitable for calculating vegetation indices at the scale and resolution of your data. such as :
Additionally, you can try to verify that the data you are using is properly formatted and that there are no errors in the input data or parameters used in the calculation.
Please recommenf my reply if you find it helpful . Thanks
Aahed
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