Hello,
I have a problem running the habitat quality model. An error occur which says: “Exception encountered: The datasets’ intersection is empty (i.e., not all the datasets touch each other)”. What does this mean? Does this have to do with the no-data values ?
thanks for helping!
Hi @elin -
When you post about an error, it is helpful if you attach the entire log file (.txt) that the model produces in the Workspace - that often provides more information to help us debug.
The error means that the model is trying to lay the spatial layers over each other, and at least one of them does not overlap any of the others, the spatial extents are too different. One possibility for this error is that not all of the spatial data is in the exact same projected coordinate system, so check for that first. If that is not the problem, we’ll see if the log file gives any clues.
~ Stacie
Hello Stacie,
thank you, you were right, that was the problem.
I would be thankful if you could answer a general question:
I am using the Habitat Quality tool to model the quality of an area which is only 1.7 square kilometer wide. Do you think that this relatively small area is a problem for modeling the habitat quality? In papers I have read, where the modeling tool is used, the area of interest is often several thousands of square kilometer.
I have produced some resulting quality raster maps. But despite the negative effect the threats should have on the area, it seems like the quality is very much better that it should be. Could it have something to do with the size of the area (for which the threats are not properly accounted for) ? Do you think this habitat quality modeling tool is suitable for such a small area of 1,7 square kilometer?
Thank you very much for your help!
Kind regards Diana
Hi @elin -
That does seem like a pretty small area to model, but I’d say it should be ok, if you have very fine-resolution information on the land cover and threats. What is the resolution of your input layers?
As for threats in particular, we do recommend making sure that your threat layer covers as large of an area as is necessary to include everything that might impact the area of interest. In such a small area, are you able to include all of the towns, agriculture, roads, or whatever else is a threat? As an example, if one of your threats is towns, and towns have an impact radius of 5km, you should be including towns that are up to 5km outside of your area of interest. Similar with roads etc.
~ Stacie
Hello Stacie,
thank you for your answer, your explanation helped a lot to understand.
The resolution of the input layers is 10x10 m per raster cell. Unfortunately the provided data I’m using may not include all of the threats within the impact radius.
One last question: Whats the common way to determine the threat parameters for a specific area (impact radius, sensitivity, weight) and the habitat suitability? Or could you maybe tell me how I can determine the parameters of the threats Town, Big Roads, Small Roads, and Unlegal Garbage Dump?
Thank you!
Diana