Is there a way to include (in queries etc) only the parts of a patrol that are within a certain area? I know you can filter out patrols that are entirely outside of a certain area, but that still includes patrols which are partly outside of the area.
My objective is to analyse catch per unit effort and area coverage, but only within the CA, thus excluding the sections of patrols (and the observations) that take place outside of the CA. To be clear, I do want to include the parts of those patrols that occur within the area.
Hi Lili, thank you for your response. That is a very useful document. Though, it does not exactly answer the question that I had.
In our conservation area, there is a number of patrols that have a significant part of their track outside of the CA, i.e. the monitors start their patrols before they actually enter the CA. I would like to exclude these sections from my analyses. The document in the post you shared clearly mentioned that that is not possible with their method. So, is there another way to exclude the sections outside the CA from the calculations? Thanks again.
Hi @RickvdM, hope you are well! I could be mistaken but to my knowledge there is not a feature in SMART that will allow you to crop your patrol trajectories by a boundary in this manner, which could necessitate the use of additional software (QGIS, R) to properly incorporate into an analysis. In general, if a patrol passes through a given spatial area and a spatial query is conducted, the full patrol is considered/returned. Theoretically if you wanted to consider only a particular segment of your patrol I believe you could edit it directly, but that’s a very manual and unideal approach (I also wouldn’t recommend impacting your original data this way by any means - would only do so on an exported and reimported ‘copy’). If any other SMART specialists know a method within SMART to accomplish this, please chime in!
This is a very reasonable use-case however, so would be well-worth submitting a request for inclusion in future updates of SMART. To the technical staff - has this or a similar request been raised in the past?
Hi,
In SMART 7.5.10, you can try the patrol request based on areas as in this screenshot (I rounded with red the option, my apologies for the French language).
Regards,
Angelo
Thank you for your reply. In the meantime, I have indeed obtained the desired result using Arcgis. Still, I agree that it would be a useful function to add to SMART if it indeed does not exist.
You can use Patrol summary query to calculate CPUE inside of your conservation area by using Conservation area boundary or patrol sector or whatever your boundary.
