Topic: Abundance measures in MR - Numbers per square Metre
Does anybody else collect data as numbers of individuals per square metre?
SNH have recently received data from a contractor who has recorded some data as numbers of individuals per square metre. Speaking with our survey team it is clear that they forsee we may have further such data in the future.
According to the manual (printed page 77, digital page 78) and the MR interface the only permissable abundance measures are SACFORN, Present/ Not present, Percentage, Score (0-5) & Count. In theory it is not therefore possible to enter Number per square metre data to MR.
When they have entered the data they have chosen to put the number per square metre values into MR as if they were Count values; I don't think that is the correct thing to do [and I suspect it is at least partly (due to presence of decimal values in Count field) the cause of an export to the NBN Gateway failing]. I'd suggest that the appropriate action would have been to convert the number per square metre to a SACFOR value as per the MNCR Rationale & Methods; though clearly this looses information.
I'm slightly confused as the MR snapshot seems to have a Number per square metre field but there is no documentation to describe how this is populated; I assume it is a field calculated when a device area is also recorded, as not all count values in the snapshot have a Number per square metre value?