Photo’s are very helpful when observations must be linked with correct nest-ID’s. Determine the correct nest-ID’s is essential for a good monitoring programme.

The photo above was taken in January 2010 from nest 229 at Zaarderheiken. While entering the dimentions in the database and checking it’s exact location in Google Earth it was clear that there was a mixup somewhere. The photo below shows also nest 229, but tho years earlier. It is clear that these photo’s do not show the same nest, but these photo’s were taken just a few meters from each other. A difficult task is to determine what observation was linked to the wrong nest-ID. Ro maybe it is a completely nes nest.

Since 2009 GPS is used in the field. This tool should help preventing mixups like this one in the future.
Read more about data integrity