QUOTE(dragon's nest @ Jul 14 2010, 09:35 AM)
Thank you very much, tuckfook and west wing for your answers.
I want to report the result. My birdhouse has window-type entrance with metal spikes installed and I've installed the mercurial vapor floodlight yesterday and the result is : failure. The spikes can prevent only pigeons. The owl did NOT have to perch on anything, it just glided through the entrance, into the roving room, then to the nesting room, tried to grab the birds from their nests, scared them and chased them to the roving room and caught them there and, out , it went. So, the myths about perching before entering, the fear of bright light, the formidable electric zapper are just myths. Also, it did not fly low. It can go to the ceiling for the birds in their nests. So, now our options are fishing net on the entrance after it went in (in this case our own birds are also at risk, and we have to be careful not to fall down too), or the automatic gate. Does anybody have other methods? Thank you.
With any problem, there is a solution, provided you consider all the aspects that that surround the problem. They are not myths ! Each problem has a general and also unique solution. Myths are things we fail to understand.
You did not give full details in the first place.
Remember, Owls are wise ! in many cases wiser than humans

remember, I mentioned they learn ! and fast.
Spikes did not work because it has been attacking the place for a long time and learnt to avoid them without having the need to perch on the entrance hole before entering.
Lights did not work because they are on all the time and only HELPS them to see better.
The owl did not need to perch because it already has a perch nearby, from which to launch it's attack.
There are in general 2 types of common owls, a larger and a smaller specie. The smaller specie can fly up to the nest and hover and fly off without going very low, near the floor.
Since yours is an old problem, the horizontal bars across the in/out hole is the best best.
Remove all places where the birds can perch within 50 metres. eg. tall trees etc.
Use flourescent lights for general lighting and spot light connected to infra red sensors at the entry hole. In case you don't realise, the sudden light that comes on when the bird approaches will deter the bird.
Otherwise pay a specialist to get rid of the problem once and for all. No solution no pay.
Added on July 14, 2010, 2:46 pmQUOTE(Cergau @ Jul 14 2010, 01:08 PM)
To quote the Malay Mail report by the Minister
"The DVS will provide each swiftlet farm with a Radio Frequency Indentification (RFID) to assist in identifying the location of the farms which are required to be far from residential areas."
LOL,
I was wondering how they manage to jump from RFID to GPS!!!!
Now it's clearer. They will go visit your farm and take the GPS coordinates.
And how are they to decide if that particular location is far enough from residential dwellings?
Even JUPEM (Jabatan Ukur) doesnt have ready to use s'ware to identify that right away.
I hope they are not thinking of using Google Earth for the purpose.
1)GoogleEarth satellite shots are a few years old.
2)Also a lot of shots are 10-200 meters out of the real coordinates.
Try it out yourself.
Find a location near you in Google Earth under high resolution.
Go there physically and take the GPS cood.
Then enter the cood into Google Earth...you will find that you are tens to hundreds of metres OFF.
Malaysia Survey maps uses a different Datum to Google Earth /Maps.. Google maps does not have the accuracy of JUPEM survey maps/plans which are sub cm. accurate depending on scale.
GPS usually uses a datum WGS84 whereas Malaysia uses Kertau. Without going into details, there are differences when we compare older land plans to current GPS readings.
Jabatan Ukur has updated Kertau based plans to GPS ready coordinates for most urban areas. CDs of these updated plans are available, in GPS/ WGS84 though not for the whole of Malaysia. Many surveyors now use GPS for surveying in Malaysia but they use a different receiver that can be very accurate. Civilian GPS receivers are good to about 10 m radius.
Several years ago, US imposed a random 30m+ offset on all gps signals so that other military could not use the signals. Now, with military GPS they can put a cruise missile into birdhouse entry hole, so the offset is said to be no longer there.
If all residential areas have approved plans then it will be easy to identify where each location is in relation to these areas.
DVS wants to identify every BH in Malaysia. The obvious reason is CONTROL. The RFID ideas was brought up many years ago but it was never implemented for many other types of farming, eg, poultry, cattle etc. The obvious reason is diseases control, which is under their purview. So all they do is scan the RFID and they know where it comes from. It is an identity tag. Just like the IC number.
We know we can always put somebody elses tag on our produce, if need be.
GPS just helps the officers when they need to visit the site, with current GPS route planners. There will be no need for long, complicating rural addresses. It will also help other government agencies to identify the farms, eg. IRS.
This post has been edited by tuckfook: Jul 14 2010, 02:46 PM