Search result for:  id10=WA 0812 2782 5310 [[Pandawa Karpet]] Ahli Karpet Masjid Roll Profesional Jatisrono Wonogiri

@ahmed_ramadan_geo Regarding your questions: 1. It removes the maneuver effect due to the swing of the sensor as well. 2. There are really NO best way to do the compensation flight. There are two main requirements for a compensation flight: 1. Include as much Roll/pitch/yaw motions as possible. 2. Avoid magnetic gradient. If you can fly the drone very high (>100m) over a low gradient area, a cloverleaf pattern is probably the best (as in traditional airborne surveys in which you can fly high to avoid the local gradient.). But this pattern is hard to fly, especially over a small area. 360-degree turn is simple and almost guaranteed to have no magnetic gradient in the compensation data since it is over the same location. If the MagArrow doesn't have much pitch and Roll motion, 360-deg turn is sufficient. But it doesn't compensate well for pitch and Roll maneuver noise (no much pitch/roll calibration). A survey pattern is between the two patterns described above. You may be able to use it, instead of doing a calibration flight. You can use the calibration file generation module to process the cloverleaf pattern. 3. Since the calibration flight is typically short, a base-station may not be necessary. Diurnal field change is usually not significant in a minute. 4. As I mentioned in 1., maneuver correction is also applied here. You can also use LP filter but make sure NOT to apply the heading compensation after the LP filter.

A mechanical Roll switch is not needed. You can use the electronic Roll capability built in to the Geode acquisition software.

Hello Dear Rui, I have questions regarding MagArrow Magnetic data compensation, if you can answer please, 1- Does the heading error compensation that applied by surveying data processing program remove the heading effect due to direction only or calibrates the maneuver effect due to the swinging of the sensor as well? 2- Regarding the heading compensation flight, I am confused about the best way to do this. In the manual, it is mentioned that we can apply a cloverleaf pattern (this is usually used in airborne survey) or a survey pattern or we can do a 360 degree turn at a certain point. However, it is written that we can use the calibration data measured in the turn, can I use the data from the turn to apply the heading error correction separately for each flight instead of doing a heading flight. Regarding the cloverleaf pattern application, is the data also processed in the same way using surveying data processing program? 3-What is the importance of the base station magnetometer data in this correction as mentioned in the manual, I think we can apply it without base magnetometer? 4- Finally, is there a specific flight that can be done to make maneuver correction (FOM) (roll, pitch and yaw) that we apply in conventional magnetic airborne survey? or We just resort to the LP filter. Sorry for the long post Kind Regards, Ahmed

The de facto "standard" for high-resolution reflection is 40-Hz geophones. The 40-Hz cutoff will filter out much of the ground Roll, allowing you to use the maximum gain even at near offsets, and taking advantage of the full dynamic range of the recording system.

There is no one right answer to this question. The higher the channel count, the higher the fold (for any given shot interval), and the higher the signal/noise ratio. For land seismic, we generally recommend 24 or higher-fold data. If the shot spacing is equal to the geophone spacing (typical), this means that you must record on at least 48 channels with each shot. In addition, you must have extra channels for electronic Rolling. Taken together, this means that for land CDP reflection, you should have a minimum of 72 channels, which will allow you to Roll 48 live channels through a total of 72.