Im part of a group conducting a aero magnetic survey. I was wondering which magnetometer would work at long distances(1000 m) and is able to connect to an Arduino uno. Thanks
Long distance from what?
1000 m of wire from the magnetometer to the Arduino is out of the question.
Distance from the ground. The Arduino will be in the air and the magnetometer will be pointed towards the ground
A magnetometer measures the local magnetic field, which can be influenced by ferrous materials in the ground some distance away.
Yes that's actually what I want. I want to make a map of magnetic anamolies like this one.
It would need to be in the air though so that is why I'm looking for one that can work at long distances.
I think you will need a professional grade instrument for that. It is my understanding that consumer grade MEMS magnetometers are too noisy.
Can you elaborate on the "noisy" part?
The internal sensor noise can drown out the very weak signals you want to measure.
Noise is part of the sensor specification, and typical noise figures are presented in the manufacturer's data sheet for the part.
So can you recommend a low noise magnetometer?
Hi,
You will need to consult with suppliers of commercial/industrial grade sensors I would think.
You also need to research what levels of flux you will be measuring (RANGE) and what magnitude the change in flux you need to be able to detect (PRECISION).
The map you have posted does not show a scale of flux values, so we cannot see what quality of data you require.
Tom.... 
Can you provide the names of any suppliers?
Hi,
magnetometer geophysics
Tom...
Talk to these people:
How would I connect it to an Arduino uno?
hI,
That is where your research is needed, the devices would have various communication methods.
Arduino can handle RS232, SPI, I2C and analog in basic form, but you must investigate each unit to see if it is compatible?
Tom...
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