Ratiometric dating

Those radimetric dating techniques have been invaluable in a recent study.Here researchers showed that Zircons can form in the upper mantle and persist there for millions of years before entering the Earth's crust through volcanic processes.While the arrangement of pixels describes the spatial structure of an image, the radiometric characteristics describe the actual information content in an image.Every time an image is acquired on film or by a sensor, its sensitivity to the magnitude of the electromagnetic energy determines the radiometric resolution. The illustration on the left shows the image presented in two bits, or 4 shades of grey.Conversely, coarser spatial resolution would allow improved radiometric and/or spectral resolution.Thus, these three types of resolution must be balanced against the desired capabilities and objectives of the sensor.

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A very useful property of Zircons is their ability to accept high-field-strength elements.

Image data are generally displayed in a range of grey tones, with black representing a digital number of 0 and white representing the maximum value (for example, 255 in 8-bit data).

By comparing a 2-bit image with an 8-bit image, we can see that there is a large difference in the level of detail discernible depending on their radiometric resolutions.

Imagery data are represented by positive digital numbers which vary from 0 to (one less than) a selected power of 2. The maximum number of brightness levels available depends on the number of bits used in representing the energy recorded.

This range corresponds to the number of bits used for coding numbers in binary format. Thus, if a sensor used 8 bits to record the data, there would be 28=256 digital values available, ranging from 0 to 255.

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