Sample intervals in Interval files

When you are entering sample intervals, remember the following.

The downhole depths of consecutive sample intervals must have increasing values. The From/To intervals (enclosed) in the example are out of order. The interval 2.00 - 3.00 should precede the 3.00 - 4.00 interval.

Missing intervals are acceptable but samples must not overlap. That is, for every hole, the From value must be greater than (or equal to) the To value of the previous sample. The example shows overlapping intervals. Sample intervals can be uneven. That is, the difference between the From and To does not need to be the same for each sample interval in a hole.

If several types of sampled information are recorded over different intervals (ie. different From and To values), separate Interval files should be used, one for each type of information.

If the sampling is continuous, then the From interval should equal the previous To.

The following example, while valid, indicates there is a 0.01m unsampled length between each interval.

It is not necessary to have continuous From/To information in interval files. Absence of intervals or presence of long intervals has no effect on the accuracy of the interval coordinates or display of downhole data.