I would expect looking at that you have thick hard trunks but not thick undergrowth.
You might pick up heat sources 10-20m in....they if far in will be un identifyable bit will give you the heads up that there is a heat source over there and to move your postion for a better veiw or wait for it to move into more open spot for Id.
Daytime use of thermals is best in the morning im my experience.....in the evening there is lots of warm rocks stumps etc....not a problem if you are regularly working the same area and get to know the natural heat sources but still mornings or after rain is even better.
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