Playing around and some interesting observations when studing the pics.

Last time I was at a couple of local lakes did some playing and snapped a couple of screen shots to share.

First picture was taken with my transom mounted HD Si tranducer while running the Ulterra trolling motor on the boat. notice the noise in the picture.

Second picture was with the HD SI transducer on the transom after removing the ulterra and putting a terrova on the boat and before I started playing with contrast and sensitivity. no noise and only thing changed was removing the ulterra and installing the terrova.

Third picture was from trolling motor mounted HD SI transducer after playing with contrast and sensitivity.

Fourth picture was taken with trolling motor mounted HD SI transducer while turning the boat with the trolling motor.

Nice pics dude, the difference after you adjusted the contrast and sensitivity is amazing. Cool pics indeed. How tall do you think those trees are?

Quote:

---

Originally Posted by Speed1

Nice pics dude, the difference after you adjusted the contrast and sensitivity is amazing. Cool pics indeed. How tall do you think those trees are?

---

Good question Speed, I took the first two pictures and edited them to show how I determine the relative height of items in the pics short of freezing the image and using the cursor to measure the object depth at base and height and using any geometry.

In the first picture I circled a feature that I can see on both SI and DI, I can read its height on DI and use that as a gauge to guestimate the height of other objects in the picture.

Same thing in the second picture, it is just that the object is much shorter, but due to the change in the bottom contour in that area, I know I have the same feature in both SI and DI.

So with that said, the trees that look like a fish attactor are probably close to 15 or 16 feet tall, or come to within about 5 or 6 feet of the surface just to the left of where the boat passed. That particular bunch of stickups caught my next to the outside pole when spider rigging and I was running about 7 feet down in 21 feet of water (my transducer for this shot was about a foot deep on my transom at the time) so I know they are at least 14 feet tall.

Great shots, I wish I could get mine that clear and sharp!

Great explanation man, seems like you have it figured out. That's what I love about this site, learn something new almost daily. I could tell by the shadows they were tall, never thought about the di graph showing the exact height, thanks for sharing the pics and the knowledge. Keep em coming.

Quote:

---

Originally Posted by Speed1

Great explanation man, seems like you have it figured out. That's what I love about this site, learn something new almost daily. I could tell by the shadows they were tall, never thought about the di graph showing the exact height, thanks for sharing the pics and the knowledge. Keep em coming.

---

I don't know about having it all figured out, I am still learning and figuring things out as I go. Here is a couple more shots from today.

Created the waypoint on the first one to mark the tree since I hit it with my trolling motor, want to know where it is at to go back and do some single poling around.

The second is another example of finding the same feature on 2d, DI, and SI.

Very cool indeed, thanks for sharing, I am going to upgrade my electronics one day, when I do I'll have all the knowledge you guys are sharing, to jump start the learning curve.

Every time someone replies to this thread and I come back to it, I think of something else I wanted to point out and forgot to. If you notice in the first picture I posted above, you can see the noise introduced by the trolling motor (an ulterra), in the second picture the noise characteristics changed due to changing to a terrova trolling motor. Then if you look at the two pics just above this, the noise is gone. The only changes made were cleaning up the transducer cable by making 6 wraps, 6 inches in diameter and zip tying so keep the wraps uniform, and then running the trolling motor about a foot deeper. Not sure which of these had the impact, but believe it was creating the choke in the transducer cable since moving from the front of the boat to the back of the boat causing the bow to rise some doesn't bring back the noise on the signal.