I'm new to this and I have a question to you others who uses RM to map lakes. What interpolation do you use in lakes (my lakes is between 20 and 750 hectares).

Scincerely,

Herman.

I think it depends on a few circumstances:

- How many log data have you already generated

- Do you want full coverage of the map or gaps which indicate the missing areas

Basically: as small as possible, as large as necessary. Try it with your existing log data.

If you do not have any log data, you could first create a grid of 100 or 200 meters and fill the gaps between those lines later, it it would be necessary.
Another consideration is whether the ground is level or whether small holes and mountains exist. Those surfaces should be recorded additionally with the smallest possible scanning, and from different directions.

When we get side mosaic, it will easy to see where it is interessting to go on ot not for more log!

Hubert wrote:
I think Hubert has summed it up nicely. Ideally, you would use as low an interpolation value as possible, but we appreciate that a lot of users like to "fill in the holes" of maps by using larger values. It is very important to remember that all interpolation is only guess work, and the larger the value, the more likely the guess is to be wrong. In the case of large interpolation values, which can be up to 200m, there is a lot of scope for error.

Just curious, what happens to parts of the map that has short distance between data points (map can be created with 25 or 50 m interpolation) when you set a high value on interpolation? Are they affected negatively? I like to have the maps covering all the way to the shoreline but it's not possible in some shallow bays where I can't get closer than 100-200 m of the shoreline.
Sometimes I can't cover the bays at all and get gaps in my map, anyone here who has a trick to solve this? Is it possible to add data manually in RM?
Best regards,
Markus

There will be no change at all to areas inside the interpolation limit, as the interpolation limit is raised or lowered. The only change is that areas of the map that were not filled might become so.

There is no explicit function for adding depths, but there are a few ways you can do it if you want. One of the easiest ways is to add a "boundary", but un-check the options "Act as boundary" and "Show in map". Leave the option "provide depth" checked, and set an appropriate depth value. That will give you the effect of having extra depth points wherever you draw them (only one depth per boundary, so you may need a few). Bear in mind that you probably don't need too many new depth points to "fill in" a gap. For example, if your interpolation limit is set to 100, and you gap is say 150m across, then just a single point in the middle will be enough to "bridge the gap" and fill the area.