I would be glad to have a bigger max interpolation limit for some cases, e.g. 300 m.

I know about the big mistakes happening with a great interpolation, but there are some reasons, this would be very helpful:

If I do mapping with only data traced from a paper map, there are no chances to get deep lines lying far enough along. In this cases it is necessary to do one or more lines between as a guesswork, just to get a colored, closed background.

In some cases, of course, a high max interpolation creates a lot of mistakes and missing details, but in bigger lakes there often are deep areas or plateaus with no changing of the depth. A lot of our lakes have areas with the deepest areas in a dimension of for example 500 x 2000 meters and depth values from 70 or even 120 meters. This areas, if interpolated, do not really matter and do not make worse a map.

Great interpolation is not necessary if you have a lot of log data, but if starting on a new lake it helps to get a good looking map after a short time, which could be improved successively.

Hubert,

have you considered creating some manual contours (home-brew gpx tracks with a constant depth) and letting RM use those ? Its sometimes a very useful technique where you have reed lines at a constant depth, or you know that the profile mimics the shoreline.

Trevor

There is a (slightly clunky) way of doing this directly in the define map view. Make a new boundary, and either draw a line or add some points by using the pencil tool. Then in the boundary settings, uncheck "is boundary" and "show in map", but leave "provides depth" checked, and set the depth to where you want it. This will then act as a set of depth points and contribute to the map in the same way that Trevor describes.
Having said that, we may consider an increase in the max interpolation. 300m is a long way though - you could miss a lot!

Matt

Maybe a quick and simple "input manual depths" facility would be useful ? I certainly find it an invaluable tool.

T

The difference is not, where I make additional lines, in RM or with Google Earth. The difference is, if I do some manual mapping by drawing bathymetric lines, RM could do the auto complete / interpolation instead of manually inserting additional lines just to stay below the limit.

I just imported csv's former used with DrDepth and had a pretty good, completely colored map. Now in RM it is just a fragment of a map, although the ground is unspectacular as a bath.

Never the less, for precise results everybody could decrease the interpolation limit as usual. It should be just a extension of opportunities to get a fully colored map and complete vector lines with little data.

In DD there is a warning if you set the limit at high values - just as an idea ;)

..Only my ideas.

i have spoken with matt a few weeks ago about something similar.
DD had the possibility to adjust Interpolation and Extrapolation.
This was a fine feature to extrapolate out to shores much more than interpolate inner the map.
Every data, almost fals date on the way to shore looks better than no data results in empty space.
And for interpolation, i think, white places with no data, filled with interpolated data,
gives also a better look at the map.
And if only areas without real data are highly interpolated, it doesn't harm the real data.

So if RM can adjust...
a.) Extrapolation, on the way to boundaries (shores, islands) and blank areas with no boundaries.
b.) Interpolation like it does in 1.5, range up to 100 Meters (but finer adjustable ?)
c.) Interpolation for the blank Areas, where no data was found, up to 300 Meters ore more.

Might this be an idea to make us happy, to satisfy us ? :-)
(only if it is for matt codeable without slowing down the developing speed. :-) )

Luke,

I like the idea.

Guido

Luke wrote:
Amen :)

Extrapolation limit (everywhere, not just shores) is one major wish for me and also finer adjustable interpolation areas.

/Martin

I realize this topic thread is pretty old now but I thought I would chip in. I have just purchased version 2 and am experimenting with trying to make my first couple of maps. I am currently working on a fairly large lake with decent track coverage but even with the Max Interpolation set to 250m,, I end up with a very patchy (and effectively useless) contour map. I would certainly concur with Luke's suggestions for greater control over Interpolation and extrapolation. There could be some sort of disclaimer if the user decides to go over 250m? Having it arbitrarily maxed at 250m is quite limiting.
Thanks!

There is now an option to add spot depths reefmaster.com.au/reference2/topics/idh-topic490.htm but perhaps a patchy map is more realistic and safe than one with very large interpolated areas.