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#1
Claude

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Hi all,
i've been searching for bathymetry layers and have found various sources but typically they are of small, very detailed areas. My purpose is strictly cosmetic so what I am looking for is generalized data that would cover huge areas. any sources, either free or for cold cash would be appreciated.
Claude
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#2
Hans van der Maarel

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3D Nature (www.3dnature.com) is selling the Ultimate Earth DVD, which contains elevation and bathymetry data (~3 km resolution iirc). It's specifically for use in their VNS product though.

There should be some free sources around. I remember some posts on this subject over at georeference.org and I believe I've bookmarked the site. Unfortunately I'm on vacation right now :( (oh, no... that should be a :lol: ) so I can't get it to you.
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#3
Nick Springer

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Claude,

I have used the ETOPO2 Data set for large areas. The data set covers the whole world and contains both batymetry and hyspography.

You can get it here for free: http://www.ngdc.noaa...rs/01mgg04.html

It's definitely not high detail, but it sounds like that's what you want.

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Nick Springer

Director of Design and Web Applications: ALK Technologies Inc.
Owner: Springer Cartographics LLC


#4
Claude

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thanks!
Platts, a div. of McGraw-Hill
www.maps.platts.com


#5
MapMedia

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Any suggestions for vector bathymetry of world, pref generalized polygons?
Tried contouring and generalizing Cleantopo2, but maybe there is a stone out there already unturned.

#6
frax

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If Etopo2/CleanTopo2 are too high resolution for you, you might want to try the older Etopo5 dataset.
Hugo Ahlenius
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#7
MapMedia

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Any ideas (method leads) on doing a clean raster to vector translation?

I created contours from Etopo2 then interpolated well enough. Using Arcmap 9.1

Here is pic of raster bathymetry.

Posted Image

#8
Hans van der Maarel

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Any ideas (method leads) on doing a clean raster to vector translation?

I created contours from Etopo2 then interpolated well enough. Using Arcmap 9.1

Here is pic of raster bathymetry.

Posted Image


Do you want polygons for the various depth ranges? If so, it's probabely better to look for a way to generate areas from the contour lines. I'm not familiar with how Arcmap works but at least getting the polygons out should be possible. You may have to assign the correct attributes manually though.
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#9
MapMedia

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Yes, I want polygons of the depths.

I have tried a few options in Arcview3.x Avenue but this only works reliably well with closed polylines. Raster to contour creates open polylines, and I am trying to be careful about introducing error into the process.

#10
Geographic Techniques

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Do you have access to Spatial Analyst? If not maybe you could trial it. SA allows you to export your raster to shapefile polys (you will first need to calculate the raster values to integer).
Douglas Norgord, Geographic Techniques
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#11
MapMedia

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Yes, I converted the float to integer and converted to vector, but the results, well, every cell was a polygon. And dissolving does not work either.

#12
Geographic Techniques

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Have you tried reclassifying your depth ranges before exporting with the reclassify tool? It might make it easier to dissolve the individual polygons. When you tried to dissolve the polys before, did you select the multipart part (or not) option? (Don't know if that would make a difference or not). Once you have your shapefile set you could then try generalizing the polys. Otherwise, I'm just not sure why it's not working for you... :(
Douglas Norgord, Geographic Techniques
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#13
MapMedia

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Well I did it - good enough for the small scale map. I reclassified the interpolated raster (based on contours extracted from Etopo2), then ran a neighborhood summary (median, circle) and resampled a lot finer. Then to integer and vector export. The final polygons on depths actually are pretty close to original, but I am still going to rework it some more next week. Thanks




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