Bathymetry Interpolation ProblemBathymetry Interpolation Problemhttps://oss.deltares.nl/c/message_boards/find_thread?p_l_id=1806765&threadId=10273172021-03-04T22:45:51Z2021-03-04T22:45:51ZRE: Bathymetry Interpolation ProblemLuca Castruccihttps://oss.deltares.nl/c/message_boards/find_message?p_l_id=1806765&messageId=10375312016-10-07T03:49:01Z2016-10-07T03:49:01ZHi Richard,<br /><br />Thanks for your reply. I followed your advises but unfortunately I was not able to find a solution for my problem using Delft3D GUI tools. Thus, I decided to write a Matlab script and I solved the issue.<br /><br /><br />Best <br /><br />LucaLuca Castrucci2016-10-07T03:49:01ZRE: Bathymetry Interpolation ProblemRichard Measureshttps://oss.deltares.nl/c/message_boards/find_message?p_l_id=1806765&messageId=10286582016-09-25T22:30:50Z2016-09-25T22:30:50ZHi Luca,<br /><br />Adjusting the settings for grid cell averaging might help you fill more points using grid cell averaging: In QUICKIN if you go to Settings - General you get a dialog box where you can adjust the "minimum number of averaging points" and the "relative search size for averaging". The default setting require a minimum number of 4 points per cell in order for grid cell averaging to work. Decreasing the minimum number of points and/or increasing the search radius may be useful to you?<br /><br />I'm not sure why internal diffusion or triangular interpolation aren't working for you as they usually work well? Have you tried deleting all polygons (Operations - Delete - Polygons) and then drawing one simple polygon over the area you want to work on before applying the tool? These tools only fill in null depths, they don't overwrite depths already assigned (e.g. by grid cell averaging) so there is no need to be too precise with the polygon.<br /><br />Good luck,<br />RichardRichard Measures2016-09-25T22:30:50ZBathymetry Interpolation ProblemLuca Castruccihttps://oss.deltares.nl/c/message_boards/find_message?p_l_id=1806765&messageId=10273162016-09-23T16:45:20Z2016-09-23T16:45:20ZHi all,<br /><br />After having extracted the bathymetry from the raster using ArcGIS tool Spatial Analyst Tool - Extraction - Sample, I was able to import the data on Delft3D-Quickin. I decided to use Grid Cell Averaging as interpolation method, since I have more than one bathymetry data inside a grid cell. The problem is that some grid cells remain without value, even if they are in the middle of the ocean, thus they should have bathymetry data. When I click on these grids, Quickin gives me the values "nan". To find a solution, I have tried to use polygon and internal diffusion, but it does not work and the grids remain without values. I have also used Quickin tool Operations - Combine Depth and Uniform Value - Fill Missing Depth with Uniform Value, but I did not solve the problem as well. Is anyone had this problem? This problem is really frustrating since it does not let me load the bathymetry .dep file on Delft3D-FLOW.<br />Another question, are we allow to have grid points close in the shore that do not have bathymetry data? I found very hard to design a grid that fit perctly the bathymetry; thus some grids cells remain outside.<br /><br />Thanks for your help guys!!!!Luca Castrucci2016-09-23T16:45:20Z