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Hi there, Thanks for your prompt response. The point spacing varies as it is based on both charted and surveyed data. I have attached a screenshot of the data with the raw data points and it does indeed look like the depressions coincide with these points. Any ideas why this might be? I will try and create a TIN now and see how it looks. Kind regards, Paul
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12-08-2011
09:25 AM
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Dear all, I have created a raster from bathymetric data points using the IDW interpolation method using a 2m cell size. When I add the raster to ArcScene and adjust the parameters, such as increase the raster resolution and increase the quality enhancement to maximum in the rendering tab I seem to get what look like pot holes in the surface (as shown on the attached? Does anyone know why this might be? Any help would be greatly appreciated as I would like to use this data in an important conference at the end of the week. Thanks, Paul
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12-07-2011
09:36 AM
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Dear all, I am trying to create a 3D cone using the '3D Simple Marker Symbol' type within Graduated Symbols, pointed in the direction of flow. The velocity of the vector in the horizontal has been selected for the 'Value' field and the direction of the vector in the horizontal has been selected for the 'Advanced - Rotation' field. When I change the rotation angles in the '3D Placement' dialog box so that the cone appears to orientated with the flow (i.e. with an x rotation angle of 270 degree), it seems to stretch out displaying meaningless data. Has anyone managed to visualise a cone in such a way? Regards, Paul
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11-28-2011
11:55 PM
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Dear all, I have 3D velocity data from an Acoustic Doppler Current Profiler (ADCP) survey that we recently carried out. I have managed to display the vectors in the horizontal plane about 360 degrees (please see attached) but would like to display the data in 3D, i.e. flow in all other directions (up, down, diagonal, as well as horizontal). I have created text files for each of the velocity components (east, north, up/down) as well as the corresponding depths and latitude and longitude for each vector through the water column. I was just wondering whether you know a way of displaying this data in 3D in ArcScene? Kind regards, Paul
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09-21-2011
01:32 AM
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Dear Eva, Your response to Phil seems very interesting. I have a similar problem in that I have 3D velocity data from an Acoustic Doppler Current Profiler (ADCP) survey that we recently carried out. I have managed to display the vectors in the horizontal plane about 360 degrees (please see attached) but would like to display the data in 3D, i.e. flow in all other directions (up, down, diagonal, as well as horizontal). I have created text files for each of the velocity components (east, north, up/down) as well as the corresponding depths and latitude and longitude for each vector through the water column. I was just wondering whether you know a way of displaying this data in 3D in ArcScene? Kind regards, Paul
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09-21-2011
01:28 AM
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Dear all, I would like to create a polygon of a section of this coastline using the snapping tool to snap to an existing polyline. In Mapinfo you can hold shift (while snapping is enabled) and hover over a vertice of a polygon to snap to all vertices along the line instead of having to snap to each one. Is this possible in ArcMap (I have ArcInfo)? Kind regards, Paul
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09-05-2011
01:29 AM
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Thanks for your responses. So I am guessing the MASK function isn't as effective as the barrier option as the MASK is undertaken after the rater interpolation is complete, i.e. the interpolation process outside the point area has been undertaken and the MASK tool is just cropping the raster back to the specificed polygon? Is this the same as using the extract by polygon tool once the raster has been created? From experience, which interpolation methods would you recommend in order to create a high resolution raster surface (mainly for visualisation purposes only) from dense point data using a polyline as a barrier to prevent the interpolation from going outside the area of interest? The IDW method seems to crsh when I try and create a raster using a polyline barrier shapefile? Thanks again, Paul
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09-02-2011
12:36 AM
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Dear all, I am trying to create a raster dataset from a vast number of bathymetric data points. I want to use the kriging method with a cell size of ~20m but when I create the raster surface it is interpolated beyond/outside the zone where the points are located resulting in a surface that is fine within the point area but is incorrect outside. I know that a barrier polyline can be used for the IDW interpolation method to prevent this from happening but does anyone know a way of doing this in the kriging method as the barrier polyline option is not available? Regards, Paul
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09-01-2011
03:33 AM
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Hi Dale, Thank you for your prompt response. I am quite new to ArcGIS so was wondering whether you could advise what the best way is to export the table created in ArcGIS into a geodatabase? Kind regards, Paul
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07-26-2011
01:32 AM
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Hi there, I want to create a dataset of vector data based on ADCP tidal flow data in ArcScene 10. I have managed to add the data, which is in an Excel spreadsheet into ArcScene, however, the data contained zero values for where there was no data (i.e. below the seabed). When I plotted the vectors based on magnitude and direction, the columns that contained no data (i.e. had zeros in the cells) was still plotted. To try and rectify this I changed all these cells to blank and re-imported the data. This seemed to work when I opened the table in ArcScene (i.e. the blank cells had a "<null>" value, however, when I exported the data to a shapefile, it did not retain the "<null>" value and instead the columns were either blank or had a zero in. Does anyone know an easy way to either open up an Excel spreadsheet in ArcScene and change all zero values to Null or retain the Null values when I export to a Shapefile? Thank you. Paul
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07-25-2011
11:18 AM
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