Apologies if this is a bit of a daft question, I'm a bit new to all of this :)
Question
Creating contours from ERSI ASCII Grid (ASC) data?
+6- Contributor
I've been given some free to use Digital Surface and Digital Terrain models consisting of TIF, ETW, XML and ASC files. I was wondering whether I would be able to create contours (in TAB format) from the included ESRI ASCII Grid files (ASC)?
Hi Darren,
I would use the RasterCellCoercer to transform the raster to 3D points, and then create contours using the ContourGenerator.
Takashi
You might be able to send the raster directly to POINTS/LINES port of the ContourGenerator.
ContourGenerator help: POINTS/LINES: These input features may be 2D or 3D, and may reside inside a raster, a point cloud, or other aggregate structures.
Takashi
+6- Contributor
Hi Takashi,
Many thanks for the reply, it does look like you can send the raster directly to the ContourGenerator although I'm having a couple of issues with the output.
After experimenting with the parameters a little I've managed to generate a 5m contour file but am experiencing a large number of 'spikes'. Could you suggest a way to minimise the spike effect?
Darren
+18- Safer
Hi,
It is possible that the spikes are actually locations of no data or extreme pixel values, I would try to resample the raster to possiy reduce nodata/extreme pixel values before generating the contours.
Itay
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