topic extracting values from raster by polyline in Data Management Questions

extracting values from raster by polyline

AnnaHenriksson — Fri, 19 Aug 2011 07:03:10 GMT

Hi, I have altitude data in a raster and want to extract the altitude at a specific line. Like the sample tool but with a line instead of points, how do I do that?

Thanks!

Re: extracting values from raster by polyline

DanPatterson_Retired — Fri, 19 Aug 2011 09:07:33 GMT

Why not convert the line to a grid then use sample, it can take a raster as input (make sure that you use the same cell size and extent as the input raster)
http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#/Sample/009z0000002v000000/

Re: extracting values from raster by polyline

TimothyHales — Fri, 19 Aug 2011 11:03:41 GMT

A similar process to Dan's would be to convert the polyline to points using the Feature Vertices To Points tool. There are a variety of options for determining which vertices to convert (ie: All, Mid, Ends). Then proceed to use the sample tool with the points.

Re: extracting values from raster by polyline

EricRice — Fri, 19 Aug 2011 14:49:03 GMT

Please use Extract by Mask. If you run Feature Vertices to Points you won't be extracting all the cells underneath the line, unless you densify the line in advance to the resolution of the raster you wish to extract from. Extract by Mask requires no conversion in advance of the process and will save you time. The output will be just the pixel values underneath the line.

What is your desired output? Points, Raster, Table...

Regards,
Eric

Re: extracting values from raster by polyline

AlperElci — Thu, 14 Jan 2016 15:12:46 GMT

This tool does not seem to work for a polyline. I am using ArcGIS 10.0 and the error message I got was:

ERROR 010092: Invalid output extent.

Failed to execute (ExtractByMask).

Isn't this tool only for mask areas?