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Hi Samual,

Some good answers here, and I have had some good luck developing pipeline profiles in GIS from DEMs. The precautions mentioned by others here are important, as DEMs often limit a level of precision with elevation and spatial data. The 5 m grids you suggested sounds great, but of course you want to be sure of the elevation data accuracy and precision. As with any method of developing a pipeline profile, you want to be sure allow for the margin of error introduced by your elevation data (be it DEMs or abney level). That is, be sure not to get too close to your minimum and maximum elevation tolerances for your pipeline. As Arjen mentioned, theodolites are a reliable method for getting quite accurate profiles, but if you don't have access that kind of analysis, there are less accurate methods can be sued with the right provisions.

There are, I believe quite a number of ways in ArcGIS to create a profile from a DEM. The way I have used is with the 3D analyst extension. I am not sure if you have access to the ArcGIS software and extensions but if you do, I can look for some specific instructions to send your way.

Good luck,

Mark

Hi Samual,Samuel,

Some good answers here, and I have had some good luck developing pipeline profiles in GIS from DEMs. The precautions mentioned by others here are important, as DEMs often limit a level of precision with elevation and spatial data. The 5 m 5m grids you suggested sounds great, but of course you want to be sure of the elevation data accuracy and precision. As with any method of developing a pipeline profile, you want to be sure allow for the margin of error introduced by your elevation data (be it DEMs or abney level). That is, be sure not to get too close to your minimum and maximum elevation tolerances for your pipeline. As Arjen mentioned, theodolites are a reliable method for getting quite accurate profiles, but if you don't have access that kind of analysis, there are less accurate methods can be sued used with the right provisions.

There are, I believe quite a number of ways in ArcGIS to create a profile from a DEM. The way I have used is with the 3D analyst extension. I am not sure if you have access to the ArcGIS software and extensions but if you do, I can look for some specific instructions to send your way.

Good luck,

Mark