Extending .asc surface on a horizonatl plan

Hi,
I'm not sure if this is possible but I have a .asc surface (Water Level) which sits above and is smaller than another .asc surface (Ground). Currently the water surface boundary does not intersect with the ground as it's extents are not great enough. I would like to extend the surface out until it intersects with the ground surface. Then create a line feature for length of intersection.
Thanks for any help provided.
I'm not sure if this is possible but I have a .asc surface (Water Level) which sits above and is smaller than another .asc surface (Ground). Currently the water surface boundary does not intersect with the ground as it's extents are not great enough. I would like to extend the surface out until it intersects with the ground surface. Then create a line feature for length of intersection.
Thanks for any help provided.
Comments
Thanks,
Mike
Global Mapper Guru
geohelp@bluemarblegeo.com
Blue Marble Geographics for Coordinate Conversion, Image Reprojection and Vector Translation
Thanks,
Mike
Global Mapper Guru
geohelp@bluemarblegeo.com
Blue Marble Geographics for Coordinate Conversion, Image Reprojection and Vector Translation
1) It raises an area feature and I have a .asc file. I can make an area feature by right clicking and use the create feature along boundary however I am then unable to give the area feature elevations. I tried using the get elevations from surface but it would not work, I believe this is because the area feature created is bounding (just outside) the surface. So how do I create my 3d Area feature for the water rise which has levels sourced directly from the existing water .asc.
2) The water rise tool does not seem to create a surface. Can this be done.
Thanks,
Ron
If you select your area feature with the Feature Info Tool you can press the Vertices button and add per-vertex elevations. Are the per-vertex elevations all the same for the area or should they vary? If you need to get them from the surface you could create a buffer area from the area with a small negative distance to shrink it. You will then have an area feature inside the original that you should be able to get elevations from the terrain surface with.
The water rise doesn't currently create a surface but instead just a new area. You could assign elevations to the new area from the terrain and then create an elevation grid from the new water rise area and the original area being raised if you want though. It should smoothly transition from the original one to the raised one.
Thanks,
Mike
Global Mapper Guru
gmsupport@bluemarblegeo.com
Global Mapper