Creating surface from .adf file - Scale of Coordinate system is off

[Anonymous]

I'm having an issue with scaling that concerns my coordinate system while creating a surface from a .adf file (NED Data). The file is a 1x1 degree tile with elevations in meters. I had to convert the file from meters to feet which I did by exporting the XML and then loading it into an imperial file successfully with each file set to the correct coordinate system. My issue is the scaling of the file itself. The 1x1 degree grid comes in as 1'x1', and the coordinates are correct within that tile. The issue is this 1x1 degree tile is not 1 square foot and I need the scale to be in a real world setting to lay out other features on the surface to scale. Does anyone have any experience with this or have a suggestion on how to adjust the CS or file to make the distances accurate? In the real world the distance between latitudes is something like 360,000 feet, not 1.

I have already tried scaling the surface but this obviously then makes a huge discrepancy with the coordinates within the file, since they align with the 1'x1' tile. Any help is greatly appreciated since I can not move forward with my design without the correct distances between the lat/longs. 

Thanks.

[Anonymous]

Okay great, thanks. I'll try it later to see if it works correctly.

I also need the elevations to be in feet so I assume I'll have to start a
metric dwt, import the point cloud as you mentioned, then export the XML so
I can import it into a imperial dwt. Allen posted the article with the
method I use earlier in this string. Starting with an imperial dwt seems to
just show the elevations that are in meters in ft (80m shows as 80ft).

Crazy process to get this right. Really appreciate both of your inputs.

[Pointdump]

TCG,

From <<<This Thread>>> (Allen, remember that one?) @Alfred.NESWADBA made this awesome video to bring in a GeoTIFF as a Point Cloud:
https://www.youtube.com/watch?v=yLEjwBxayc0&feature=youtu.be

Instead of a TIFF, you can use your ADF file and go with all else in Alfred's video. It will do the LL83 to UTM transformation. I haven't tested it yet to check the Meter-to-Foot Elevation transform. I'll do that in the morning.

Oh, and you'll want to emulate Alfred's Point Cloud settings to bring in the maximum number of points:

MAPPOINTCLOUDTEMPDIR ""
POINTCLOUD2DVSDISPLAY 0
POINTCLOUDAUTOUPDATE 0
POINTCLOUDBOUNDARY 1
POINTCLOUDCACHESIZE 512
POINTCLOUDCLIPFRAME 2
POINTCLOUDDENSITY 100
POINTCLOUDLIGHTING 0
POINTCLOUDLIGHTSOURCE 0
POINTCLOUDLOD 10
POINTCLOUDPOINTMAX 25000000
POINTCLOUDPOINTMAXLEGACY 10000000
POINTCLOUDPOINTSIZE 2
POINTCLOUDRTDENSITY 5
POINTCLOUDSHADING 0
POINTCLOUDVISRETAIN 1

Dave

[Pointdump]

TCG,

Alfred's @Alfred.NESWADBA way works like a charm, not only transforming horizontally, but also converting those meters to US Survey Feet.

I used the CA83-VF Coordinate System. That NAD83.BLM-14N Coordinate System is Hellengone from your data. Unfortunately I can't post the drawing because the necessary Point Cloud IATI file is 434 MB just for that little portion of the USGS Tile.

There are other ways to deal with this data. One would be to use the free MicroDEM to export a CSV and then use Corpscon to convert both Horizontal and Vertical to whatever Coordinate System you wanted to use.

Dave

[AllenJessup]

---

@Pointdump wrote:

TCG,

From <<<This Thread>>> (Allen, remember that one?)

---

Vaguely. My problem is I can't watch YouTube at work. So I haven't tried Alfred's solution. 

[Anonymous]

Dave,

Thanks so much for the video, it's similar to the process the others helped with but does make things function much better.

Thanks again to other contributors as well.

I ran into another issue I'm going to post but figured you guys might know since you are pretty knowledgeable. I need a daylight to go a certain distance below grade, be a certain width, then daylight back up to existing grade. I've attached an image of a section to better depict what I need the assembly to do. I tried to use DaylightStandard but that flat lines after the fill slope and doesnt go below EG. The DaylightMultiIntercept will go below grade but will not offset to create the flat area needed before going back up to grade with a cut slope. Any ideas?

Thanks