Vector analysis. Computing crossing vector data along a primary vector such as cable or pipeline.

RGBrown

Hi All,

Does anyone have experience or a workflow of computing the crossing points of say a cable or pipeline, along a primary vector, such as a proposed cable/pipeline. The path profile analysis shows the crossing points as a yellow dot but doesnt allow saving of this data althought it does a good job of saving the primary vestor (profile) info.

Any clues as to saving or extracting crossing data (e.g. Distance along line, position and attribute such as description or feature name), would be really useful.

Cheers

R

CarrickCon

Hi @RGBrown

There is no way I know of doing this directly in GM. My workaround is to select the primary vector (pipeline, cable etc.) and zoom in as far as possible and then use the Insert Vertex tool to create a new vertex where the other vector crosses. Unfortunately there is no "snap to intersection" command like AutoCAD in GM that I am aware of.

Would be nice, but c'est la vie!

Ta,

/al

RGBrown

Hi Carrick,

Thanks for that. Your method is what I end up doing. Working with the databases such as EModNet, or NSTA I then edit the crossing line to call up the attributes and select the attribute with the name. I did think of trying to write a script for this but the set up of the attributes is often different so it would not work consistantly.

If you have a lot of crossings (52 active and inactive in this case) I found it quite efficiant to do all the intersections and paste the final feature vertex list in Excel and then extract the intersection KP and coords into a seperate table as below. Attributes still need to be combined manually and to get the KP you still need to do the curves.

From this:

To this:

and hiding some columns:

ArcGIS only seems to do the KP. I must get up to speed in GRASS/QGIS and see what the options there are.

Cheers

R