[Qgis-user] rephrased;. import 3D line into a shapefile?

[David Fawcett]

Tom,

You have laid out an interesting (fun) problem.  I don't have a
solution for you, but a few thoughts on how I would approach it.

1.  I am not sure how you want to display the 3D shape in QGIS.  If
you are just going to symbolize the depth by coloring the line
segments, you could get by with a 2D shapefile and an attribute for
depth.

2.  I would likely write a python script using the ogr python module
to calculate the x,y,z values for each vertex in your line and then
create the shapefile.

3.  Instead of using lat/lon for your spatial reference system, you
may want to think about projecting your original point to a coordinate
system like UTM.  This should make your calculations easier.

David.

On Wed, Mar 18, 2009 at 1:46 PM,  <mtnbiketrail at zzz.com> wrote:
> Okay, let me rephrase the question. I did look at ogr2ogr, csv file import.
> I have a 3D line, but only the beginning vertex has x,y,z. The line is a
> survey of a cave, so only the entrance has a latitude, longitude, and z
> coordinate. The rest are relative to the control point. Any suggestions on
> how to import that?
> Tom
>
>> Subject: [Qgis-user] import 3D line into a shapefile?
>> To: qgis-user at lists.osgeo.org
>> Message-ID: <49BFE4B3.60900 at zzz.com>
>> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>>
>> Hi, I'm a beginner user.
>> Is it possible to import a 3D line into QGIS? I have the text file with
>> distance, compass, and azimuth and want to have it show as a shapefile(?) in
>> 3 dimensions inside QGIS.  How would I go about doing that? Also, correct
>> me, don't I have to use the correct datum to show 3d. Like WGS84? I don't
>> think NAD83 can handle 3D?
>>
>> thanks,
>> Tom
>>
>
> _______________________________________________
> Qgis-user mailing list
> Qgis-user at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/qgis-user
>