I have a couple of suggestions - I didn't use QGIS 1.7 a lot - my best
reference currently is 2.0.
1. You can add the csv to qgis and use the contour plugin from the
repositories - I'm not sure exactly how it works but you'll need a few
extra python libraries like numpy and matplotlib (and I think that is a
python library - but it will tell you upon installation).
2. Convert the csv to a shapefile and use the rasterize (vector to
raster tool) under Raster > Conversion. That would build a elevation
model (or surface) and from there you can generate contours. (To
generate a shapefile add the csv using the delimited text tool and then
right click the layer and "save as").
3. Be a manly man and use gdal and vrt files. I have never done this -
but it looks like fun and a good learning exercise. If I had a CSV file
I would attempt it - but the only thing I currently have is several
points in a straight line (your example).
I hope that points you to a closer direction for getting the contours.
Good Luck - we're all counting on you.
Randy
-----------------
Randal Hale, GISP
North River Geographic Systems, Inc
http://www.northrivergeographic.com
423.653.3611 [email protected]
<mailto:[email protected]>
twitter:rjhale
http://about.me/rjhale
On 11/30/2013 11:02 PM, Eyal Saiet wrote:
Hello,
I was able to create contour lines from a CSV file using QGIS 1.7,
bust since I moved to 2.0 I am failing to acquire the skills I had
with the earlier version.
The topo data is a CSV, here is a sample:
Depth_cm,UTM_East,UTM_North
55.27,405472.81,7613300.3
60.38,405474.03,7613300.3
63.63,405476.06,7613300.2
62.8,405478.1,7613300.1
58.47,405479.72,7613300
63.99,405480.94,7613300
65.28,405483.38,7613299.9
66.06,405485.01,7613299.8
64.82,405486.23,7613299.8
57.9,405488.67,7613299.7
I am now trying to follow the documentation to create a contour line
in link
<http://www.qgis.org/en/docs/user_manual/grass_integration/grass_integration.html?highlight=contour>.
At "In the list of tool categories double click /Raster ? Surface
Management ? Generate vector contour lines"...
/
/I found "RASTER" at the top of the screen to the right of "Vector"
and left to "Database" But there is no"///Surface Management" and
therefore I am at a dead-end trying to follow the above instructions.
//
/Anotehr option after uploading the csv file was to go to
/Raster-->Extraction-->Contour. This failed as well. By going through
the path to the left I am prompt for a file input and it does not take
loaded csv layer.
/// /
Really need your help
--
Eyal Saiet
University of Alaska Fairbanks
Fairbanks, AK 99775
(907) 750 6555 (cell)
[email protected] <mailto:[email protected]>
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