[Qgis-user] Issue using time manager to show a line that changes in thickness over time

[Christoph Lauber]

Hi Luke

 

I used the time manager a while ago for “colour-changing” on polygons,
depending a temperature attribute.

First thing is, that your layer must show up on the map without using the
time manager plugin. If this is not the case, then you should have a look on
your layer style definition. 

If the layer shows up, but you still don’t see anything in the time manager,
then you should try to make time manager work without any layer styling.
Maybe the problem is not the layer but the timestamp format?

 

 

 

Freundliche Grüsse

Christoph Lauber

 

 

 

Von: Steiginga, Luke [mailto:Luke.Steiginga at nrc-cnrc.gc.ca] 
Gesendet: Dienstag, 30. August 2016 14:50
An: 'qgis-user at lists.osgeo.org' <qgis-user at lists.osgeo.org>
Betreff: [Qgis-user] Issue using time manager to show a line that changes in
thickness over time

 

Hello, 

 

I am running QGIS 2.8.9 and I am currently displaying a line that varies in
thickness along its length. The entire line is made up of many smaller lines
each having a different thickness. It was added using a csv file using a WKT
column that contained the information necessary to make the lines. These
smaller lines all have different thicknesses corresponding to a numeric
value that had been previously calculated in the csv file.

 

This all works as it should.

 

 

My problem is that I now want to have this change at different times when I
use the time manager. In other words, I want the thickness of each line to
change from one week to another. The csv file has a start time and an end
time as shown below in columns “Timestamp”, and “End Time”. The first column
contains the numbers that I want to indicate the thickness.

 

Expected             x                              y
WKT
Timestamp                End Time

0.0001109            -1247455.1          1419954.2
LineString(-1247455.1 1419954.2, -1247455.2 1419954.3)
4/1/2016 6:00        4/8/2016 6:00

0.004392              -1247455.2          1419954.3
LineString(-1247455.2 1419954.3, -1247571 1419993)
4/1/2016 6:00        4/8/2016 6:00

 

 

 

After 4/8/2016 6:00 there are different values for the thickness of the
lines that I want displayed. These are lower down in the same file. I show a
sample of what would be in the csv file at this point below:

 

Expected             x                              y
WKT
Timestamp                End Time

0.002145              -1247455.1          1419954.2
LineString(-1247455.1 1419954.2, -1247455.2 1419954.3)
4/8/2016 6:00        4/15/2016 6:00

0.003391              -1247455.2          1419954.3
LineString(-1247455.2 1419954.3, -1247571 1419993)
4/8/2016 6:00        4/15/2016 6:00

 

 

 

 

Each new week, all columns except the first column remain exactly the same,
because all I want to do is have the thickness of the line segments change
with time.

 

I tried to do this by opening the time manager and adding a layer. I set the
start time as the “Timestamp” column and the end time as the “End Time”
column. I am trying to make QGIS display one thickness for the first week
and then show the second thickness for the second week and so on.

 

I would have expected this to work, but instead the layer doesn’t show up on
the map at all after doing this. 

 

Could someone please tell me what I am doing wrong or how I could possibly
resolve this issue?

 

Thanks,

Luke

 

 

 

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