INF359-project 2
Weather data – Flesland
Visualization
of weather data 1/1/2000 – 31/12/2010 station number 50500, Flesland,
Bergen.
-
Average air
pressure at station level in HectoPascal (POM)
-
Precipitation
in millimeter (RR)
-
Mean
temperature in Celsius (TAM)
DATA OVERVIEW
The data is
visualized in a 2D view.
The x-axis
represents time and the y-axis represents air pressure.
-
air pressure is visualized as a
spline
-
precipitation as the width of the
spline
-
temperature as the color of the
spline
The pressure
and temperature data are discrete samples of continuous values.
I have used a
Catmull-Rom spline for data interpolation.
There are six
different color scales. Color scales are seen along the x-axis.
Click to show
the data values for the according x-value.
With a longer
time period, the visual info is lost.
It helps to
show the precipitation as point size instead of spline width.
-
Brush by click and drag to show
selected time frame in a new window.
-
Scroll to broaden or narrowing a time
frame.
-
Drag time frame sideways.
-
Drag and drop form one window to
another to show more than one spline in one view.
DATA
COMPARISON
The last 10 days of December
2004-2009.
The view
shows great variation of air pressure between the years.
The most
precipitation is found in 2004, and the least in 2008.
It is difficult to estimate the exact
temperature from the color scales.
Min
temperature is -10.9⁰C, max temperature is 24.2⁰C.
-
It could be helpful to show a
temperature scale below the color scales.
Low pressure
= rain?
Data from all
the years in one view requires sampling of the data set.
The whole
truth is not shown. (View resolution is 430x1005)
Show data
from several years in one view, or slide the view sideways.
-
More precipitation at lower air
pressures.
-
Less variation in air pressure during
the summer moths than in the winter months.
Implementation
Details:
-
C++, Qt, OpenGL
Inspiration:
-
K. Matkovi´c, D. Graˇcanin, Z. Konyha, and H. Hauser.
Colorlines view: An approach to visualization of families of
function graphs.
-
Havre, S.,
Hetzler, B., and Nowell, L. 2000.
ThemeRiver:
Visualizing theme changes over time.