How to plot line plot with vertical-based data (well-log)?
I was trying to plot geophysics data (well-log) into a scatter plot in Altair using mark_line function, but the line plot is not connecting the dots/ points from top-bottom, but rather from left-right. If you see figure on the left, the data is distributed vertically as clearly seen, in the middle is the result using mark_line, and on the right is the one I wanted, just flipped the X and Y axis.
Is there any way to make a plot to behave just like left figure, but in line encoding?
Or perhaps some form of hacks to flipped the display on the right figure?
chart1 = alt.Chart(w).mark_point(color='green').encode(
alt.X('GR', scale=alt.Scale(domain=[0,300])),
alt.Y('DEPT', scale=alt.Scale(domain=[7000, 7100])),
).interactive()
chart2 = alt.Chart(w).mark_line(color='green').encode(
alt.X('GR', scale=alt.Scale(domain=[0,300])),
alt.Y('DEPT', scale=alt.Scale(domain=[7000, 7100])),
).interactive()
chart3 = alt.Chart(w).mark_line(color='green').encode(
alt.Y('GR', scale=alt.Scale(domain=[0,300])),
alt.X('DEPT', scale=alt.Scale(domain=[7000, 7100])),
).interactive()
chart1 | chart2 | chart3
For those who needs more information, this is a typical dataset from borehole geophysics data/ well-log. Data (GR) is displayed in vertical line, against depth (DEPT).
Thanks for the help!
From what I tested so far, Altair scatters plot using mark_line will always follow the X-axis by default. Therefore, in the case where you want to plot data across Y-axis, one has to specify the order of the connecting line. In the following, I add order = 'DEPT' which was the Y-axis in the plot.
alt.Chart(
w
).mark_line(
color='green',
point=True,
).encode(
alt.X('GR', scale=alt.Scale(domain=[0,250])),
alt.Y('DEPT', sort = 'descending',scale=alt.Scale(domain=[7000, 7030])),
order = 'DEPT' #this has to be added to make sure the plot is following the order of Y-axis, DEPT
).configure_mark(
color = 'red'
).interactive()
Result:
