CODEWITHSUNDEEP
pythonplotly
Jayden Rice
Jayden Rice

Reputation: 301

How to change a color bar in Plotly scatter mapbox in Python?

I currently have the following code:

fig = px.scatter_mapbox(coefs_df, 
                        lat="LATITUDE", 
                        lon="LONGITUDE", 
                        hover_name = "NAME",
                        color = "coef",
                        zoom=2,
                        mapbox_style = "carto-positron")

fig.update_layout(margin={"r":0,"t":0,"l":0,"b":0})
fig.show()

That shows: enter image description here It is hard to see, so I want to change the color bar to something like: enter image description here How do I change the color bar so that I have high red, middle white, and low black?

Upvotes: 1

Views: 2879

Answers (2)

BlackMath
BlackMath

Reputation: 1858

Many Plotly Express functions accept a color_continuous_scale argument and many trace types have a colorscale attribute in their schema. Plotly comes with a large number of built-in continuous color scales, which can be referred to in Python code.

These are the built-in continuous color scales:

aggrnyl     agsunset    blackbody   bluered     blues       blugrn      bluyl       brwnyl
bugn        bupu        burg        burgyl      cividis     darkmint    electric    emrld
gnbu        greens      greys       hot         inferno     jet         magenta     magma
mint        orrd        oranges     oryel       peach       pinkyl      plasma      plotly3
pubu        pubugn      purd        purp        purples     purpor      rainbow     rdbu
rdpu        redor       reds        sunset      sunsetdark  teal        tealgrn     turbo
viridis     ylgn        ylgnbu      ylorbr      ylorrd      algae       amp         deep
dense       gray        haline      ice         matter      solar       speed       tempo
thermal     turbid      armyrose    brbg        earth       fall        geyser      prgn
piyg        picnic      portland    puor        rdgy        rdylbu      rdylgn      spectral
tealrose    temps       tropic      balance     curl        delta       oxy         edge
hsv         icefire     phase       twilight    mrybm       mygbm

You can get what you want with the following schema:

continuous_color_scale="rdgy"

enter image description here

In your case, you also need to "reverse" colors schema. You can reverse a built-in color scale by appending _r to its name.

continuous_color_scale="rdgy_r"

Upvotes: 2

MystereFire
MystereFire

Reputation: 25

the color depends on the points you put on the map, if you put red and blue points the bar will be red and blue

Upvotes: 0

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