# Interpolated heatmap with contour line in VegaLite.jl

**URL:** <https://discourse.julialang.org/t/interpolated-heatmap-with-contour-line-in-vegalite-jl/33559>\
**Category:** Visualization\
**Created:** [January 19, 2020, 10:03pm UTC](https://discourse.julialang.org/t/interpolated-heatmap-with-contour-line-in-vegalite-jl/33559 "2020-01-19T22:03:04Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![affans](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/affans/32/11911_2.png) [@affans](https://discourse.julialang.org/u/affans)\
**Post date:** [January 19, 2020, 10:03pm UTC](https://discourse.julialang.org/t/interpolated-heatmap-with-contour-line-in-vegalite-jl/33559/1 "2020-01-19T22:03:04Z")

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Looking to generate a continous heatmap of data, with a contour line, something line the following plot:

 ![testfile](https://global.discourse-cdn.com/julialang/original/3X/7/f/7fa85e10f008bf7939f05f36631bb69a1229c94e.png)

Example data if someone wants to play with it: [delay,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84 - Pastebin.com](https://pastebin.com/QcjFXdBA) (note that there is a row for column names, and a column for the y axis.

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**Author:** ![oheil](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/oheil/32/220745_2.png) [@oheil](https://discourse.julialang.org/u/oheil)\
**Post date:** [January 22, 2020, 5:48pm UTC](https://discourse.julialang.org/t/interpolated-heatmap-with-contour-line-in-vegalite-jl/33559/2 "2020-01-22T17:48:38Z")

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Today I tried but without success.  
I think you should follow this (Vega) example:

> **[Contour Plot Example](https://vega.github.io/vega/examples/contour-plot/)**
>
> Vega - A Visualization Grammar. Vega is a visualization grammar, a declarative format for creating, saving, and sharing interactive visualization designs. With Vega, you can describe the visual appearance and interactive behavior of a visualization...

The contour line could be a single isoline at 1.0

VegaLite does not yet support contour plots

> <https://github.com/vega/vega-lite/issues/1919>
>
> Vega 3 supports \[it\](https://vega.github.io/vega/examples/contour-plot/) already… and it seems like a kind of plots very useful for EDA.