Plotting NO2 data using Visan

HARP
,
1

Hi everyone!

I’m completely new to HARP, Visan and all this stuff, so I have a question. I’m trying to reproduce this: https://www.unigis.es/wp-content/uploads/2020/10/GeoPython-Atmospheric-Toolbox-COVID19.pdf
So I’m trying to plot NO2. My code looks like this:

product = harp.import_product(my_nc_file, operations="tropospheric_NO2_column_number_density_validity > 50;")

wplot(product)

This is my simple polygon:

{
  "type": "FeatureCollection",
  "features": [
    {
      "type": "Feature",
      "properties": {},
      "geometry": {
        "type": "Polygon",
        "coordinates": [
          [
            [
              27.0703125,
              48.25394114463431
            ],
            [
              50.0537109375,
              48.25394114463431
            ],
            [
              50.0537109375,
              60.60854176060904
            ],
            [
              27.0703125,
              60.60854176060904
            ],
            [
              27.0703125,
              48.25394114463431
            ]
          ]
        ]
      }
    }
  ]
}

And i’m getting this:

screen
screen798×491 157 KB

Is it possible to do it somehow meaningful?

Thank you for your help and time!

2

It doesn’t seem like you are following the steps that are mentioned in the presentation that you linked. I would recommend you at least try that first.

If you then still have questions, please try to ask a more specific question, because I have a hard time understanding what you mean with ‘somehow meaningful’.

3

Thanks. In the presentation the considering area is Spain. I need Moscow, so I have another .nc files. I tried to run import_product with multiple params (various params in operations, post operations), but things getting worse.

By “meaningful” I mean that the bottom bar has colors from blue to red, but it’s all blue in my plot.