# Surface obs test with error

**URL:** <https://forums.jcsda.org/t/surface-obs-test-with-error/546>\
**Category:** JEDI\
**Created:** [November 2, 2023, 7:30pm UTC](https://forums.jcsda.org/t/surface-obs-test-with-error/546 "2023-11-02T19:30:12Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![HuiLiu-NOAA](https://yyz1.discourse-cdn.com/flex031/user_avatar/forums.jcsda.org/huiliu-noaa/32/194_2.png) [@HuiLiu-NOAA](https://forums.jcsda.org/u/HuiLiu-NOAA)\
**Post date:** [November 2, 2023, 7:30pm UTC](https://forums.jcsda.org/t/surface-obs-test-with-error/546/1 "2023-11-02T19:30:12Z")

</div>

Hello,

I have a question about JEDI and would like to seek advice.

I am trying to run a test single analysis using ADPSFC surface P, T, and UV observation. I tried the VertInterp operator but got an error:

neededVars remaining after Vader::changeVar: 2 variables: height, surface\_altitude  
Field\_fail: Field height cannot be obtained from input fields.  
OOPS Ending 2023-11-02 14:49:46 (UTC-0400)

I am not sure why the operator asked the 2 variables.

The yaml obs part is as:

```
  obs operator:
     name: Composite
     components:
     - name: VertInterp
       vertical coordinate: air_pressure
       observation vertical coordinate: height

```

# observation vertical coordinate: pressure

# interpolation method: log-linear

```
       variables:
       - name: airTemperature
     - name: SfcPCorrected
       variables:
       - name: stationPressure
       da_psfc_scheme: UKMO
   linear obs operator:
     name: Composite
     components:
     - name: Identity
       variables:
       - name: airTemperature
     - name: Identity
       variables:
       - name: stationPressure

```

Thanks for any suggestions.  
hui