# Colocalization between T-UGOm and observations

The command [excalibur](../../data-model-processing/excalibur.md) compute the colocalization between in-situ observations with a T-UGOm simulation and produce the difference.

```bash
IGN69=/ecola/share/tmp/training/geoid/ign69_wgs84-1-float.grd
SIMULATION=/ecola/share/tmp/training/gironde-2018/run-R15
DATA=/ecola/share/tmp/training/gironde-2018/insitu-obs

excalibur --meanlevel-offset 0.5 -s 30 \
          -p $SIMULATION \
          -c tugo.state-YYYY.MM.nc -g $IGN69 \
          $DATA/cnav181016_lam1_air_a2.track_fmt_300_lis \
          -o cnav181016-R15_B01_F00-2018-30sec.xyz

```

The output file is a table where each variable is on a different column:

| # | Variable |
|---|----------|
| 0 | time |
| 1 | longitude |
| 2 | latitude |
| 3 | tide + storm surges model correction |
| 4 | GPS sea surface height/WGS84 ellipsoid |
| 5 | IGN69/WGS84 ellipsoid |
| 6 | GPS sea surface height/MSL (IGN69+50cm) |
| 7 | GPS sea surface height – model correction |
| 8 | GPS (boat) speed |
| 9 | flow speed |
| 10 | boat relative speed (8 – 9) |

To plot the pixel cloud with [POCViP](../POCViP/pocvip.md) use the command bellow and refer to [this example](../POCViP/cloud.md):

```bash
pocvip -f cnav181016-R15_B01_F00-2018-30sec.xyz
```