1. Camera Assimilation DA testing with GSI/GSD cloud/hydrometeor analysis
Using GSI with all-sky forward model for HRRR assimilation
Cloud mask, image correlation, or spectral radiances from camera
Sky image derived from GSI first guess

2. Camera Assimilation (cont’d)
Camera image with additional cloud structure
GSI analysis strategy
Cloud mask for hydrometeor subtraction (non-var)
Cloud mask or image correlation term for variational cost function (can also add hydrometeors)
Cloud / Clear mask for hydrometeor subtraction

3. Status Colorado GSI domain test March 30, 2017 test case
Camera cloud mask image read into GSI (gsdcloudanalysis)
First guess hydrometeor field produces simulated image
Cloud mask is used to zero out hydrometeors in camera locations defined as clear

4. Difference Plan view Colorado GSI domain test March 30, 2017 test case
Camera cloud mask image read into GSI (gsdcloudanalysis)
First guess hydrometeor field produces simulated image
Cloud mask is used to zero out hydrometeors in camera locations defined as clear

5. Comparison X-sect Colorado GSI domain test March 30, 2017 test case
Camera cloud mask image read into GSI (gsdcloudanalysis)
First guess hydrometeor field produces simulated image
Cloud mask is used to zero out hydrometeors in camera locations defined as clear

6. Clearing Step Impact – (before)
DA testing with GSI/GSD cloud/hydrometeor analysis
Using GSI with all-sky forward model for HRRR assimilation
Cloud mask, image correlation, or spectral radiances from camera
Subset of grid cells cleared along line of sight
More Complete Clearing

7. Clearing Step Impact – (after)
DA testing with GSI/GSD cloud/hydrometeor analysis
Using GSI with all-sky forward model for HRRR assimilation
Cloud mask, image correlation, or spectral radiances from camera
Subset of grid cells cleared along line of sight
More Complete Clearing

8. Clearing Step Impact
DA testing with GSI/GSD cloud/hydrometeor analysis
Using GSI with all-sky forward model for HRRR assimilation
Cloud mask, image correlation, or spectral radiances from camera
Subset of interpolated grid cells cleared along line of sight
More Complete Clearing

9. Clearing Step Impact
DA testing with GSI/GSD cloud/hydrometeor analysis
Using GSI with all-sky forward model for HRRR assimilation
Cloud mask, image correlation, or spectral radiances from camera
Colors in simulated image denote type of grid points. Green - no cloud & no clearing. Yellow - no clearing of gridpoint having cloud. Magenta – clearing of gridpoint having cloud. Orange – clearing of gridpoint having no cloud.
Subset of grid cells cleared along line of sight
More Complete Clearing

10. Clearing Step Impact
DA testing with GSI/GSD cloud/hydrometeor analysis
Using GSI with all-sky forward model for HRRR assimilation
Cloud mask, image correlation, or spectral radiances from camera
Yellow shade varies with hydrometeor density
As before, except with green points removed. Shades of yellow denote varying amount of hydrometeors at each grid point.
Subset of grid cells cleared along line of sight
More Complete Clearing

11. Clearing Step Impact
DA testing with GSI/GSD cloud/hydrometeor analysis
Using GSI with all-sky forward model for HRRR assimilation
Cloud mask, image correlation, or spectral radiances from camera
Potential Cloud Addition
As before except green indicates gridpoints having potential cloud addition according to the cloud mask.
Subset of grid cells cleared along line of sight
More Complete Clearing

12. Status
Next steps
Convert from Hydrometeor Mixing Ratio to Content (kg/m^3)
Test cloud addition (with variational techniques)
On to Alaska - test access of a couple of FAA Avcams

13. Distance to Terrain (km)
Visibility
Distance to Terrain (km)
Possibly help augment LL edge detection algorithms.

14. Ceiling is low obscuring the terrain with simulated clouds
Visibility
Clear Sky
Low Clouds
Ceiling is low obscuring the terrain with simulated clouds