# Presentation: 948075

## Level-3 Collection 005 Updates 

- Level-3 Collection 005 Updates
- &
- New Web Site Content

- Paul A. Hubanks          Science Systems and Applications, Inc.

## 
Topic 1.

L3 Updates for Collection 005

**Topic 1.**
** **
**L3 Updates for Collection 005**

## 

a.  Scientific Data Set (SDS) Changes

**a.  Scientific Data Set (SDS) Changes**

## Collection 005 Updates

- derived from
-                   **Aerosol (04_L2)**
**Combined Land & Ocean**
**Land only**** **

***L2 Aerosol  algorithm improvements:***
***- reduced snow contamination in land retrievals at the snow/ice edge***

- Collection 005 Updates

**Notes:**
Primer on reading table 1 dot in the table = Parameter + Statistic = L3 SDS ... L3 SDS names can be inferred ... Parameter name is the SDS prefix, the statistic is the SDS suffix. ... No known bugs in the L3 software ... bugs or limitations in the L2 products get propagated to L3... Almost all the L3 parameters will show improvement in C5 due to improved L1B and Cloud Mask (could have highlighted almost all the parameters yellow) .. I highlighted the aerosol retrieval parameters yellow here to denote the improvement made at L2 (reducing snow contamination over land at any the snow/ice edge)  Green and Red highlight show additions and deletions to L3.  Each dot represents a L3 SDS (in other words a particular statistic for a given parameter) ... Some SDS’s are more space or size intensive  (note dimensions)
Multiday products (E3 and M3) have nearly the same set of parameters (exceptions are PRL and CRL shown here)
There is a slightly expanded list of statistics in the multiday products.  For simplicity will focus on the D3 here.
Angstrom Exp Land is regressed with CODL (1st solution at 0.47 μm)

All Fluxs are deleted ... not working correctly and not fixable at L2.
Two new parameters added ... Cloud Fraction derived from the Aerosol Cloud Mask
And an SDS representing the number of 1km pixels used to create each 10km L2 retrieval
The L3 statistics then show statistics of those counts for a given 1 degree L3 grid cell

## Collection 005 Updates

- derived from
**                  ****Aerosol (04_L2)**
** ****Ocean only**** **

- Collection 005 Updates

**Notes:**
Almost all the L3 parameters will show improvement in C5 due to improved L1B and Cloud Mask (could have highlighted almost all the parameters yellow)

## Collection 005 Updates

- derived from
-                **Water Vapor (05_L2)**
-                              &
**               ****Cloud (06_L2)**
** ****Cirrus detection**
** ****Cloud Top properties**

- Collection 005 Updates

**Notes:**
Almost all the L3 parameters will show improvement in C5 due to improved L1B and Cloud Mask (could have highlighted almost all the parameters yellow)

## Collection 005 Updates

- derived from
-                  **Cloud (06_L2)  **
**  ****Cloud Optical Properties  **
**                        ****(primary retrieval)**

- Collection 005 Updates

**Notes:**
Almost all the L3 parameters will show improvement in C5 due to improved L1B and Cloud Mask (could have highlighted almost all the parameters yellow)
UNCERTAINTY is an estimate of the absolute (gridded and time averaged) uncertainty that is derived from L2 pixel-level relative uncertainties

## Collection 005 Updates

- derived from
-                  **Cloud (06_L2)  **
**  ****Cloud Optical Properties  **
**                        ****(supplementary parameters)**

- Collection 005 Updates

**Notes:**
Almost all the L3 parameters will show improvement in C5 due to improved L1B and Cloud Mask (could have highlighted almost all the parameters yellow)
UNCERTAINTY is an estimate of the absolute (gridded and time averaged) uncertainty that is derived from L2 pixel-level relative uncertainties

## Collection 005 Updates

- derived from
-                  **Atm. Profile (07_L2)****  **

- Collection 005 Updates

**Notes:**
Almost all the L3 parameters will show improvement in C5 due to improved L1B and Cloud Mask (could have highlighted almost all the parameters yellow)

## 

b.  An Example Software Patch: 
L3 sub-sampling and dead detector issue

**b.  An Example Software Patch: **
**L3 sub-sampling and dead detector issue**

## L3 Sub-sampling

| Product 
Family |  L2 Data 
Resolution | L2 Geolocation 
Resolution |  L2 Input Pixels (Max) 
 per 1° L3 Grid (Equator) | Impact |
| --- | --- | --- | --- | --- |
| Aerosol
04 | 10km | 10 km |  121 out of 121 | No |
| Water Vapor 
05 | 1 km | 5 km | 484 out of 12,231 | Yes |
| Cirrus Detection
06_CD | 1 km | 5 km | 484 out of 12,231 | Yes |
| Cloud Top Properties
06_CT | 5 km | 5 km | 484 out of 484 | No |
| Cloud Optical Properties
06_OD | 1 km | 5 km | 484 out of 12,321 | Yes |
| Atmosphere Profile
07 | 5 km | 5 km |  484 out of 484 | No |

## Using the old L3 Logic, when sub-sampling ... 

- Using the old L3 Logic, when sub-sampling ...
*dead Aqua detectors for 1 km aggregated Band 6*

- Detector 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- 10

- «  Dead detector
- «  Dead detector

*Code patch now allows a PCF specified start line for sub sampling – changed from “3” to “4” for C005.**  *
*(note that start pixel remains at “3” and stride remains at “5”)*

*caused all-fill L3 parameters*  *(that used band 6 as input)*

## 

c.  A Software Patch Under Development: 
Screen L2 Cloud Optical Thickness
“partial retrievals” from L3
(est. completion:  end of January 2006) 

**c.  A Software Patch **_**Under Development**_**: **
**Screen L2 Cloud Optical Thickness**
**“****partial retrievals” from L3**
***(est. completion:  end of January 2006)***** **

## 
Topic 2. 

Recent high-profile additions to the
 MODIS-Atmosphere Web Site 

modis-atmos.gsfc.nasa.gov

**Topic 2. **
**Recent high-profile additions to the**
** ****MODIS-Atmosphere Web Site**** **
**modis-atmos.gsfc.nasa.gov**

**Notes:**
Group effort: Bill Ridgway, Jay Dinsick, Mark Gray, Eric Moody, & Charles Gatebe 

## 

a.  C005 Change Summary Documents

**a.  C005 Change Summary Documents**

## Slide 16

**Notes:**
Note there are many more changes, bug fixes, and improvements implemented in L3 for C005 than what I have gone over today, to review the comprehensive list, see the document on the web site!

## Slide 17

**Notes:**
L2 Cloud Opt Prop Change Summary Doc (27 pages ---  includes , high impact summary, before and after images, new parameters, and logic flowcharts)

## 

b.  New “Greatly Enhanced” QA Plan
for Collection 005

**b.  New “Greatly Enhanced” QA Plan**
**for Collection 005**

## New QA Plan:   Helps to unravel the QA mystery

## New QA Plan:  Identifies some previously unknown problems

## New QA Plan:   Clarifies the metadata fields

**Notes:**
Go to the M-A home page ... there is a link in the SPOTLIGHT box.

## Questions?

- hubanks@climate.gsfc.nasa.gov