# Presentation: 931754

## User Services Experience  GSFC DAAC

- MODIS Science Team Meeting
-                Greenbelt, MD
-                 July 2002

**http://daac.gsfc.nasa.gov/**
**http://daac.gsfc.nasa.gov/MODIS/**

## Outline

-  Data Discovery / Data Access / Data Delivery
-  Data Usability
-  How Are MODIS Data Being Used?
-  IGARSS 2002
-  Suggestions / Products / Services
-  Coming Attractions

## Data Discovery / Data Access / Data Delivery

-  MODIS Mission is unknown to potential users
-  Data Maturity
-  Enhanced Data Preview
- Time Series are difficult to obtain from the DAAC
-  Large Orders
-  Distribution limits (FTP Push, Pull and Media, Number of granules)
-  Look and feel of the web interfaces
-  Unknown status of order
-  Inconsistent notifications
-  Cryptic error messages
-  Multiple product ordering
- Ocean Quality (Q) maps with Mean (M) maps
-  Geolocation with Ocean Level 2
-  Quality of the archived data (duplicates, DFA’ed and missing data)
-  Data Ordering To Delivery Group (DODGr)

## Data Usability

-  Data Formats
-  How to get MODIS data into a GIS (i.e., GEOTIFF) or other simple format?
-  File Structure
-  Too many parameters in a single file (i.e., 9 to about 800 SDSs!).
-  File sizes are too big (e.g., MOD021KM  ~340 MB and Higher Level 10 to 800 MB!).
-  Tools
- No simple code segments (e.g., IDL)  that one can get and easily insert into their own standard program.
-  What product(s) should be used for a specific application?
-  What channels should be used?
-  Documentation

## How are MODIS Data Being Used?

-  Most Popular MODIS/Terra Products
- Regional Studies
-  ***Seasonal Variations of SST Gradient Cross Georgia Bight – MODIS and in-situ Observations [Chunyan Li******1******,  Jim Nelson******1******, and Jim Koziana******2****** ]***
***                                 ******1******Skidaway Institute of Oceanography , ******2******NASA Goddard Space Flight Center***
*** ***Global Studies
-  MODIS image being used on Oceanography Department’s Graduate admission brochure.

| Discipline | Data Product | Number of Orders | Number of Granules |
| --- | --- | --- | --- |
| Radiometric/Geolocation | MOD021KM
MOD03
MOD02QKM | 9548
5365
5293 | 78,802
64883
27810 |
| Atmosphere | MOD04_L2
MOD35_L2
MOD06_L2 | 2257
2214
2081 | 121,766
32661
71396 |
| Oceans | MOD28L2
MODOCL2A
MODOCL2B | 625
503
438 | 78802
64883
27810 |
| ALL  | ALL | 41,405 | 527,104  (53 TB) |

***Time Series***

## IGARSS 2002

-  Are you aware of the MODIS products that are available?
-  If the products are of interest to you, and you have not ordered any, what stopped you or why did you decide not to:
-  Technical Problems?
-  What should data providers do so that you can acquire the desired data more easily?
-  What are your plans to continue your research or work, given your experience attempting to get MODIS data?
-  What would make the data access better in the future?
-  What is your area of research?

## Response of Remote Sensing data users from IGARSS 2002

-  Those who did not know anything about MODIS data or that it is available (**24%).**
-  Those who have ***NOT*** used it, but see its improvement over older remote sensing data and plan to use it in the future (**32%).**
-  Those who work with higher resolution data than MODIS offers and/or requires real time data (**18%).**
-  Those who are very satisfied with their acquisition of MODIS data (**22%).**
-  Those who expressed some kind of dissatisfaction (**4%).**

- Sample size -- 50

## IGARSS 2002 Conclusions

- MODIS data is being accessed at a healthy pace by small data volume users
- MODIS data is relatively unknown outside the IWG extended community
- There is a natural lag between the availability of  a new data set and users preparing (i.e., proposing) to use the dataset.
- We should NOT expect a significant increase in users retrieving MODIS data until the opportunity arises.
-  TRMM data distribution saw a marked increase approximately 20 months after TRMM launch.

## Suggestions/Products/Services

- Subsetting
-  ***On-Demand Channel***
*** ******Ocean Parameter***
*** ******DODS***
- MODIS L1B Subsample
*** ******5 km, HDF-EOS and Binary***
- Tools: ***SiMAP, HDF-LOOK***
-  End User Subscriptions
-  On-line data access
-  GIS Conversions (RSIP)
-  Good quality data for time of their field experiment
-  Direct broadcast
-  Private Companies providing support to fisheries

## Coming Attractions

- Enhancements to WHOM
- Deployment of Spatial Subscription Server (SSS)
- Data Pool at the GES DAAC
-  ftp anonymous
-  web interface
- External Subsetter
- Order Management System (OMS)