# Presentation: 167375

## MODIS Data at NSIDC

**MODIS Data at NSIDC**

*MODIS Collection 5/Long Term Data Record Workshop*

*Molly McAllister & Terry Haran*
*January 17-18 2007*

## NSIDC Overview: Institutional Relationships

- University of Colorado (CU)
- Within CU Cooperative Institute for Research in Environmental Sciences (CIRES) Cryospheric and Polar Processes Division
- Chartered by NOAA’s National Environmental Satellite, Data, and Information Service.  Affiliated with the NOAA National Geophysical Data Center (NGDC)
- Funded by NASA, NOAA, NSF, and others at the program level
- Part of the World Data Center system

## Major Contributors

*NOAA at NSIDC and WDC for Glaciology, Boulder*

*NASA Distributed Active Archive Center*

*NSF U.S. Antarctic Data Coordination Center and Antarctic Glaciological Data Center*

*NSF Arctic System Science Data Coordination Center*

*IARC Frozen Ground Data Center*

***Major Contributors***

## Our Mission

*To make fundamental contributions to cryospheric science and excel in managing data and disseminating information in order to advance understanding of the Earth system.*

***International ***
***	******Data Activities***

***Data Management and Distribution***

***Research***

***Outreach***

## MODIS Snow & Sea Ice Products

- New Product

## Existing Access Methods

- Data Pool
- Subscription
- SNOWI
- MODIS-SNOWI
- EDG (EOS Data Gateway)

## Existing Access Methods contd.

- Data Pool
- Short-term data cache providing FTP access to DAAC products
- Quick access to a limited number of data granules
- MODIS data availability:
- All Collection 5 MODIS snow and sea ice products will be available
- on-line (as soon as they are released)
- Complete timeseries of MOD10A1 V004 and MOD10C1 V004
- Type of access:
- Web drilldown interface (_[http://n0dps01u.ecs.nasa.gov:22000/OPS/home](http://n0dps01u.ecs.nasa.gov:22000/OPS/home)_)
- HDF-EOS-to-GeoTiff conversion available for most products (regridding, reformatting, subsetting capabilities)
- Direct ftp access (_[ftp://n0dps01u.ecs.nasa.gov/SAN](ftp://n0dps01u.ecs.nasa.gov/SAN)__)_
- Metadata and most browse data viewable directly in your browser
- Content can be tailored to meet specific needs.
- Contact nsidc@nsidc.org to request specific data be inserted in the Data Pool.

- Note: Contents of the Data Pool will not match the contents of the (EOS) Data Gateway (EDG)

## Existing Access Methods contd.

- Subscriptions
- MODIS data availability:
- All MODIS L2/3 snow and sea ice products
- Type of access:
- have new data automatically sent via FTP to your local server, or staged on NSIDC's FTP site when data matching your criteria become available (http://nsidc.org/daac/subscriptions.html)

## Existing Access Methods contd.

- MODIS-SNOWI
- MODIS data availability:
- MODIS L3 tiled/gridded snow and sea ice products only
- Type of access:
- Same as SNOWI but allows specification of tiles (http://nsidc.org/data/modis_snowi/search.html)

## Existing Access Methods contd.

- EOS Data Gateway (EDG)
- MODIS data availability:
-  Entire archive of MODIS L2/3 snow and sea ice products
- Type of access:
- Comprehensive web interface (_[http://nsidc.org/~imswww/pub/imswelcome/index.html](http://nsidc.org/~imswww/pub/imswelcome/index.html)_)
- Allows subsetting by spatial region and/or parameter
- Allows searching by Tile

## Resources for Selecting Data:

- Climate Modeling Grid (CMG) Browse Images
- The MODIS Climate Modeling Grid (CMG) Browse page provides quick access to reduced-resolution JPEG images of Terra and Aqua daily global snow cover in a CMG.
- The smaller file size of these images allows users to browse data and identify regions of interest.
- The images are organized by date, making it easy to find data for a particular day or time series. New images are added daily; images from previous dates will be added over time.

## Resources for selecting Data:  MODIS Land Global Browse Images

- _[http://landweb.nascom.nasa.gov/cgi-bin/browse/browse.cgi](http://landweb.nascom.nasa.gov/cgi-bin/browse/browse.cgi)_

**Terra, MOD10, day 2007008 (01/8/2007), Collection 005**

## Tile Searching: Snow Products

- MODLAND Tile Calculator:
- _[http://landweb.nascom.nasa.gov/cgi-bin/developer/tilemap.cgi](http://landweb.nascom.nasa.gov/cgi-bin/developer/tilemap.cgi)_

- MODIS Sinusoidal Grid

-  Tiles are 10 degrees by 10 degrees at the equator.
-  The tile coordinate system starts at (0,0) in the upper left corner and proceeds right
-    (horizontal) and downward (vertical).
-  The tile in the bottom right corner is (35,17).

## Existing Access Methods contd.

- Search ‘N Order Web Interface (SNOWI)
- MODIS data availability:
- All MODIS L2/3 snow and sea ice products
- Type of access:
- A “one-screen” version of the EDG (_[http://nsidc.org/data/snowi/index.html](http://nsidc.org/data/snowi/index.html)_)
- Can automatically order everything returned in a search

## Tile Searching : Sea Ice Products

- Lambert Azimuthal Equal Area map projection centered on each pole. T
- Compatible with NSIDC EASE-Grid.
- Tiles are 951 pixels by 951 pixels.
-  Half of the tiles (313) are in the north polar grid; the other half are in the south polar grid.
- The north polar grid tile coordinate system starts at (0,0) (horizontal tile number, vertical tile number) The tile in the bottom right corner is (18,18).
- The south polar grid tile coordinate system starts at (0,20) and the tile in the bottom right corner is (18,38).

- EASE-Grid

- North Polar Grid

## Tile Searching: Using EDG

***Tile Searching: ****Using EDG*

## MODIS Tools

- MODIS Swath-to-Grid Toolbox (MS2GT):
- Developed at NSIDC
- Resample MODIS HDF-EOS swath data (MOD02*, MOD10_L2, and MOD29) into flat binary gridded files
- Supports a variety of map projections
- Can “stitch” multiple input files
- Unix/Linux only (no Windows)
- Best for MOD02* (destriping ice sheets)

## MODIS Tools contd.

- MODIS Reprojection Tool (MRT):
- Developed by LP-DACC
- Resample MODIS  grid data (MOD10A1, MOD29P1D) into flat binary, HDF-EOS, or GeoTIFF gridded files
- Supports a variety of map projections
- Can “stitch” multiple input files (sinusoidal grids only, e.g. MOD10A1 not MOD29P1D)
- Unix/Linux and Windows (via Cygwin)
- Best for MOD10A1 and MOD10A2

## MODIS Tools contd.

- MODIS Swath Reprojection Tool (MRT-Swath):
- Developed by LP-DACC
- Resample MODIS  swath data (MOD02, MOD10_L2, MOD29) into flat binary, HDF-EOS, or GeoTIFF gridded files
- Supports a variety of map projections
- No stitching capability
- Unix/Linux and Windows (via Cygwin)

## MODIS Tools contd.

- HDF-EOS  to GeoTIFF Conversion Tool (HEG):
- Developed by HDF-EOS team
- Resample many kinds of HDF-EOS swath and grid data (MODIS, ASTER, MISR, AIRS, AMSR-E) into flat binary, HDF-EOS, or GeoTIFF gridded files
- Supports a variety of map projections
- Can “stitch” multiple input files
- Unix/Linux and Windows
- Best for MOD10_L2 and MOD29

## Questions?

- Contact  NSIDC User Services nsidc@nsidc.org