# Presentation: 200106

## MODIS Validation Review 2000

- Validation and Correction for the MODIS Spatial Response
- 	Dr. Robert Schowengerdt, PI (Electrical Engineering)
- 	Dr. Stuart F. Biggar (Optical Sciences Center)
- 	Dr. Stuart E. Marsh (Arid Lands Studies)
- 	Alexandre Braga (EE), Francisco Rojas (EE)
- 	University of Arizona

- Digital Image Analysis Laboratory

## Topics

- Overview
- Data Collected
- Data Sharing
- Experience with Obtaining MODIS Data
- Interactions with Other Groups
- Publications

- Digital Image Analysis Laboratory

## Overview

- Goals
- Determine MODIS spatial response using pre-launch data and post-launch imagery
- Investigate influence of spatial response on MODIS VIs (MOD-13)
- Develop MTF correction algorithm
- Our project is primarily a *sensor calibration* project, with potential application to any MODIS science product derived from Level 1B radiance

- Digital Image Analysis Laboratory

## Approach
Analysis of pre-launch test data
IAC and SRCA
Single/multitemporal images with geometric target
All American Canal (near Yuma, AZ)
Sensor cross-calibration analysis of spatial response
Landsat-7 ETM+
ASTER
Lunar limb profile analysis for spatial response through space viewport
On-orbit SRCA data
Compare VIs before/after MTF correction

- Analysis of pre-launch test data
- IAC and SRCA
- Single/multitemporal images with geometric target
- All American Canal (near Yuma, AZ)
- Sensor cross-calibration analysis of spatial response
- Landsat-7 ETM+
- ASTER
- Lunar limb profile analysis for spatial response through space viewport
- On-orbit SRCA data
- Compare VIs before/after MTF correction

- Digital Image Analysis Laboratory

## Data Collected

- Desirable data characteristics
- High frequency content
- Directional features
- High contrast
- Spectrally neutral features
- Temporally stable features
- High resolution calibration of features (i.e. ETM+ or ASTER)

- Digital Image Analysis Laboratory

## Landsat/MODIS datasets 
Landsat ETM+ (bands 3,4) and MODIS (bands 1,2) 
Carrizozo Malpais lava field (Jornada LTER)1
05/09/2000
06/10/2000
07/28/2000
09/30/2000
Maricopa Agricultural Center2 
09/26/2000
Walnut Gulch2
09/12/2000
09/28/2000
Landsat Level 1G in all cases

- Landsat ETM+ (bands 3,4) and MODIS (bands 1,2)
- Carrizozo Malpais lava field (Jornada LTER)1
- 05/09/2000
- 06/10/2000
- 07/28/2000
- 09/30/2000
- Maricopa Agricultural Center2
- 09/26/2000
- Walnut Gulch2
- 09/12/2000
- 09/28/2000
- Landsat Level 1G in all cases

- 1 http://modis-land.gsfc.nas.gov/val
- 2 USDA-ARS, Tucson

- Digital Image Analysis Laboratory

## 
ASTER/MODIS datasets
Limited success
ASTER data at the DAAC1
Found 300 Level 1B ASTER data sets
As of Dec 2000, it appears that no MODIS /ASTER 1B pairs are processed after late May 2000.
ASTER/MODIS pairs found to-date
Jornada	05/09/2000
Central Bolivia	05/25/2000

- ASTER/MODIS datasets
- Limited success
- ASTER data at the DAAC1
- Found 300 Level 1B ASTER data sets
- As of Dec 2000, it appears that no MODIS /ASTER 1B pairs are processed after late May 2000.
- ASTER/MODIS pairs found to-date
- Jornada	05/09/2000
- Central Bolivia	05/25/2000

- 1 http://redhook.gsfc.nasa.gov/~imswww/pub/imswelcome

- Digital Image Analysis Laboratory

## Carizzozo Malpais Lava Field

- MODIS B1
- May 9, 2000

- Digital Image Analysis Laboratory

## Road target
ETM+ B3		ASTER	B2		MODIS B1

- ETM+ B3		ASTER	B2		MODIS B1

- Digital Image Analysis Laboratory

## Maricopa Agricultural Center
Landsat ETM+/MODIS 1B registration
ETM+ pixel-by-pixel reconstruction using MODIS geolocation data

- Landsat ETM+/MODIS 1B registration
- ETM+ pixel-by-pixel reconstruction using MODIS geolocation data

- MODIS L1B scan offsets

- Digital Image Analysis Laboratory

## All American Canal (AAC) 
60m wide
Nadir view desired
04/10/2000 (MODIS only)
06/29/2000 (MODIS/Landsat)
09/01/2000 (MODIS/Landsat)
10/03/2000 (MODIS/Landsat)

- 60m wide
- Nadir view desired
- 04/10/2000 (MODIS only)
- 06/29/2000 (MODIS/Landsat)
- 09/01/2000 (MODIS/Landsat)
- 10/03/2000 (MODIS/Landsat)

- Digital Image Analysis Laboratory

## April 4, 2000 and June 29,2000 MODIS B1
Lat/long files show relative pixel shift
Interleave two dates to achieve subpixel sampling
Reduces aliasing (undersampling) in MTF analysis

- Lat/long files show relative pixel shift
- Interleave two dates to achieve subpixel sampling
- Reduces aliasing (undersampling) in MTF analysis

- Digital Image Analysis Laboratory

## Moon Scans 
Limb profiles are another measure of spatial response
Difficulties intepreting the On-Board Calibration (OBC) files related to lunar acquisitions
Ref: http://mcst.gsfc.nasa.gov/lunarview.html
We believe we have found the appropriate OBC hdf files, but not sure about the format
Working with MCST to resolve

- Limb profiles are another measure of spatial response
- Difficulties intepreting the On-Board Calibration (OBC) files related to lunar acquisitions
- Ref: _[http://](http://mcst.gsfc.nasa.gov/lunarview.html)__[mcst](http://mcst.gsfc.nasa.gov/lunarview.html)__[.](http://mcst.gsfc.nasa.gov/lunarview.html)__[gsfc](http://mcst.gsfc.nasa.gov/lunarview.html)__[.](http://mcst.gsfc.nasa.gov/lunarview.html)__[nasa](http://mcst.gsfc.nasa.gov/lunarview.html)__[.](http://mcst.gsfc.nasa.gov/lunarview.html)__[gov](http://mcst.gsfc.nasa.gov/lunarview.html)__[/](http://mcst.gsfc.nasa.gov/lunarview.html)__[lunarview](http://mcst.gsfc.nasa.gov/lunarview.html)__[.html](http://mcst.gsfc.nasa.gov/lunarview.html)_
- We believe we have found the appropriate OBC hdf files, but not sure about the format
- Working with MCST to resolve

- Digital Image Analysis Laboratory

## Data Sharing

- We have received Landsat-7 data from:
- USDA-ARS (Tucson)
- Alfredo Huete, Kurt Thome (UA)
- We offer our data via
- Mercury
- Arizona Regional Image Archive (ARIA)
- http://aria.arizona.edu
- DIAL/MODIS webpage
- http://www.ece.arizona.edu/~dial
- Email: _[dial@ece.arizona.edu](mailto:dial@ece.arizona.edu)_

- Digital Image Analysis Laboratory

## Experience with Obtaining MODIS Data

- Major problem in finding MODIS 1B data that coincides with ASTER 1B
- Data search is slow
- several criteria to satisfy for suitable scenes
- not automated, requires significant user interaction

- Digital Image Analysis Laboratory

## Interactions with Other Groups

- MCST (Bruce Guenther, Harry Montgomery, Farida Adimi) - since inception of grant
- Robert Wolfe (SDST) - Francisco Rojas internship, summer 1999
- Jim Storey (USGS/Raytheon Landsat Office) - two week visit to UA, August 2000
- Current collaboration with Alfredo Huete’s group at UA on incorporating MTF into MODIS VI validation

- Digital Image Analysis Laboratory

## Publications

- IGARSS 2000 (Honolulu, July 2000)
- Joint paper with Alfredo Huete’s group (UA)
- SPIE 45th annual meeting, (San Diego, August 2000)
- 2 papers on-preflight MTF and focal plane registration
- Submissions
- IGARSS 2001 (Sydney, July 2001)
- SPIE 46th annual meeting (San Diego, July 2001)
- Remote Sensing of Environment special MODLAND issue
- MS EE (UA), Alexandre Braga, December 2000

- Digital Image Analysis Laboratory