DATA ACCESS EXERCISES
GloVIS client
http://glovis.usgs.gov/
ASTER L1A data
Search for cloud free Corpus Christi
Latitude 27.82 Longitude -97.37
Select Collection: ASTER / VNIR
Enter Latitude: 30, Longitude: -97
Browser will eventually display granules of AOI
Display metadata (right click on selected browse)
Continue to browse through images
 Select granule less than 2 years old
o ASTER L1B U.S. Data less than 2 years old will exist on Data Pool
 Retain Acquisition Date and Time of granule - will use info and download
granule from Data Pool
 Or may add granule to Shopping Cart and Order (fee applies)
Data Pool
http://lpdaac.usgs.gov/datapool/datapool.asp
Download ASTER granule found in GloVIS:
ASTER L1B access only (2 years of U.S. coverage)
 ASTER (AST_L1B.003) FTP directory
 Navigate to Acquisition Date directory- Find Granule from GloVIS Browse
 Download via browser option
MODIS products access (if time permits):
(1 year rolling archive, daily data is 4 day rolling archive)
Search MOD09A1.004 granules (Version 4 available through Dec 2006)
 Select ‘Search ASTER & MODIS’
 Select MOLT Data Group (this is MODIS/Terra products)
 Select MOD09A1.4 Data Set
 Draw on Map, or enter Coordinates (such as Lat 28 to 26, Long -99 to -96)
 Add Selection to Search
 Enter Date Range such as: 09/25/2006– 10/01/2006
 “Get” the granules
 Granule Results- Check metadata
 Notice download options available








Add granules to shopping cart/ View shopping cart
Request GeoTIFF conversion/ Apply to all granules
Geographic projection/ Apply to all granules
Optional: Spatial Subset 30 to 25 latitude, -100 to –96 / Apply to all
granules
Select all bands (default)
Pixel Size: .004167 / Apply to all granules
Submit order/Select ftp download
Confirm Ordering Information
EOS Data Gateway (complete archive)
http://edcimswww.cr.usgs.gov/pub/imswelcome/
Enter as Guest
 Can become a Registered User; keeps preferences such as address info
Primary Data Search screen
Select Multiple Data Sets such as:
ASTER L1A V003
MODIS/Terra Vegatation Indices 250m V005














Example: Draw an area on map around Corpus Christi or your AOI
Date range such as: 05/25/2007 – 06/01/2007
Granule Limit: Can expand to 1000
Submit Search
Data Set Results returned
View Granule Listing
Examine metadata such as Attributes, Cloud Cover, Image Quicklook
(browse)
Do any granules have an On-Line Access link? (links to Data Pool access)
May add a couple of granules each to shopping cart
Notice Data Quality Summary
Choose Ordering Options
ASTER L1A has several products offered
o Select Surface Reflectance for example
o Apply defaults
o Ftp and DVD media options
MODIS products have media options such as dvd, cd, dlt and ftp
Order Form
o May fill out info, however do not submit since ASTER products do
have a fee
TOOLS EXERCISE
Heg Tool (should have HegTool icon on desktop)
Left Panel
 Select Corpus Christi area, ASTER granule (on dvd)
 This is the AST_L1B_00309292000172922_20070720163123_29283.hdf
 Select (VNIR) bands, 3N first
Center Panel
 Select Multi-band GeoTIFF
 Select Nearest Neighbor (default)
 Select Geographic
 Enter pixel size of .000015 for X and Y (1.5E-4)
 No Parameters for Geographic- if selecting UTM, zone 14 would be used.
 ACCEPT button
 Select band 2 (Right Panel)
 ACCEPT button
 Select band 1 (Right Panel)
 ACCEPT button
Right Panel, Select Run
* May verify GeoTIFF within ARCGIS, ENVI, or ERDAS Imagine
MRT (should have ModisTool icon on desktop)
Select MOD09A1.A2008161.h09v06.005.2008170191302.hdf
Select Bands 1, 4, 3 (for natural color)
Latitude/Longitude subset optional: Lat 30 to 25, Long -100 to 95
Select output filename: .tif extension
Select output filetype: GeoTIFF
Select Resampling: Nearest Neighbor (default)
Select Output Projection Type: Geographic
Edit Projection Parameters: Datum = WGS84
Output Pixel Size: 500m
Select Run
* May verify output GeoTIFF within ARCGIS, ENVI, ERDAS Imagine
MRT Example for mosaicking
Select (File Open) :
MOD13A1.A2008145.h08v05.005.2008162221400.hdf
MOD13A1.A2008145.h08v06.005.2008162232542.hdf
MOD13A1.A2008145.h09v06.005.2008162131742.hdf
MOD13A1.A2008145.h09v06.005.2008162111952.hdf
Select bands NDVI, MIR, NIR, RED, BLUE
Select output filename: .tif extension
Select output filetype: GeoTIFF
Select Resampling: Nearest Neighbor (default)
Select Output Projection Type: Geographic
Edit Projection Parameters: Datum = WGS84
Output Pixel Size: 1000m
Select Run
* May verify GeoTIFFs within ARCGIS, ENVI, ERDAS Imagine
ASTER helpful hints
False color composite:
ASTER VNIR, 3N, 2, 1 in red, green, and blue respectively. Red indicates
vegetation.
Pseudo true color composite:
ASTER VNIR bands 2, 3N, 1 in red, green and blue respectively. Green indicates
vegetation.
Simulated natural color composite:
L1B(2) Red
0.75 * L1B(1) + 0.25 * L1B(3) Green
0.75 * L1B(1) - 0.25 * L1B(3) Blue
Suggested SWIR bands:
9,5,4 as RGB
Suggested TIR bands:
14,12,10 as RGB
Enhanced Fire:
6,3,2 as RGB
MODIS helpful hints
Surface Reflectance bands:
1,4,3 in RGB – natural color
7 or 6,2,1 in RGB – enhanced green composite
Vegetation Indices bands:
MIR/NIR/Red as RGB – green indicates vegetation
NIR/Red/Blue as RGB – false red composite
NDVI band: Monitor progression of vegetation.
Create color table from data ranges, and apply throughout time series data.