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Instructions for Handling ASTER and MODIS Data Sets Using the Data Pool HDFEOS-to-GeoTiff (DP-HEG) Tool
2.0 Using DP-HEG with ASTER Data Sets
2.2 Description of the Results Page Returned from a DP-HEG Search for ASTER Level-1B Data Sets
2.3 Default Values Used in the Format and Projection Conversion Utility For ASTER Level-1B Data Sets
2.4 Handling ASTER Bands 3N and 3B
2.5 Geo-referencing DP-HEG-derived ASTER Output
3.0 Using DP-HEG with MODIS Data Products
3.2 Description of the Results Page Returned from a DP-HEG Search for MODIS Data Products
3.3 Default Values Used in the Format and Projection Conversion Utility For MODIS Grid Products
4.0 Ordering Options for ASTER and MODIS Products
The Data Pool HDFEOS-to-GeoTiff (DP-HEG) is an interface where a set of tools is available as part of the ordering process from the LP DAAC (http://lpdaac.usgs.gov/main.asp) for data manipulation of ASTER and MODIS data sets via the Data Pool (http://lpdaac.usgs.gov/datapool/datapool.asp). The following is a set of basic instructions highlighting the functionality and capabilities of the DP-HEG. There are varying options for processing and ordering different ASTER and MODIS products. The following instructions are therefore broken down by the two sensors.
Note: DP-HEG is not a set of stand-alone tools that you download for independent use. It is also important to remember that the DP-HEG is different from the stand-alone HEG tool.
The following tables outline the basic capabilities of the Data Pool HEG and the various output options that are available for the ASTER Level-1B and the MODIS products:
| Key Data Pool HEG Capabilities | |
|---|---|
| Service | Options |
| Format Conversion | HDF-EOS or GeoTiff |
| Projection Conversion | UTM, Geographic, Polar Stereographic, Sinusoidal |
| Spatial Subsetting | Only for MODIS Data |
| Data Pool HEG Output Products Available for ASTER and MODIS Data | |||
|---|---|---|---|
| Output | ASTER Level-1B Products | Terra MODIS Grid Products | Aqua MODIS Grid Products |
| HDF No-Change (Original) | x | x | x |
| GeoTiff No-Change/UTM | x | ||
| GeoTiff No-Change/Sin | x | x | |
| HDF Geographic | x | x | x |
| GeoTiff Geographic | x | x | x |
| HDF Polar Stereographic | x | x | x |
| GeoTiff Polar Stereographic | x | x | x |
| HDF UTM (North-Up) | x | x | x |
| GeoTiff UTM (North-Up) | x | x | x |
2.0 Using DP-HEG with ASTER Data Set
The only ASTER product available via the Data Pool is the ASTER Level-1B data set over U.S. and its territories. The ASTER Level-1B Registered Radiance at the Sensor product contains radiometrically calibrated and geometrically co-registered data for all the channels acquired previously through the telemetry streams of the VNIR, SWIR, and TIR telescopes in ASTER Level-1A (http://lpdaac.usgs.gov/aster/ast_l1b.asp).
The embedded functionality in DP-HEG allows you to manipulate ASTER Level-1B with particular format conversion and projection options. The following table highlights those available options and also provides details on the ordering mechanisms.
| Input | Output Format | Output Projection | Description |
|---|---|---|---|
| ASTER Level-1B HDF-EOS + UTM | No change | No change | The original ASTER HDF-EOS swath-oriented UTM projection is copied to the DP download directory. |
| ASTER Level-1B HDF-EOS + UTM | GeoTiff | No change | The original ASTER HDF-EOS swath-oriented UTM projection is converted to swath-oriented single-band UTM GeoTiff files. Each band has an accompanying geolocation text file extracted from the embedded HDF geometric control table (GCT) metadata. These are arrays of pixel/line locations and their geographic latitude and longitude coordinates. The original HDF metadata file is also provided with an input.xml extension. |
| ASTER Level-1B HDF-EOS + UTM | No change | Geographic | The original ASTER HDF-EOS swath-oriented UTM projection is converted to Geographic projection with single-band HDF-EOS files. Each band has an accompanying metadata file with a .met extension. The original HDF metadata file is also provided with an input.xml extension. |
| ASTER Level-1B HDF-EOS + UTM | GeoTiff | Geographic | The original ASTER HDF-EOS swath-oriented UTM projection is converted to Geographic projection with single-band GeoTiff files. Each band has an accompanying metadata file with a .met extension. The original HDF metadata file is also provided with an input.xml extension. |
| ASTER Level-1B HDF-EOS + UTM | GeoTiff | UTM North-Up | The original ASTER HDF-EOS swath-oriented UTM projection is converted to swath-oriented single-band North-Up UTM GeoTiff files. Each band has an accompanying geolocation text file extracted from the embedded HDF geometric control table (GCT) metadata. These are arrays of pixel/line locations and their geographic latitude and longitude coordinates. The original HDF metadata file is also provided with an input.xml extension. |
| ASTER Level-1B HDF-EOS + UTM | GeoTiff | Polar Stereographic | The original ASTER HDF-EOS swath-oriented UTM projection is converted to Polar Stereographic projection with single-band GeoTiff files. Each band has an accompanying metadata file with a .met extension. The original HDF metadata file is also provided with an input.xml extension. |
| ASTER Level-1B HDF-EOS + UTM | No change | UTM North-Up | The original ASTER HDF-EOS swath-oriented UTM projection is converted to swath-oriented single-band North-Up UTM GeoTiff files. Each band has an accompanying geolocation text file extracted from the embedded HDF geometric control table (GCT) metadata. These are arrays of pixel/line locations and their geographic latitude and longitude coordinates. The original HDF metadata file is also provided with an input.xml extension. |
| ASTER Level-1B HDF-EOS + UTM | No change | Polar Stereographic | The original ASTER HDF-EOS swath-oriented UTM projection is converted to Polar Stereographic projection with single-band GeoTiff files. Each band has an accompanying metadata file with a .met extension. The original HDF metadata file is also provided with an input.xml extension. |
The output files from DP-HEG have an elaborate file naming convention. The following description is designed to provide broad guidelines for interpreting the file names.
| Output | File Name | Description | |
|---|---|---|---|
| HDF-EOS No change in format and projection |
… AST_L1B_00309162003161040_10012003140030.hdf AST_L1B_00309162003161040_10012003140030.hdf.xml AST_L1B_00309162003161040_10012003140030.hdfmet … ConverterSynopsis.txt |
003: Version Number 09162003161040: Acquisition Date & Time (mmddyyyyhhmmss) 10012003140030: Production Date & Time (mmddyyyyhhmmss) | |
| GeoTiff No change in projection |
AST_L1B_00309162003161040_10012003140030.hdf.input.xml … AST_L1B_003091620031_10012003140030_ImageData4_453_5.tif AST_L1B_003091620031_10012003140030_ImageData4_453_5.tif.met AST_L1B_003091620031_10012003140030_ImageData4_453_5_geolocations.txt … AST_L1B_003091620031_10012003140030_ImageData14_453_15.tif AST_L1B_003091620031_10012003140030_ImageData14_453_15.tif.met AST_L1B_003091620031_10012003140030_ImageData14_453_15_geolocations.txt … AST_L1B_003091620031_10012003140030_ImageData3N_453_3.tif AST_L1B_003091620031_10012003140030_ImageData3N_453_3.tif.met AST_L1B_003091620031_10012003140030_ImageData3N_453_3_geolocations.txt … ConverterSynopsis.txt |
input.xml: Input hdf-EOS metadata 453: Unique DP-HEG Identifier Data4 through Data9: SWIR Bands 4-9 Data10 through Data14: TIR Bands 10-14 Data1 through Data3N: VNIR Bands 1-4 ConverterSynopsis.txt: Processing log files | |
| HDF-EOS Geographic | AST_L1B_00309162003161040_10012003140030.hdf.input.xml … AST_L1B_003091620031_10012003140030_ImageData8_452_9.hdf AST_L1B_003091620031_10012003140030_ImageData8_452_9.hdf.met … AST_L1B_003091620031_10012003140030_ImageData13_452_14.hdf AST_L1B_003091620031_10012003140030_ImageData13_452_14.hdf.met … AST_L1B_003091620031_10012003140030_ImageData3B_452_4.hdf AST_L1B_003091620031_10012003140030_ImageData3B_452_4.hdf.met … ConverterSynopsis.txt |
input.xml: Input hdf-EOS metadata 452: Unique DP-HEG Identifier Data4 through Data9: SWIR Bands 4-9 Data10 through Data14: TIR Bands 10-14 Data1 through Data3N: VNIR Bands 1-4 ConverterSynopsis.txt: Processing log files | |
| GeoTiff Geographic | AST_L1B_00309162003161040
_10012003140030.hdf.input.xml … AST_L1B_003091620031_10012003140030_ImageData7_454_8.tif AST_L1B_003091620031_10012003140030_ImageData7_454_8.tif.met … AST_L1B_003091620031_10012003140030_ImageData14_454_15.tif AST_L1B_003091620031_10012003140030_ImageData14_454_15.tif.met … AST_L1B_003091620031_10012003140030_ImageData1_454_1.tif AST_L1B_003091620031_10012003140030_ImageData1_454_1.tif.met … ConverterSynopsis.txt |
input.xml: Input hdf-EOS metadata 454: Unique DP-HEG Identifier Data4 through Data9: SWIR Bands 4-9 Data10 through Data14: TIR Bands 10-14 Data1 through Data3N: VNIR Bands 1-4 ConverterSynopsis.txt: Processing log files | |
2.2 Description of the Results Page Returned from a DP-HEG Search for ASTER Level-1B Data Sets
The following is a description of the icons returned on the "Results" page from an ASTER Level-1B data search.
- Once you initiate the Data Pool client interface, you can employ a drill-down search method to identify granules that meet your spatial/temporal interests (http://e4eil01u.ecs.nasa.gov:22000/WebAccess/helpFrame.html)
- The "Results" page lists 7 columns: Granule, Size, BeginDate, EndDate, BeginTime, EndTime, and Day-NightFlag
 |
Download Granule |
 |
Download Granule using zip compression (*.zip) |
 |
Download Granule using gnu zip compression (*.gzip) |
 |
Download Granule using UNIX compression (*.Z) |
 |
View complete metadata |
 |
View browse file |
 |
View metadata and browse files |
 |
Add granule to Shopping Cart |
 |
DP-HEG Data format and projection conversion utility |
The functionality supported by the last two icons, the shopping cart (
), and the format and projection conversion utility (
), are elaborated in the preceding tables above. Some key points and caveats regarding the DP-HEG functionality include the following:
- Order Thresholds: There are no problems with single-granule orders but multiple-granule orders could pose problems such as failed orders and missing metadata information
- Proliferation of Files: Presently, the upper limit on the number of DP-HEG orders while using the shopping cart is 50 granules. But selecting this upper limit could potentially add over 2,250 individual files in one directory
- System Instability with Large Orders: In light of the above, placing a large order is expected to cause system instability. This is further aggravated by the need to maintain a large number of temporary files, and concurrency in those file names
The format and projection conversion utility ( ) initiates the "Select Conversion Parameters" GUI where you have the opportunity to define format conversion, projection conversion and spatial subsetting functions.
2.3 Default Values Used in the Format and Projection Conversion Utility For ASTER Level-1B Data Sets
The DP-HEG conversion software calculates and uses appropriate default projection parameters for certain combinations of formats and projections. You need to provide values for these fields only if your projection requirements are different. The following table identifies the format and projection combinations for ASTER Level-1B data sets that accept optional alternative user-supplied parameter values.
Note: WGS84 is the default datum used for the projection conversions.
| Format and Projection Combinations | Input Fields |
|---|---|
| HDF-EOS + UTM | Latitude in Zone and Longitude in Zone (Decimal Degrees) |
| HDF-EOS + Polar Stereographic | Central Longitude, Latitude of True Scale, False Easting, False Northing (Meters) |
| GeoTiff + UTM | Latitude in Zone and Longitude in Zone (Decimal Degrees) |
| GeoTiff + Polar Stereographic | Central Longitude, Latitude of True Scale, False Easting, False Northing (Meters) |
2.4 Handling ASTER Bands 3N and 3B
The ASTER bands 3N (nadir) and 3B (backward) have different image dimensions, and presently, they are handled differently in various image processing software packages. The 400-line offset in the band 3B is excluded, however, all the overlapping areas between bands 3N and 3B are present.
2.5 Geo-referencing DP-HEG-derived ASTER Output
Presently, there are problems with some software packages' handling the geo-referencing for an ASTER HDF-EOS format scene that is projected to Geographic. For more information on geo-referencing ASTER Level-1 data, consult the following URL: http://lpdaac.usgs.gov/aster/ASTER_GeoRef_FINAL.pdf
3.0 Using DP-HEG with MODIS Data Products
There are a number of MODIS products derived from both the Terra and Aqua platforms that are available in the Data Pool (http://lpdaac.usgs.gov/datapool/datatypes.asp). Presently, there are 19 MODIS products that are handled by DP-HEG. As additional data products are made available, this section will accordingly be updated. These products include the following:
- MODIS/Terra Surface Reflectance 8-Day L3 Global 500m SIN Grid
- MODIS/Terra Land Surface Temperature/Emissivity Daily L3 Global 1km SIN Grid
- MODIS/Terra Vegetation Indices 16-Day L3 Global 1km SIN Grid
- MODIS/Terra Leaf Area Index/FPAR 8-day L4 Global 1km SIN Grid
- MODIS/Terra Net Photosynthesis 8-Day L4 Global 1km SIN Grid
- MODIS/Terra Land Cover Type Yearly L3 Global 1km SIN Grid
- MODIS/Terra Land Surface Temperature/Emissivity 8-Day L3 Global 1km SIN Grid
- MODIS/Terra Vegetation Indices 16-Day L3 Global 500m SIN Grid
- MODIS/Terra Vegetation Indices Monthly L3 Global 1km SIN Grid
- MODIS/Terra Vegetation Indices 16-Day L3 Global 250m SIN Grid
- MODIS/Aqua Vegetation Indices 16-Day L3 Global 250m SIN Grid
- MODIS/Aqua Surface Reflectance 8-Day L3 Global 500m SIN Grid
- MODIS/Aqua Land Surface Temperature/Emissivity Daily L3 Global 1km SIN Grid
- MODIS/Aqua Vegetation Indices 16-Day L3 Global 1km SIN Grid
- MODIS/Aqua Leaf Area Index/FPAR 8-day L4 Global 1km SIN Grid
- MODIS/Aqua Net Photosynthesis 8-Day L4 Global 1km SIN Grid
- MODIS/Aqua Land Surface Temperature/Emissivity 8-Day L3 Global 1km SIN Grid
- MODIS/Aqua Vegetation Indices 16-Day L3 Global 500m SIN Grid
- MODIS/Aqua Vegetation Indices Monthly L3 Global 1km SIN Grid
The following table describes the various format and projection conversion output options the DP-HEG offers for the 19 Terra and Aqua MODIS Grid products.
Note: Currently MODIS products that cross the International Dateline (180th meridian) or the Poles may produce unreliable results. This is being addressed and will be corrected in the near future.
| Input | Output Format | Output Projection | Description |
|---|---|---|---|
| MODIS Grid Products HDF-EOS + Sin. | No change | No change | The original MOD09A1 HDF-EOS format and Sinusoidal projection are retained and copied to the DP download directory. |
| MODIS Grid Products HDF-EOS + Sin. | No change* | Sinusoidal | The original MOD09A1 HDF-EOS format is retained while converting its projection to Sinusoidal. Each band has an accompanying metadata file with a .met extension. The original HDF metadata file is also provided with an input.xml extension. |
| MODIS Grid Products HDF-EOS + Sin. | No change* | Geographic | The original MOD09A1 HDF-EOS format is retained while converting its projection to Geographic. Each band has an accompanying metadata file with a .met extension. The original HDF metadata file is also provided with an input.xml extension. |
| MODIS Grid Products HDF-EOS + Sin. | No change* | Polar Stereographic | The original MOD09A1 HDF-EOS format is retained while converting its projection to Polar Stereographic. Each band has an accompanying metadata file with a .met extension. The original HDF metadata file is also provided with an input.xml extension. |
| MODIS Grid Products HDF-EOS + Sin. | No change* | UTM | The original MOD09A1 HDF-EOS format is retained while converting its projection to UTM. Each band has an accompanying metadata file with a .met extension. The original HDF metadata file is also provided with an input.xml extension. |
| MODIS Grid Products HDF-EOS + Sin. | GeoTiff* | Sinusoidal | The original MOD09A1 HDF-EOS format is converted to GeoTiff while retaining its projection in Sinusoidal. Each band has an accompanying metadata file with a .met extension. The original HDF metadata file is also provided with an input.xml extension. |
| MODIS Grid Products HDF-EOS + Sin. | GeoTiff* | Geographic | The original MOD09A1 HDF-EOS format is converted to GeoTiff and its projection is converted to Geographic. Each band has an accompanying metadata file with a .met extension. The original HDF metadata file is also provided with an input.xml extension. |
| MODIS Grid Products HDF-EOS + Sin. | GeoTiff* | Polar Stereographic | The original MOD09A1 HDF-EOS format is converted to GeoTiff and its projection is converted to Polar Stereographic. Each band has an accompanying metadata file with a .met extension. The original HDF metadata file is also provided with an input.xml extension. |
| MODIS Grid Products HDF-EOS + Sin. | GeoTiff* | UTM | The original MOD09A1 HDF-EOS format is converted to GeoTiff and its projection is converted to UTM. Each band has an accompanying metadata file with a .met extension. The original HDF metadata file is also provided with an input.xml extension. |
* Except for the original HDF-EOS product in Sinusoidal projection, all other format and projection options will output single band layers with accompanying metadata files.
| Output | File Name | Description | |
|---|---|---|---|
| HDF-EOS No change in format and projection |
… MOD09A1.A2003177.h11v05.004.2003194092334.hdf MOD09A1.A2003177.h11v05.004.2003194092334.hdf.xml MOD09A1.A2003177.h11v05.004.2003194092334.hdfmet … ConverterSynopsis.txt |
A2003177: Acquisition Year/Julian Date h11v05: TileID 003: Version Number 2003194092334: Julian Processing Date & Time (yyyydddhhmmss) | |
| GeoTiff No change in projection |
… MOD09A1.A2003177.h11v05.004.2003194092334.hdf.input.xml … MOD09A1_A2003177_h11v05_004_2003194092334_sur_refl_b01_2885.tif MOD09A1_A2003177_h11v05_004_2003194092334_sur_refl_b01_2885.tif.met … ConverterSynopsis.txt |
input.xml: Input hdf-EOS metadata 2885: Unique DP-HEG Identifier ConverterSynopsis.txt: Processing log files | |
| HDF-EOS Geographic |
… MOD09A1.A2003177.h11v05.004.2003194092334.hdf.input.xml … MOD09A1_A2003177_h11v05_004_2003194092334_sur_refl_b01_2885.hdf MOD09A1_A2003177_h11v05_004_2003194092334_sur_refl_b01_2885.hdf.met … ConverterSynopsis.txt |
input.xml: Input hdf-EOS metadata 2885: Unique DP-HEG Identifier ConverterSynopsis.txt: Processing log files | |
Spatial Subsetting is available for the 19 MODIS Grid products that are handled by DP-HEG. The bounding rectangle of the area to be subsetted is defined in decimal degree coordinates via the Spatial Subsetting Dialog that allows the application of these settings to all applicable granules in the shopping cart and/or making these the default settings. The specified latitude and longitude coordinates of the area to be subset must at least partially intersect the granule or the subsetting operation will not work correctly.
3.2 Description of the Results Page Returned from a DP-HEG Search for MODIS Data Products
The following is a description of the icons returned on the "Results" page from a MODIS MOD09A1 data search.
- Once you initiate the Data Pool client interface, you can employ a drill-down search method to identify granules that meet your spatial/temporal interests (http://e4eil01u.ecs.nasa.gov:22000/WebAccess/helpFrame.html)
- The "Results" page lists 7 columns: Granule, Size, BeginDate, EndDate, BeginTime, EndTime, and Day-NightFlag
|
Download Granule |
|
Download Granule using zip compression (*.zip) |
|
Download Granule using gnu zip compression (*.gzip) |
|
Download Granule using UNIX compression (*.Z) |
|
View complete metadata |
|
View browse file |
|
View metadata and browse files |
|
Add granule to Shopping Cart |
|
DP-HEG Data format and projection conversion utility |
The details in section 2.2 describing the icons and their functionality on the results page are exactly applicable to MODIS products as well. The only difference stems from the list of available options that may uniquely be applicable to MODIS products.
3.3 Default Values Used in the Format and Projection Conversion Utility For MODIS Grid Products
The DP-HEG conversion software calculates and uses appropriate default projection parameters for certain combinations of formats and projections. You need to provide values for these fields only if your projection requirements are different. The following table identifies the format and projection combinations for MODIS Grid products that accept optional alternative user-supplied parameter values.
Note: WGS84 is the default datum used for the projection conversions.
| Format and Projection Combinations | Input Fields | ||
|---|---|---|---|
| HDF-EOS + UTM | Latitude in Zone and Longitude in Zone (Decimal Degrees) | ||
| HDF-EOS + Polar Stereographic | Central Longitude, Latitude of True Scale, False Easting, False Northing (Meters) | ||
| HDF-EOS + Sinusoidal | Central Longitude (Decimal Degrees), False Easting, False Northing (Meters) | ||
| GeoTiff + UTM | Latitude in Zone and Longitude in Zone (Decimal Degrees) | ||
| GeoTiff + Polar Stereographic | Central Longitude, Latitude of True Scale, False Easting, False Northing (Meters) | ||
| GeoTiff + Sinusoidal | Central Longitude (Decimal Degrees), False Easting, False Northing (Meters) | ||
4.0 Ordering Options for ASTER and MODIS Products
The ASTER Level-1B and MODIS Products can be ordered either as individual or multiple granules. The following table provides details on both the options.
| Ordering Options | Description | ||
|---|---|---|---|
| Ordering individual granules | The user picks the product options & supplies user name & eMail address. A confirmation eMail is sent to the user upon completion of request. A notification eMail is sent upon completion of the order. The only exception is in the case of the "No change to HDF-EOS" option, where only the notification eMail is sent to the user. | ||
| Ordering individual granules via Shopping Cart | The user selects granules from the Data Pool and loads them in the Shopping Cart while also picking one product option for each individual granule. All the DP-HEG-processed data files are delivered to the user in a single directory. All relevant details on how and where to retrieve the files from are sent in the confirmation and notification eMails to the user. | ||
| Bulk ordering via Shopping Cart | The user selects granules from the Data Pool and loads them in the Shopping Cart while also picking one product option for all the granules. All the DP-HEG-processed data files are delivered to the user in a single directory. All relevant details are sent in the confirmation and notification eMails to the user. | ||
DP-HEG Users Guide
http://edhs1.gsfc.nasa.gov:8001/edhs1.gsfc.nasa.gov/QuickSearch?515-EMD-002
HDF-EOS Tools and Information Center
General Overview of HDF-EOS
For additional questions or concerns regarding the DP-HEG, contact:
|
LP DAAC User Services U.S. Geological Survey (USGS) Earth Resources Observation and Science Center (EROS) 47914 252nd Street Sioux Falls, SD 57198-0001 |
|
|---|---|
| Phone: | 605-594-6116 |
| Toll Free: | 866-573-3222 |
| 866-LPE-DAAC | |
| Fax: | 605-594-6963 |
| Email: | LPDAAC@eos.nasa.gov |
| Web: | http://LPDAAC.usgs.gov |
| LP DAAC | EROS Home | About | Products | Data Tools | Order Data | News | Help/Edu | Links | Contact Us |
| This site is hosted by the USGS - NASA Distributed Active Archive Center U.S. Government: Public Information Exchange Resource NASA: Privacy Policy and Important Notices USGS: Privacy Statement, Disclaimer, Accessibility, FOIA DOI: Privacy Statement, Privacy Disclaimer, No FEAR Act, FOIA, Performance Plan, Children's Privacy URL: http://LPDAAC.usgs.gov/landdaac/tools/heg/heg_summary.asp Technical Contact: LPDAAC@eos.nasa.gov Last Update: Wednesday, September 26, 2007 Download Adobe Acrobat Reader |
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