Presentation and options Dialog box of the application
Syntax

Presentation and options

This program transforms data from several satellite sensors (e.g., Enhanced Thematic Mapper Plus, EMT+, Thematic Mapper, TM, Multispectral Scanner System, MSS, etc) of the Landsat series in the NDF format (NLAPS Data Format) of the United States Geological Survey (USGS) as specified in the documents:

"NATIONAL LAND ARCHIVE PRODUCTION SYSTEM (NLAPS). SYSTEMATIC FORMAT DESCRIPTION DOCUMENT". United States Geological Survey Format Specifications for Geometrically Corrected Landsat Level 1 Digital Data Products (July 2000)

"Level 1 Product Output Files. Data Format Control Book". Volume 5, Book 2. Revision 5. April 2001

The images are converted to MiraMon IMG format, so the different spectral bands are stored in as many IMG files as spectral bands are present in the source file. All the converted IMG files are stored in the same directory, so the user is asked to enter a directory name rather than a target file name for each spectral band. The program also compresses the images into a RLE extracompressed and indexed format.

The names of the IMG files that will contain the different spectral bands are assigned according to the following pattern: orbit&image_date_Nband.img. An example could be: 197031_13062002_1 corresponding to the orbit 197, image 031, taken 13 June 2002 in spectral band 1 (blue).

In case of floating (along path) images, the NDF heading files indicate the scene of beginning and end with a decimal figure. This information is used to obtain the scene number identifying of the scene, from the average rounded to integer of the initial and final scene number.

For instance, if the Report file (*.WO) says:

   Path/Strip no.:     197                        Start Row no.:      030.9
                                                  End Row no.:        031.9
the names of the different bands will follow the pattern: 197031_13062002_31.

The metadata contained in the files that are usually found on a distribution CD-ROM, like, for example, the date and hour of acquisition, preprocessing details, etc, are stored in the I.rel file in the same directory where the images are stored. This multiband metadata file distinguishes between the data specific to each band (such as the spectral range covered), the data common to all bands (like the acquisition date) and those data which relate to both (like for instance the number of columns and rows, which is the same for all the multispectral bands but that is usually double for the panchromatic band of ETM+ images, and is recorded in the I.rel metadata file).

The different bands are found in the metadata file in in spectral order, from short to long wavelengths. Examples:

* ETM+ and TM

- First the PAN image (band 8), as it has the highest spatial resolution and is unique in the set. This band is only available in ETM+ imagery.

-Then the bands 1-2-3-4 that provide the spectral response in the ranges blue - green - red - near infrared.

-Then the bands 5-7, that provide the response in the short wave infrared spectral region.

- Finally, band 6, corresponding to the thermal infrared that has a resolution of 60 m in ETM+ and 120 m in TM, but that is distributed resampled to 30 m. In the case of ETM+ images, sometimes these are distributed with an additional band 9, corresponding to the thermal channel but with a high gain radiometric calibration.

* MSS
- The bands 1-2-3-4-5 that provide the spectral response in the ranges green - red - near infrared 1- near infrared 2 - thermal. Band 5 is only available with the mission Landsat-3 of the MSS sensor.
The Universal MiraMon Metadata Manager (GeM+) may be used to make any changes or minor modifications as needed after importing the images.

Dialog box of the application
NDFIMG dialog box

Syntax

Syntax:

Parameters:

Modifiers: