Landsat 7

Long name	Landsat data set
Short name	LDC7
Sensor type	Optical
Platform	Landsat 7 ETM+
Key file name (use to open data set)	_MTL.txt or _MTL.xml for Collection 2
Supported file extensions	.txt, .tif, .xml for Collection 2
Sections	Data product name and description Distribution disk files Returned data for supported format References

Data product name and description

Note: The information provided herein is based on the data distributor's documentation cited under References.

Sensor	Spectral bands: Spectral range (nm)	Spatial resolution (m)* (spectral resolution)	Notes
PAN	520 - 900 (Panchromatic)	15	185 km swath width
MS	450 - 520 (Blue) 520 - 600 (Green) 630 - 690 (Red) 770 - 900 (NIR) 1550 - 1750 (IR) 2090 - 2350 (SWIR)	30	185 km swath width
TIRS	10400 - 12500 (Thermal)	30	185 km swath width

* Resolution is always nadir position unless noted otherwise.

Landsat 7 image data is available in three processing levels:

Level 1G/1GS
Level 1GT
Level 1T/1TP

Processing level	Horizontal accuracy (m)	Description/notes
L1G/1GS	N/A	Corrected systematically for ground.
L1GT	N/A	Corrected systematically for ground and terrain.
L1T/L1TP	N/A	Corrected for ground and terrain.

Distribution disk files

A Landsat 7 data set is organized in a specific folder structure on disk. GDB uses this folder structure and the file names to identify the data product type.

Warning: Data sets for this sensor are organized in a specific folder structure on disk. GDB uses this structure and the file names to identify the data product type. Do not alter the folder structure or any file names prior to data ingestion to ensure the image data and auxiliary information are imported correctly.

In CATALYST Professional programs, such as Focus, you can open a Landsat 7 data set in the File Selector window by selecting the *_MTL.txt file or the *_MTL.xml file for Collection 2.

When opening a Landsat 7 data set, the files read by GDB are as described in the following table.

File name	Format	Required	Contents/details
_MTL.txt or _MTL.xml for Collection 2	Text	Yes	Key file name. Use this file to open the data set.
*.TIF	GeoTIFF	Yes	TIFF image file. Contains imagery information.
*_ANG.txt	ASCII	No	Angle-coefficent file that provides model coefficients of the sensor-viewing angle. With this file, you can create angle bands and compute solar and sensor-viewing angles per pixel.

Returned data for supported format

Landsat 7 data can be opened directly in its raw vendor format or imported into a PCIDSK (*.pix) file using the key file name. For optimal processing, use the PCIDSK format. The data structure, after it is opened by GDB, is as described in the following table.

Data product	Data returned	Details
Landsat 7 15m PAN	1 x [8U] raster channel 1 x [ORB] orbit segment (L1G only) 2 x [TEX] text segments	Panchromatic band. Metadata (_MTL.txt) file Angle Coefficient (_ANG.txt) file
Landsat 7 30m MS	6 x [8U] raster channels 1 x [16U] raster quality channel 1 x [ORB] orbit segment (L1G only) 2 x [TEX] text segments	Blue, Green, Red, NIR, IR, SWIR, Quality bands. Note: Quality band is only available for Collection 1. Metadata (_MTL.txt) file Angle Coefficient (_ANG.txt) file
Landsat 7 30m TIRS	1 x [8U] raster channel 1 x [ORB] orbit segment (L1G only) 2 x [TEX] text segments	Thermal band. Metadata (_MTL.txt) file Angle Coefficient (_ANG.txt) file
Landsat 7 30m Quality (Collection 1+)	4 x [8U] raster channels 2 x [BIT] bitmap segments 2 x [TEX] text segments	Quality band. Metadata (_MTL.txt) file Angle Coefficient (_ANG.txt) file
Landsat 7 Collection 2 Level 1 30m MS and Thermal	11 x [8U] raster channels 2 x [16U] raster channels 4 x [16S] raster channels 16 x [BIT] bitmap segments 2 x [TEX] text segments	Blue, Green, Red, NIR, SWIR (2), Thermal (2), Quality, Radiometric Saturation and Dropped Pixel QA, Angle (4) bands. 3 Confidence bands. Fill, Dilated Cloud, Cloud, Cloud Shadow, Snow, Clear, Water, Data Saturation (8), Dropped Pixel bands. Metadata (_MTL.xml) file Angle Coefficient (_ANG.txt) file

References

For more information, visit: landsat.usgs.gov