The Landsat program is one of the oldest programs for the creation and operation of space systems for remote sensing of the earth. The first Landsat satellite was launched in 1972, the last Landsat-8, was launched on February 11, 2013.
|
System |
Launch |
Camera |
Resolution |
Transmission system |
Height (km) | Repeat shooting | Speed Mbit / sec |
|---|---|---|---|---|---|---|---|
| Landsat 1 | 23.07.72 | RBY MSS | 80 80 | прямая передача | 917 | 18 | 15 |
| Landsat 2 | 22.01.75 | RBY MSS | 80 80 | прямая передача | 917 | 18 | 15 |
| Landsat 3 | 05.03.78 | RBY MSS | 30 80 | прямая передача | 917 | 18 | 15 |
| Landsat 4 | 16.07.82 | MSS TM | 80 30 | TDRSS | 705 | 16 | 85 |
| Landsat 5 | 01.03.84 | MSS TM | 80 30 | TDRSS | 705 | 16 | 85 |
| Landsat 6 | 10.05.93 | ETM | 15 (pan) 30 (ms) | прямая передача | 705 | 16 | 85 |
| Landsat 7 | 15.04.99 | ETM + | 15 (pan) 30 (ms) | прямая передача и ЗУ | 705 | 16 | 150 |
Satellite images obtained by the Landsat-7 spacecraft are characterized by a wide capture band (185 km), the presence of multispectral images (8 spectral channels) and a relatively high resolution panchromatic channel (15 m). Today, the global archive of Landsat-7 images contains coverage of almost the entire surface of the Earth, with some regions captured multiple times.
Landsat images have a larger number of color ranges, which allows their spectral analysis to solve many problems. Thus, the ETM+ survey equipment installed on Landsat-7 has eight spectral ranges, which are characterized by:
- blue-green band- depth measurement (sea), differentiation of soil from vegetation, as well as deciduous forests from coniferous-resolution of 30 m;
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green stripe-accentuates the highest point of vegetation-30 m resolution;
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red stripe-distinguishes vegetation slopes-30 m resolution;
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reflecting IR radiation-accentuates the biomass content and shorelines with a resolution of 30m;
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reflecting IR radiation-highlights the assessment of the moisture content in the soil, vegetation, penetrates through a slight cloud cover-a resolution of 30 m.;
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thermal-IR band-used for shooting in the IR range and for assessing humidity-resolution of 60 m;
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IR-reflecting band-mapping of altered hydrothermal rock formations associated with mineral deposits-resolution of 30 meters;
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thermal-IR band-used for shooting in the IR range and for assessing humidity-resolution of 60 m;
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black and white stripe-increases the sharpness of color images-resolution of 15 meters.
On May 31, 2003, a malfunction occurred on Board the Landsat-7 satellite. It was caused by a failure of the Scan line Corrector (SLC). The malfunction was irreversible, but nevertheless, Landsat 7 ETM + continued to shoot in "SLC-off" mode. To solve this problem and provide consumers with new shooting materials, a new product "SLC-off" was developed. This product is created by replacing all missing image pixels from previously obtained Landsat-7 satellite images with approximate values derived from jointly registered, histogram - compatible SLC-on frames.
Innoter is ready to pick up Landsat-7, 8 satellite images for the territory you need. The technology developed by the company's specialists and widely used in practice, allow you to update digital topographic maps at scales of 1:200000 and smaller based on Landsat-8 images.
Applications of the Landsat-7 satellite:
Good visual properties of Landsat-7 multispectral images provide high-quality topographical map updates for the following categories: hydrography, road network, erosion and gully-beam network, contours and types of swamps, contours and types of woodlands, forest belts, and agricultural land. The results of decoding multispectral survey materials can also be presented as thematic maps (vegetation, hazard, disturbance of the territory, soil cover, etc.) of scales 1:100 000, 1:200 000 and 1:500 000, or as layers of geoinformation systems for various purposes.