Science Technology
Science Technology
What restrictions are in place to protect citizens' civil liberties and privacy concerns related to uncrewed aircraft systems?
The USGS is a bureau within the Department of the Interior (DOI), which requires the following actions related to privacy: Operating uncrewed aircraft systems (UAS) primarily over DOI lands. Obtaining written permission from landowners when UAS operations need to launch and/or land on their property. Following standard Federal Aviation Administration (FAA) and DOI-approved procedures for aircraft...
What training do pilots of USGS uncrewed aircraft systems receive?
Training for USGS uncrewed aircraft system (UAS) operators is provided by the Department of the Interior Office of Aviation Services . The training has been approved by the Federal Aviation Administration and is specific to the types of UAS that the department operates. The training provides operators with the skills and knowledge necessary to operate a small UAS in the National Airspace System.
What types of uncrewed aircraft systems does the USGS use?
The Department of the Interior and USGS uncrewed aircraft systems (UAS) operational strategy emphasizes small systems with a combined aircraft and payload weight of less than 55 pounds. These small UAS are designed to support short (90 minute) missions and operate on rechargeable batteries or gasoline. This strategy recognizes that any given small UAS model will have a limited life span based on...
Why does the USGS use uncrewed aircraft systems?
Uncrewed aircraft systems (UAS) provide an affordable solution when the USGS needs "eyes in the sky" but doesn’t have the budget to maintain a fleet of aircraft or to obtain commercial imagery. The USGS relies on a variety of remotely sensed data. UAS can provide a range of remote sensing data types, from aerial images to hyperspectral or Synthetic Aperture Radar (SAR) data at resolutions down to...
How does the USGS use uncrewed aircraft systems?
The USGS National Uncrewed Systems Office (UAS) and the Office of Aviation Services are leading the development and testing of UAS scientific and resource management technology across the Department of the Interior in coordination with the other bureaus. Department of the Interior UAS capabilities support a range of activities including scientific research, monitoring environmental conditions...
Can Landsat satellite acquisition requests be made for a specific date and location?
The Landsat 8 and Landsat 9 satellites together acquire approximately 1,500 scenes daily. These scenes are available for download within 6 hours of acquisition. Landsat satellite acquisitions are managed as a system, known as a satellite constellation. Long-Term Acquisition Plans (LTAPs) direct and optimize the daily acquisitions of each active Landsat satellite. Special requests for future...
What is Landsat 7 ETM+ SLC-off data?
Landsat 7 ETM+ SLC-off data refers to all Landsat 7 images collected after May 31, 2003, when the Scan Line Corrector (SLC) failed. These products have data gaps, but are still useful and maintain the same radiometric and geometric corrections as data collected prior to the SLC failure. See the Landsat 7 website for information about the SLC-off data products.
What is remote sensing and what is it used for?
Remote sensing is the process of detecting and monitoring the physical characteristics of an area by measuring its reflected and emitted radiation at a distance (typically from satellite or aircraft). Special cameras collect remotely sensed images, which help researchers "sense" things about the Earth. Some examples are: Cameras on satellites and airplanes take images of large areas on the Earth's...
How do I open Landsat satellite data files?
Many image processing programs (ERDAS IMAGINE®, PCI Geomatica®, ENVI®, IDRISI®, etc.)* can import a variety of image formats, including the GeoTIFF files of Landsat data. Free Multispec software that is included with the USGS lesson plan Tracking Change Over Time can be used for limited spectral analysis. To view Landsat scenes without using specialized software, download the LandsatLook images (...
What are some known issues that users might find in Landsat data?
A number of artifacts and anomalies can happen to any remote sensing data. Banding, dropped scan lines, and detector failures are only a few of the anomalies that can be seen in Landsat data. Go to Landsat Known Issues for details about anomalies that have been discovered and investigated.
Why is there so much color variation among the Landsat browse images?
A custom color stretch is performed on the images, based on individual scene content. Scenes from within the same area and/or acquisition date might vary in band content (due to differences such as cloud content or ground moisture). This differing content will cause variation in the results of the color stretch. Pixelation is an artifact of the browse generation process and is common for scenes...
After a Landsat scene is collected, when will it become available for search and download?
Landsat scenes directly downlinked to the USGS EROS Landsat Ground Station become available through EarthExplorer within 6 hours after acquisition, and then become visible in GloVis and the LandsatLook Viewe r within 24 hours. Scenes downlinked to other USGS Ground Stations can be available within 1 to 2 weeks. Scenes downlinked to International Ground Stations may become available in the USGS...