Task: Download three Landsat 8 satellite data for the dates 24 May 2019, 27 July 2019 and 28 August 2019 covering our case study area - Miandoab irrigation scheme.
Landsat program is the longest-running program for acquisition of
satellite images of Earth (USGS/NASA project). Landsat 1 was launched in
July 1972 and the most recent satellite (Landsat 8) was launched in
February 2013, Landsat 9 is expected to be launched in January 2021.
Landsat 8 has two instruments on board: the Operational Land Imager
(OLI) for optical bands and the Thermal Infrared Sensors (TIRS) for
thermal bands. Optical bands of Landsat 8 imageries have a spatial
resolution of 30 m and a revisit time of 16 days.
The main archive of Landsat satellite (all missions – TM/ETM/OLI) is earth explorer website.
First step is to create user login for this website so that you are able to download the data.
Let us now search and download data for Miandoab irrigation System (see Figure 1) for the time period January to December 2019.
Figure 1: Location of the Miandoab Irrigation scheme and Landsat tile covering the scheme
In the “Search Criteria”, under the “Geocoder” card, select your “Path/Row” - 168/034 as Geocoding Method.
Click on the result (red box) and a location popup will appear over on the map on the right panel.
Figure 2: Setting the search criteria
Now enter the date range for which data is required in the same tab.
Figure 3: Setting the date range
Select the datasets you want to search and set the additional criteria of those data with cloud cover less than 20%.
we are selecting only Landsat 8 data. For previous years you can also
try with Landsat 7 ETM, and Landsat 4/5 TM. Finally click the “Results”
to see list of all available data with our conditions met for the study
area in the given period of time.
Figure 4: Setting additional criteria and listing results
An explanation on different levels and collections of Landsat data is given here.
Check the listed scenes using browse images, select and download only the 168/034 scene.
Figure 5: List of available Landsat 8 data for the given period of time.
Figure 6: Preview image of a Landsat scene
Figure 7: Landsat download options, select the one highlighted
the list of options download the “Level-1 GeoTIFF Data Product” to get
all the spectral bands and metadata of the scene. Please note the file
size: about 900 MB (make sure your internet connection is stable and
foresee sufficient time for download).