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GEOG 121 Project 4: Finding Landsat Data. Presented by: Dan LaSota Greg Stricker Weiqiang Lin. About Landsat: Purpose. The Landsat Program is established to acquire remote sensing imagery of the earth for monitoring and managing the Earth's resources.

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Geog 121 project 4 finding landsat data

GEOG 121 Project 4:Finding Landsat Data

Presented by:

Dan LaSota

Greg Stricker

Weiqiang Lin

About landsat purpose
About Landsat: Purpose

  • The Landsat Program is established to acquire remote sensing imagery of the earth for monitoring and managing the Earth's resources.

  • Applications include: agriculture, geology, forestry, regional planning, education, national security and global climate change research.

  • Landsat 7 is the most recent NASA satellite among 6 others that have produced a continuous multispectral record of the Earth's land surface for 32 years now.

  • Special Emphasis on: Currency, accuracy, affordability and public accessibility of Landsat Data.

  • It is used across disciplines to achieve improved understanding of the Earth's land surfaces and the impact of humans on the environment.

About landsat brief history
About Landsat: Brief History

  • NASA initiated an Earth Resources Survey (ERS) Program 1965 to develop methods for remote sensing of earth resources from space.

  • First Earth Resources Technology Satellite (Landsat 1) launched in 1972 with two Earth-viewing sensing systems

    • a return beam vidicon (RBV) – discontinued after Landsat 3 and

    • an 80 meter multispectral scanner (MSS).

  • Original MSS measures radiation within four narrow bands that span visible green wavelengths, visible red wavelengths, and slightly longer, near-IR wavelengths.

  • Landsat 4 launched in 1984 with the MSS and the Thematic Mapper (TM) featuring higher spatial resolution (30 meters) and improved spectral sensitivity (7 bands, including visible blue, two mid-infrared, & thermal infrared wavelengths).

  • The Landsat 7 Enhanced Thematic Mapper Plus (ETM+) Sensor was launched in Apr 1999, with improved resolution and precision, necessitated by the high costs of imaging, Land Remote Sensing Policy Act (1992) and the loss of Landsat 6.

  • Landsat is a tri-agency joint program of NASA, NOAA and the USGS.

About landsat satellite characteristics
About Landsat: Satellite Characteristics


About landsat how it works space segment
About Landsat: How it works? Space Segment

  • The ETM+ sensor onboard the spacecraft obtains data along the ground track at a fixed swath (185 km in width).

  • The orbit of Landsat 7 is repetitive, circular and near polar at a nominal altitude of 705 km (438 miles) at the Equator.

  • The spacecraft completes just over 14 orbits per day, covering the entire Earth between 81 degrees N & S latitude every 16 days.

  • A multispectral data set having high (30 meter) & medium to coarse (250 to 1000 meter) spatial resolution is acquired on a global basis repetitively.


About landsat how it works ground segment
About Landsat: How it works? Ground Segment

  • Segment consists of both Landsat 7 unique components as well as institutional services. Some examples:

    • Landsat 7 Unique Components

      • Landsat Ground Station LGS, located at EDC, in Sioux Falls, SD is a receive site for the wideband X-Band downlinksof payload data from the space vehicle.

      • In addition to LGS, the Alaska Ground Station & the Svalbard Norway Ground Station receive payload data downlinks.

      • International Ground Stations are satellite data receiving stations located worldwide. They receive, process, & distribute services.

    • Institutional Services

      • Landsat Ground Networkprovides communication support.

      • Space Network – relay services

      • NASA Integrated Support Network – supports Institutional Services

About landsat products
About Landsat: Products

  • Level 0R Product: an essentially raw data form that is marginally useful prior to radiometric and geometric correction.

  • Level 1R product is a radiometrically corrected 0R product. 1R product & 0R at input level have identical geometry.

  • The 1G product is available to users and is a radiometrically and systematically corrected 0R image.

    • Can be processed by LPGS or NLAPS

    • Geometrically rectified for sensor/satellite/terrestrial distortions

    • Scene rotated, aligned, & georeferenced to a user-defined map projection.

    • Earthexplorer always utilize the low gain LMAX value when scaling the radiance of a scene so that all pixels saturate at the same radiance.

  • Others: 1P (precision corrected), 1T (terrain corrected), SLC-off Products

About landsat distribution
About Landsat: Distribution

  • Landsat 7 data distribution system will provide access to Landsat 7 Level 0R data products within 24 hours of collection, and

  • Level 1 processed products within 48 hours of request.

  • Media:

    • Exabyte tape

    • CD-ROM or

    • Electronic transfer via FTP

  • Imagery of foreign land masses will be recorded to EDC at Sioux Falls, yet the temporal depth will be a fraction of what's available at the international ground stations.

What is slc off
What is SLC-off?

  • An instrument malfunction occurred onboard Landsat 7 on May 31, 2003. The problem was caused by failure of the Scan Line Corrector (SLC), which compensates for the forward motion of the satellite.

  • The center of a SLC-off data product is very similar in quality to previous Landsat 7 data. However, the scene's edges will contain alternating scan lines of missing data or duplicated data.

  • As of 5/10/2004, product is in 1G form and has the gap areas filled with Landsat 7 data acquired at a similar time of year prior to the failure.

  • EDC has reduced the price of Landsat 7 ETM+ SLC-off scenes from $600 to $250.

Using landsat data a digression from slc off
Using Landsat Data… A Digression from SLC-off

How to do project 4 generating landsat image

How to do Project 4 Generating Landsat Image

To find coordinates:

To generate Landsat Image:

Click on “Enter as: Guest”

Click on “Enter Coordinates” to do so in Decimals/DDMMSS

Under Data Set Selection, check the box for

“ETM+ SLC-off (Landsat 7, Jul 2003 – Present)

Click “Continue”, then “Search” on the following page

When the search is completed, click on the Data Set

“ETM+ SLC-off (Landsat 7, July 2003 - present)”

How to do project 4 creating the report
How to do Project 4 Creating the Report

  • Click on the “Show” button, under the column “Preview Image”, that corresponds to the smallest amount of cloud cover and the most recent image.

  • Right click to Save Picture As (e.g. jpg) for Project 4.

  • Click on the “Show” button under “Show All Fields” for your image to show metadata.

  • Hyperlink the metadata to Project 4 - OR

    • Click on File and choose “Properties”

    • Copy the URL for the metadata

  • Create new page for metadata using Microsoft Frontpage

    • Upload it to Pass Explorer

    • Provide a link in Project 4 to this Metadata Page.

How to do project 4 answering the questions
How to do Project 4 Answering the Questions

  • Note Scene Acquisition Date for the image you have selected.

  • The World Reference System (WRS) indexes orbits (paths) and scene centers (rows) into a global grid system, comprising 233 paths by 248 rows.

  • The standard WRS scene as defined for Landsats 4 and 5 was preserved as a product for Landsat 7.

  • A path distance of 90 kilometers before and after a WRS center point defines the standard scene length of 180 km (includes 20 scans of overlap) The standard WRS scene overlaps neighboring scenes along a path by 5% at the equator and has a width or cross track distance of 185 kilometers.

  • Definitions

    • The term row refers to the latitudinal center line across a frame of imagery along any given path.

    • The intersection of rows and paths produces the nominal scene center for that landsat image

    • The path/row numbers do not coincide with latitudes 90° north and south.

How to do project 4 answering the questions1
How to do Project 4 Answering the Questions

How to do project 4 answering the questions2
How to do Project 4 Answering the Questions

  • Location and Extent of the Scene

    • Coordinates of the NW, NE, SW and SE corners can be found in the metadata

  • Cost of actual Landsat scene that corresponds to the free browse image:

    • USGS Landsat ETM+ : $600.00 for first scene

    • USGS Landsat ETM+ SLC-Off : $250.00 for first scene



  • NASA Landsat Program (2004)

  • Landsat 7 Science Data Users Handbook (2004)

  • U.S. Census Bureau (2000)

  • USGS Earthexplorer (2004)

  • USGS Landsat Project (2004)

  • Esri Online Campus (2004)