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Landsat Missions

USGS LandsatLook Viewer Help Documentation

Introduction
Using the LandsatLook Viewer
Citation and Data Use Policy
Supported Browsers
Contact Information

Introduction

The LandsatLook Viewer is a prototype tool that was developed to allow rapid online viewing and access to the USGS Landsat image archives. This viewer allows you to:

The viewer can be accessed at http://landsatlook.usgs.gov.


Using the LandsatLook Viewer

The upper menu bar of the LandsatLook Viewer provides access to useful documentation and information to help you navigate the site easily (see Figure 1).

Welcome: Displays introductory information about the site.

About: Directs you to a webpage that provides background information about the Landsat archive, and the viewer. It includes links for more details on Landsat, LandsatLook, and Landsat Data Products. Also available on this page is a link to the web-based ArcGIS Image Services.

Quick Guide: Provides a short summary of how to utilize the site.

Contact Us: Allows the user to send comments or questions related to this viewer.

Help: Provides links to detailed Help documentation (this webpage).

Figure 1. LandsatLook Viewer Home

Figure 1. LandsatLook Viewer Home

Search the Landsat Archive

To begin a search, you can enter a location (geographic name) in the text box at the top of the page, or use your mouse to interactively pan and zoom to your area of interest (you can also use the zoom at the right side of the page).

You can also select which Base Map to use. (See the Citation section for descriptions of Base Maps).

The Measure Tool provides area and single line distance measurements, and allows you to see the Latitude/Longitude coordinates of particular areas.

At any time, you can click the Home icon to reset the view and clear all previously selected search criteria.

Figure 2. Interface Features

Figure 2. Interface Features

After you zoom in to an appropriate “searchable” level (1:1,000,000 scale), the green Show Images button becomes visible on the left side (see Figure 3.)

You can also refine your Landsat archive search by selecting additional parameters:

Once you have selected your search parameters, you can click the Show Images button.

Figure 3. Viewer zoomed into an area of interest. The Show Images button is activated.

Figure 3. Viewer zoomed into an area of interest. The Show Images button is activated.

Image Display

The viewer search will return all scenes that meet the selected criteria (see Figure 4).

The total number of scenes returned will appear in the Image Display header. Your search results may include many scenes over a single location, which cannot be displayed simultaneously. Instead, all scenes returned from the search have been stored in a stack for quick retrieval.

You can change the displayed images and scroll through the full stack of images by using the Active Image time slider.

Figure 4. Returned Query

Figure 4. Returned Query

The Image Display area includes the following additional features:

Percent Clip: This enhancement removes the very darkest and lightest colors. This enhancement option can actually change the apparent colors of the image.

Stretch 3 Std Dev: This enhancement computes the average of the image and then reassigns colors based on a calculation of the Standard Deviation. This option tends to brighten the image without changing the colors.

The Export Display function allows you to save a graphic file (“screen-scrape”) of the Landsat image as viewed on the screen. When exporting an image, you will need to select the spatial reference (Web Mercator or WGS84) and preferred image format (JPG, PNG, or TIF). Note: any selected Image Enhancements or Transparency settings will be retained in the exported image.

Metadata and Data Access

The Metadata and Data Access section (Figure 5) allows you to see detailed information about the images (Displayed Images Only) or returned within your original search (All Query Results) in a Table View (Figure 6) or the Browse/Metadata View (Figure 9).

Figure 5. Metadata and Data Access

Figure 5. Metadata and Data Access

The Table View allows you to obtain further information about the images on the list, view browse/footprints/metadata, export display, or submit a request for the full-tile imagery.

When first entering the Table View, you are provided the following options (see Figure 6):

Showing: Provides a drop-down menu to toggle the display (showing Displayed images only, all Query Results, or the Cart)

Export Display: Allows you to save a file of the selected image displayed on the screen (a “screen-scrape”). You can select the spatial reference and the image format of this image. Note: any previously selected Enhancements or Transparencies will be retained in the exported image.

You may select individual scenes, or use the left column box to select all scenes in the list.

Figure 6. Query Results Table View: Displayed Images Only

Figure 6. Query Results Table View: Displayed Images Only

After selecting at least one scene, the following options become available (see Figure 7):

Zoom To: Displays the selected scenes on the viewer.

Show Footprint: Draws the footprint coverage of the selected scenes on the viewer.

Show Metadata: Displays the selected scenes in the Browse/Metadata view. (Figure 9)

Add to Cart: Places the selected scenes into the Shopping Cart. (Figure 10)


Figure 7: Selected Scene in Table View

Figure 7: Selected Scene in Table View

If you Zoom To or Show Footprint of the selected scene(s), another button appears: Set As Display (Figure 8). Clicking this changes the display to show only the selected scenes.

Figure 8:  Set As Display Button in Table View

Figure 8: Set As Display Button in Table View

Selecting the Browse/ Metadata button creates a popup box that contains the browse images and associated metadata for each selected scene. Use the arrows to page through all of the scenes. (Note: Night scenes may also display in the Metadata box. These can be added to the Cart, but will not be displayed in the Landsat Viewer map interface.)

You can use the Show Footprint and the Zoom To buttons to show the scenes on the main Viewer display. You can also place scenes into the cart (Add to Cart) and access the cart (View Cart) from this window.

Figure 9. Browse/Metadata Display Box

Figure 9. Browse/Metadata Display Box

View Cart and Access Data

The LandsatLook Viewer also supports download access for the full-band image source imagery contained within the Landsat archive. A Shopping Cart can be created and submitted from the LandsatLook Viewer interface. All image requests are managed and delivered via the USGS EarthExplorer interface.

The Add to Cart button is displayed on both the table and browse/metadata views, and places the selected scenes into the Shopping Cart. These items will remain in the Cart while additional queries are done, and other scenes may also be selected.

You can access the Cart by clicking on the View Cart button (browse/metadata view) or changing the Table view to Showing: Cart.

The Cart displays all scenes in the shopping queue. When scenes are selected (using the left column check boxes), the following options are activated (see Figure 10):

Remove from Cart: Removes selected scene.

Export Image: Allows you to save a file of the selected image seen on the screen (a “screen-scrape”). You can select the spatial reference and the image format of this image. Note: any selected Enhancements or Transparencies will be retained in this image.

Get LandsatLook Image: Allows you to download the LandsatLook Image with Geographic Reference (see http://landsat.usgs.gov/LandsatLookImages.php for details about this file).

Get Landsat Data: Prompts you to log into the EarthExplorer interface to access the full Landsat Level 1 data product options. (See this page for the files you will receive with the Level 1 data product: http://landsat.usgs.gov/files_will_be_provided_with_a_Landsat_scene.php.) If you do not have a USGS login, you can Register from the EarthExplorer page (see Figure 11).

Figure 10. LandsatLook Viewer Cart Display

Figure 10. LandsatLook Viewer Cart Display

Figure 11. EarthExplorer login page

Figure 11. EarthExplorer login page

After downloading the LandsatLook Image or the Landsat Data, the scenes will remain selected in the Cart. You can click Remove from Cart to remove them.


Citation Information and Data Use Policy

Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

Technical Attribution

The LandsatLook Viewer uses ArcGIS Server technology. For more information: http://www.esri.com/software/arcgis/arcgisserver.

Basemaps

Imagery-Source: esri
For more information:
http://services.arcgisonline.com/arcgis/rest/services/World_Imagery/MapServer

Shaded Relief World Topographic Basemap
For more information:
http://services.arcgisonline.com/arcgis/rest/services/World_Shaded_Relief/MapServer

National Geographic Basemap: National Geographic World Map
For more information:
http://services.arcgisonline.com/arcgis/rest/services/NatGeo_World_Map/MapServer

Landsat Images

There are no restrictions on the use or redistribution of Landsat images received from the U.S. Geological Survey. The following statement should be used when citing, copying, or reprinting Landsat imagery or data: Data available from the U.S. Geological Survey.

The USGS Visual Identity System Guidance webpage (“Acknowledging or Crediting USGS as Information Source”) provides additional details: http://www.usgs.gov/visual-id/credit_usgs.html.


Supported Browsers

The current version of the LandsatLook Viewer has been developed and tested using Firefox (33.0) and Google Chrome ((37.0.2062.124). Internet Explorer 10 has also been used for some testing. Note that not all combinations of operating systems and plug-ins or add-ons have been tested.

The LandsatLook Viewer may also work in other browsers, but has not been tested.

The highest available browser version is always recommended.


Contact Information

Questions or feedback related to the LandsatLook Viewer can be directed to USGS EROS Customer Services: http://landsat.usgs.gov/contactus.php?topic=llook

USGS Customer Services
Earth Resources Observation & Science (EROS) Center
(605)-594-6151
1-800-252-4547
custserv@usgs.gov
Available M-F 8 am to 4 pm (Central U.S. time)

Content Last Revised: October 31, 2014

























































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Page Last Modified: 11/14/14 08:48 am
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