Select Sensor: TerraLook

This menu is used to switch between the TerraLook sensors. GloVis also offers several products besides TerraLook collections, and you may order them as well. Please be aware that many of the other products, including the source ASTER data, may involve a product cost. However, Tri-Decadal Global Landsat Orthorectified data are available for Web-enabled download. Each type of product is handled appropriately by the shopping basket. If you intermix TerraLook and other products in your order, please carefully check the order summary.

Options:
TL Tri-Dec MSS (circa 1975)
TL Tri-Dec TM (circa 1990)
TL Tri-Dec ETM+ (circa 2000)
TL ASTER VNIR (2000 to present)

Navigation:

The arrow keys are useful for moving around in a local area. Clicking on the map permits you to quickly move to distant locations.

To move around, use one of the following options:

(1) Click in the small world map.
(2) Enter the path/row or latitude/longitude coordinates.
(3) Use the arrow keys to move through the browse images.
(4) Click-drag using the mouse

Resolution:

Choosing a lower spatial resolution displays more images with smaller footprints for a larger area. Doing so also tends to slow down the display process because many image files must be accessed. Conversely, choosing a higher spatial resolution displays fewer images with larger footprints for a smaller area. A good compromise is to select 1,000-meter resolution for Landsat and 450-meter resolution for ASTER image display.

LT Tri-Dec MSS and TM (1,000 m and 240 m)
LT Tri-Dec ETM+ (1,000 m and 240 m)
ASTER (1,000 m, 400 m, and 155 m)

Map Layers:

Most map layers are self-explanatory. The "Scene List Overlay" option controls the highlighting of the images. The "Configure Scene List Overlay" option allows you to turn off highlighting for the different sensors. The "Modify Colors" option allows you to change the color of map layers.

Political boundaries, transportation arteries, cities, and protected areas layers can be displayed to help you locate your area of interest.

Max Cloud Percent:

The cloud cover drop-down list allows you to restrict the displayed browse images to only those that meet specific cloud cover criteria. This helps restrict the number of ASTER images selected, but may also risk confusing clouds with other features. When in doubt, set the Maximum Cloud Percentage to 100.

0% to 100%

Scene Information:

The description of the selected image is highlighted in yellow.

The selected image is highlighted in yellow.
The cloud cover value is provided as a percentage.
Date (Year/Month/day) is the acquisition date for the chosen image.

Flip Through Date: Month/Year/Date

For the Tri-Decadal Global Landsat Orthorectified datasets, the “best” image was selected for each location and epoch. However, ASTER may offer many images for each location.

Only one Tri-Decadal Global Landsat Orthorectified image exists for each location for any single date.

Scene List:

If you click on an item in the scene list, GloVis automatically moves to the corresponding image and highlights it in yellow.

By using the option key (MS Windows) or command key (Apple) while clicking on an image name, additional options become available.

The scenes selected are highlighted in green
"Add" to add images to the scene list
"Delete" to remove images from the scene list
"Order" to move all the images from the scene list to the shopping basket

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Ordering Scenes

You may move up to 50 images to the shopping basket in a single order. If you require more than 50 images from the same sensor in a collection, you may select and order multiple 50-image segments. The final product is delivered in one zip file that could be very large.

Collection size: The maximum size of a collection depends on practical download times and zip file limitations.

Estimated delivery time for an order is usually less than 3 hours, but it will depend on system load and access to source data.

To order a TerraLook collection, return to each sensor and click on "Order" to move the selected scenes to the shopping basket. As you "order" scenes for each sensor, the green highlights for that sensor will disappear. The disappearance of all the green highlighted image footprints indicates that all the selected images for each of the sensors are in the shopping basket.

The first time you click "Order," the Registration window will open.
Select either "Guest" or "Registered User":
Guest: occasional GloVis user
Registered User: frequent GloVis user

Open the shopping basket as a Guest or Registered User. The USGS Shopping Basket will open with instructions and information regarding your order.

Shopping Basket

You will need to cycle between GloVis and the shopping basket until all selected images for each sensor are moved to the shopping basket.

Once all selected images are in the shopping basket, continue on to check out.

Check out

On the address page, there are many mandatory fields, but one is especially critical: your e-mail address. If your e-mail address is wrong, we will be unable to inform you when the collection is ready.

You will receive an e-mail confirmation. Please print the receipt for your records. A critical piece of information is the "order number" that we use to investigate problems with your order.

An email will be sent to you when your ordered collection is created. That email contains the Web location where your order is staged, and instructions on how to use the FTP process to retrieve your collection.

Your TerraLook collection is assembled in one zip file. Both the size of the zip file and delivery time will vary. Typical TerraLook image sizes (for a single scene) are:
Landsat MSS: 4 MB
Landsat TM: 14 MB
Landsat ETM+: 14 MB
ASTER: 5.5 MB

For example, the size of a collection containing 2 Landsat MSS, 2 Landsat TM, 2 Landsat ETM+, and 9 ASTER images will be about 113.5 MB. This estimate can vary by 25 percent depending on image texture.