TerraLook: Satellite Imagery to View a Changing World
TerraLook collections are ordered through the USGS Global Visualization (GloVis) Viewer. GloVis allows you to easily step through the three Tri-Decadal Global Landsat Orthorectified epochs and the ASTER inventory to select images for inclusion in a TerraLook collection. Below you can find a step-by-step online tutorial on how to get started with GloVis.
Start GloVis for TerraLook Collections (http://glovis.usgs.gov/)
For first-time GloVis users, there is a Quick Start Guide button (in blue) at the bottom left of the viewer page. The Quick Start Guide contains detailed information describing how to use GloVis. This TerraLook guide focuses on the process of building a TerraLook collection.
The options available are outlined below. Click each option for brief
notes. Alternatively, refer to the GloVis Quick Start Guide.
Select Collection: TerraLook
To move around, use one of the following options:
(1) Click in the small world map.
GLS 1975, 1990, 2000 and 2005 (1,000 m and 240 m)
Political boundaries, transportation arteries, cities, and protected areas layers can be displayed to help you locate your area of interest.
Max Cloud Percent:
0% to 100%
The selected image is highlighted in yellow.
Flip Through Date: Month/Year/Date
Only one Landsat Global Land Survey (GLS) image exists for each location for any single date.
The scenes selected are highlighted in green
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.
Open the shopping basket as a Registered User. If you are registered, click on the "Register" option in the Login webpage. The USGS Shopping Basket will open with instructions and information regarding your order.
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.
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:
For example, the size of a collection containing 2 GLS 1975, 2 GLS 1990, 2 GLS 2000, 2 GLS 2005 and 9 ASTER images will be about 141.5 MB. This estimate can vary by 25 percent depending on image texture.