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This massive repository contains more than four million images, all available via public download - but the challenge for users is finding the most appropriate pictures. In this lesson, and using the LandsatLook app, you're an urban planner researching Singapore, a densely populated Asian island, for an image assisting urban planning.

To find a Landsat image of Singapore, you'll use the LandsatLook app to explore the entire database of free Landsat imagery. You want a relatively recent image with minimal cloud cover. Landsat imagery can be large. The file you'll download in this lesson has a size of approximately MB. Make sure you have enough disk space on your computer, and enough time to wait for the download, before proceeding.

The account is free, but does require you to give demographic survey data and contact information. Once you complete your registration, a message is sent to your email address to confirm your registration. Next, you'll open the LandsatLook Viewer and navigate to Singapore. The viewer opens to the default extent of the United States. The Load Images window includes parameters to search for Landsat imagery. The toolbar at the top of the viewer includes buttons for additional options and map controls.

First, you'll change the map extent to Singapore. The Load Images window is replaced by the Search window. The map extent centers on the city-state of Singapore and the Search window is replaced by the Load Images window.

Depending on your browser window size, the windows in the viewer may obscure part of the island. Most of the island is heavily urbanized, with a few open green areas on the western and central parts of the island. Although the viewer has a scale bar in the lower left corner, at this extent it's difficult to discern Singapore's size relative to other geographic features. A country the size of a single city presents unique challenges for land use and urban development.

Although Singapore has expanded its area by reclaiming land from the sea, its confines remain generally fixed, necessitating stringent planning. But proper planning requires quality data. A real urban planning project would use a variety of data types from many sources. The single image you'll download from the Landsat imagery database will instead serve as a starting point, providing a high quality look at the entire city.

Landsat imagery is multispectral, meaning it can be displayed with different bands of visible light to emphasize features such as vegetation, coastlines, or man-made structures.

The image will be a good reference to which you can add more specialized data. For accuracy, the image should be relatively recent. You can also search based on days of the year, which is useful for tracking seasonal trends or specific incidents, such as wildfires. For a general reference image, the day of the year doesn't matter. Clouds obscure ground cover and conceal features.

Reducing the maximum cloud cover will return results with a clearer view of Singapore. You can also search for imagery from specific Landsat sensors. All of them capture multispectral imagery, although they use different types of light and have different pixel sizes.

They also have different years of operation. You'll accept the default sensors. Because new Landsat images are added to the database daily, your search may have returned more images. It may also have a more recent image displayed on the map than in the example images.

All images within the map extent that meet your criteria are returned. Additionally, the most recent images are displayed by default. The Modify Images window, which opened after your search, indicates how many images were returned and how many are currently being displayed. In this example, two out of thirteen images are being displayed, but only one is visible on the current map extent. Depending on the number of active images and the zoom extent of the map, the basemap may disappear such as in the example shown.

The images cover a larger area than Singapore. Two are currently shown. They are displayed as a mosaic, or a collection of multiple images pieced together. You only want to download one image, so you'll change the display to show one image at a time. The map updates and only the most recent image is shown. This image is the most up-to-date for planning purposes. In this example, however, the most recent image has cloud cover that obscures parts of the city.

You'll look at the other images returned by your search to decide the best for download. Alternatively, drag the time slider to view the images. Your search returned some images that were only partially within the map extent at the time of the search, so some images may not cover Singapore at all.

Some images may have black lines across the image, such as in the image from February 9, These black lines are gaps in the sensor data caused by the failure of the Scan Line Corrector in the Landsat 7 satellite. Although these gaps can be filled, an image without significant data gaps is preferred for this lesson. The image that will be used in the example images is from May 24, This image has almost no cloud cover. It's possible that a new image has been added since this lesson was written that shows Singapore with even less cloud cover.

Feel free to choose a different image if appropriate. Now that you've chosen an image for your development project, you'll download it. The metadata table allows you to view information about the images your search returned and add them to your virtual cart for free download. You can choose to look at a table of the images currently displayed on the map or of all images returned by the search. The table changes to list images displayed on the map. You only have the image you want to download displayed on the map, so the table has one entry.

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