Each map element (Operators, Filters, etc.) has a specific function, described below.
At the end of this guide are some useful hints and suggestions.
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Clicking this icon pops up a highly condensed guide to finding Apollo
images, aimed at first-time users.
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Operator buttons control what a mouse click on the map does.
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After you click the Zoom In operator button, a mouse click on the map recenters the map on that point and zooms in by a factor of about 2. You can zoom in repeatedly. Distortion will occur in some areas, because the map is a simple cylindrical projection.
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After you click the Zoom Out operator button, a mouse click on the map recenters the map on the point and zooms out by a factor of 2. You can repeat this until the whole map is visible.
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After you click the Recenter operator button, a mouse click on the map recenters the map on that point without changing the magnification.
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After you click the Select operator button, a mouse click anywhere on the map looks for a Apollo image covering that point. If any exist, a link for each
image appears in both the Thumbnail frame and the Image List. Click either the
thumbnail or the reference number to open a new browser window with details of that image and downloading options.
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Clicking the Link to this Page operator button creates a link in your browser's address window that captures the current filters,
map background, zoom-in state and chosen images. If you save the link as a Bookmark or a Favorite, you can return to that point at any time.
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Clicking the Help operator button opens this user guide.
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The position display gives the lunar latitude and longitude of the
mouse point in degrees and decimals of a degree. Latitude is given first and runs from 90° north to 90° south. Longitude increases eastward from 0° to 360°, measuring from the central meridian.
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The slider control gives users an additional method of changing the map resolution by a factor of 2 or more. Clicking the
+ icon on the slider causes the map to zoom in by a factor of 2. Clicking the
- icon on the slider causes the map to zoom out by a factor of 2. Clicking or dragging on the slider's red bar between the + and - icons, allows the user to jump instantly to any valid map resolution.
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Mission
Camera images from Apollo missions 15, 16, and 17 can be displayed. The Apollo 16 mission is selected by default when the map first loads. Selecting a different mission set updates the map and shows only images from that mission choice.
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| Camera | ||
| Two camera systems photographed the lunar surface from orbit during the Apollo 15,16 and 17 missions. The Mapping Camera acquired images covering 165 kilometers on a side, with a horizontal resolution of 20 meters from a nominal spacecraft altitude of 110 kilometers. The Panoramic Camera acquired images in narrow strips 20 kilometers wide in the direction of spacecraft motion by 320 kilometers long across the spacecraft's ground track. Panoramic Camera images showed surface features as small as 1 to 2 meters. During these three Apollo missions, the Mapping Camera acquired 6871 usable images, while the Panoramic Camera acquired 4689 usable images. | ||
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Choosing all shows the footprints of both the panoramic and mapping cameras for the missions specified in the Mission filter. | |
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Choosing panoramic
displays the footprints of panoramic camera images for the mission set specified in the Mission filter. Panoramic camera footprints are displayed with a green tint.
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Choosing mapping
displays the footprints of mapping camera images for the mission set specified in the Mission filter. Mapping camera footprints are displayed with a red tint.
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Choosing none
clears the map of all camera footprints.
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All background maps are simple cylindrical projections and have a maximum resolution of 64 pixels per degree, or roughly 0.47 kilometers (~0.3 miles) per pixel at the equator. The projection becomes increasingly distorted toward the poles.
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Choosing
shaded relief
displays a airbrush blended, grayscale topographic map created by the USGS, primarily from Lunar Orbiter photographs. Topography is displayed without the influence of albedo. At right is a shaded relief thumbnail of the crater Copernicus.
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Choosing
gray
displays a grayscale mosaic map created from the red (750 nm) channel of the Clementine spacecraft's ultraviolet/visible camera. At right is a grayscale thumbnail of the crater Copernicus.
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Choosing
color
displays a color mosaic map created from the red, green and blue channels of the Clementine spacecraft's ultraviolet/visible camera.
At right is a color thumbnail of the crater Copernicus. The color background is the default choice when the map loads.
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Choosing
lidar
displays Clementine LIDAR topography data overlaid onto USGS shaded relief maps. At right is a lidar thumbnail of the crater Copernicus. On the LIDAR map, blue and green tinted regions are at lower elevations than red and yellow areas.
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What you see on the map reflects your current choices of filters and background.
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In this example, the user chose images from the panoramic camera, shown here in green, on a grayscale shaded-relief background.
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In this example, the user chose images from the mapping camera, represented here in red, on a Clementine lidar color map background.
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The Image List gives the reference numbers of any Apollo image footprints that cover the map spot the mouse clicked on (in Select Mode).
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In the example at left, four images were found. Each image has a unique identifier. The identifier "AS15-M-0072"
can be broken into its component parts. The "AS15", tells us the image is from the Apollo 15 mission. The "M", tells us this is a mapping camera image. A "P" in this position would indicate a panoramic camera image. The last 4 digits of the identifier, "0072", tells us this is the 72th image taken with this camera. Clicking any of the links would pop open a window providing detailed information about the image.
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When you choose the Select operator (see above) and click on the map,
the Thumbnails frame shows small versions of any Apollo images
covering the spot the mouse clicked on.
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In this example, three mapping camera images
were found. Clicking any thumbnail pops open a window giving detailed
information about the image and choices of image formats for downloading.
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