File:Land shallow topo alpha 2048.png

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DescriptionLand shallow topo alpha 2048.png	Description from http://visibleearth.nasa.gov/view_rec.php?id=2433 : Credit: NASA Goddard Space Flight Center Image by Reto Stöckli (land surface, shallow water, clouds). Enhancements by Robert Simmon (ocean color, compositing, 3D globes, animation). Data and technical support: MODIS Land Group; MODIS Science Data Support Team; MODIS Atmosphere Group; MODIS Ocean Group Additional data: USGS EROS Data Center (topography); USGS Terrestrial Remote Sensing Flagstaff Field Center (Antarctica); Defense Meteorological Satellite Program (city lights). This spectacular “blue marble” image is the most detailed true-color image of the entire Earth to date. Using a collection of satellite-based observations, scientists and visualizers stitched together months of observations of the land surface, oceans, sea ice, and clouds into a seamless, true-color mosaic of every square kilometer (.386 square mile) of our planet. These images are freely available to educators, scientists, museums, and the public. This record includes preview images and links to full resolution versions up to 21,600 pixels across. Much of the information contained in this image came from a single remote-sensing device-NASA’s Moderate Resolution Imaging Spectroradiometer, or MODIS. Flying over 700 km above the Earth onboard the Terra satellite, MODIS provides an integrated tool for observing a variety of terrestrial, oceanic, and atmospheric features of the Earth. The land and coastal ocean portions of these images are based on surface observations collected from June through September 2001 and combined, or composited, every eight days to compensate for clouds that might block the sensor’s view of the surface on any single day. Two different types of ocean data were used in these images: shallow water true color data, and global ocean color (or chlorophyll) data. Topographic shading is based on the GTOPO 30 elevation dataset compiled by the U.S. Geological Survey’s EROS Data Center. MODIS observations of polar sea ice were combined with observations of Antarctica made by the National Oceanic and Atmospheric Administration’s AVHRR sensor—the Advanced Very High Resolution Radiometer. The cloud image is a composite of two days of imagery collected in visible light wavelengths and a third day of thermal infra-red imagery over the poles. Global city lights, derived from 9 months of observations from the Defense Meteorological Satellite Program, are superimposed on a darkened land surface map.
Date	4 July 2011
Source	Land_shallow_topo_2048.jpg
Author	Land_shallow_topo_2048.jpg: NASA derivative work: Martin (talk)
Other versions	Derivative works of this file: OpenGL Tutorial Glossy Textures.jpg OpenGL Tutorial Transparent Textures.jpg

This is a retouched picture, which means that it has been digitally altered from its original version. Modifications: replaced water color by transparent color. The original can be viewed here: Land shallow topo 2048.jpg: . Modifications made by Martin Kraus.

	This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.)
	Warnings: Use of NASA logos, insignia and emblems is restricted per U.S. law 14 CFR 1221. The NASA website hosts a large number of images from the Soviet/Russian space agency, and other non-American space agencies. These are not necessarily in the public domain. Materials based on Hubble Space Telescope data may be copyrighted if they are not explicitly produced by the STScI.[1] See also {{PD-Hubble}} and {{Cc-Hubble}}. The SOHO (ESA & NASA) joint project implies that all materials created by its probe are copyrighted and require permission for commercial non-educational use. [2] Images featured on the Astronomy Picture of the Day (APOD) web site may be copyrighted. [3] The National Space Science Data Center (NSSDC) site has been known to host copyrighted content. Its photo gallery FAQ states that all of the images in the photo gallery are in the public domain "Unless otherwise noted."

Original upload log

This image is a derivative work of the following images:

File:Land_shallow_topo_2048.jpg licensed with PD-USGov-NASA
- 2006-01-14T15:31:13Z Haham hanuka 2048x1024 (238676 Bytes) http://veimages.gsfc.nasa.gov//2433/land_shallow_topo_2048.jpg [[Category:Earth]]

Uploaded with derivativeFX

File history

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	Date/Time	Dimensions	User	Comment
current	14:01, 4 July 2011	2,048 × 1,024 (1.58 MB)	Martin Kraus	Reverted to version as of 12:30, 4 July 2011 because the later version is worse
	12:52, 4 July 2011	2,048 × 1,024 (1.6 MB)	Martin Kraus	finally removed pixels of shallow waters
	12:30, 4 July 2011	2,048 × 1,024 (1.58 MB)	Martin Kraus	still trying to remove pixels of shallow water
	12:22, 4 July 2011	2,048 × 1,024 (1.58 MB)	Martin Kraus	previous upload didn't work, again: trying to remove shallow water pixels
	12:19, 4 July 2011	2,048 × 1,024 (1.58 MB)	Martin Kraus	set some more of the shallow water pixels to transparent
	12:03, 4 July 2011	2,048 × 1,024 (1.58 MB)	Martin Kraus	{{Information \|Description=\|date=4 July, 2011 \|Source=File:Land_shallow_topo_2048.jpg \|Date=2011-07-04 12:01 (UTC) \|Author=File:Land_shallow_topo_2048.jpg: NASA *derivative work: ~~~ \|Permission= \|other_versions= }} {{RetouchedPicture\|repla