I have done some very preliminary subjective checking. In october 2011, nasa released the new aster gdem global dataset 30m and i have been wanting to get my hands on it. We ask you for some basic organizational and contact information to help us interpret the results and, if needed, to contact you for clarification. These aster data are now available at the usgs earth explorer site. Chrysoulakis university of athens, department of geology and geoenvironment, remote sensing. You can find information about the aster gdem data in the dem faq on this site. The aster gdem is distributed as geographic tagged image file format geotiff files with geographic coordinates latitude, longitude. Advanced spaceborne thermal emission and reflection radiometer.
The first version of the aster gdem, released in june 2009, was generated. The usgs earth explorer gives a quick and intuitive way to download free aerial and satellite imagery. The instrument has been collecting data since february 2000. Since it is in spanish, im reproducing it in english.
This r package is designed to obtain usgs or epa water quality sample data, streamflow data. Digital line graph data digital line graph dlg data are digital representations of cartographic information. Select from an array of stories below to learn more about worldview, the satellite imagery we provide and events occurring around the world. If you are going to performing analysis on the landsat data, the level 1 geotiff data product is probably the one youre after, which will be the largest file size. However i am having an issue with the bit depth of the provided data.
The aster gdem version 3 data product was generated using aster level 1a scenes acquired between march 1, 2000, and november 30, 20. The advanced spaceborne thermal emission and reflection radiometer aster is a japanese sensor which is one of five remote sensory devices on board the terra satellite launched into earth orbit by nasa in 1999. The original raw open data from us geological survey srtm 1arc, nasa and meti aster gdem and european union eudem has been modified. Which dem data is better for elevation mapping, aster or. Ramon notes that due to various artifacts and highfrequency noise, the gdem data may not be as impressive as one would hope relative to the srtm data. This aster product is available at no charge for any user pursuant to an agreement between meti and nasa. Aster global dem version 3, and new aster water body. This is a tiled collection of the 3d elevation program 3dep and is one meter resolution. Jun 29, 2009 the gdem was created by processing and stereocorrelating the 1. Aug 03, 2009 opentopography team member ramon arrowsmith has a preliminary comparison of the aster gdem data with 90 m shuttle radar topography mission srtm data on his blog.
This will list the aster gdem tiles that intersect your area of interest rectangle. The primary goal of the conus validation was to fully characterize the vertical accuracy of gdem v2. The 3dep data holdings serve as the elevation layer of the national map, and provide foundational elevation information for earth science studies and mapping applications in the united states. In this video, i have clearly shown the steps required to download aster gdem v3 from earthdata. The first aster gdem was released in 2009, with version 2 being released in 2011. The srtm product is based on space shuttle endeavours sts99 mission in february 2000 using two radar antennas. If you want to download all the tiles 4 in this example, click the download all button. You can turn on or off individual tile footprints and immediately download each tile. Nasa and japanocos ministry of economy, trade and industry meti announced the release of the aster global digital elevation model gdem on june 29, 2009. Frequently asked questions aster center for earth observation. Features include temporal comparison functionality, export customizable graphic file, generate and download a video animation of the oldest and newest images displayed in the viewer, to name a few. A global dem refers to a discrete global grid dems are used often in geographic information systems, and are the most common basis for digitally produced relief maps.
I dont quite understand the termofuse of aster global dem v2 data. The aster advanced spaceborne thermal emission and reflection radiometer global digital elevation model or aster gdem for short is a joint us and japanese effort. The original raw open data from us geological survey srtm 1arc, nasa and meti aster gdem and european union eudem has been modified, adapted and overlaid to fill the gaps and provide a. The gdem was created by processing and stereocorrelating the 1. It is based on data from sensors on board on the nasa terra satellite launched in 1999. The aster gdem version 3 maintains the geotiff format and the same gridding and tile structure as in. Webgis free dlg data geographic information systems. The aster products were created from approximately 1. This version of the ned was tested by comparison with the global positioning system gps points was the 1arcsecond layer released in june 2003, which was. How to download aster global dem version 3 from earthdata. The aster advanced spaceborne thermal emission and reflection radiometer sensor is an imaging instrument flown on the terra satellite which was launched in december 1999. Jul 02, 2009 agustin castillo has a nice short tutorial on how to download aster gdem tiles. Comparison of dems derived from usgs dlg, srtm, a statewide photogrammetry program, aster gdem and lidar.
If you just want a few of the available results, click on each tile you would like to download in the results pane then the download single granule data button. Which dem data is better for elevation mapping, aster or srtm. Elevation data provides height above the sea level in meters for every single place in the world, measured for regions of approximately 30x30 meters. Nasa worldview visually explore the past and the present of this dynamic planet from a satellites perspective.
O n monday 29 th of june of 2009, nasa and japans ministry of economy, trade and industry, released the global digital elevation model gdem created from advanced spaceborne thermal emission and. Agustin castillo has a nice short tutorial on how to download aster gdem tiles. The aster global digital elevation model version 2 gdem v2 was evaluated over the conterminous united states in a manner similar to the validation conducted for the original gdem version 1 v1 in 2009. The aster advanced spaceborne thermal emission and reflection radiometer instrument was built by meti and launched onboard. We will not distribute responses associated with you as an individual. Download aster dem digital elevation model for free from usgs.
Query and order satellite images, aerial photographs, and cartographic products through the u. The main difference between srtm and aster gdem is the. Dec 09, 2015 the aster products were created from approximately 1. It coverage spans from 83 degrees north latitude to 83 degrees south, covering 99 per cent of earths landmass. When presenting or publishing aster gdem data, i agree to include aster gdem is a.
Srtm dem data is being housed on the usgs earth explorer. The new global digital elevation model, aster gdem, was produced by the ministry of economy, trade and industry meti of japan and the united states national aeronautics and space administration nasa from optical stereo data acquired by the advanced spaceborne thermal emission and reflection radiometer aster satellite instrument. The aster gdem is the only dem that covers the entire land surface of the earth at high resolution. Earth, moon, or asteroid created from a terrains elevation data. Anyone can easily use the aster gdem to display a birdseyeview map or run a flight simulation, and this should realize visually sophisticated maps. There are a lot of very prominent spikes in areas with both complex topography and frequent dense cloud cover. For more information about the gdem, see the validation report. Aster gdem global digital elevation model has been produced as a joint activity of the ministry of economy, trade, and industry meti of japan and the united states national aeronautics and space administration nasa. I agree to redistribute the aster gdem only to individuals within my organization or project of intended use or in response to disasters in support of the geo disaster theme. The only problem is that it takes forever to download and i do not feel like drawing tiny little boxes for the entire world. We have compared the gdem with srtm 3 arc second data for 52 locations in europe and north america, using nextmap ifsar dsm and. Space images asters global digital elevation model gdem. Nasa and the usgs both distribute full aster level 1t scenes for immediate download and allow you to place orders for aster products. Validation of the aster global digital elevation model gdem version 2 over the conterminous united states.
Aster, gdem, srtm, digital elevation model abstract. How to download aster dem 30m data for free youtube. The astwbd data product was created in conjunction with the aster global digital elevation model aster gdem version 3 data product by the sensor information laboratory corporation silc in tokyo. Nov 06, 2016 download aster dem digital elevation model for free from usgs how to download dem data from usgs download free dem digital elevation model download how to download dem digital elevation model usgs.
Validation of the aster global digital elevation model. Mar 24, 2001 the usgs sentinel2look viewer allows comprehensive searching and downloading of fullresolution sentinel2 images. A digital elevation model dem is a 3d cg representation of a terrains surface commonly of a planet e. Usgs earth resources observation and science eros center archive spans from 1937 aerial photographs to millions of satellite images of the earths surface, starting with the original earth orbits in the 1960s and first landsat satellite in 1972, to our current hourly additions of satellite images.
The aster gdem purports to be the highest resolution global digital elevation model, with 30 m spacings actually 1 arc second. Download aster dem digital elevation model for free from usgs how to download dem data from usgs download free dem digital elevation model download how to download dem digital elevation. Comparison of dems derived from usgs dlg, srtm, a statewide. Then select digital elevation, then aster global dem, and click results. The usgs spectral library is a reference data base containing reflectance spectra, and associated sample documentation, that can be used to identify minerals, determine mineral chemistry, discriminate between vegetation species, and detect hydrocarbons and contaminants in the environment. Geological survey usgs dlg data are classified as large, intermediate, and small scale. Which dem data is better for elevation mapping, aster or srtm satellite data.
Dlgs of map features are digital vectors converted from maps and related sources. The gdem and astwbd are available for download from nasa earthdata and japan space systems. Can i sell maps produced from aster global dem v2 data. The gdem is produced with 30meter 98feet postings, and is formatted as 23,000 onebyone degree tiles. The gdem is produced with 30 meter postings, and is. So id say download both and compare for your region.
The aster global digital elevation model version 2 gdem v2 was evaluated over the full extent of the conterminous united states conus in a manner similar to the validation conducted for the original gdem version 1 in 2009. Examples of aster products include surface reflectance, temperature, and elevation. Validation of the aster global digital elevation model gdem. Also, aster gdem distribution site will be suspended due to this update.
The first release of the aster gdem dataset was in june 2009. Aster gdem is an easytouse, highly accurate dem covering all the land on earth, and available to all users regardless of size or location of their target areas. For comparison purposes, a higherresolution true color image with the same extent is included below each this image is from 2010, however. Government computer this is the nasa land processes distributed active archive center lp daac distribution server hosted at the usgs earth resources observation and science eros center. The state data files are recent files dating between 1990 and 1994 that are organized by state. Shown above is the aster gdem color shaded relief layer. The aster gdem is available at no charge to users worldwide via electronic download from japan space systems and from nasas land.
The aster gdem covers land surfaces between 83n and 83s and is comprised of 22,702 tiles. The section dlg data files are historical files dating between 1973 and 1980 that are organized by sections of the united states e. Introduction the advanced spaceborne thermal emission and reflection radiometer aster global digital elevation model gdem was developed jointly by the ministry of economy, trade, and industry meti of japan and the united states national aeronautics and space administration nasa. Data by theme gis data guide library guides at purdue. Aster gdem global elevation data center for earth observation. Download aster global dem data from earth explorer youtube. The aster global digital elevation model astgtm was developed jointly by. Global map nasa and japans ministry of economy, trade and industry meti released the advanced spaceborne thermal emission and reflection radiometer aster global digital elevation model gdem to the worldwide public on june 29, 2009. The aster global digital elevation model gdem version 3 astgtm provides a global digital elevation model dem of land areas on earth at a spatial. Aster global dem version 3, and new aster water body dataset. Since the release of the version 1 on june 29, 2009, the aster gdem has been widely used by many users and it has greatly contributed to. The recently released aster global digital elevation map gdem from nasa and japans meti has been widely publicized on geospatial data blogs, email lists and in the mainstream media. Creating contours using aster dem and global mapper.
The gdem and astwbd are available for download from nasa earthdata and. One characteristic of gdem v2, specifically the number of aster scenes stereo pairs used to derive an elevation for a. In the results, click the aster global digital elevation model v003 result. The usgs spectral library is a reference data base containing reflectance spectra. The absolute vertical accuracy of gdem v2 was calculated by comparison with more than 18,000 independent reference geodetic ground control points from the national geodetic survey. At 30 meter resolution, these data promise relatively highresolution dem coverage for most of the globe coverage. Global digital elevation model aster image gallery. Aster gdem version 3 shaded relief topography of san francisco, california, usa.
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