Aster gdem was created by stacking all individual cloudmasked scene dems and noncloudmasked scene dems, then applying various algorithms to remove abnormal data 1, 2, 3. Since it is in spanish, im reproducing it in english. Gdem is listed in the worlds largest and most authoritative dictionary database of abbreviations and acronyms the free dictionary. You can download the aster dem data for free from the usgs earth explorer. The srtm color index above and aster gdem color index layers show land elevation around the world, measured in meters. The aster global digital elevation model aster gdem version 3 v3 was generated using 1,880,306 level1a scenes acquired between march 1, 2000 and november 30, 20. However i am having an issue with the bit depth of the provided data. Makinanosantillana,b a csu phillidar 1 project, caraga center for geoinformatics college of engineering and information technology, caraga state university. Which dem data is better for elevation mapping, aster or srtm satellite data. Aster global dem version 3, and new aster water body dataset. Aster gdem global elevation data center for earth observation. Instead, the 30m data is averaged to 90m resolution. The aster gdem is available at no charge to users worldwide via electronic download from japan space systems and from nasas land.
This tutorial shows you how to download aster digital elevation model dem data for free from the following website website. Usually the srtm data can be downloaded from usgs earth explorer or nasa earth data server. In contrast, aster gdem is developed based on a grid of 1 x 1 degree in latitude and longitude and requires no scene selection or mosaicking. As you can see both are very close to the srtm data in resolution. The first version of the aster gdem, released in june 2009, was generated. The aster advanced spaceborne thermal emission and reflection radiometer instrument was built by meti and launched onboard nasa s terra spacecraft in. Free 30meterresolution elevation data for most of the. How to download aster global dem version 3 from earthdata. Looking for online definition of gdem or what gdem stands for. Aster gdem boasted a global resolution of 90 meters with a resolution of 30 meters in the united states. The only problem is that it takes forever to download and i do not feel like dr. The gdem and astwbd are available for download from nasa earthdata and japan space systems. Consequently, meti and nasa acknowledge that aster gdem version1 should serve as an experimental or research grade product.
Aster gdem tiles are available for electronic download from. Global digital elevation model aster image gallery. How to download srtm elevation data in qgis geodose. The next release is planned for later in 2014, and it is expected to include all of south america plus north america south of the united states. The gdem is produced with 30meter 98feet postings, and is formatted as 23,000 onebyone degree tiles. Release of aster gdem version 2 03 october, 2011 the aster global digital elevation model aster gdem is a joint product developed and made available to the public by the ministry of economy, trade, and industry meti of japan and the united states national.
More info including download links can be found here. 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. Higher level data products hldps, the aster global digital elevation model gdem. The scope was to calculate a difference map to the local high resolution dem. This is significantly less resolved then aster but ten times better than. I have done some test in the southern alps around trento which is among the most complex terrains in europe. Aster dem 30m world 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. Aster gdem global elevation data the science teams at the nasa jet propulsion lab jpl and japans ministry of economy, trade, and industry meti used the aster sensor onboard the terra satellite to produce 30 m resolution elevation data.
The main difference between srtm and aster gdem is the mesh size since srtm is generally available with a 90 m. This aster product is available at no charge for any user pursuant to an agreement between meti and nasa. This is a 30m raster product, whichencodes every pixel as either lake, river, or ocean. The gdem is produced with 30 meter postings, and is formatted in 23,000 1 x 1. In october 2011, nasa released the new aster gdem global dataset 30m and i have been wanting to get my hands on it.
This tutorial will discuss how to download srtm elevation data directly in qgis using srtm downloader plugin. The instrument has been collecting data since february 2000. The gdem and astwbd are available for download from nasa earthdata and. Glovis search the entire aster data archive, including terralook collections, using a browsebased map interface. Aster global dem version 3, and new aster water body. Version 3 of the advanced spaceborne thermal emission and reflection radiometer aster global digital elevation model gdem is now. 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. Dr chrystiann lavarini looked at bias in the detrital record due to pebble abrasion. For more information about the gdem, see the validation report.
Heres a srtm90 dem image, 90meter horizontal resolution. Advanced spaceborne thermal emission and reflection radiometer. Learn how easy it is to search and download freely available shuttle radar topographic mission srtm dems, that were collected in february 2000 in a special joint mission onboard sts99, using x. Void pixels due to clouds and snow pixels within 60 deg. Some days ago a new version of the alos 30m dem was released. Best source for aster gdem v2 and srtm data using the seamless server. Lp daac meti and nasa release the aster global dem. Aster level4z is provided for a given square of approximately 60 x 60 km corresponding to the scene acquired by aster. Download srtm 30m digital elevation models for free. The announcement was made at the united nations heads of. The data which is in geographic decimal coordinates latitude and longitude is posted on one arcsecond.
On the default palette, white indicates the highest elevations, then brown, yellow and greens indicate low. Aster gdem global digital elevation model has been produced as a joint activity of the ministry of. Agustin castillo has a nice short tutorial on how to download aster gdem tiles. In this video, i have clearly shown the steps required to download aster gdem v3 from earthdata. Lpdaac gtopo30 coarse scale 1km dem data nga raster roam. As part of this project emerged the aster global digital elevation model gdem.
You can turn on or off individual tile footprints and immediately download each tile. The aster gdem covers land surfaces between 83n and 83s, and was produced through automated processing of 2. Validation of the aster global digital elevation model. The aster gdem greyscale shaded relief layer above shows surface elevation as shaded relief in shades of grey. The absolute vertical accuracy of gdem v3 was calculated by comparison with more than 23,000 independent reference geodetic ground control points from the u.
Nevertheless, they are confident that the aster gdem represents an important contribution to the global earth observation community. If you have global mapper software you may download free gis layers including aster gdem v2 worldwide elevation data. 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. To upgrade your browser, click on the icons below to go to the download page. And heres a gdem image of the same area, 30meter horizontal resolution. Srtm elevation data is an effort to provide digital elevation model dem at global scope with highest resolution 30 m. The aster global digital elevation model version 2 gdem v2 is also a free dem that covers land surfaces between 83 deg.
The aster global digital elevation model version 3 gdem v3 was evaluated over the conterminous united states in a manner similar to the validation conducted for the original gdem version 1 v1 in 2009 and gdem version 2 v2 in 2011. The following products are available to all users at no cost. How to download aster dem 30m data for free youtube. This interface attempts to ease the pain of downloading 30meter resolution elevation data from the shuttle radar topography mission click on yellow tiles to download their corresponding data tiles come as zipped srtmhgt files at 1arcsecond resolution 3601x3601 pixels in a latitudelongitude projection, downloaded from nasa servers. 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. Space images asters global digital elevation model gdem. Shuttle radar topography mission srtm gl1 global 30m seems to have better coverage and the data heightmap quality is much better than alos world 3d 30m, it is highly recommended you download srtm instead. Yet we havent done the math and this noise might result from our blackwhite color stretch. Nasa and meti release aster global dem version 3 lp daac. Aster gdem is a product of meti and nasa the improved resolution is obvious, but so is the increased bumpiness and other odd features in the gdem data, artifacts of the data collectionreduction. The data was referenced to wgs84, egm96 vertical datum. Does anyone know where to download a free digital elevation. Which dem data is better for elevation mapping, aster or.
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 seamless and directly reusable global digital elevation model. Free digital elevation model dem and free satellite data download links. This global digital elevation model, or gdem, is a product of the advanced spaceborne thermal emission and reflection radiometer aster, a joint program of nasa and japans ministry of economy, trade and industry. The aster gdem v2 maintains the geotiff format and the same gridding and tile structure as v1, with 1 arcsecond 30m grid of elevation postings and 1 x 1 degree tiles. 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. Free digital elevation model dem and free satellite data. The recent publication of the aster gdem 30m is a great step towards a worldwide high resolution elevation model. Then select digital elevation, then aster global dem, and click results. The resampled data naturally does not feature significantly more detail than the srtm data, at the same time noise is still visibly higher. The gdem was created by processing and stereocorrelating the 1. There is a new, 30 meters resolution srtm dtm coming out. He is now working on geomorphological issues related to mining for golder, an environmental consultancy in brazil. In order to use earthdata search, you must upgrade your web browser. Shuttle radar topography mission srtm gl1 global 30m.
Creating contours using aster dem and global mapper. Aster global digital elevation model aster gdem easytouse topographic information of the global terrain the ministry of economy, trade and industry of japan meti and the national aeronautics and space administration nasa are collaborating on a project to develop aster global digital elevation model aster gdem, a dem data which is acquired by a satelliteborne sensor aster to. If you try to download more than 100 tiles, the first 100 tiles are immediately. Aster gdem and astwbd tiles may be downloaded directly from nasas lp daac data pool. Nasa and japans joint operation was the birth of advanced spaceborne thermal emission and reflection radiometer aster. Aster global digital elevation model aster gdem easytouse topographic. As you might have seen, the data in the aster gdem looks a little bit noisy. Sean buckley, nasas jet propulsion laboratory our objective is to provide the scientific and civil communities with a stateoftheart global digital elevation model dem derived from a combination of shuttle radar topography mission processing improvements, elevation control, voidfilling and merging with data unavailable at the time of the original srtm. The aster gdem is distributed as geographic tagged image file format geotiff files with geographic coordinates latitude, longitude. This will list the aster gdem tiles that intersect your area of interest rectangle. Aster gdem version 3 shaded relief topography of san francisco, california, usa.
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