The aster gdem version 1 was released in july 2009 and the version 2, now under processing, will be released in the october 2011. During your trial period, bulletproof ftp server is limited to 1 ftp accounts and 2 connections to the ftp server. Its offerings were gradually curtailed over the year. The second version of the advanced spaceborne thermal emission and reflection radiometer global digital elevation model aster gdem is a stateoftheart global. Meanwhile, the 101st or later tiles are recorded in backlog, and prepared to be downloaded when system has enough resources. All swir data collected after 1 april 2008 has been marked as unusable. The project centers on the use of open gdem datasets such as those from srtm and aster for important geospatial modeling such as watershed deliniation, floodplain modeling, and erosion control planning to name a few. This will list the aster gdem tiles that intersect your area of interest rectangle. Apr 20, 2012 aster global digital elevation map tweet so a project required highresolution shaded relief for parts of borneo, so i thought i would check out the aster global digital elevation map, which is a 30m digital elevation model for use in gis software. 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. This version 1 aster gdem gdem1 was compiled from over 1. If you try to download more than 100 tiles, the first 100 tiles are immediately downloaded. Aster data can be found from several sources, but i find the earth explorer site to be the most intuitive option. After the download process is finished, you should go for tools and then re download.
A lot more noise in the aster dem, and it also appeared to be less accurate. Nasa released the free global digital elevation model nasadem on february 2020 nasadem is a nearglobal elevation model that is being produced primarily by completely reprocessing the shuttle radar topography mission srtm radar data and then merging it with refined aster gdem elevations. Each of these parameters are encoded with the color depth of 16 bit thus making it possible to merge them within the same set of data. The gdem and astwbd are available for download from nasa earthdata and. The biggest problem with srtm is holes, which occur mostly in two settings. Creating contours using aster dem and global mapper. I dont know how to get data with native resolution. Nasa has released version 2 of the shuttle radar topography mission digital topographic data also known as the finished version. Hi, i am a student at the university of bergen in norway working on a project trying to characterize the sediment runoff behaviour using dems. Srtm data, in hgt format, can be downloaded from here, but for some. I cut the grid from 32 to 100 to 300m and still no luck. Srtm vs gmted2010 dem data geonet, the esri community. If anyone would like to mirror these files on ftp server or traditional web server, please contact me. Usgs disaster response ftp site optical data from recent disasters.
The university of hawaii coastal geology group has made available a large collection of shoreline aerial photographs that date back to 1949. Download aster global dem data from earth explorer youtube. Japan validation team assessed the accuracy of the gdem1, augmented by a team of 20 cooperators. As i understand from reading the data pdf file associated with the gmted2010 it is a collection and aggregation of different dem datasets including strm. Usgs seamless data distribution or more conveniently at the ftp site. Yet we havent done the math and this noise might result from our blackwhite color stretch. The aster gdem is the most uptodate, high spatial resolution, complete digital topographic data set of the earth available at no cost to the public, covering. Space images asters global digital elevation model gdem. Highquality seamless dem generation blending srtm1, aster. Usage of dataencoded web maps with client side color.
I decided to use aster gdem2 for different reasons. The gdem is produced with 30meter 98feet postings, and is formatted as 23,000 onebyone degree tiles. Advanced spaceborne thermal emission and reflection. Now i am a little confused as to the difference or advantage of gmted2010 vs srtm data. Dont get me wrong though, its a fantastic data set. Since then, i have had numerous requests to create high resolution terrain maps of other countries and regions. Chrysoulakis university of athens, department of geology and geoenvironment, remote sensing.
Mar 18, 20 i have been trying to use aster data to use as a dem in cityengine. At the end of the selection process, you will receive email instructions on downloading your data via ftp. Since it is in spanish, im reproducing it in english. Validation of the aster global digital elevation model. For the anonymous user with accessible pub directory 04.
Jul 02, 2009 agustin castillo has a nice short tutorial on how to download aster gdem tiles. However i am having an issue with the bit depth of the provided data. I also converted it to a geotiff in globalmapper just to make sure it got the coordinate data. Aster global digital elevation model version 2 summary of.
Jrc, image2000, corine land cover projects satellite image mosaic. The gdem was created by processing and stereocorrelating the 1. So just cut away the stuff thats not meant to be there and you are good to go. The links provided in the category tables below list and describe some of these available datahandling and service tools. Srtm 90m digital elevation database cgiar platform for. We first used bilinear resampling to aggregate aster gdem2 data to 3 arcsec resolution, and to shift grids. The new and improved srtm elevations in nasadem result from better vertical control of each srtm data. Free satellite data terrainmap satellite image analysis. Unrestricted 30 day trial alternatively, if you can tell us a bit about yourself, our system will send you a free 30day, unrestricted subscriptioncode to the most feature rich edition of the software.
Right now, im trying to download aster gdem for all of nigeria. 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. Jun 29, 2009 the gdem was created by processing and stereocorrelating the 1. In order to use earthdata search, you must upgrade your web browser. Lpdaac gtopo30 coarse scale 1km dem data nga raster roam.
We saw the aster data sloping up, while the dted2 did not. May 06, 2017 download data aster l1t melalui dan membukanya d qgis music. Aster gdem2 have its problems, i know, and i dont want to discuss that again. After half hour we got an email with the ftp link to download the data. Download of most images if for free for users, but for some inc. It is particularly suited to problems involving heat transfer, mechanics, fluids, and fluidstructure interactions. Srtm is probably of better quality than the aster gdem, but lower quality than the 1 usgs nedgdep. Performance is all right if wms server able to serve elevation tiles within less than 3 sec wwj client timeouts after 9 seconds, otherwise you would need to try next level 0. In april 2008, the swir detectors of aster began malfunctioning and were publicly declared nonoperational by nasa in january 2009.
Aster gdem data are posted on a 1 arcsecond approximately 30 metres at the equator grid and referenced to the 1984 world geodetic system wgs84 1996 earth gravitational model egm96 geoid, and comes in geotiff. For example, the aster global digital elevation model currently uses separate geotiff formatted files to store the data and the associated precision parameters. If you want to download all the tiles 4 in this example, click the download all button. On successful authentication, the remote ftp server and its accessible folders will be visible. Dear sir aster is a 15 m resolution data and srtm is 3 arc second 90m so certainly aster is better, we have developed set methodoology and was quite successful. 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. Updated version of global elevation data nasadem arab. The server hosting the aster gdem data is frequently extremely busy and thus very slow to pull from.
The gdem version 2 is reproduced using the updated algorithm. The aster global digital elevation model gdem is available at no charge to users worldwide via electronic download. Also, pay attention to the performance of the wms server. It appears that the global 1arcsecond 30m srtm digital elevation model is now being made publicly available through, for example, the united states geological surveys earthexplorer site. The eosdis distributed active archive centers daacs provide centerunique tools for functions such as searching and subsettting data. The earlier released aster geoscience maps of western australia released 15. The first version of the aster gdem, released in june 2009, was generated.
The aster gdem covers land surfaces between 83n and 83s and is comprised of. Srtm data is usually available direct from nasas website no longer ftp. To download a file on the right side, there is remote site section that looks like a file system directory and files. As such, both meti and nasa desire to understand the uses of the aster gdem, expressed as one the geoss applications themes. Digital elevation data with srtm voids filled using accurate.
In the search box type aster gdem and select dataset note if you want a. Best source for aster gdem v2 and srtm data using the seamless server. Scene information is displayed along with the browse image. Pdf evaluation of aster gdem using gps benchmarks and. Srtm is probably of better quality than the aster gdem, but lower. Wist or the aster gdem ordering site, maintained by the earth remote. The srtm 90m dems have a resolution of 90m at the equator, and are provided in mosaiced 5 deg x 5 deg tiles for easy download and use. Gis software download aster nasa geo dem and building. As you might have seen, the data in the aster gdem looks a little bit noisy. 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. Caelinux caelinux is an installable live dvd linux distribution dedicated to open source engineering with a f.
Aster global digital elevation model gdem overview the advanced spaceborne thermal emission and reflection radiometer. Ive also decided to ease my licensing limitation a bit and release the entire 90 meter global terrain map under the creative commons attribution license. 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. You could also try version 2 of the 1arcsecond aster global dem which is also available through the usgs earthexplorer site. Restart wms server, clean elevations cache on your wwj client.
Aster l1t data are available to all users at no cost. Comparing dems of singapore maps and spatial analysis. It is generally acknowledged that the srtm3 data are superior to aster gdem in terms of vertical accuracy in the lowrelief areas jacobsen, 2010, zhao et al. 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. All are produced from a seamless dataset to allow easy mosaicing.
We have restarted batch download for up to 100 tiles. Srtm dem automatically downloaded as needed by nest. The aster gdem is a joint contribution by nasa and the ministry of economy, trade and industry of japan meti to the global earth observation system of systems geoss. Characterization of aster gdem elevation data over vegetated area compared with lidar data. Digital elevation models dem for the entire globe, covering all of the countries of the world, are available for download on this site. Aster global digital elevation model gdem has generated one of the most complete highresolution digital topographic data sets of the world to date. Aster global dem version 3, and new aster water body dataset. Basically, you create a wist account for yourself, specify the region you want to download aster data for, go through an ordering process data is all free, and submit your order. Version 2 is the result of a substantial editing effort by the national geospatial intelligence agency and exhibits welldefined water bodies and coastlines and the absence of spikes and wells single pixel errors. The tools are grouped loosely into broad categories that indicate the primary function of each tool, for example, data handling. The aster gdem is in geotiff format with geographic latlong coordinates and a 1 arc. The ministry of economy, trade, and industry meti of japan and the united states national aeronautics and space administration nasa jointly announced the release of the advanced spaceborne thermal emission and reflection radiometer aster global digital elevation model version 3 gdem 003, and the aster water body dataset astwbd on. Agustin castillo has a nice short tutorial on how to download aster gdem tiles.
Open gis data services for research csc company site. Aster gdem global digital elevation model v002 select search for granules now begins the tedious part where there are over 22,000 aster gdem tiles that cover the globe however, the website only list 400 per page where there is an add all on page button but no add all option i. These areas a nearly okay in csi so i could fill these errors of the aster gdem2 with it. Sep 25, 2014 absolute differences between srtm and aster gdem. The downloadable 3 arc second 1 x1 digital elevation models on this site are mainly.
How to install and configure an ftps server in centos. Produced using copernicus data and information funded by the european union eudem layers. Sentinel download is on requestor pays basis, ie downloading costs a little bit. Free digital elevation model dem and free satellite data. Global mapper downloads very quickly whole area, but it doesnt look like full resolution map. Version 2 is the result of a substantial editing effort by the national geospatial intelligence agency and exhibits welldefined water bodies and coastlines and the absence of spikes and wells. Select a file, then rightclick to open the context menu. Which dem data is better for elevation mapping, aster or srtm. Detailed description and download link can be found in the table below. To upgrade your browser, click on the icons below to go to the download page. The nima raster roam site used to be an interesting and eclectic source of dem and satellite image data.
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