Jul 02, 2009 agustin castillo has a nice short tutorial on how to download aster gdem tiles. Ocean 3d aegean sea discover ocean in a 3d enviroment. The aster gdem version 3 data product was created from the automated processing of the entire aster level 1a archive of scenes acquired between march 1, 2000, and november 30, 20. Srtm data is usually available direct from nasas website no longer ftp. The eosdis distributed active archive centers daacs provide centerunique tools for functions such as searching and subsettting data.
A001 download aster gdem v3 ar 0 0 jamal chaaouan dimanche 5 avril 2020 download aster gdem for free. Jan 08, 2015 from now on, srtm1 can beat the free aster dgm with a large global coverage. Aster l1b and l1t data, the aster gdem, and naalsed products for the world. This works with firefox, in safari mac users, i couldnt see the selection map.
How to download free dem digital elevation model aster gdem. Wist or the aster gdem ordering site, maintained by the earth remote. Srtm or the shuttle radar topography mission was started 1999 onboard the endeavour and collected data for 11 days. This dem dataset was created by stereocorrelating the 1. Jan 01, 2017 firstly, most of the researchers focused on srtm3 and aster gdem v2, which are the most popular global dem datasets. 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. Release numbering for all of the above will follow this convention. Alternatively, you can earthdata access to upgrade your browser. After half hour we got an email with the ftp link to download the data. Srtm is probably of better quality than the aster gdem, but lower quality than the 1 usgs nedgdep.
The first version of the aster gdem, released in june 2009, was generated using stereopair images collected by the aster instrument onboard terra. Free aster l1al1b data, source of stereo pairs for aster dems and a rich multi spectral dataset. The main issue with gdem is artificial trash on the flat sands. The data could be visualised in 3d with the virtual terrain software. Of these datasets, the surface reflection and aster surface elevation are 2d geospatial parameters which may be. Mar 18, 20 i have been trying to use aster data to use as a dem in cityengine. Gisat offers srtm dem products fulfilling customer specific requirements e. How to download aster dem 30m data for free youtube. The eective resolution of gdem is possibly 23 times coarser than the nominal resolution of 30 m. Data preparation dems of the study site were transformed into the same coordinates referenceuniversal transverse mercator utm zone 32 north. Heightgeomorphology data global srtm digital elevation model is possibly the. Which dem data is better for elevation mapping, aster or. Which dem data is better for elevation mapping, aster or srtm. Aster science team desires consistency at both product distribution points operations concept obtain new cloud values from gds onetime process for historical data ongoing ftp pull post ingest 12 weeks retain original cloud values in hdf files update metadata and clients with new cloud values.
In order to use earthdata search, you must upgrade your web browser. This will list the aster gdem tiles that intersect your area of interest rectangle. Sep 25, 2014 free download with an echoreverb account via ftp pull. The aster gdem data is a very interesting and useful addition to the existing srtm data set. Srtm dem is available free of charge via ftp or on cddvd service charged. Without the publication of aster gdem version 2, the task of filling the large srtm desert voids would have taken considerably longer. 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. 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. Remote topography mission srtm dataset which is freely available. This interface attempts to ease the pain of downloading 30meter resolution elevation data from the shuttle radar topography mission. Since it is in spanish, im reproducing it in english. Lp daac has begun migrating data to a cloudbased environment.
Stereo correlation was used to produce over one million individual scene based aster dems, to which cloud masking was applied. The aster gdem v2 data are used as the elevation source for. Obtaining aster gdem data and converting to srtm1 for use. How to download free aster global dem version 3 2020. Due to the artefacts and errors in the data however it is not well suited to be used directly in visualizations in most parts of the earth surface. Comparing dems of singapore maps and spatial analysis. In the search box type aster gdem and select dataset note if you want a. At the end of the selection process, you will receive email instructions on downloading your data via ftp. Aster gdem coverage spans from 83 degrees north latitude to 83 degrees. The main source is still srtm, but where srtm data are void or anomalous there is input from gdem, landsat and various topographic maps. If you can live with the resolution of the srtm90 data, thats probably a better choice. This tool can be used to browse and download aster gdem data based on.
These products are described in the products section in full details. Elevation data used in this image was acquired by the shuttle radar topography mission srtm aboard the space shuttle endeavour, launched on february 11, 2000. Evaluation and validation of recent freelyavailable aster. An interesting flood analysis using available free dem data recently completed for a client. This package contains the aster client tools for macos. The first version of the aster gdem, released in june 2009, was generated. Aster science team desires consistency at both product distribution points operations concept obtain new cloud values from gds onetime process for historical data ongoing ftp pull post ingest 12 weeks retain original cloud values in hdf files. The vast majority of singapore is covered in the n01e103 tile, while parts of eastern singapore, pulau ubin and pulau tekong can be found in the n01e104 tile. Highquality seamless dem generation blending srtm1. Dec 09, 2009 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.
Africa dem data for all of africa can be downloaded via the world coverage map. Antarctic peninsula 100 m digital elevation model derived from aster gdem this data set provides a 100 meter resolution surface topography digital elevation model dem of the antarctic peninsula. Aster is an imaging instrument that is flying on the terra satellite launched in december 1999 as part of nasas earth observing system eos. Nest 4c overview esa earth online european space agency. Gps coordinates latitude, longitude and altitude decimal degrees or degrees,minutes,seconds. The aster dem and srtm dem 1second are resampled to precisely 30 by 30 m dems using bicubic 15 resampling metz et al. A practical guide to geostatistical mapping, 2nd edition. Also, the data is certainly far from the quality the ess. Mineral maps for western australia available for free download via their ftp site. Digital elevation data with srtm voids filled using.
Generally, accuracy is quite good, but is not always up to srtm standard. Creating contours using aster dem and global mapper. Aster global digital elevation model gdem overview the advanced spaceborne thermal emission and reflection radiometer. The aster instrument was built by japans ministry of economy, trade and industry meti and launched aboard nasas terra spacecraft in december 1999. It can be well used to fill the voids in the srtm data. In this paper, we propose a method to generate a seamless dem dataset blending srtm1, aster gdem v2, and icesat laser altimetry data.
Agustin castillo has a nice short tutorial on how to download aster gdem tiles. The dem is based on advanced spaceborne thermal emission and reflection radiometer aster global digital elevation model gdem data. Aster is providing scientists in numerous disciplines with critical information for surface mapping and monitoring dynamic conditions and temporal change. Aster gdem and astwbd tiles may be downloaded directly from nasas lp daac data pool. Data download in this section you can find examples of gisat standard products gisat available for free download. Pdf highquality seamless dem generation blending srtm1. Antarctic peninsula 100 m digital elevation model derived. 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.
Download aster global dem version 3 telecharger mnt aster global dem version 3 aster global dem3 aster global dem3 aster global dem. Srtm1 1 arc second now available with large global. Usage of dataencoded web maps with client side color. The aster gdem product is available for free at the nasa wist website. Srtm data, in hgt format, can be downloaded from here, but for some. Space images nyiragongo volcano, congo, map view with. Sep 04, 2011 gdem is of little use in areas of low relief sd 20 m. Download srtm data the data could be downloaded under the open database license timestamp 32011. I by visually comparing dems for the four case studies, one can notice that gdem often carries some arti cial lines and ghostlike features. I also converted it to a geotiff in globalmapper just to make sure it got the coordinate data. Msp geotrans can be downloaded to run as a standalone application.
The biggest problem with srtm is holes, which occur mostly in two settings. Highquality seamless dem generation blending srtm1, aster. All datasets which are captured with satellites, airplanes or other flying platforms are originally dsms like srtm or the aster gdem. The links provided in the category tables below list and describe some of these available datahandling and service tools. Have fun in examining the new data for your region. I gdem is of little use in areas of low relief sd gdem is possibly 23 times coarser than the nominal resolution of 30 m. If you want to download all the tiles 4 in this example, click the download all button.
Aster gdem and free aster l1al1b data see the nasa wist website. The methodology used to produce the aster gdem involved automated processing of 2. Additionally, the aster global digital elevation model gdem may be ordered, free of cost, from either the nasa. Aster data can be found from several sources, but i find the earth explorer site to be the most intuitive option. The aster global digital elevation model gdem 1 arc second dataset is the first product to move from the traditional infrastructure to the nasa earthdata cloud edc and will be off. Figure 1 aster gdem file structure the names of individual data tiles refer to the latitude and longitude at the geometric center of the lowerleft southwest corner pixel. Quick guide to free geoinformatics for disaster management core. For additional information on aster data access, distribution, and citation policies, please visit the lp daac aster policies page. The 2009 and 2011 releases of a global aster gdem dataset, with 1 postings, may. Data output from gdex is available in geotiff or arcascii format. 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. Effects of spatial resolution on slope and aspect derivation for. Dec 01, 2012 in the latest release of version 2 aster gdem, lp daac recommends that users download the dem data of interest in their customized forms through demex currently named global data explorer.
The main difference between srtm and aster gdem is the mesh size since srtm is generally available with a 90 m mesh, but the mesh size is not the resolution. This provides really fast download unlike some other ftp sites global land. 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. Features terrain and bathymetric data for aegean sea. Free satellite data terrainmap satellite image analysis. However, the aster gdem is severely affected with random noise and anomalies, while the previously released srtm3 v4.
Digital elevation data with srtm voids filled using accurate. 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. The gdex tool allows users to browse and download aster gdem data based on geographic areas of interest or predefined regions, including state, province, and county for the united states. Planetdem 30, a global digital elevation model dem that offers reliable, seamless and accurate data with 30meter resolution for the earths entire land surface. More info including download links can be found at usgs eros data center. Most of the data providers usgs, ersdac, cgiar, spot image use the term dem as a generic term for dsms and dtms. Aster global digital elevation model version 2 gdem v2 on october 17, 2011. The dataset is large 1 tb, so there are computational issues associated with using it as a basis for global ess predictions. Space images nyiragongo volcano, congo, map view with lava. By visually comparing dems for the four case studies, one can notice that gdem often carries some articial lines and ghostlike features. The gdem and astwbd are available for download from nasa earthdata and. How to download free dem digital elevation model aster. Aster represents a revolution in the remote sensing community because of the availability of its imagery and its superior resolution.
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