But, i think we could come up with a way to correct the data. These products are described in the products section in full details. Ten years ago i wrote the geotiff4 utility to help with this problem. It will be interesting to see if aster remains as popular now that 90m srtm data is finally. If you want to download srtm data, those data are available at the us geological surveys eros data center for download. In order to use earthdata search, you must upgrade your web browser. Obtaining aster gdem data and converting to srtm1 for use. Users should be aware that these data are intended for use with a geographic information system gis or other special application software, and are not directly viewable in a browser. In the search box type aster gdem and select dataset note if you want a. Information for how to sign up for an account can be found here. The data pool is the publicly available portion of the lp daac online holdings.
There are different places where you can download the aster dem, first is lp daac global data explorer and next is nasa reverb. If anyone is having trouble let me know as a couple of my conversion utilities can ingest cded. Area, resolution, map projection, satellite data, file format, ftp, size. Prior to release of the aster data, srtm was the one of the free dem available on the market. 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. Srtm vs gmted2010 dem data geonet, the esri community. If you download files one at a time, you can get dted or geotiff in. Aster global digital elevation model version 2 summary. Aster global digital elevation model gdem overview the advanced spaceborne thermal emission and reflection radiometer.
This makes converting and transporting the files from one application to another a challenge. Gis software download aster nasa geo dem and building. All swir data collected after 1 april 2008 has been marked as unusable. Nasa has released version 2 of the shuttle radar topography mission digital topographic data also known as the finished version. 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 2009 and 2011 releases of a global aster gdem dataset, with 1 postings, may also have been noticed.
This version 1 aster gdem gdem1 was compiled from over 1. Srtm data is usually available direct from nasas website no longer ftp. Earthdata search combines the latest eosdis service offerings with user experience, research, and expertise, producing a stateoftheart client for discovering, searching, visualizing, and retrieving earth science data. To upgrade your browser, click on the icons below to go to the download page. 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. The gdal package can be very helpful for working with dems from other sources. Since it is in spanish, im reproducing it in english. 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. Aster global dem version 3, and new aster water body. Validation of the aster global digital elevation model. The dem files are also offered in a 16bit geotiff format. We prepared srtm dem for the czech and slovak users in national projections.
At the end of the selection process, you will receive email instructions on downloading your data via ftp. 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. Aster data geonet, the esri community gis and geospatial. Mar 18, 20 i have been trying to use aster data to use as a dem in cityengine. I also converted it to a geotiff in globalmapper just to make sure it got the coordinate data. The 3dep data holdings serve as the elevation layer of the national map, and provide foundational elevation information for earth. Data download in this section you can find examples of gisat standard products gisat available for free download. Srtm dem automatically downloaded as needed by nest. However i am having an issue with the bit depth of the provided data. Or you can download the zip file version by clicking on the lower of the two links. Digital elevation data with srtm voids filled using accurate.
The data which is in geographic decimal coordinates latitude and longitude is posted on one arcsecond. Jul 02, 2009 agustin castillo has a nice short tutorial on how to download aster gdem tiles. Lpdaac gtopo30 coarse scale 1km dem data nga raster roam. If you dont find what you need jump in and submit new content.
The aster gdem data is available through the the nasa warehouse. Earthdata search provides access to all daac data via a map webbased interface. However, personally, i recommend a nasa website from the aster project, as the data from this project has a fairly high resolution and its totally free of charge. Aster dem i16 files are about 12 mb and fp32 files are 25mb in either of the two formats. Japan validation team assessed the accuracy of the gdem1, augmented by a team of 20 cooperators. Africa dem data for all of africa can be downloaded via the world coverage map. The main issue with gdem is artificial trash on the flat sands. 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. Advanced spaceborne thermal emission and reflection. Best source for aster gdem v2 and srtm data using the seamless server. Data output from gdex is available in geotiff or arcascii format. You can use a dem from other sources, including the aster gdem, but you would need to do your own preprocessing and mosaicking. You can search the entire aster data archive using a browsebased map interface. 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 overall purpose of this paper is to perform an accuracy assessment of the free to download dems. Access to the data is governed by the draft delegated regulation on copernicus data and information policy. To get a better resolution, you have to pay quite a lot. A geographic information system or geographical information system gis is a system designed to capture, store, manipulate, analyze, manage, and present all. The tools are grouped loosely into broad categories that indicate the primary function of each tool, for example, data handling. Aster global digital elevation model version 2 summary of. If anyone would like to mirror these files on ftp server or traditional web server, please contact me. The gdem and astwbd are available for download from nasa earthdata and.
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. In april 2008, the swir detectors of aster began malfunctioning and were publicly declared nonoperational by nasa in january 2009. The first version of the aster gdem, released in june 2009, was generated. 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. Now i am a little confused as to the difference or advantage of gmted2010 vs srtm data. In 2016, the usjapan aster advanced spaceborne thermal emission and reflection radiometer project released version 3 of.
If we were to make a 3 arc second, one degree, srtm3 tile into a 1 arc second tile, wed have a comparison to an acceptable set of elevations. Bjorn edit i do not know if this merits a new thread but id thought id ask. Aster reporter allows you to create custom sql reports based, schedule some reports, export it to xls, pdf, rtf, html andor csv. Usage of dataencoded web maps with client side color. Save the files andor unzip them to your working directory. This provides really fast download unlike some other ftp sites global land. Aster reporter is written in java tapestry 3 spring and support many database with hibernate to perssist the objects. The eosdis distributed active archive centers daacs provide centerunique tools for functions such as searching and subsettting data. To compare virtual images created from these files with real photographs, click on. The aster global digital elevation model version 2 gdem v2 is also a free dem that covers land surfaces between 83 deg. On june 29, 2009, nasa and the ministry of economy, trade and industry meti of japan released a global digital elevation model gdem to users worldwide at no charge as a contribution to the global earth observing system of systems geoss. You download the data from a designated anonymous ftp site using a ftp client like filezilla. 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. Agustin castillo has a nice short tutorial on how to download aster gdem tiles.
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. Please take a minute to read through the new wiki page. May, 2020 this is a tiled collection of the 3d elevation program 3dep and is one meter resolution. 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 data could be downloaded under the open database license the data could be visualised in 3d with the virtual terrain software srtm digital terrain model of germany. 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. Free digital elevation model dem and free satellite data. 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. Usgs disaster response ftp site optical data from recent disasters. Welcome rgis is a community dedicated to everything gis geographic information systems. Download data aster l1t melalui dan membukanya d qgis music. Which dem data is better for elevation mapping, aster or.
May, 2020 1 meter digital elevation models dems usgs national map 3dep downloadable data collection metadata updated. 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. 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. May 02, 2019 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.
All products are available to all users at no cost. Aster global dem version 3, and new aster water body dataset. Digital elevation data with srtm voids filled using. Vertical accuracy assessment for srtm and aster digital. The links provided in the category tables below list and describe some of these available datahandling and service tools. Elevation data digital elevation models l3harris geospatial. 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.
Srtm data, in hgt format, can be downloaded from here, but for some. This program took aster geotiff or hdf dems and converted them to usgs native dem format. Without the publication of aster gdem version 2, the task of filling the large srtm desert voids would have taken considerably longer. Srtm and aster for the area of najran city, saudi arabia. For example, the aster global digital elevation model currently uses separate geotiff formatted files to store the data and the associated precision parameters. The aster gdem covers land surfaces between 83n and 83s and is comprised of. The aster global digital elevation model gdem is available at no charge to users worldwide via electronic download. Which dem data is better for elevation mapping, aster or srtm.
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