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. In this colorized version, low elevations are purple, medium elevations are greens and yellows, and high elevations are orange, red and white. All cloudscreened dems are stacked and residual bad values and outliers are removed. Aster gdem and astwbd tiles may be downloaded directly from nasas lp daac data pool. If you try to download more than 100 tiles, the first 100 tiles are. Aster global dem gdem data are subject to redistribution and citation policies. You can turn on or off individual tile footprints and immediately download each tile. 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 reflection radiometer aster data. In april 2008, the swir detectors of aster began malfunctioning and were publicly declared nonoperational by nasa in january 2009.
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. The aster gdem data is a very interesting and useful addition to the existing srtm data set. The aster gdem is available at no charge to users worldwide via electronic download from japan space systems and. The aster gdem data products are created by the sensor information laboratory corporation silc in tokyo. In the top of the page click on enter wist, and go to the data selection page. It has an alongtrack stereoscopic capability using its near infrared spectral band and its nadirviewing and backwardviewing telescopes to acquire stereo image. Jul 12, 20 silakan download data aster gdem disini sebelum mendownload anda harus register terlebih dahulu. Aster gdem global elevation data center for earth observation. To download srtm elevation data, firstly we have to define a location extent. The aster products were created from approximately 1. This raster product identifies all water bodies as either ocean, river, or lake.
In order to download the data, we need to be logged in the system. Sep 25, 2014 absolute differences between srtm and aster gdem. Source for canadian landsat 7 and many other types of gis data. Free 30meterresolution elevation data for most of the. In digital elevation models generated from aster data the outliers, i. Srtm dem data is being housed on the usgs earth explorer. Ive contacted with one university scientist expert for terrain elevation models and he is convinced that apart from very fine resolution, one should relay rather on srtm3 v. We will merge the improved srtm strip dems, refined aster and gdem v2 dems, and glas data using the srtm mosaic software to create a.
Citeseerx elimination of the outliers from aster gdem data. Nasa worldview visually explore the past and the present of this dynamic planet from a satellites perspective. The version 1 aster gdem data definitely contains some strange artifacts, though. The gdem and astwbd are available for download from nasa earthdata and. Aster gdem characteristics a number of characteristics of the aster gdem and its presentation, which are important to user application of the aster gdem, are presented below. For more information about the gdem, see the validation report. Data dem hasil download dari aster gdem untuk satu lokasi bisa terdiri dari beberapa file. You can find information about the aster gdem data in the dem faq on this site. Each gdem file is accompanied by a quality assessment file, either giving the number of aster scenes used to calculate a pixels value, or indicating the source of external dem data used to fill the aster voids. You will have world satellite imagery as in figure 2.
The gdem is produced with 30 meter postings, and is formatted in 1 x 1 degree tiles as geotiff files. 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. The aster gdem covers land surfaces between 83n and 83s, and was produced through automated processing of 2. The gdem is available for download from nasas eos data archive and japans ground data system. Aster global digital elevation model v001 data dictionary. Aster gdem has 3x better resolution from srtm, however deep analysis shows that its elevation precision is not as good as one could expect. Feb 18, 2020 we will incorporate glas data to remove artifacts at the optimal step in the srtm processing chain. This document does not cover the 30m aster global elevation dataset. Between the most northern islands of greenland and the interior of antarctica, elevation data from the advanced spaceborne thermal emission and reflection radiometer aster global digital elevation model gdem version 3 can be accessed for free. Aster gdem global digital elevation model has been produced as a joint activity of the. What about the elevation of your favorite lake or river. Dec 09, 2009 the version 1 aster gdem data definitely contains some strange artifacts, though. The development of the aster gdem data products is a collaborative effort between national aeronautics and space administration nasa and japans ministry of economy, trade, and industry meti. 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.
Each gdem tile has a corresponding water body tile. The data are posted on a 1 arcsecond approximately 30m at the equator grid and referenced to the 1984 world geodetic system wgs84 1996 earth gravitational model egm96 geoid. This tutorial shows you how to download aster digital elevation model dem data for free from the following website website. Version 3 of the advanced spaceborne thermal emission and reflection radiometer global digital elevation model is now available from nasas land processes distributed active archive center. Aug 06, 2019 the methodology used to produce the aster gdem involved automated processing of 2. The gdem is produced with 30meter 98feet postings, and is formatted as 23,000 onebyone degree tiles. Version 3 of the aster global digital elevation model. Under the data sets tab, select digital elevation srtm srtm 1arcsecond global. 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.
Aster gdem, a dem data which is acquired by a satelliteborne sensor aster to cover all the land on earth. As of 2 april 2016, the entire catalogue of aster image data became publicly available online at. The aster gdem is distributed as geographic tagged image file format geotiff files with geographic coordinates latitude, longitude. Free aster l1al1b data, source of stereo pairs for aster dems and a rich multi spectral dataset. The srtm product is based on space shuttle endeavours sts99 mission in february 2000 using two radar antennas. 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. How to download srtm elevation data in qgis geodose. Dec 09, 2015 the aster products were created from approximately 1. You can do it manually or simply just add a data into qgis map canvas. Shown above is the aster gdem color shaded relief layer. Jun 29, 2009 the new global digital elevation model of earth was created from nearly 1. Jun 29, 2009 the gdem is produced with 30meter 98feet postings, and is formatted as 23,000 onebyone degree tiles. The library is an important resource for analyzing imaging spectrometer data.
Feb 04, 2019 this tutorial shows you how to download aster digital elevation model dem data for free from the following website website. Aster digital elevation model version 3 released terra. 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. As you might have seen, the data in the aster gdem looks a little bit noisy. All products are available to all users at no cost. In addition, how to merge two dem rasters and how to change the style of them in qgis 2.
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. Silakan download data aster gdem disini sebelum mendownload anda harus register terlebih dahulu. Pada gambar tersebut saya akan mendownload data daerah gunung lawu. Elevation data provides height above the sea level in meters for every single place in the world, measured for regions of approximately 30x30 meters. Selected data are averaged to create final pixel values, and residual anomalies are corrected before partitioning the data into 1 degree x 1 tiles. Hopefully, we will soon see a version 2 of the aster gdem that will address some of these issues. But heres a usgs earth explorer download guide to help you get started. To upgrade your browser, click on the icons below to go to the download page. The methodology used to produce the aster gdem involved automated processing of 2. Berikut adalah cara men download data aster gdem dari web usgs. Then we click on the get data link, which will take us to the welcome to wist page. Sebelum digunakan atau diolah lebih lanjut, 2 file tersebut bisa digabungkan terlebih dahulu.
Advanced spaceborne thermal emission and reflection. This view looking towards the northwest was created by draping an aster simulated natural color image over digital topography from the aster global digital elevation model gdem data set. Aster global dem version 3, and new aster water body. Nasa and japans ministry of economy, trade and industry, known as meti, developed the data set.
Nasa and meti release aster global dem version 3 lp daac. Aster gdem and free aster l1al1b data see the nasa wist website. Before ordering aster gdem data, users must agree to redistribute data products only to individuals within their organizations or projects of intended use, or in response to disasters in support of the geo disaster theme. In this video, i have clearly shown the steps required to download aster gdem v3 from earthdata. The first version of the aster gdem, released in june 2009, was generated using. How to download aster global dem version 3 from earthdata. We will merge the improved srtm strip dems, refined aster and gdem v2 dems, and glas data using the srtm mosaic software to create a seamless, voidfilled nasadem. The new global digital elevation model of earth was created from nearly 1. Aster global dem the aster instrument was built by japans ministry of economy, trade and industry meti and launched aboard nasas terra spacecraft in. An aster scene covers an area of approximately 60 km by 60 km and data is acquired simultaneously at three resolutions. Consequently, the aster gdem is available at no charge to users worldwide via electronic download from the earth remote sensing data analysis center ersdac of japan and from nasas land processes distributed active archive center lp daac. This aster product is available at no charge for any user pursuant to an agreement between meti and nasa. We will incorporate glas data to remove artifacts at the optimal step in the srtm processing chain. Nasa nasa, japan release most complete topographic map of earth.
See this tutorial how to add satellite imagery in qgis. The aster scene was acquired november 20, 2001, and is centered near 28. The data are provided as is, and neither nasa nor metijapan space. The aster gdem is available at no charge to users worldwide via electronic download from japan space systems and from nasas land processes distributed active archive center lp daac. 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. Ikuti saja petunjuknya, registrasinya mudah dan tidak membutuhkan biaya. Space images asters global digital elevation model gdem. More info including download links can be found here. The aster gdem covers land surfaces between 83n and 83s and is comprised of 22,702 tiles. Aug 12, 2019 in this video, i have clearly shown the steps required to download aster gdem v3 from earthdata.
In order to use earthdata search, you must upgrade your web browser. The aster global digital elevation model gdem is available at no charge to users worldwide via electronic download. Aster data and products distributed by the lp daac, with the exception of the aster global digital elevation model gdem dataset astgtm version 2 v2, have no restrictions on data use, sale, or subsequent redistribution. Nasa nasa, japan release most complete topographic map. Select from an array of stories below to learn more about worldview, the satellite imagery we provide and events occurring around the world. For example, in this case i added a world satellite imagery image from esri web map server. 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. Gunakan tool define retangle area membuat batas daerah mana yang akan di download. All swir data collected after 1 april 2008 has been marked as unusable. Free digital elevation model dem and free satellite data. In one case a paved road in the flatlands of botswana showed up as a 100m deep trench in the aster data. It can be well used to fill the voids in the srtm data. This tutorial is a demonstration of how to download a digital elevation model dem from the advanced spaceborne thermal emission and reflection radiometer aster version 2.
In addition to digital elevation models for each tile, a separate data set was included that identified water bodies. This raster product identifies all water bodies as either ocean, river, or lake, and each gdem. If you can live with the resolution of the srtm90 data, thats probably a better choice. Mar 03, 2020 the aster gdem version 3 maintains the geotiff format and the same gridding and tile structure as in previous versions, with 30meter spatial resolution and 1x1 tiles. Yet we havent done the math and this noise might result from our blackwhite color stretch. 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.
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