Questions tagged [aster]

ASTER is the Advanced Spaceborne Thermal Emission and Reflection Radiometer, an imaging instrument on the satellite Terra.

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6
votes
1answer
584 views

Merging GeoTiffs with GDAL causes grid-like artifacts?

I'm processing ASTER DEM tiles, merging them into larger blocks (to minimize visible tile edges) and importing the contours into a postgis database. Workflow: gdal_merge.py -of GTiff -o merged.tif ...
2
votes
1answer
514 views

Understanding datum and elevation of NASA ASTER DTM?

I have downloaded some data from http://asterweb.jpl.nasa.gov/gdem.asp I would like to relate the elevations to some coastal data which is estimated to a specific ordnance dataum. Can anyone tell ...
0
votes
1answer
29 views

Finding sericite alteration in ENVI 5.3 spectral library?

I work on an area where there is a sericite alteration and i searched for the sericet and did not find a word. I want to know what is called sericet in the spectral library of ENVI 5.3? Sericite is ...
2
votes
1answer
1k views

How to get property of each image in a collection in google earth engine?

I am trying to convert ASTER image from DN values to reflectance. For this I require gain coefficient of each image in the collection I have gathered. //Defining geometry var geometry = ee.Geometry....
0
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0answers
83 views

Aster L1T: Radiance -product to surface reflectance

Earth Engine provides access to Aster level 1 Precision Terrain Corrected Registered At-Sensor Radiance -product (Aster L1T). I would be interested to reach the surface reflectance values of the image ...
0
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0answers
31 views

How do I remove the black background of ASTER in Envi Classic 5.3 “display window”?

I want to change color or remove black bacground of my aster imagery when "save image as" from display window (that loaded as RGB to display.. is there a quick way to do it? here is the what i ask in ...
0
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0answers
19 views

Downloading Aster level 1T product?

When I try to download Aster level 1T data from the USGS Earth Explorer site it asks me to enter my username and password over and over when I click on download link of my desired product. What ...
22
votes
6answers
11k views

How to download the entire ASTER GDEMv2 dataset?

In October 2011, NASA released the new ASTER GDEM global dataset (30m) and I have been wanting to get my hands on it. The only problem is that it takes forever to download and I do not feel like ...
1
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0answers
49 views

How can I summarize the values of a raster to make a clear legend? [closed]

I produced a relief map out of a ASTER Satellite Picture by using a colour ramp (Symbology -> band rendering). I want to make a map out of that in the Print Composer but the Legend is very confusing ...
0
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0answers
16 views

Error in compareRaster(rasters) : different extent

I'm having this error in NDVI tif layers, however, all the layers have the same extent and resolution. The only difference is an elevation layer (Aster_DEM_UTM).
6
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6answers
1k views

DEM generation from ASTER L1B imagery using FOSS

Is there any (photogrammetric or other) FOSS package to support the generation of a DEM from ASTER L1B products (i.e. combining the spectral bands 3N and 3B)? Are there any practical examples or/and ...
5
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2answers
473 views

Highest resolution Digital Elevation Model for the UK?

I need the most precise and highest resolution free digital elevation model for the UK. Would OS terrain 50 or ASTER GDEM be more suitable for view shed analysis?
0
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0answers
42 views

Radiometric correction of Aster Level 1T

We have to mosaic 70+ ASTER Level 1T imageries. I've splitted hdf data into 14 different tif's (3 VNIR, 6 SWIR, 5 TIR). As shown in the image imageries are of different time period. Question is, is ...
-1
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4answers
131 views

Why does ASTER create -0 to 0 instead of -1 to 1? [closed]

On my previous question on ASTER I need some more information on ASTER for time series analysis and I need to research on building NDVI because when I ran them for each ASTER. Most of them it came out ...
2
votes
2answers
75 views

How many ASTER scenes per year?

How many scenes are there for ASTER per year ? From what I understand is that the temporal is every 16 days. So, some month it will have 2 and some months it will have one.
2
votes
1answer
445 views

Using ASTER for time series analysis?

This is a follow up to Where to obtain free 15m ASTER image for New Mexico?. If I want to analyze 10 years or so, do I need to download each ASTER file for each year (e.g. 2003 ASTER, 2004 ASTER,...)...
1
vote
1answer
505 views

Error Message Orthorectifying ASTER Imagery in ArcMap 10 with DEM

I am trying to orthorectify ASTER imagery (VNIR, 15m resolution) in ArcMap using an ASTER DEM that I have downloaded from the GDEM website. The area is in the Andes, there are very high elevation ...
1
vote
1answer
550 views

Wrong values when merging raster files

I am trying to merge several (70 at least) raster files (a digital elevation model, ASTER DEM v2). I am using QGIS and I use the tool "Raster > Miscellaneous > Merge". I works well and I get the new ...
0
votes
2answers
3k views

Removing black background in ENVI

I am trying to compare two DEM products ASTER and SRTM v.3, but the ASTER has the black background which i think will interfere with my analysis. I don't have access to ArcGIS where I can do this ...
1
vote
0answers
204 views

ASTER DEMs multidirectional hillshades

I am trying to produce a multidirectional hillshade from ASTER DEMs in QGIS. basically I am trying to achieve something similar to this which is a screenshot from this layer https://services....
2
votes
1answer
279 views

How to align ASTER GDEM with Google Maps?

I'm using ASTER GDEM V2 to pick heights at lon-lat coordinates obtained from Google Maps but I found that at some locations - particularly San Francisco: https://goo.gl/maps/w7p1K - the DEM seem to be ...
0
votes
2answers
488 views

Get ASTER full bands file

I am having some problems on downloading ASTER data. When I download a Landsat-8 scene, it cames with the full bands on it (14 band files), an metadata file and a quality file. I need to download ...
2
votes
1answer
152 views

How can get correct elevation values from Digital elevation models

I am a bit new to spatial data analysis. I am trying to analyse elevation data for a coastal (almost flat) city with the highest elevation of about 30m. I have DEMs from ASTER, SRTM, and a DSM from ...
2
votes
1answer
314 views

How to create a Digital Surface Model using ASTER level 1A/B data?

I am working on estimating Canopy height of mangrove. I want to employ ASTER level 1A or 1B data to generate Digital Surface Model (DSM). But after I searched it in Google, I cannot find an existed ...
2
votes
1answer
48 views

detecting errors in DEMs

I'm generating elevation contours from the latest ASTER DEMs, which involves processing hundreds of tiles. Unfortunately, some of them have substantial errors, as seen in this colour relief from ...
3
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2answers
4k views

Getting incorrect slope values from an ASTER DEM in QGIS?

I have a DEM layer from ASTER satellite and I want to get the slope information from it. I use terrain analysis > slope, but the output is so wrong. Why is that? Here is the DEM: And here is the "...
3
votes
0answers
81 views

How can ASTER elevation data be converted to a CAD model? [duplicate]

I am trying to convert ASTER elevation data to a 3D CAD model using only opensource software. I have tried using different file formats but I have been unsuccessful. I use QGIS for my GIS work and ...
1
vote
2answers
47 views

How to create new raster from only the extreme scores of another raster? (Correcting errors in ASTER elevation data)

I'm fairly new to working with rasters. I found out that in my area the ASTER digital elevation data has a "bump" artifact in it, where there's a large (non existant in real life) bump in the ...
2
votes
1answer
142 views

Opening rrd file in ENVI 5.3

I have three files with RRD extension, which are data files for ASTER and I do not know how to open them in ENVI 5.3?
0
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2answers
109 views

Uncompressed size of ASTER DEM tile is 0 Bytes

I have downloaded ASTER DEM tiles(n=400), I have to merge/mosaic them. While doing so I got a problem with one tile which does not merge but displays correctly. I have downloaded it again but still I ...
1
vote
2answers
173 views

Error converting ASTER level 2 HDF to geotiff using Heg

I am trying to convert ASTER level 2 HDF files (AST_08 Surface Kinetic Temperature) to GeoTiff using the HEG swtif tool and a parameter file from the command line in Ubuntu. When I run the program I ...
1
vote
1answer
153 views

Working with SRTM DEM that has rectangular cells?

I am trying to work with the 1 arc second resolution SRTM DEM from USGS's Earth Explorer, with eventual goals of filling its no data areas with an ASTER grid (also of 1 second resolution). I have an ...
1
vote
0answers
70 views

Filling missing pixels of ASTER DEM

I need to perform hydrological analyses and map design purposes (hillshade creation) on a region far north. It is too northern to be covered by the SRTM DEM, therefore I am using the ASTER DEM. ...
2
votes
2answers
102 views

Selecting DEM that best determines shore line using ArcGIS Desktop?

I want to extract the shore line (Z=0) from DEM files. the earth explorer provides two DEM sources (ASTER & SRTM). In the following figure if the blue line represents the shore line as digitized ...
0
votes
1answer
46 views

Comparing ASTER/SRTM dataset in ArcGIS Desktop?

Currently I am working with two data set ASTER and SRTM. I want to check their accuracy with reference to toposheet. How would I do that in ArcGIS Desktop 10.4? I want to check accuracy in terms of ...
4
votes
2answers
2k views

How to manually edit 16 bit GDEM elevation data on a Geotiff file

I'm building a virtual 3D terrain scenery using both satellite imagery (google maps satellite) and elevation data from GDEM Aster elevation data (geoTIFF format files). My problem is that the ...
2
votes
2answers
563 views

Importing ASTER Data into ArcGIS

I have recently downloaded ASTER data from the glovis.usgs.gov website. The data was downloaded in a .HDF format and I have been unable to open these files in Arcmap, i'm using ArcGIS 10.4. When ...
1
vote
0answers
34 views

Evaluating tree model height before and after fire in QGIS?

I have downloaded ASTER images of one area in Aosta Valley. In 2008 fire occured. I have images from 2006 to 2016. How can I estimate the vegetation, precisely tree height before and after the fire?
1
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0answers
130 views

Reading L1B ASTER in GRASS using r.in.aster

I'm having a problem getting an ASTER L1B to be read in GRASS using r.in.aster. The output the command shows this: (Wed Apr 8 17:49:03 2015) Command finished (1 sec) (Wed Apr 8 17:49:37 2015) ...
0
votes
1answer
157 views

Cloud and cloud shadow masking for old LANDSAT and ASTER images in GRASS

I am trying to remove cloud and cloud shadows for Landsat 4-5 ASTER images in GRASS GIS. I have knowledge that detecting cloud and cloud shadow pixels which is >(255*0.2), but I cannot figure out ...
2
votes
3answers
3k views

Using .tif files to get elevation and slope in ArcMap? [closed]

I'm using ArcMap 10.3 on Windows 10 and I have the 3D analyst, ArcScan, Geo-statistical analyst, network analyst, publisher, schematics, spatial analyst and tracking analyst extensions. I have a ...
1
vote
0answers
264 views

Opening *.hdf file from ASTER in QGIS? [duplicate]

I am trying to open *.hdf file from ASTER in QGIS and it can not recognize CRS. Does anybody knows solution to this?
0
votes
1answer
83 views

Selecting granule from ASTER Global DEM V2

I am following this tutorial in order to download ASTER Global DEM V2 data: http://www.echo.nasa.gov/reference/reverbastergdem_tutorial.htm on http://reverb.echo.nasa.gov/reverb/ Step 7 is to "Select ...
7
votes
2answers
1k views

Choosing DEM in France?

I'm working in France. I thought the TanDEM-X was a free and open DEM but that does not seem to be the case. According to a few websites, the most famous free DEMs seem to be ASTER GDEM, SRTM, X-SAR ...
1
vote
1answer
28k views

Opening TIFF DEMs in QGIS

I have files, in Tiff format, downloaded from ASTER-GDEM. Can I open this file with QGIS? If yes, how?
1
vote
1answer
96 views

Neighborhood analyses with GRASS/QGIS using ASTER GDEM

I have a problem related with this question (Old question without answer: R.Neighbors with large neighborhoods?). Basically, I want to estimate roughness of a given area, for which I was using QGIS, ...
5
votes
2answers
3k views

How to properly open an ASTER data?

Yesterday i downloaded an Aster L1B image from USGS's website. If i load it in QGIS, it doesn't get displayed properly(location wise). Even after i've enabled "On the fly" option, it's not reading the ...
3
votes
2answers
568 views

Filling voids in ASTER stereo-images for DEM generation using ArcGIS Desktop?

I'm trying to use a stereo-pair of ASTER images to generate a DEM (in ERDAS Imagine). However, the mountains are rather cloudy and the images can't be used as they are. But the relevant parts (valley ...
1
vote
0answers
122 views

Calculating aspect in flat areas in ASTER DEM with ArcGIS for Desktop?

I have an analyzed aspect surface from ASTER DEM 30m resolution in ArcGIS 10.2. But it shows many aspects in flat area.Normaly it must calculate this are as flat (-1). How can I resolve this problem?
0
votes
1answer
170 views

DEM data processing

I downloaded ASTER GDEM Tiles and mosacked them in ENVI. After that I exported the Mosaic in tiff format and I opening it in Arcgis, the image is gray all through but the pixels are showing correctly. ...