Questions tagged [aster]

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

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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 "...
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 ...
5
votes
1answer
5k views

Open Source Alternatives to ERDAS IMAGINE ATCOR?

I have been using ERDAS IMAGINE's ATCOR extension for ATmospheric CORrection of ASTER imagery. What opensource options exist for atmospheric correction of ASTER Level 1B products? I'm primarily ...
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 ...
2
votes
1answer
145 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 ...
1
vote
1answer
27k 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?
2
votes
1answer
442 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,...)...
2
votes
3answers
1k views

Where to obtain free 15m ASTER image for New Mexico?

I am looking for a free Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) image that will let me to perform NDVI for the pilot crop health/soil moisture that can go as far back ...
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 ...
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 ...
2
votes
1answer
145 views

Why does same image in two ArcGIS ArcMap configurations show different extent numbers?

I would like to get hear from you about the situation I am seeing here. What It got my eye was that when I download an ASTER from Reverb/ Echo from USGS website. At work, I load my ASTER file to my ...
2
votes
2answers
73 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.
1
vote
1answer
727 views

How to import and project ASTER 1B data into Arcmap?

I recently purchased a granule of ASTER 1B data from ERSDAC, when I import any of the associated rasters into ArcGIS, the image is displayed as being only 1m across, when the actual area represented ...
1
vote
1answer
502 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 ...