A series of Earth-observing satellite missions jointly managed by NASA and the U.S. Geological Survey.
0
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0answers
33 views
After pansharpening LANDSAT 8 in GRASS, poor colour visualisation in QGIS afterwards
Having used QGIS for quiet some time for mapping, I was 'forced' to dig into GRASS as pansharpening is not directly executable in QGIS. After understanding more or less the structure, I did some ...
1
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0answers
33 views
Is the 2010 Landsat world map (GLS 2010) available in a GoogleMaps browser?
Is the 2010 Landsat world map, also known as GLS 2010, available to view anywhere on the internet in a GoogleMaps browser?
I need to find it so that it can be added as a layer to a GoogleMaps ...
0
votes
0answers
18 views
Is Terrain and Topographic Correction the same for Landsat8?
Landsat 8 L1 products are "Terrain Corrected",
that said it means that are they already "topographically corrected", like both words are synonyms or you need to apply correction techniques as well? ...
2
votes
1answer
45 views
Atmospheric Calibration for Landsat 7 ETM+ Gap Filling
This is for thesis work involving mapping of above-ground mangrove forest biomass using Landsat 7 ETM+ imagery.
I am assessing correlations between biomass with vegetative indices, e.g. NDVI, and ...
2
votes
1answer
57 views
Questions regarding the processing of mosaic Landsat 8
Approximate Translation of Original Question:
A question of theoretical and practical about the mosaic of satellite images. I have 3 different months of Landsat images, which need to accomplish the ...
6
votes
1answer
1k views
How to fill gaps in SLC-Off Landsat 7 ETM+ Images with QGIS?
Explanation of the problem:
On 31 May 2003 the Landsat 7 Enhanced Thematic Mapper (ETM+) sensor had a failure of the Scan Line Corrector (SLC). Since that time all Landsat ETM+ images have had ...
1
vote
0answers
58 views
How to mask clouds in ER Mapper?
I am using ER Mapper. But, I'm still confused how to detect and mask the clouds.
I want to reduce or eliminate the cloud to perform supervised and unsupervised classification.
13
votes
6answers
353 views
What is the best/easiest way to obtain temporal Landsat imagery?
It's been awhile since I've dealt with optical imagery. I need to perform a land cover classification at mid-latitudes using several LANDSAT scenes. I've noticed that some online tools are still ...
3
votes
5answers
157 views
Which methods are most suited to classifying urban areas from Landsat imagery?
I am trying to use Landsat data to map urban extents over time. I need to perform a classification into built up / non built up areas. I am new to image classification. I have access to the following ...
2
votes
0answers
44 views
How to analyze the signatures for a Landsat clasification with Sextante in Quantum Gis
I’m defining my training data for a Landsat classification. I´m digitalizing the polygons with the field data in QGis and I want to analyze the signatures of the Landsat images to avoid errors. In ...
10
votes
1answer
223 views
How to Remove Dark Bands Where Scenes Overlap in Mosaic Landsat TM5 Image?
I have an image mosaic of 5 Landsat TM5 scenes. Where the scenes overlap there is a dark band, only on the left and right sides, but the top and bottom are seamless. What is the best way to correct ...
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votes
0answers
37 views
how to convert the L1G raster file to geo tiff,
I have downloaded I mage from GLCF, its in LG1 format, how I can process that image in erdas software, or is there any methods to convert it into geo tiff,
1
vote
1answer
64 views
trouble with i.landsat.toar failing to identify satellite
I am trying to use the i.landsat.toar tool on L7 bands. I have tried to use both the MTL and MTLold, but no matter what I try, it returns "Failed to identify satellite." What am I doing wrong?
15
votes
3answers
1k views
Which remote sensing satellite is best used for vegetation extent mapping
I'm currently writing an assignment for my remote sensing class and while I think I have correct answer was wondering what people who do this stuff for a living think.
The question is: which satilite ...
0
votes
0answers
56 views
GRASS i.landsat.toar returns empty raster
I am trying to use the GRASS module i.landsat.toar.
Currently the files created are empty and it spits out:
So it seems that it is not picking up something? The location is set to the extent of ...
6
votes
2answers
162 views
Extracting roads out of Landsat raster images
For a study into the expansion of road networks in the rainforest I am trying to extract roads out of Landsat images. We already have sharp and cloud-free composites on which the roads are clearly ...
3
votes
0answers
170 views
Polygonize vegetation area from Landsat7 RGB using QGis / Bilko?
I'm trying to extract the areas with vegetation as a polygon-shape from a landsat7-image, 30m resolution, RGB, using QGis 1.8 or Bilko or (hopefully in the near future) ArcGIS. The area is in Northern ...
4
votes
2answers
377 views
How to trim Landsat 5 scene edges
I have a bunch of Landsat 5 scenes that I want to mosaic together.
However Landsat 5 scenes have a zigzag pattern on the left and right edges as well as some bad data values along these edges.
Is ...
15
votes
6answers
423 views
What are people using LANDSAT data for?
Obviously it's potentially a very powerful tool, but I'm curious as to what practical applications people are using it for?
Admittedly, this is a very broad question... The reason I ask is because ...
5
votes
2answers
399 views
Moisture Interpretation from Landsat Images
I am working on a "land suitability for crop" project. Can anyone let me know how to get any type of information which can be related to moisture index of soil?
I have Landsat 5 data with band 3 and ...
2
votes
1answer
143 views
Convert map to use space oblique mercator projection
I have a map document in ArcMAP which I want to convert to using Space oblique mercator projection, but not sure if ArcMap supports it. Any hints on how to achieve this?
thanks!
5
votes
1answer
215 views
How to color-balance false-composites of pan-sharpened Landsat images in GRASS?
Whenever I try to pan-sharpen composites of some Landsat images in GRASS using i.pansharpen, i.fusion.brovey or the IHS sharpening method, the output will have some or all of the following ...
6
votes
1answer
333 views
How to pan-sharpen Landsat images for image-classification in GRASS?
I'd like to learn how to do an unsupervised classification of a Landsat scene using i.cluster > i.maxlik in GRASS using pan-sharpened 15m-resolution images (the example given in its Wiki uses the ...
6
votes
1answer
177 views
How to increase mask buffer and then offset it using r.mapcalc in GRASS?
I'm in the process of learning on how to remove clouds and cloud-shadows from Landsat images using GRASS. So far I was able to remove a lot of clouds from those images using i.landsat.acca, but it ...
2
votes
2answers
298 views
How to convert Landsat L1G raster to Geotiff?
Is it possible to convert a Landsat L1G raster file like L71001070_07020000728_B30.L1G to Geotiff using free software?
3
votes
1answer
71 views
What proportion of the 240m area sensed by MODIS must be forest before it is defined as forest?
MOD12 is a MODIS product at 240m resolution. Landsat produces 30m resolution products, which I resampled to 240m resulting in a raster of proportion forest cover in each 240m pixel (based on the mean ...
9
votes
1answer
341 views
How to compare aerial and satellite images for land use analysis?
I am interested to compare the land use-cover dynamics for four periods: 1950s, 1980s, 1990s and current for a certain area having a max size of 5000 ha.
For the first three periods detailed aerial ...
5
votes
6answers
379 views
Southern hemisphere projections for Landsat upsets GRASS
Hi All
does anyone have the last word on why Landsat scenes don't project in the southern hemisphere. This causes no end of trouble in GRASS, less so in QGIS.
What I mean is, take an original scene ...
