A series of Earth-observing satellite missions jointly managed by NASA and the U.S. Geological Survey.

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2answers
87 views

Creating a mosaic from multiple Landsat scenes on Qgis

I wish to produce a large image. As a base use cloud free regions of multiple Landsat images. I wish to keep the bands and be able to work with the generated mosaic just like a "normal" Landsat image. ...
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1answer
311 views

Is the reflectance required to get the NDVI, for Landsat 8 images?

I'm a beginner in satellite optical imagery. I have a landsat 8 image (11 bands downloaded from http://earthexplorer.usgs.gov/) for which I need to calculate the NDVI (Normalized Difference Vegetation ...
3
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1answer
37 views

Landsat 8 images acquisition_date

I need to know the exact date of image acquisition for NDVI purpose, the date on image name is " LC80920852014222LGN00" is in Julian date, but in meta data it says"acquisition_date>2014-08-10" , I ...
2
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2answers
99 views

landsat-util zip files

I've just started using landsat-util and am having a couple of problems. First of all, the standard download command only downloads Bands 4,3,2 (the visible bands) and the QA band. In the docs it says ...
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0answers
55 views

applying Image regression in landsat image

I have two different date of Landsat image.I want to do change detection using image regression method.Is it possible to do image regression in Erdas Imagine or ARCGIS? How can I develop a model for ...
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1answer
125 views

Determination of Soil Moisture for a Region Using open Source Data

I want to derive soil Moisture for a region using Landsat and Microwave data could you please help me with the procedure.
1
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1answer
101 views

Inserting landsat image WMS to MapServer map file? [closed]

I am trying to insert this landsat image to my Mapserver map file. However, I can not manage it. Does someone have an idea? Landsat image WMS information: Landsat from onearth.jpl.nasa.gov Bounding ...
3
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2answers
118 views

Atmospheric correction of Landsat images

In satellite imagery, isn't cloud removal supposed to be performed while atmospheric correction? My question arises from the fact that even though these Landsat images are atmospherically corrected, ...
1
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2answers
89 views

Improves performance on R working with raster files

I´m trying this code to look for NA and negative pixel values and replace it for 0. But it´s too slow. Any tip for improve the performance of it? "all.files" is a list of address of the images. "r1" ...
2
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0answers
103 views

Calculating Aerosol optical thickness from Landsat 7

EDIT I have added question down I am reading one paper and I found method to retrive AOT from landsat 7 image This should be simplifield equation, because they assumed observation zenit as 0. Than ...
1
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2answers
119 views

Pan sharpening with surface reflectance data

The surface reflectance data for landsat 8 is only available for bands 1-7 (via EPSA bulk download). I want to pan sharpen surface reflectance data. But I don't have a surface reflectance band 8 (pan ...
2
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3answers
175 views

Search and concatenate Landsat bands with Python

I have a number of Landsat geotiff (*.TIF) file in a folder. The problem is simple, I need to search certain Landsat bands from that list and make a composite tif image. I am using Orfeo Toolbox's CLI ...
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0answers
948 views

Reading, modifying and writing a geotiff with GDAL in python

I'm trying the learn the ropes of Remote Sensing image processing using Python GDAL bindings and numpy. As a first attempt, I'm reading a Landsat8 geotiff file, do a simple manipulation and write the ...
3
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2answers
109 views

How to remove bounding box extents based on reflectance values of the image of Landsat8 by using R programming

I have taken the reflectance image from Landsat8 bands. Now the extents of bounding box showing negative values , to proceed to my next level of the process i need to remove this negative values and ...
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1answer
20 views

Use Landsat imagery to create NAIP equivalent

I was wondering if anyone knows if I may be able to create a NAIP equivalent using Landsat imagery. If so, how?
0
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0answers
47 views

Achieving consistent RGB Composite Settings using ArcPy?

Does anyone know if there is an arcpy tool so that when I bring in raster imagery (Specifically Landsat) into ArcMap it will automatically adjust the settings of the RGB composite? I know under ...
2
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1answer
122 views

Image footprint in Landsat mosaic using GDAL?

I need to produce a Landsat mosaic over part of Indonesia and an extra shape file containing the dates of each part of the mosaic. The steps I used are: Stack 3 bands to produce RGB image Project ...
0
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0answers
50 views

Landsat images from same path/row have different shapes

I'm starting to play with satellite imagery. In particular, I am using images of the Landsat 7 and Python. I open two TIF images of the same place but at different times to the numpy arrays and they ...
2
votes
1answer
112 views

GRASS: Landsat 8 GeoTIFF import error

I'm trying to import some Landsat 8 GeoTIFFs into GRASS (in QGIS), and I can't work out why I'm getting this error, or how to fix it. No amount of Googling has been able to tell me anything at all. I ...
1
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1answer
65 views

Checking the registration accuracy of already-orthorectified images

I acquired several Landsat 5-8 images corrected at Level 1T. I also have aerial ortophotos of the same area. From a visual assessment the co-registration between the images seems good, but I need to ...
0
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1answer
194 views

Is there any packages to download landsat image by shapefile boundary in R or python? [closed]

I want to find a package which can automatically download images within a predefined administration boundary (shapefile format). Does anyone know a package can conduct or simplify the process?
4
votes
1answer
119 views

Determining the best month for discriminating between different vegetation types?

I ordered and downloaded several (Surface Reflectance) Landsat 5-8 images from USGS Earth Explorer with the purpose of choosing a few of them to calculate some Vegetation Indices for each (NDVI, SAVI, ...
0
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1answer
159 views

Why do pixel (cell) values change for 32 real NDVI values when taking from Multispec to QGIS?

Landsat 5 values change from normal NDVI -1 to 1 when created in Multispec as a 32 bit signed data image. When adding the raster layer in QGIS, the value range changed to 0-255. How does one ...
4
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1answer
47 views

What is the “t” in i.landsat.toar

I'm using GrassGis 7.0.0 for Landsat imagery. In the description of i.Landsat.toar under dos3 and dos4 is: TAUz = exp[-t/sin(e)] What is "t"? I cannot find any description about what it is. Can ...
2
votes
1answer
307 views

Difference between a spectroradiometer and multispectral sensor

Let's take as an example of a spectroradiometer MODIS, and as an example of a multispectral sensor the Landsat8 (OLI). What is the difference between these two sensors? Should we compare a ...
2
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0answers
55 views

Important to perform atmospheric correction when attempting to identify coral reefs?

I want to identify coral reefs using multi-temporal Landsat data and Lyzenga's Transformation method. In relation to pre-processing the image, should atmospheric correction be done or not? If not, ...
0
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0answers
53 views

Geometric correction using topographic maps?

I am researching LULC change detection using Landsat 7 etm + image in 2000 and Landsat 8 image in 2014. Both are L1T images. Do I need to do geometric correction using topographic map for my study ...
0
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0answers
79 views

DEM input problem using ARCSI Landsat 8 batch processing

I'm trying to use ARCSI in Linux to process a batch of Landsat 8 images. I'm using the arcsibuildcmdslist.py to build the arcsi.py final command. I'm having problems in the input DEM (http://...
3
votes
1answer
385 views

Is atmospheric correction necessary when working with multi-spectral indexes?

When you are working with Landsat Level 1 data and calculate indexes, e.g. NDVI, NDBI, SAVI ..., do you calculate them using raw data (pixel DN value), or atmospherically corrected data (surface ...
1
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0answers
25 views

Change detection between two Landsat scenes? [duplicate]

I want to do time series analysis and find change in NDVI. I have rasters where each pixel is represented by some value at a time. Also I have same thing but represented by points. And I would like ...
2
votes
2answers
631 views

How to atmospherically correct Landsat 8 data?

What is a simple way to atmospherically correct Landsat 8 data using Erdas 9.3 or ArcGIS 9.3?
2
votes
1answer
94 views

Landsat Surface Reflectancce product Python packages

I have to work with numerous Landsat surface reflectance product that I downloaded from http://landsat.usgs.gov/CDR_LSR.php. The product comes with a QA data with information on clouds and shadows ...
2
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2answers
263 views

NDVI from Landsat8 LandsatLook images

I have downloaded landsat image from this site and now Im wondering if i can get NDVI index from it. In raster calculator I have only 3 ranges, shouldnt be four? Or am I doing something wrong......
1
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1answer
197 views

Calculating climatological albedo using MODIS satellite images?

My question is based on the paper Using NOAA AVHRR and SPOT VGT data to estimate surface parameters: application to a mesoscale meteorological model. The authors have calculated albedo, surface ...
1
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2answers
72 views

Unable to set raster surface resolution in ArcScene?

I have a 3-band subset of a Landsat image which I want to display in ArcScene (of ArcGIS version 10.2.1). The image is 30 meter resolution and I am draping it on a 25m resolution Aster DEM. But have ...
0
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0answers
74 views

Landsat 7 SLC off gap-filling

Please suggest me how can I fill the gap of SLC off Landsat 7 data band 8 that is panchromatic band. Also suggest me is there any method to fill the gap of all other bands too.
1
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1answer
183 views

The stability of randomForest models after increasing predictor variables

With reference to the posts: Incorporating terrain data to predict canopy cover using randomForest in R and Random-Forest Classification of 10cm Imagery for species-distribution in R (no point-shapes) ...
4
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2answers
174 views

Random Forest to estimate land use in past with Landsat

I am new in Machine Learning and in R. I am working in my Master thesis. I am trying to estimate the LULC of the years 1984, 1990, 2000, 2011, 2014 for characterizing the forest dynamics. I have for ...
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0answers
15 views

Using QGIS to create a single # band raster Image [duplicate]

I recently downloaded some Landsat Images. They are in GeoTIFF format. The images are in the different bands. How can I combine them for example if band 1 is Red , band 2 is green and band 3 is blue, ...
0
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1answer
18 views

Move Landsat 7 Image in Grass 7

I got 2 landsat 7 images from the same place but different date of adquisition, image A is well placed, but image B is shifted about 1500 meters east and 14700 meters north. I need to use both images ...
5
votes
0answers
664 views

RGB satellite image in Python with Basemap

Can anyone recommend a workflow or python library that will let me work with RGB images and BaseMap (or something equivalent - could be CartoPy). I have Landsat 8 images, and can load one in python ...
1
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0answers
84 views

Landsat Data to Map Slums in India

I am working on a project to answer the following geographic question: How much have slum areas increased in Mumbai, India, since the 1970's (or earliest data). I have downloaded LandSat imagery and ...
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0answers
64 views

How do I use Multispec for Landsat data?

It seems that I only can use the Clustering if I want to cluster only one band data.. If I open up more than 1 band (in one image), the cluster toolbar is disabled? optional: Is there any free ...
0
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1answer
117 views

Resolution problem

I have a Landsat TM image and in QGIS I used Clipper to crop my image. Then, I tried to reprojected it via Warp (Reproject) and the pixel size goes 29.9936,-29.9936. I do not understand why this ...
0
votes
1answer
71 views

Landsat oli mosaicking for LULC classification

I have to classify land use land cover data for western ghats- 1,07,770 sq km area.The landsat images for the area cover 15 tiles . I have to use minimum cloud cover images . But for the same the ...
0
votes
1answer
170 views

Removing salt and pepper effect

In a land cover raster (categorical map) that is a product of classified satellite image, what is the best way to remove "salt and pepper" effect from the image after classification. I am not ...
1
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2answers
495 views

Band conversion from different landsat imagery (Landsat 5,7 and 8)

I am mapping mangrove areas over time (from 2003 to 2014 ) and thus use different landsat imagery. Band combinations i use and am satisfied with in Landsat 7 include band: 4,5,3 4,5,1 7,4,2 when using ...
0
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1answer
388 views

Creating histogram/statistics/scatterplot by classification tool in ArcMap?

I'm currently working on a land cover classification with Landsat 8 imagery. I already subjected the imagery to pre-processing (atmospheric and topographic correction) and I mosaiced two images. Now I ...
0
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0answers
120 views

setting null values to 0 Landsat 8 Grass 7.1

I am working with Landsat8 images and need to run the albedo function in Grass 7.1.svn. In order to do this, I need to set the null values to 0 to eliminate the black border around the images. This ...
1
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1answer
252 views

Export of group = multiband raster to another format not works in GRASS

I am really new in GRASS and my question is really basic but I dont realize where I am wrong. I have a set of single layers in my PERMANENT from some Landsat images (1 landsat = 7 one layer rasters)....