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

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-3
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0answers
28 views

4 sequential Landsat image cant be merged into one single file, in QGIS. how to solve this issue?

i am trying to create land-use, land cover classification by QGIS. i have Landsat images downloaded from earth explorer. these are *.tiff files. but my region is not covered by single pic. thats why, ...
0
votes
0answers
47 views

Making NLCD92-styled land cover image from Landsat Images

I'm still fairly inexperienced with using qGIS and handling different image file types. Things I have completed: With a plugin called Semi-Automatic Classification Plugin, I was able to download ...
0
votes
0answers
59 views

Login to USGS Earth Explorer and download Landsat imagery with Python

I want to login to the USGS Earth Explorer website at http://earthexplorer.usgs.gov/ with Python and download imagery from the Landsat Archive collection just by giving it username,password,path/row (...
1
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0answers
23 views

Crop/ forest/grass classification in Erdas

I am trying to calculate crop land, forest and grass land to check the irrigation potential during the period from Landsat 8 image using supervised classification in ERDAS. I am finding difficult to ...
2
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1answer
45 views

Error in lansat 7 image

The actual shape of lake is like in the right corner, but in lansat 7 image that i downloaded a strip is misplaced(left image) or shifted.][how can i correct this, i have tried georeferencing already ...
0
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1answer
112 views

How to Calculate NDWI Value in Arcgis 10.1?

I want to delineate surface water feature of my Landsat raster image and also want to calculate the area of water body. I have learned through internet that NDWI can be used to delineate open water ...
1
vote
1answer
29 views

Landsat 8 composite image using different resolutions?

I have created a composite image of Landsat 8 using bands 2 to 7 (blue, green, red, NIR and SWIR) using ArcGIS 10.1. For bands 2-4, I've pansharpened them to 15m spatial resolutions using the ...
1
vote
1answer
10 views

Problem with numeric variable in i.topo.corr

I have a script to do topographic correction on landsat images. Following the manual, I first have to create the illumination model. I do it with the following line: i.topo.corr -i --overwrite ...
0
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1answer
39 views

modis surface reflectance

I wanted to perform atmospheric correction using MODIS surface reflectance products for validating my atmospherically corrected images (from Landsat 8). As Landsat 8 only became available in 2013, is ...
-1
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2answers
39 views

How to use Landsat 8 or MODIS products to classify land area

Anyone know of a good tutorial where I can learn how to use satellite vegetation imagery from Landsat or MODIS to classify which crops are grown where over time for a West african country. I don't ...
0
votes
1answer
45 views

Resampling Landsat 8 band 8 to 30m resolution (to same res as other bands)

I'm running a script in Matlab where I need to compare different Landsat 8 bands. The matrices of each band must match up, but I'm using band 8 which is at double the resolution of the others, and ...
1
vote
2answers
30 views

Gdal vsicurl not working

I'm currently using gdal version 1.11.2 (also tested this on 2.0.0) to open AWS Landsat-8 data directly from its url. If I manually test the link in the browser, it works. If I use /vsicurl/ the ...
0
votes
1answer
30 views

Comparability of Landsats

I have collected data (spectral bands) from Landsat 4-5 and Landsat 8. I was calculating NDVI when I noticed that the two Landsats have different band numbers designated as Red and Near Infra Red (...
0
votes
0answers
17 views

Single channel Change Detection

I want to write script for Google Earth Engine, which will create bitwise mask of changes. Earlier I made through ScanEx Image Processor and this function is called "Single channel change detection". ...
1
vote
1answer
82 views

Image stacking with Python/Gdal

I am trying to accomplish some image stacking task in python. I am not proficient in Python and was hoping I can get some guidance to get started. So I have large number of landsat images. Landsat ...
0
votes
0answers
24 views

Problem with i.landsat.acca on GRASS

I have a problem with my Landsat Tree Cover Continuous Field. The images are fully of clouds and shadows, so unreadable. The problem is the following: when I try to use i.landsat.acca to remove ...
2
votes
0answers
43 views

Negative reflectance values after topographic corrections (cosine correction and modified Minnaert correction)

I am trying to manually correct the surface reflectance values of some Landsat 7 and 8 images. I'm using Minnaert modified method, which uses the cosine correction as one of its inputs (see below the ...
1
vote
3answers
102 views

What preprocessing is required when using Landsat for LULC?

Can anyone help me regarding the what kind of image pre-processing techniques should be used for the landsat images downloaded from http://earthexplorer.usgs.gov/ to create land-use land-cover (LULC) ...
2
votes
0answers
34 views

How do I report area statistics for land cover classes at equal sections along a river?

I have a river outlined: Using QGIS, the Semi-automatic Classification plugin and Landsat 8 images I classified the habitats (blue=water, yellow=sand/rock...,green=vegetation/algae) inside the river ...
1
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0answers
55 views

Layer Stack 6 Landsat8 bands

I have 6 images from Landsat 8 (Green,Red,NIR,SWIR1,SWIR2,NDVI). When I want to layerstack them with "Merge" I always get a result tif which is just black and white, however I can see that all 6 bands ...
1
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0answers
26 views

Positioning Landsat 8 data in Google Earth

I have some (combined) Landsat 8 TIF files that I want to overlay in Google Earth Pro. I manually set the 4 corner lat/lon coordinates (Properties->Location) to the 8 CORNER_UL_LAT_PRODUCT, ...
1
vote
1answer
43 views

Spatially matching Landsat images in ArcMap?

I'm trying to look at the desiccation of a lake over a number of years using images from different Landsats. However when I import the different years into arcmap they are completely unsynchronized. I ...
0
votes
0answers
65 views

Right Orfeo Toolbox Segmentation input

I made this tutorial. I used Landsat 8 bands (1-7), which I atmospheric corrected with DOS and converted to 8bit. After that I layer stacked the pre processed band (1-7), clipped a little part with a ...
1
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0answers
25 views

Clip Layer Stack

I layer stacked the Landsat 8 Bands (1-7) in QGIS and made a polygon shapefile. Every time I try to clip my layerstack with the Mask layer I just get a completely black output raster. I want to use ...
0
votes
2answers
58 views

Landsat 8 cloud detection without band 9

What is the best possible way to create a cloud mask of a Landsat 8 scene without using band 9? I think the best way will be to determine the cloud cover by thresholding in the Panchromatic band and ...
0
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0answers
41 views

Download USGS satellite images of a city only

I need to download the satellite images of a city for land change detection. Specifically I need to show urbanization trends and predict the future expansion. Now I can't seem to download just the ...
0
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0answers
35 views

Is there an automated way of downloading the natural color .TIF images for Landsat 8?

I know that .jpg natural color images can be downloaded from AWS. But, .jpg doesn't contain the world metadata along with it.
3
votes
0answers
16 views

Snapping vectors to vertices for ROI delineation?

I am trying to manually extract a set of ROIs in ENVI 5.0. However, I can't seem to successfully line up the vector to be flush with the boundary of the pixels, which means I don't have fine-tune ...
2
votes
2answers
54 views

Pansharpening influence on analysis

Using as an example Landsat 8 bands: Does pansharpening band enhace only visible range and therefore can I use it only for analysis connected with visible spectrum? Or I can pansharpen every possible ...
0
votes
0answers
18 views

Which sensor can provide PAR values for GPP/NPP estimation and how to retrieve that

I have to estimate gross as well as net primary productivity of a needle leaf temperate forest ecosystem using a Landsat image. Which sensor can I use to retrieve PAR values since I don't have any ...
4
votes
0answers
41 views

Ice type differentiation using satellite data

I would like to classify glacial area by categories of snow (if there is) and ice, but what's most important: between old ice and fresh ice. They have different properties that are possible to ...
0
votes
0answers
16 views

glcm texture in R (mean_Envi)

I am running a Image texture measures from grey-level co-occurrence matrices (GLCM) using the glcm package in R and I would like to know what is the difference between mean' and 'mean_ENVI' / '...
2
votes
1answer
49 views

LANDSAT 8 Resolution too low for coastline difference measurement?

I recently extracted coastlines (for my master thesis) for a Bangladesh region for the years 2013 and 2014. Regardless of the method I used, the distance between the 2 coastlines was always the same: ...
6
votes
1answer
164 views

Difference between Landsat 7 and Landsat 8 TOA reflectance computation

In section 3.1 of this article it is explained how the Top of Atmosphere Reflectance for Landsat 7 and Landsat 8 are computed. The equation for Landsat 8 is not mentioned explicitly, but can be found ...
2
votes
1answer
127 views

Extract coastline as a vector from landsat 8 imagery?

I am trying to detect some sea level rise/fall for a specific region, from Landsat imagery. I went through the recommended methods of identifying water/land (MNDWI, AWEI, Bandratio 5/2, etc.). Now ...
0
votes
1answer
46 views

How to know what is the correct ESPG code for clipping Landsat imagery?

This is somewhat related to a previous question of mine. My goal here is to clip Landsat imagery to a rectangle that I've defined by four points of latitude and longitude in WGS84. To do this, I've ...
3
votes
0answers
46 views

How to use a conditional logic on Impervious Mapping

I am trying to use a logic ( rule -based classification ) to extract built-up area, similar to as suggested by Xu (2007).He uses, three spectral indices, SAVI( Soil Adjusted Vegetation Index), NDBI ( ...
4
votes
1answer
104 views

Pan sharpening of SPOT and Landsat images

Is there a way I can pansharpen SPOT and Landsat images? I have Panchromatic bands from QuickBird and WordlView-2 images and would want to pansharpen Landsat and SPOT, while still retaining features ...
0
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0answers
9 views

Can grass 7.0.3 pansharpen Landsat 8 spectral bands [duplicate]

Can grass 7.0.3 now pansharpen Landsat 8 rgb spectral bands. The last post in 2013 said that a programmer was working on it.
1
vote
1answer
20 views

Metadata landsat incompatibility?

I compiled the last ledaps from source, but when I try to convert the MLT file to the espa xml format I get this error: Error: read_lpgs_mtl : Unsupported resampling option: CC It turns out that ...
4
votes
1answer
70 views

Misalignment of a lot of landsat images

I am new to Landsat images processing, and I'm trying to create land cover change maps over an area covering around 15 landsat scenes. I downloaded all scenes available, unfortunately some layers don'...
-1
votes
1answer
108 views

Estimation of Land Surface Temperature using ENVI 5.2

I am doing research about land surface temperature using Landsat 8 image. However, I have a problem with them. I have read literature but i can not do it in ENVI 5.2. Could you help me step-by-...
2
votes
1answer
37 views

Getting exact maximum daily temperature using remote sensing?

I have a problem I want to find the land surface temperature of Bangkok using landsat8. I have everything to get it but the problem is landsat images are obtained during morning time but the maximum ...
3
votes
0answers
80 views

How to remove black pixels in Landsat image

Does anyone know how I can remove these black pixels around the edge of this Landsat image? They appeared when I layer-stacked the bands in ERDAS IMAGINE - they were not there in the separate band ...
1
vote
0answers
63 views

Grass i.landsat.acca says image is cloud free but it is not

I'm working on an area in Amazonia with high cloud persistance which makes global data on land cover quite useless at small scales, so I wanted to learn to process my own Landsat images, with GRASS ...
5
votes
3answers
241 views

Differentiating bare soil and urban areas in Landsat 4-5 land cover classification?

I am trying to classify a Landsat 4-5 image using the semi automatic classification plugin (QGIS). I always get misclassifications between bare soil and urban areas as they have similar spectral ...
0
votes
1answer
138 views

Land Surface Temperature

Estimation of Land Surface Temperature Contact measurements of emissivity values of the surfaces using thermal radiometers and spectral assessment of samples supplementedLST estimation procedures ...
0
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2answers
65 views

Which one is best for atmospheric correction?

My aim is to determine surface temperature extraction by computing NDVI from Landsat 7 and Landsat 8. suggest me which method DOS (dark object subtraction) or FLAASH atmospheric correction in ENVI ...
3
votes
2answers
434 views

Classify forest with NDVI from Landsat 8 and 7

I'd like to calculate the NDVI for multi-date satellite images of Landsat (7,8) to perform a change detection on the deforestation of the Amazon rainforest. I already acquired surface reflectance ...
1
vote
1answer
186 views

Tutorial Vegetation Condition Index

Anybody here can help me regarding calculating Vegetation Condition Index (Kogan,2004) for Landsat?. Specially facing problem in NDVI_max and NDVI_min; which should be maximum and minimum value?