Questions tagged [landsat-7]
The 7th satellite in the Landsat program.
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Is Sentinel-2A Band 8 (NIR band) has been affected by earth water vapor absorption feature?
I am starting working with S2A images. While looking at the bandwidth of S2A NIR band, it seems it has a wider area as Landsat-7 ETM+ NIR band. Previously I worked with L7 ETM+ NIR band and obtained ...
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0answers
27 views
Labeled training data for water extraction/classification
I'm working on a small project to extract water features from satellite images. In particular, I plan to use Landsat 7 ETM+ satellite images of a particular lake (it's on plain land). I have decided ...
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1answer
23 views
Integrating Landsat ETM+ and OLI surface reflectance data
I want to do a time-series analysis on Landsat surface reflectance data for an extended period of time (2005-2018), which requires integration of Landsat 5, 7, and 8. Is there any procedure to make ...
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0answers
26 views
Understanding Landsat 7 Layer Properties
I have a Landstat 7 band 1 layer and am trying to understand exactly what it is showing. Specifically, if I go to the layer properties, under source there is an "Extent" section which shows 4 numbers,...
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1answer
123 views
Treatment of Landsat 7 SLC error in Google Earth Engine?
Google Earth Engine distributes Landsat 7 image composites of indeces such as NDWI and NDVI that, when averaged on a shapefile, give back a coherent value.
But how is SLC failure treated by it https:/...
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1answer
101 views
Cloud Mask Landsat 7 Tier 2 TOA
I am trying to create a decent cloudfree mosaic of Landsat 7 Tier 2 TOA reflectance around the Amery Iceshelf in Antarctica. I did find a good script for landsat 8 TOA (Apply a cloud mask to a ...
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1answer
27 views
Radiance Calculation of Landsat 7 with Google Earth Engine(search for gain and bias)
I need to calculate the Radiance of Landsat 7 in GEE
I read in Data Users Handbook under 5.6.5 how to do this. Here it says, these Values are accessible in the Metadata. Now I am searching the ...
3
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1answer
239 views
Finding the best image per year of Landsat image collection in Google Earth Engine
I am trying to create a series of images with the best image per year using Landsat 7 from 2000-2017 around the legal Amazon (using RBG bands 1-3). The code I have so far pulls up over 70,000 images ...
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29 views
The scale of Landsat 7 8-Day NDVI Composite
I have found Landsat 7 8-Day NDVI Composite dataset(LANDSAT/LE7_L1T_8DAY_NDVI) in Google Earth Engine,but I can't find the scale of it.So what is the scale of Landsat 7 8-Day NDVI Composite dataset?
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3answers
995 views
Atmospheric correction algorithm in Python or R for Landsat 7 ETM+
I am looking for an algorithm which can be tuned in python or R for atmospheric correction for Landsat 7 ETM.
Searching Google I have found only a few algorithms in ENVI or ERDAS which are not ...
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1answer
415 views
Comb-like missing data in landsat data images
I am using Python osgeo/gdal library to access Landsat 7 data (from different bands) as a numpy array. When looking at the data, I often see a very prominent comb-like banding effect. The image ...
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53 views
MODIS Landsat overlapping
I have two Lands Surface Temperature images, one from Landsat 7 and the other one is from MODIS, both for the same day. After projecting MODIS to UTM WGS84 the two images are slightly shifted, i.e. ...
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1answer
2k views
Landsat True color in QGIS [duplicate]
I have download the following Landsat 7 image
LE07_L1TP_231095_20011014_20170202_01_T1.
I want to open a true color RGB composition using bands 1, 2 and 3. For that, I import the Tiff files of the ...
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1answer
207 views
Calculating albedo values with landsat 7 ImageCollection/FeatureCollection error in Google Earth Engine?
I am facing a technical difficulty with Google Earth Engine
I am trying to retrieve the albedo value of the state of Idaho by using Landsat7 TOA reflectance imagery over the span of a year. ('2005-01-...
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2answers
2k views
inconsistent types in google earth engine with Export.image.toDrive()
I have computed NDVI from Landsat7 image, but when I want to export the result in google drive with Export.image.toDrive() it failed with the message error : Fail with an error : Error: Exported bands ...
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2answers
1k views
LS7 filling the gaps image with google earth engine
I would like to work with Landsat 7 images, but most of them have gaps... I would like to fill the Gaps by aggregate images bands by month. So I'm looking for a way to deal with this problem.
I have ...
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1answer
897 views
remove one image from imageCollection in google earth engine
I work with google earth engine on an imageCollection from landsat7. Some of those images are 'corrupted'. So I would like to remove one image from an image collection.
Actually I have :
var ...
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1answer
70 views
Radiometric Resolution of Landsat Sensors
Landsat data is in 8-bit (0-255) format. Would the difference between the sets of visible-NIR bands for Landsat 4,5, and 7 vary significantly?
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1answer
221 views
Landsat Collection 1 Level-1 or Landsat Collection 1 Higher Level?
I want to use NDWI and NDVI index in my study for a time-series analysis using all products available (Landsat 5,7 and 8).
Can I use the product Landsat Collection 1 Level 1 for my analysis or
...
3
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0answers
432 views
Pansharpen Landsat 7 RGB using gdal_pansharpen.py
Is it possible to pansharpen Landsat 7 RGB band combination (without NIR) to have approximately the same intensities as the original RGB image with gdal_pansharpen.py (weighted Brovey algorithm)?
What ...
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0answers
148 views
Correct gain for LST from Landsat 7?
I'm attempting to calculate land surface temperature (LST) from Landsat 7. Band 6, the thermal band for Landsat 7, comes in high gain and low gain settings. I'm calculating the temperature for Los ...
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1answer
93 views
Very low reflectance values landsat 7
I am getting very low reflectance values (mostly < 0.15) in all bands of multiple Landsat 7 scenes after having converted to TOA reflectance manually in ENVI. These values are not supposed to ...
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1answer
81 views
Different download options for the new Landsat ETM+ data
Can anyone give short info about the difference between:
LandsatLook Natural Color Image (11.2 MB)
LandsatLook Thermal Image (8.9 MB)
LandsatLook Quality Image (2.5 MB)
LandsatLook Images with ...
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1answer
129 views
Atmospheric correction of Landsat 7 slc-off images
I am interested in finding the change in land cover particularly forests.
I am working with slc-off images (no other sensor images available for my study). I have done the gap-filling in Erdas Imagine ...
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2answers
853 views
Error gap-filling Landsat 7 SLC-off with QGIS 2.18.3 on Windows 10
I am trying to gap-fill Landsat 7 SLC-off images with open-source software as explained in the comment below this post.
I'm new to QGIS and have almost no knowledge with Python (I'm a GIS novice ...
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0answers
47 views
EVI not producing values between 1 and -1 Landsat5/7 TM ETM+
I am trying to do EVI in ArcMap 10.3. I have done the atmospheric corrections for all the bands needed but cannot get the values between 1 and -1. I have used the formula EVI = G *(Band4 - Band3)/(...
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1answer
97 views
Training samples without ground truth data?
Does anybody have any idea how I could go about verifying my training classes properly in ArcGIS 10.3, WITHOUT ground-data. I am constructing a land cover map for 2011 in Cumbria and so far I have ...
6
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1answer
3k views
Calculating Landsat 7 NDVI images using QGIS
I have Landsat 7 images from 2011 to 2016 for my agricultural studies. First I corrected the slc-off problem of band 3 and band 4. Then I calculated the NDVI using both the raster calculator and the ...
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2answers
270 views
Where to download QA bands (cfmask bands) for surface reflectance Landsat7
I downloaded scenes from both Landsat 7 & 8 reflectance. However, QA bands are included in Landsat 8 but not 7. I selected "all data" when downloading. Anyone has a clue where the QA bands are for ...
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1answer
423 views
Landsat images with bad quality
I downloaded several Landsat images from some years between 1985 and 2014, all of them with good quality. Nevertheless the period from 2003 to 2013 is not worth it. I checked all images. Most of the ...
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5answers
2k views
Bulk Download App 'Insuficient Previledges'
Ordered Landsat 7 data from USGS and wants to download it using the Bulk Download application. However, i get this error while running the software.
I have JRE Installed properly.
Does someone knows ...
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3answers
88 views
substitute for landsat 7 for land classification?
I am doing a project where I need to do a land classification for a forest reserve in Honduras. The dates I need are 2005, 2010, and 2015. I'm good for 2015 with LS8, but I am having difficulty with ...
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0answers
213 views
Calculating vegetation indices on pansharpened landsat 7 images [closed]
I have a problem with calculating vegetation indices like EVI, GSAVI, SAVI on Landsat 7 images after I done a Brovey Transform, Modified Resolution Merge and HCS transformation in Erdas 2013.
My ...
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1answer
276 views
NDVI error in ERDAS
I have created a NDVI image from Landsat 7 data using ERDAS (veg_NDVI.gmd). This model was already in ERDAS 9.3. After creation the final output visually highlighting vegetative areas but the value ...
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1answer
2k views
From where can I get Landsat 7 and Landsat 8 metadata files?
I downloaded satellite images but mtl files were not in the zip. I searched a lot but i dint get from where to download mtl files. I need to convert radiance to temperature in both L7 and L8 images.
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0answers
304 views
From Landsat spectral radiance (W/m2*sr*µm) to Global horizontal irradiance (W/m2)? [closed]
We are working in a solar energy project to locate potential sites for solar panel farms. We are using the Landsat 7 panchromatic band to derive radiance with GRASS using i.landsat.toar (W/m2*sr*µm ...
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0answers
331 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.
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0answers
86 views
QGIS / Python differences in result [closed]
I am working on a script that automatically calculates something for me. To be sure, I checked the result of the calculation with QGIS. Here are the statistics:
STATISTICS PYTHON-CODE:
MAXIMUM = 0....
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1answer
275 views
can i comparing landsat 7 and landsat 8 thermal band?
can i comparing landsat 7 (band 6) and landsat 8 (band 10&11) thermal band? because landsat 8 only have 100m spatial resolution, so the output looks more general or blurr than landsat 7 thermal ...
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2answers
387 views
How to destripe the thermal band in SLC_off LandSat 7 ETM+ data?
I am working on a special study in one of my subject. My study would require me to extract land surface temperature each year for 2007-2014. Since LandSat 5 ceaseed to operate last 2011, my 2012-2014 ...
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0answers
116 views
About of low and high gain in Landsat for illuminate the scene
I don't know because after of make the calibration (only TOA) the false color composition (543 in Landsat 7) yet is different between 2 scenes. A scene looks opaque and another is clear (both are of ...
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1answer
900 views
Why does Landsat 8 panchromatic band NOT include the infrared? [duplicate]
The panchromatic band on Landsat 8 OLI sensor (band 8) covers a narrower portion of the spectrum than the corresponding band in Landsat 7 ETM+: 0.50 - 0.68 micrometers (L8 OLI) in contrast to 0.52 - 0....
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1answer
152 views
How to perform PCA with 2 different Landsat scenes
I want to perform PCA on 2 sheets of Landsat imagery with different acquisition time and coordinates. Prior to processing, should I combine both into one scene (mosaicking process)? If so, how is the ...
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1answer
442 views
create a vegetation mask using Landsat 7 [closed]
I'm working on a very large study area. The aim is to create a vegetation mask representing only pines. I'm using Landsat 7 images. Since the recordings were made in the winter it's pretty easy to ...
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1answer
2k views
Methods of cloud shadow detection for Landsat data?
Detecting clouds doesn't seem to be much of a problem, rather the challenge is in selecting cloud-shadow classes that don't also include coastal areas, agriculture, etc. For a project I'm working on, ...
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1answer
4k views
Landsat Observation Zenith and Azimuth Angles
I am doing a project with Landsat which needs to find out 2 Landsat images of the same area for different time, have both the same observation zenith and azimuth angles. But I can not find any ...
3
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1answer
5k views
Help with gap mask filling and Landsat 7 in ArcGIS 10
I have downloaded images from Landsat 7 ETM+ SLC-off with corresponding gap mask. Which is the best method for using it with ArcGIS 10?
I tried the mask and statistical method described in ArcGIS ...
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3answers
480 views
Destriping landsat 7 images?
I want to work with landsat 7 images for land cover and NDVI evaluation. There are strips in the landsat images, and I don't know how to remote them. I have learned methods for gapfill but I don't ...
2
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2answers
5k views
EVI and SAVI indices for Landsat 7 and Landsat 8
I'm trying to run the indices Savi and EVI at landsat 7 & 8. About SAVI I read this from ESRI and explains very good this index. About SAVI I have a question, I will choose buy my self the L ...
