Questions tagged [landsat-7]
The 7th satellite in the Landsat program.
60
questions
1
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2answers
24 views
Landsat7 Scan Line Correction in GEE
I am working on a time series with Landsat 7 and I have issues with the scan line correction. I already saw the question LS7 filling the gaps image with google earth engine and tried to adopt the ...
0
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1answer
11 views
Filter Landsat 7 surface reflectance image collection base on cloud cover and tide level over a region of interest
I have a similar question with Filter Landsat images base on cloud cover over a region of interest. I'm trying to filter the Landsat 7 Surface Reflectance image collection over a tiny region of ...
2
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1answer
44 views
How to print chart for NDWI
Trying to compute chart for NDWI
var dataset = ee.ImageCollection('LANDSAT/LE07/C01/T1_8DAY_NDWI')
.filterDate('1999-01-01', '2002-12-31')
.filterBounds(...
1
vote
1answer
30 views
Subtract two pixels-only- layers using rectangle extent
I have coe in GEE that calcultes the NDVI in a given polygon, from 2000 (based on landsat 7) and 2019 (landsat 8) ,create for each one a layer with pixels that their NDVI value is higher than 0.3 and ...
1
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0answers
33 views
Export classified Landsat 7 image - Google Earth Engine
I am trying to export images of MODIS landcover classifications and classified Landsat 7 images.
However, my codes only result in black images rather than what I see if I add the layers to the Map.
...
0
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1answer
26 views
Seeing heights in Landsat 8
I have downloaded some DEM from Landsat 8 from usgs website.
when I opened the compressed file I saw some Tiff files and two text files.
I opened the txt file using ArcGIS 10.7 and it contains many ...
2
votes
1answer
125 views
Merging raw data from Landsat 5, Landsat 7 and Landsat 8
This question concerns the merging of the following Google Earth Engine collections:
USGS Landsat 5 TM Collection 1 Tier 1 Raw Scenes (LANDSAT/LT05/C01/T1)
USGS Landsat 7 Collection 1 Tier 1 Raw ...
1
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0answers
30 views
Layer not generating correctly when running Raster Fillnodata in QGIS [closed]
Using QGIS 3.4.5 I am attempting to fill a landsat 7 band raster layer as the image contains diagonal lines because of the scan line corrector issue. I'm using the raster analysis no fill data tool ...
3
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0answers
49 views
Problem with QGIS GDAL Fill Nodata
I have been using the 'GDAL Fill Nodata' function in QGIS in order to rectify downloaded Landsat 7 images, having created a relevant mask. Whilst said function has been successful in resolving bands 1 ...
2
votes
1answer
183 views
Getting Landsat 7 images scanline errors in ArcGIS Desktop?
I have used "Fix Landsat 7 Scanline Errors" tool to remove the stripes from the raster. Though the black scan lines are removed but the raster gets scratches. See
screen shot below.
How can I ...
0
votes
2answers
133 views
Exporting Landsat 7 Surface Reflectance through Google Earth Engine
I'm trying to export Surface Reflectance data from Landsat 7 through Google Earth Engine. However, the dimensions don't seem to match up: previously with NVDI data, I printed the image collection size ...
2
votes
1answer
50 views
Fusing Collection 1 Landsat 7 and 8 Surface Reflectance NDVI
I'm fusing L7 & L8 surface reflectance into an NDVI time-series. I'm using the method described in Roy et al. 2016 to convert L7 NDVI to L8 NDVI using a simple regression equation found in table 3:...
1
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0answers
68 views
Performing supervised classification with Landsat 7 in Google Earth Engine
I am trying to perform landcover classification of Shanghai using JavaScript in Google Earth Engine. I am a complete beginner at this and I have been going through many tutorials trying to figure ...
0
votes
0answers
28 views
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 ...
0
votes
2answers
42 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 ...
0
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0answers
30 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,...
3
votes
1answer
453 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:/...
0
votes
1answer
346 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 ...
0
votes
1answer
58 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
votes
1answer
420 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 ...
7
votes
3answers
2k 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 ...
2
votes
1answer
449 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 ...
0
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0answers
64 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. ...
1
vote
1answer
3k 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 ...
1
vote
1answer
339 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-...
4
votes
3answers
4k 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 ...
4
votes
2answers
2k 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 ...
2
votes
1answer
2k 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 ...
1
vote
1answer
87 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?
2
votes
1answer
314 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
...
2
votes
0answers
576 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 ...
1
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0answers
201 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 ...
2
votes
1answer
98 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 ...
2
votes
1answer
130 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 ...
1
vote
1answer
156 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 ...
3
votes
2answers
1k 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 ...
1
vote
0answers
51 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)/(...
1
vote
1answer
107 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
votes
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 ...
1
vote
2answers
315 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 ...
4
votes
1answer
511 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 ...
1
vote
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 ...
2
votes
3answers
121 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 ...
1
vote
0answers
235 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 ...
1
vote
1answer
301 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 ...
2
votes
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.
3
votes
0answers
336 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 ...
0
votes
0answers
393 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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0answers
91 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....
3
votes
1answer
299 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 ...
