Questions tagged [landsat-7]
The 7th satellite in the Landsat program.
66
questions
3
votes
1answer
47 views
EVI or NDVI collection image download
Landsat 8 Collection 1 Tier 1 8-Day EVI Composite.
I continued with the starting codes given by Google Earth Engine. I tried to solve my work by adding code to the rest of these codes. However, it ...
1
vote
1answer
43 views
Problem dry fields- urban areas on supervised classification in QGIS, Landsat 7
I am trying to make a supervised classification on a Landsat 7 image using the QGIS 3.16.1 version. I am using the SCP plugin to do then classification. I am doing the classification using the RGB ...
0
votes
0answers
26 views
Projection issue
The Landsat data having a subset area when I try to open in QGIS it is locating on top of sea. See in picture
1
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0answers
27 views
Missing Data in Landsat 7 and 8 (NOT due to Scan line Error)
I have created numerous annual median composites of Landsat 7 and 8 data using Earth Engine Python API. For some reason, there are some parts of the subset showing as no data (Figure1), despite there ...
0
votes
0answers
67 views
How to find the Minimum value for the Dark Object Subtraction in ERDAS?
I have a Landsat 7 Image with MTL file showing minimum value as 1 and the maximum value is 255. The water pixels show a range of 63 to 74. In the image, there are a few pixels that have a value of 1, ...
0
votes
1answer
69 views
No images in the timelapse video using google earth engine and landsat-7 image collections
I am trying to make a timelapse video of images captured by USGS Landsat 7 Collection 1 Tier 1 and Real-Time data Raw Scenes using google earth engine. Somehow all the video results are just white ...
1
vote
1answer
159 views
Applying Landsat scan line correction on a time series
I am currently trying to adapt the scan line correction (SLC) for Landsat 7 on my timeseries.
My code is based on the stack exchange question how to do the SLC, but I am not managing to apply it as a ...
0
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0answers
177 views
Calculating the land surface temperature in Google Earth Engine
Just wondering if anyone had any suggestions on how to calculate Land surface temperature (LST) across Landsat missions 5,6,7 within Google Earth Engine
I have found a few scripts adopting different ...
3
votes
2answers
625 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 ...
2
votes
1answer
102 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
74 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
vote
0answers
170 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
votes
1answer
32 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 ...
3
votes
1answer
558 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
vote
0answers
40 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
votes
0answers
67 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
994 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
237 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
85 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
vote
0answers
164 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 ...
1
vote
2answers
85 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
votes
0answers
31 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,...
4
votes
1answer
800 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:/...
1
vote
2answers
725 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
86 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
694 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
460 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
votes
0answers
70 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. ...
2
votes
1answer
4k 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
457 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
5k 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 ...
8
votes
2answers
4k 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
115 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
329 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
847 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
241 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
99 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
181 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
168 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
52 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
108 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
365 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
572 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
3k 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
140 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
245 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 ...
