Questions tagged [landsat-7]
The 7th satellite in the Landsat program.
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24 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, ...
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1answer
35 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 ...
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1answer
51 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 ...
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0answers
89 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 ...
2
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2answers
209 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 ...
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0answers
86 views
Extracting monthly NDVI data using Google Earth Engine
I am using the following code to extract yearly NDVI. Is it possible to extract the monthly data?
// Map a function to select data within the year and apply mean reducer
var byYear = ee....
2
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1answer
67 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(...
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1answer
46 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 ...
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0answers
87 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.
...
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1answer
29 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
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1answer
292 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 ...
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0answers
32 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 ...
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0answers
61 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
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1answer
429 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 ...
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2answers
181 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
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1answer
69 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:...
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0answers
103 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 ...
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2answers
48 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
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,...
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1answer
612 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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2answers
486 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
69 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
547 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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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
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1answer
454 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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68 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
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 ...
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1answer
385 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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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 ...
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2answers
3k 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
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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 ...
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1answer
92 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
320 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
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0answers
693 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
218 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
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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
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1answer
149 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
162 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
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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 ...
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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)/(...
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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
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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
342 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
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1answer
538 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 ...
2
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3answers
130 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
243 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
314 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
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1answer
3k 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
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0answers
341 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 ...
