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

learn more… | top users | synonyms

2
votes
0answers
50 views

Possible to use same signature file to classify images from different years?

I have Landsat images for the same area over 20 years (one photo per year in same season). I would like to detect changes occured in forested area like clear-cut and bark beetle outbreak over time. I ...
2
votes
0answers
78 views

Plotting Bare Soil Line on landsat data in RStudio?

I am using RStudio with landsat package for computing and plotting the Bare Soil Line (BSL) on landsat tif image running on my HP Pavilion i7 laptop. The codes for running the BSL() function is as ...
2
votes
0answers
368 views

Problem with Create Fishnet on a Landsat footprint

I have a Landsat footprint polygon shapefile that I simply want to create a 6 x 6 fishnet on. I thought this would be simple, but every time I run the tool I get a fishnet output that extends longer ...
1
vote
4answers
123 views

Looking for simple software to compare two Landsat Images

At uni I used ERDAS imagine to view two rasters at the same time and it had various viewers for comparing them. I'm looking for something that has a slider so that I can see the differences between ...
1
vote
2answers
68 views

Landsat images with more than 3 colored bands

I’m looking for a website where I can find Landsat images (or similar to it) with more than just 3 color bands. http://glovis.usgs.gov/ only gives me 3 bands. Is there a way to obtain more band? ...
1
vote
2answers
604 views

Extract the spectral signature of Landsat 7 and Landsat 8

I have some polygons and I want to extract the spectral signature of the adjacent satellite images. The satellite images that i use are the NDVI from Landsat 7 and 8 and I want to compare the spectral ...
1
vote
1answer
534 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 ...
1
vote
5answers
947 views

Fix Landsat 7 SLC-off in ENVI?

I have a couple of Landsat 7 images and they all have striping as a result of the SLC failure. Does anyone have any suggestions as to how to destripe the image using ENVI? I plan to use these images ...
1
vote
1answer
61 views

Automatically georectify raw Landsat scenes

I am working with 20 raw Landsat images downloaded from GloVis, in WGS 84 (EPSG 32634) coordinate system. I need to geometrically correct them to S_JTSK (EPSG 5514). Usually, georectification is done ...
1
vote
1answer
67 views

Convert Landsat image to polygon

I downloaded Landsat image and used composite band toolbox. Now, I produced color map but I need to create boundaries across urban area. Is there any way to create polygons among that area and how?
1
vote
2answers
46 views

How to calculate regrowth area?

Thanks to Best Landsat-5 TM band combination for detecting fire scars I am able to calculate burnt area in an absolute way (Normalized Burn Ratio). Does a ratio or delta operation exist to calculate ...
1
vote
2answers
176 views

Calculate actual Landsat image corner coordinates to derive azimuth (heading)

This is the continuation of an unsolved problem I had (see this thread if you like). I have a Landsat image and I would like to estimate the satellite azimuth for my location. As the satellite follows ...
1
vote
2answers
135 views

Matching Landsat 8 with previous Landsat images

I am working with Landsat 8 in ENVI. My image's dimensions are 8921 x 13131. I need to apply a forest mask to this image with dimensions of 8805 x 12321. I try to resize an image, but it doesn't work. ...
1
vote
2answers
115 views

Classification, change detection and NDVI using landsat 2 (MSS), landsat 5 (TM) and Landsat 7 (ETM)

I have 3 Landsat images for the same area. One in 1972 (landsat 2 mss), one in 1996 (landsat 5 TM) and one in 2010 (landsat 7 ETM). I would like to detect changes in land cover and create diachronic ...
1
vote
1answer
47 views

Apply regression equation to Landsat ETM+ image

I have sample points in an Excel file with XY coordinates and canopy density. I also have a Landsat ETM+ image. All points are collected from the same area as in the image. I exported all sample ...
1
vote
2answers
152 views

Programmatically Downloading Landsat Images

There was a very similar question to this one here , but it specified Landsat 8 images; I'd just like to be able to download ANY landsat images, given latitude and longitudes as inputs. Just wanted ...
1
vote
1answer
190 views

Is Landsat 4-5-7 L1G geometric corrected?

Im using Landsat L1G for our project and need L1G to be geometric corrected for later use. One thing I know for sure that L1G need to be employed a Digital Elevation Model (DEM) for topographic ...
1
vote
1answer
462 views

Landsat Gap Fill [duplicate]

I am looking for a Landsat gap fill method for quantitative data analysis. The best I have found is a reference to a method called "single file gap fill triangulation" using in ENVI, but am unsure how ...
1
vote
1answer
703 views

Using Landsat 8 for quantitative analysis - what DNs does GRASS require?

Hoping someone can short circuit a lot of exploration Landsat 8 values are stored as unint16 since the sensors work on a range 0 to 4096 whereas the L7+TM was 8 bit and had a digital number range 0 ...
1
vote
1answer
100 views

GRASS 6.4.3 Landsat processing

what are the pre-processing steps required for landsat etm+ with GRASS 6.4.3 prior to land cover change detection? The product used is L1T.
1
vote
1answer
89 views

Satellite imagery options for small/medium sized countries?

I need to create land cover classifications for a couple countries in central/eastern Asia. The largest country is 50,000km^2 and the smallest is 10,000km^2. What are my options for recent imagery? At ...
1
vote
1answer
113 views

How to convert a multi-band landsat RGB to a kml file using MAPTILER

I was able to use maptiler for converting a single raster (ortofoto geotiff obtained with UAV) into a kml file. Now I want to convert a RGB landsat into kml for visualisation in Google Earth. It is ...
1
vote
1answer
162 views

trouble with i.landsat.toar failing to identify satellite

I am trying to use the i.landsat.toar tool on L7 bands. I have tried to use both the MTL and MTLold, but no matter what I try, it returns "Failed to identify satellite." What am I doing wrong?
1
vote
0answers
14 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 ...
1
vote
0answers
24 views

Spectral Signature Extraction using landsat 7 and MODIS

I am working on differentiating cocoa plants from other vegetation types using 4 epoch bwt 1980-2010. I need to extract the spectral signature for cocoa plants and other known features. I plan using ...
1
vote
0answers
51 views

Resample Landsat 8 to 60m Resolution

I have two Landsat images for the same study area. One of them in 1975 (Landsat 2 MSS with 60m resolution) and the other in 2014 (Landsat8 OLI with 30m resolution). I want to do change detection ...
1
vote
1answer
51 views

Classification, Change detection and NDVI Using (landsat2 MSS), (landsat5 TM), (Landsat7 ETM+) and (Landsat8 OLI)

I have 5 Landsat images for the same study area. One of them in 1975 (Landsat 2 MSS), two in 1985 and 1995 (Landsat 5 TM) and one in 2005 (Landsat 7 ETM+) and the last one in 2014 (Landsat8 OLI). I ...
1
vote
0answers
29 views

Retrieving Aerosol Optical Depth (AOT) from Landsat multispectral data

I need to retrieve Aerosol Optical Depth from Landsat multispectral datasets. Has anyone successfully tried something like that before?
1
vote
0answers
102 views

QGIS 2.4.0-Chugiak: How to produce raster colour map

By carefully deriving the NDVI values from Landsat Band 3 and Band 4 after doing atmospheric correction by applying DOS1 method in semi-automatic classification Plugin QGIS, I was to calculate the ...
1
vote
1answer
129 views

Cloud/Shadow Masking: How to shift a cloud mask in Erdas/ArcMap/Py Script

I have the task to mask out cloud cover in approximately 20 landsat 8 scenes. Creating the cloud mask for the "white part" is easy, but I need help in addressing the clouds shadow. General ...
1
vote
1answer
61 views

Canopy density & NDVI Regression using ArcGIS for Desktop?

I have a Landsat ETM+ image, I also have 200 sample points with coordinates,canopy density, different band values and NDVI values. If I build OLS model I only got sample points regressed. How can I ...
1
vote
1answer
37 views

Determine changes in land cover of isolated features over time?

I have a a study area of 2 Landsat scenes from 2013 which were classified for a specific natural community, and these areas have been isolated and extracted and digitized into vectors so that they can ...
1
vote
0answers
240 views

Use a Python script to stack layers from multiple directories and produce multiple outputs in ERDAS

I am using ERDAS Imagine 2013 and am trying to create a Python script that takes lists created in another script containing the path to each scene's raw data folder and base image ID's (for example ...
1
vote
1answer
66 views

Lat/lon of pixel inside Landsat scene

How do I find the lat/lon of each pixel inside a landsat scene. Either the equations for converting i,j to lat/lon or just a bunch of files, one for each scene. Background: I have downloaded a bunch ...
1
vote
0answers
55 views

How to select MODIS pixels with 80% homogeneous landcover from landsat classification?

I have a complex landcover classification for a landsat scene at 30m spatial resolution. Includes about 600 land cover classes. There is a fair amount of clumping per group. I have a MODIS EVI 16 day ...
1
vote
0answers
57 views

How to perform image classification with SemiAutomaticClassificationPlugin and BIP files?

I have multiband satellite images BIP format, Landsat TM/ETM containing 7/8 bands respectively along with a separate header file, some of them corrected by nearest neighbour classifier. I'm working ...
1
vote
1answer
251 views

Floating point calculations in QGIS

How do I manage floating point calculations in QGIS? I have carried out 3 consecutive calculations on landsat bands. I end up with 32 bit floating point rasters on which I can't carry out a 4th ...
1
vote
1answer
145 views

How to get a the minimum value of a raster layer in qgis with python? [closed]

I'm very new user of QGis and I work with landsat 5 images. In this framework, I would like to make an atmospheric correction subtracting the minimum value present in each band (1 to 4). My ...
1
vote
0answers
166 views

Change Detection ArcGIS with multiple dates

I'll explain my aim first: I am trying to create a single raster to represent vegetation resilience, I am doing this via change detection. So far I have created 5 Change detection images, where 2000 ...
1
vote
0answers
72 views

Is the 2010 Landsat world map (GLS 2010) available in a GoogleMaps browser?

Is the 2010 Landsat world map, also known as GLS 2010, available to view anywhere on the internet in a GoogleMaps browser? I need to find it so that it can be added as a layer to a GoogleMaps ...
1
vote
0answers
213 views

How to mask clouds in ER Mapper?

I am using ER Mapper. But, I'm still confused how to detect and mask the clouds. I want to reduce or eliminate the cloud to perform supervised and unsupervised classification.
1
vote
1answer
235 views

Automated Importing of Landsat with new USGS MLT metadata file

Has anyone had any luck importing Landsat with the updated MLT files? Besides ENVI 5 SP1 I see no software that can create images from these new files. I can do a manual layer stack but then the band ...
0
votes
1answer
1k views

Can ArcGIS Desktop 10 stack layers?

I have 7 bands of Landsat and I would like to combine all layers into one layer. Can ArcMap do as Erdas software?
0
votes
1answer
80 views

Extract elevation data from Landsat / MODIS imagery?

Just curious, have anyone tried to extract elevation data from LANDSAT or MODIS imagery? So far, I came across one journal by Toutin who did so using adjacent LANDSAT 7 imageries. Results seem pretty ...
0
votes
1answer
79 views

Georeferencing an aerial image based on satellite imagery

As part of a bigger project I need to georeference an aerial image based on a landsat image downloaded form usgs. I use qgis. can I somehow place the layers on top of each other and mark certain ...
0
votes
1answer
147 views

Using gdal merge correctly?

Currently trying to use gdal_merge within qgis to stack three raster bands, the command it's showing is like this: gdal_merge.bat -separate -of GTiff -o out.tif "LC80190302014126LGN00_B4.TIF" ...
0
votes
1answer
87 views

Which Landsat version is appropriate to imply a supervised classification with GRASS GIS?

I need to imply a supervised classification with GRASS GIS to find build-up areas. I want to avoid Landsat 7 images due to SLC problem. Can I use images of Landsat 8 or it's better to use images ...
0
votes
1answer
150 views

How to export a map (satellite image, 3 bands) to Tiff without losing the resolution in Qgis.

I manually improve the colour contrast of landsat images. The printing in pdf afterwards is OK, as it maintains the resolution due to the high dpi. Now I am interested to obtain a kmz/kml file of the ...
0
votes
1answer
26 views

Which DOS method use to convert at-sensor radiance to at-surface values in GRASS (landsat data, i.landsat.toar modul)?

I am trying to calculate surface reflectance values from raw Landsat DN data downloaded from GLOVIS. I have imported Landsat data in GRASS 6 with header by i.landsat.import and reprojected the scene ...
0
votes
0answers
74 views

Masking clouds with Fmask

I have been trying to mask clouds with the quality control band with landsat 8 imagery. The problem I continue to run into is that the quality control bands mistake tops of buildings and concrete as ...