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

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4
votes
1answer
62 views

Misalignment of a lot of landsat images

I am new to Landsat images processing, and I'm trying to create land cover change maps over an area covering around 15 landsat scenes. I downloaded all scenes available, unfortunately some layers don'...
5
votes
0answers
651 views

RGB satellite image in Python with Basemap

Can anyone recommend a workflow or python library that will let me work with RGB images and BaseMap (or something equivalent - could be CartoPy). I have Landsat 8 images, and can load one in python ...
4
votes
0answers
39 views

Ice type differentiation using satellite data

I would like to classify glacial area by categories of snow (if there is) and ice, but what's most important: between old ice and fresh ice. They have different properties that are possible to ...
3
votes
0answers
15 views

Snapping vectors to vertices for ROI delineation?

I am trying to manually extract a set of ROIs in ENVI 5.0. However, I can't seem to successfully line up the vector to be flush with the boundary of the pixels, which means I don't have fine-tune ...
3
votes
0answers
42 views

How to use a conditional logic on Impervious Mapping

I am trying to use a logic ( rule -based classification ) to extract built-up area, similar to as suggested by Xu (2007).He uses, three spectral indices, SAVI( Soil Adjusted Vegetation Index), NDBI ( ...
3
votes
0answers
74 views

How to remove black pixels in Landsat image

Does anyone know how I can remove these black pixels around the edge of this Landsat image? They appeared when I layer-stacked the bands in ERDAS IMAGINE - they were not there in the separate band ...
3
votes
0answers
87 views

How to analyze the signatures for a Landsat clasification with Sextante in Quantum Gis

I’m defining my training data for a Landsat classification. I´m digitalizing the polygons with the field data in QGis and I want to analyze the signatures of the Landsat images to avoid errors. In ...
2
votes
0answers
37 views

Negative reflectance values after topographic corrections (cosine correction and modified Minnaert correction)

I am trying to manually correct the surface reflectance values of some Landsat 7 and 8 images. I'm using Minnaert modified method, which uses the cosine correction as one of its inputs (see below the ...
2
votes
0answers
34 views

How do I report area statistics for land cover classes at equal sections along a river?

I have a river outlined: Using QGIS, the Semi-automatic Classification plugin and Landsat 8 images I classified the habitats (blue=water, yellow=sand/rock...,green=vegetation/algae) inside the river ...
2
votes
0answers
101 views

Calculating Aerosol optical thickness from Landsat 7

EDIT I have added question down I am reading one paper and I found method to retrive AOT from landsat 7 image This should be simplifield equation, because they assumed observation zenit as 0. Than ...
2
votes
0answers
54 views

Important to perform atmospheric correction when attempting to identify coral reefs?

I want to identify coral reefs using multi-temporal Landsat data and Lyzenga's Transformation method. In relation to pre-processing the image, should atmospheric correction be done or not? If not, ...
2
votes
0answers
372 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 ...
2
votes
0answers
171 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
718 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
0answers
52 views

Layer Stack 6 Landsat8 bands

I have 6 images from Landsat 8 (Green,Red,NIR,SWIR1,SWIR2,NDVI). When I want to layerstack them with "Merge" I always get a result tif which is just black and white, however I can see that all 6 bands ...
1
vote
0answers
23 views

Positioning Landsat 8 data in Google Earth

I have some (combined) Landsat 8 TIF files that I want to overlay in Google Earth Pro. I manually set the 4 corner lat/lon coordinates (Properties->Location) to the 8 CORNER_UL_LAT_PRODUCT, ...
1
vote
0answers
23 views

Clip Layer Stack

I layer stacked the Landsat 8 Bands (1-7) in QGIS and made a polygon shapefile. Every time I try to clip my layerstack with the Mask layer I just get a completely black output raster. I want to use ...
1
vote
0answers
43 views

Grass i.landsat.acca says image is cloud free but it is not

I'm working on an area in Amazonia with high cloud persistance which makes global data on land cover quite useless at small scales, so I wanted to learn to process my own Landsat images, with GRASS ...
1
vote
0answers
898 views

Reading, modifying and writing a geotiff with GDAL in python

I'm trying the learn the ropes of Remote Sensing image processing using Python GDAL bindings and numpy. As a first attempt, I'm reading a Landsat8 geotiff file, do a simple manipulation and write the ...
1
vote
0answers
84 views

Landsat Data to Map Slums in India

I am working on a project to answer the following geographic question: How much have slum areas increased in Mumbai, India, since the 1970's (or earliest data). I have downloaded LandSat imagery and ...
1
vote
0answers
64 views

How do I use Multispec for Landsat data?

It seems that I only can use the Clustering if I want to cluster only one band data.. If I open up more than 1 band (in one image), the cluster toolbar is disabled? optional: Is there any free ...
1
vote
0answers
146 views

Georeferencing multispectral data using ArcGIS Desktop?

I often have to georeference Landsat data image to map (often raw data without geometric corrections). The way I am doing this is to open up one channel and set my GCPs and save them into a txt file. ...
1
vote
0answers
37 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
211 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
291 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
0answers
680 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
0answers
116 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
80 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
0answers
265 views

Trouble with opening/using i.atcorr in GRASS

I'm relatively new to GRASS. I'm running version 6.4.3 on a Windows 7 machine. I'm trying to process Landsat 5 imagery from multiple states, so I was hoping to approximately follow the workflow here: ...
1
vote
0answers
218 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
123 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
347 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.
0
votes
0answers
13 views

Single channel Change Detection

I want to write script for Google Earth Engine, which will create bitwise mask of changes. Earlier I made through ScanEx Image Processor and this function is called "Single channel change detection". ...
0
votes
0answers
19 views

Problem with i.landsat.acca on GRASS

I have a problem with my Landsat Tree Cover Continuous Field. The images are fully of clouds and shadows, so unreadable. The problem is the following: when I try to use i.landsat.acca to remove ...
0
votes
0answers
55 views

Right Orfeo Toolbox Segmentation input

I made this tutorial. I used Landsat 8 bands (1-7), which I atmospheric corrected with DOS and converted to 8bit. After that I layer stacked the pre processed band (1-7), clipped a little part with a ...
0
votes
0answers
41 views

Download USGS satellite images of a city only

I need to download the satellite images of a city for land change detection. Specifically I need to show urbanization trends and predict the future expansion. Now I can't seem to download just the ...
0
votes
0answers
33 views

Is there an automated way of downloading the natural color .TIF images for Landsat 8?

I know that .jpg natural color images can be downloaded from AWS. But, .jpg doesn't contain the world metadata along with it.
0
votes
0answers
16 views

Which sensor can provide PAR values for GPP/NPP estimation and how to retrieve that

I have to estimate gross as well as net primary productivity of a needle leaf temperate forest ecosystem using a Landsat image. Which sensor can I use to retrieve PAR values since I don't have any ...
0
votes
0answers
14 views

glcm texture in R (mean_Envi)

I am running a Image texture measures from grey-level co-occurrence matrices (GLCM) using the glcm package in R and I would like to know what is the difference between mean' and 'mean_ENVI' / '...
0
votes
0answers
23 views

GRASS: strange classification output and reject map from “i.maxlik”

I am trying to perform a supervised classification with "i.maxlik". I have three bands: 1) elevation (a dem); 2) reflectance (derived from Landsat ETM+ band4); 3) cumulative solar radiation (derived ...
0
votes
0answers
54 views

applying Image regression in landsat image

I have two different date of Landsat image.I want to do change detection using image regression method.Is it possible to do image regression in Erdas Imagine or ARCGIS? How can I develop a model for ...
0
votes
0answers
47 views

Achieving consistent RGB Composite Settings using ArcPy?

Does anyone know if there is an arcpy tool so that when I bring in raster imagery (Specifically Landsat) into ArcMap it will automatically adjust the settings of the RGB composite? I know under ...
0
votes
0answers
50 views

Landsat images from same path/row have different shapes

I'm starting to play with satellite imagery. In particular, I am using images of the Landsat 7 and Python. I open two TIF images of the same place but at different times to the numpy arrays and they ...
0
votes
0answers
53 views

Geometric correction using topographic maps?

I am researching LULC change detection using Landsat 7 etm + image in 2000 and Landsat 8 image in 2014. Both are L1T images. Do I need to do geometric correction using topographic map for my study ...
0
votes
0answers
79 views

DEM input problem using ARCSI Landsat 8 batch processing

I'm trying to use ARCSI in Linux to process a batch of Landsat 8 images. I'm using the arcsibuildcmdslist.py to build the arcsi.py final command. I'm having problems in the input DEM (http://...
0
votes
0answers
72 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.
0
votes
0answers
119 views

setting null values to 0 Landsat 8 Grass 7.1

I am working with Landsat8 images and need to run the albedo function in Grass 7.1.svn. In order to do this, I need to set the null values to 0 to eliminate the black border around the images. This ...
0
votes
0answers
843 views

QGIS 2.4; How to convert float raster to integer raster

I am using Normalize difference vegetation index (NDVI) derived from the landsat satellite band 3 and band 4 that have float values ranges from -1.0 to 1.0. I want to see the attribute table that is ...
0
votes
0answers
86 views

Script to stack multiple landsat bands in different folders

I wanted to find out if there is a possible script I could use to stack landsat bands into a single image, and then apply that stack command to multiple folders (I have about 100 landsat scenes that ...
0
votes
0answers
251 views

GRASS i.atcorr outputs unusual values

I have problems using the atmospheric correction module i.atcorr in GRASS 6.4.3RC3. I try to correct two Landsat ETM+ scenes, but the output for bands 4 and 7 has values that seem to be incorrect. ...