Collecting and interpreting information about the environment and the surface of the earth from a distance, primarily by sensing radiation that is naturally emitted or reflected by the earth's surface or from the atmosphere, or by sensing signals transmitted from a device and reflected back to it.

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3
votes
1answer
49 views

Sample classification datasets?

I was looking for some publicly available ground data classification datasets, specifically, locations in e.g. latitude/longitude with a description of the land cover/land use, and a reference e.g. ...
3
votes
2answers
542 views

Are there Python packages for Landsat 8 processing?

While there are a number of python projects for MODIS acquisition and processing (pyModis and get_modis), I have yet to encounter a toolset for automating Landsat 8 processing in Python. There's ...
2
votes
1answer
52 views

Need information about the Envisat satellite

I am new to remote sensing and I want to know about sensor design of Envisat satellite. Can anybody help me or preferably direct me to some good references?
1
vote
1answer
255 views

How to do geometric correction of remote sensing data in R?

My challenge is to replace most of the remote sensing commercial tools with R code (I'm teaching assistant at the University and I would like to move to open source R code to show the added values to ...
2
votes
1answer
39 views

Question on how many ASTER per year ? per month?

How many scenes are there for ASTER per year ? From what I understand is that the temporal is every 16 days. So, some month it will have 2 and some months it will have one. Thanks.
4
votes
2answers
148 views

Zooming into landsat-8 produces pixellated view

I am working on a project were I am using LANDSAT 8 images for remote sensing. The issue that I have is that when I zoom into them the photo is pixellated. I can not see a thing. When I zoom out ...
14
votes
4answers
513 views

Is there a tool that performs automatic recognition of buildings?

I'm wondering if there is a tool, which takes a satellite map of a region, detects typical buildings and allows the user to review its result (check, whether the tool correctly identified the ...
1
vote
1answer
58 views

Finding Normal to a given point in ECEF coordinates

I have a point of reference called Ground Reference Point (GRP) given in Earth Centred Earth Fixed (ECEF) coordinates as given below: (1.4892e+6, 6.1102e+6, 1.0637e+6) (all distances in meters) I ...
5
votes
1answer
979 views

Atmospheric Corrections for Landsat 8 OLI Using Orfeo Toolbox

I am trying to correct some Landsat 8 OLI imagery using the Orfeo Toolbox Optical Calibration tool via QGIS. I've retrieved data from Aeronet as well as relative spectral response data for the OLI ...
1
vote
5answers
621 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 ...
0
votes
0answers
215 views

Top-of-atmosphere reflectance conversion with WorldView-2 images

I recently received a set of radiometrically-corrected dynamic range adjusted 8-byte WorldView-2 images. I want to convert to top-of-atmosphere reflectance and would like to use the FLAASH in ENVI 4.8 ...
8
votes
2answers
448 views

How do you explain that band width and relative spectral response of MODIS band do not match?

To define relative spectral response, I referred to EFFECT OF RELATIVE SPECTRAL RESPONSE ON MULTI-SPECTRAL MEASUREMENTS AND NDVI FROM DIFFERENT REMOTE SENSING SYSTEMS by David James Fleming, 2006. ...
0
votes
0answers
159 views

Atmospheric correction for RapideEye without atmospheric parameters

I'd like to perform an atmospheric correction of my RapidEye images but metadata do no include atmospheric parameters required to use the 6s algo implemented in the Orfeo ToolBox. Is there a solution ...
4
votes
2answers
260 views

What does MODIS data reflectance values (MOD13Q1) mean?

Several publications suggest filtering MODIS data (in my case MOD13Q1) prior to use. They recommended to filter out pixels having blue reflectance more than 10%, but what 10% here means? is it 10% of ...
2
votes
1answer
233 views

I need some more information on ASTER for time series analysis

See my previous post on ASTER I have a question about that I am not sure about. So, if I wanted to analyze 10 years or so, do I need to download each ASTER file for each year (e.g. 2003 ASTER, 2004 ...
-3
votes
2answers
131 views

How to derive soil water holding capacity from Landsat data [closed]

For estimation crop yields, I need some information such as Soil water holding capacity, potential evapotranspiration, crop types of the area, etc. For this purpose, I want to derive Soil Water ...
3
votes
2answers
598 views

Figuring out map scale when you know the spatial resolution of a Satellite Image?

I'm interested in figuring out how map scale and satellite pixel size (spatial resolution) are related. For example the TM or ETM+ has roughly 30m ground resolution, then, what could be the finest ...
1
vote
0answers
137 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 ...
3
votes
0answers
95 views

Counting animals using near infrared imagery from a drone [closed]

I am playing around with an idea of using a near infrared camera to fly transects to count animals on the ground. I have been involved in such work earlier, but on bigger mammals and observer based ...
2
votes
2answers
96 views

How to reduce the resolution of satellite imagery data for use in MATLAB

When I am using the 4-band multispectral data for NDVI calculation, after successful completion of runtime, it shows some warning message like "Loading 17%..." How should I rectify it? Should I do ...
8
votes
1answer
168 views

Most Effective Format to Manage Aerial Photography for Viewing Only

What is the most effective format to manage aerial photography for viewing in ArcGIS? I manage several datasets of Aerial Photography at a few different companies. I have backups of the original ...
3
votes
2answers
2k views

Landsat in ArcGIS

I need to learn how to download, import and compose Landsat 8 in ArcGIS for natural colors (preferably in a GEOTIFF format). I have tried on my own but it seems that I am doing something wrong... can ...
1
vote
0answers
244 views

Question related with NDVI value on water

There is a surreal thing on my NDVI images. NDVI values on lake is ranging from -0.04 to 0.7. (The lake surrounded by forest and has freshwater). Theoretically, negative value of NDVI is correspond to ...
1
vote
3answers
89 views

What are the white grids at 9.6953038715817,98.576672019046 in Google map?

A friend asked me to help interpret the white grids at 9.6953038715817,98.576672019046 in Goole map. In satellite image the grids are connected to rivers flowing into the Andaman sea. Most of the ...
2
votes
2answers
1k views

Open source solutions for Landsat-8 mosaicing and correction?

I am familiar with the major commercial remote sensing packages (ENVI, IDRISI ERDAS, etc), but I haven't previously had the opportunity to utilize open-source solutions. I have a several new ...
0
votes
1answer
124 views

Using Mosaicking Images in Erdas software

Do you know any dissertation which has written about Mosaic briefly? I did the Mosaic for my Landsat images but i want to explain and write about but i do not know how and what shall i write about it ...
2
votes
1answer
890 views

Open Source Alternatives to Erdas ATCOR

I have been using Erdas ATCOR for atmospheric correction of ASTER imagery. What opensource options exist for atmospheric correction of ASTER Level 1B products? I'm primarily interested in converting ...
2
votes
1answer
106 views

Advice on learning Remote Sensing software? [closed]

Can you please advice me on which Remote Sensing software ? Which one is popular ? Which one is the least ? Which one is the easy to learn curve ? Pros and Cons welcome ?
3
votes
1answer
1k views

processing MODIS hdf files with gdal

I'm trying to open an MODIS file (hdf format) with gdal in a python script under windows OS. I use the HDF4 driver, as read at http://www.gdal.org/frmt_hdf4.html. But when I run it I got this error ...
1
vote
2answers
145 views

Where to download ASTER scene boundaries?

I am looking for a shapefile of ASTER scene boundaries for the Kansas and Oklahoma region. The attached screenshot from GLOVIS is what I'm after, except I need polygon footprints with relevant ...
1
vote
1answer
83 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
0answers
91 views

How to convert MODIS (Vegetation Continuous Fields - MOD44B) to (.img and hdr) in ENVI

Please can anyone help me to convert MODIS (Vegetation Continuous Fields) to (.img and hdr) formats? In ENVI, anytime i try using the MODIS conversion toolkit, a dialog box appears telling me to ...
0
votes
0answers
44 views

patch analysis and spatial statistics for Grid data

I have TerraSAR data (raster data) for settlement, I must show the large density building, medium and low density in the map. Is this possible in the spatial analysis or patch analysis? I look ...
8
votes
4answers
280 views

Looking for a web service for change detection

I'm looking for service that provides me a change detection service based on a database of remotely sensed data. Has anybody happen to know such a service? The service I am looking for is a geoportal ...
2
votes
2answers
322 views

How can I perform an inside clip on a raster file based on another raster file?

I have a raster file that I would like to use to perform an inside clip on another raster file. I have tried using the extract by rectangle tool, but it gives me values ranging from 3.40282e+038 to ...
0
votes
1answer
168 views

Is Terrain and Topographic Correction the same for Landsat8?

Landsat 8 L1 products are "Terrain Corrected", that said it means that are they already "topographically corrected", like both words are synonyms or you need to apply correction techniques as well? ...
4
votes
1answer
298 views

Atmospheric Calibration for Landsat 7 ETM+ Gap Filling

This is for thesis work involving mapping of above-ground mangrove forest biomass using Landsat 7 ETM+ imagery. I am assessing correlations between biomass with vegetative indices, e.g. NDVI, and ...
3
votes
1answer
264 views

Questions regarding the processing of mosaic Landsat 8

Approximate Translation of Original Question: A question of theoretical and practical about the mosaic of satellite images. I have 3 different months of Landsat images, which need to accomplish the ...
6
votes
3answers
2k views

Best source for high-resolution satellite images free/low-cost?

I am doing a household survey in Kenya, and I need to ensure that my survey team visits every house within a given area. I've been going to google maps and right-clicking on roofs to get coordinates ...
2
votes
0answers
135 views

ENVISAT ASAR .N1 file is not being opened by ERDAS IMAGINE 2011

I am not able to open ENVISAT ASAR .N1 file in ERDAS IMAGINE 2011. The software has direct read option for files of this format. Whenever I try to open the file, software closes automatically giving ...
3
votes
0answers
85 views

Using Quickbird to discriminate vegetation response and spectral signatures - which season?

I have a study area in N. Florida loblolly pine plantation with 3 treatments (drought, fertilization, drought+fertilization, control) and 4 replicate plots. All plots will be in the same scene. These ...
4
votes
2answers
409 views

How do I deal with tiles in the Orfeo Toolbox segmentation?

I'm using the Orfeo Toolbox for segementation of large Very High Resolution Satellite images. It performs very well and i'm mostly very happy with it. But I still get some weird/bad results that I ...
4
votes
5answers
1k views

Which methods are most suited to classifying urban areas from Landsat imagery?

I am trying to use Landsat data to map urban extents over time. I need to perform a classification into built up / non built up areas. I am new to image classification. I have access to the following ...
1
vote
0answers
175 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
1answer
795 views

How to import HDF (L1G) files into ArcGIS for Desktop?

I have downloaded satellite imagery from GLCF website, it has downloaded with .L1G file extension, I am not able to open this file in ArcGIS as well in Erdas, so please let me know how to open this.
7
votes
1answer
197 views

How to decide possible areas for water retention using lidar

I have lidar imagery for a watershed and am trying to process it so that a landowner know if they can hold water on their property or where they can hole the water (this is the more important part). ...
1
vote
0answers
154 views

Averaging satellite data with missing values (using Python)

I am using sea surface temperature, chlorophyll, and other data parameters as covariants in a model, and I would like to average them over a particular time period. I am currently doing this using a ...
2
votes
0answers
337 views

Principal Component Analysis in QGIS

How do I go about to perform a band ratio and Principal Component analysis in QGIS? I need to derive principal components from ratios of landsat TM bands .
7
votes
1answer
242 views

How to produce a vegetation stress map utilizing the spectral blue shift of the red edge?

I am interested in mapping vegetation stress utilizing the blue shift to the red edge phenomenon in remote sensing. The figure below shows the expected change in reflectance of green leaves under ...
3
votes
2answers
316 views

Tasseled Cap Transformation Rapid Eye

I want to do tasseled cap transformation on rapid eye data. the main question would be about the parameters which are used. Somebody has a suggestion?