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.
19
votes
5answers
1k views
OpenSource Remote Sensing Tools for Classifying Roofs
with envi image processing and classification tools, you can get roofs from images with some spectral value and then you can convert it some vector data for your app.
in python with OpenCV which have ...
18
votes
6answers
569 views
Machine Learning Algorithms for Land Classification
I am interested in learning what software exists for land classification using machine learning algorithms (e.g. k-NN, Random Forest, decision trees, etc.) I am aware of the randomForest package in R ...
18
votes
6answers
1k views
Is GPS more accurate on specific hours of the day?
I have heard that the GPS system is more accurate, and less accurate on some specific hours on the day.
If this is true, how can I get the information on when GPS is more or less accurate at my ...
18
votes
9answers
2k views
Which Tools do you use for Classification of Remote Sensing Data?
Which tool do you prefer to use for classification of remote sensing data, e.g. classifying land use, and why?
Which other tools have you tried, and why did you decide against them?
15
votes
3answers
1k views
Which remote sensing satellite is best used for vegetation extent mapping
I'm currently writing an assignment for my remote sensing class and while I think I have correct answer was wondering what people who do this stuff for a living think.
The question is: which satilite ...
15
votes
6answers
414 views
What are people using LANDSAT data for?
Obviously it's potentially a very powerful tool, but I'm curious as to what practical applications people are using it for?
Admittedly, this is a very broad question... The reason I ask is because ...
14
votes
3answers
512 views
Ecological geospatial conundrum
I am looking for a different, more elegant solution to a spatial statistics problem. Raw data consists of an x-y coordinate for each individual tree (i.e. converted to a point .shp file). Although ...
13
votes
6answers
327 views
What is the best/easiest way to obtain temporal Landsat imagery?
It's been awhile since I've dealt with optical imagery. I need to perform a land cover classification at mid-latitudes using several LANDSAT scenes. I've noticed that some online tools are still ...
12
votes
8answers
774 views
Is there a smartphone app for mobile asset logging?
I'm after a recommendation for a smartphone app (iPhone or Android) to log asset information for litter bins. I need the following features
GPS
geotagged photos
Form with drop down menus for user ...
12
votes
3answers
360 views
Alternative vegetation indices
I have been using NDVIs with limited success to identify trees in the central Great Plains region of the USA. The problem I have been encountering is that reflectance from farm fields/pastures have ...
11
votes
2answers
1k views
Is there a way to automate the preprocessing of LANDSAT data?
I'm currently enrolled in a remotesensing course, using LANDSAT data.
Part of my course is about standardizing the scenes based on radiance values. I assume that because this is such a tedious task, ...
11
votes
2answers
341 views
How sensitive is Landsat to atmospheric correction?
How important is it to correct Landsat for atmosphere, haze and convert DN to reflectance? What impact does it have on the results, say for many of the vegetation indices?
11
votes
1answer
299 views
automating roof orientation detection from satellite imagery
A while ago I did a neighbourhood roof orientation survey for solar panel deployment, by visually checking each roof and marking individually whether they were south or almost south-facing.
As this ...
10
votes
2answers
437 views
NDVI in urban environment
What considerations should be taken into account when trying to derive a NDVI from an urban environment?
I pulled a tree canopy layer from LAR-IAC data and used an NDVI of 0.38. However, this FAQ on ...
9
votes
6answers
376 views
Resources for Calculating the Geometry In Oblique Photographs
Currently I am using supervisory classification algorithms to calculate the landuse within a certain image, the issue being the images are sourced from high oblique photography. I know the focal ...
8
votes
3answers
1k views
Land Cover Feature Extraction from Satellite Imagery
I'm interested in a low-cost or open source solution for creating land cover GIS layers that utilize both spectral and textural extraction algorithms. I have used PCI Geomatica, ENVI, and Feature ...
8
votes
3answers
298 views
Preferred programming language and software for entire remote sensing workflow?
I have been involved in remote sensing for some years now during studies. I am wondering which combination of software and image processing modules would be most suitable for an entire process chain ...
7
votes
9answers
2k views
What is the best open source software package for Remote Sensing?
Here are many questions with great answers about open source GIS software.
I am wondering, what is the best open source software package for Remote Sensing? I would like to learn it and to use in my ...
7
votes
3answers
2k views
free GIS software that can orthorectify?
Would someone care to recommend a free and/or open source GIS application that can orthorectify map images?
7
votes
5answers
196 views
What technique is used to acquire client location?
So far I know how to grab the client location to a application or web application by using the users geolocation or GPS location. I remember the possibility of finding the users approximate location ...
7
votes
2answers
109 views
How to perform enhancement operations on an satellite imagery in QGIS?
I am a new user of QGIS please suggest how to perform image enhancement operations on an satellite imagery like ratioing, contrast stretching, edge engancement, filtering etc. in QGIS?
6
votes
5answers
272 views
Processing Full-waveform Lidar?
Does anyone know of a good software package for processing full-waveform lidar? Also, does anyone know of a good tutorial on processing full-waveform lidar?
6
votes
1answer
192 views
How to remove clouds in High resolution Imagery(.5 mGeoeye)
i have imagery with high resolution .5m, large parts covered with clouds,so it's obscure many urban areas.
thank you.
6
votes
3answers
138 views
Classifying small structure in water using IR band
I was wondering how to identify small structures (eg. beacons) in a water body. I have worked with RGB images and its almost impossible to classify waterbodies in these images.
How does IR band help ...
6
votes
1answer
947 views
How to fill gaps in SLC-Off Landsat 7 ETM+ Images with QGIS?
Explanation of the problem:
On 31 May 2003 the Landsat 7 Enhanced Thematic Mapper (ETM+) sensor had a failure of the Scan Line Corrector (SLC). Since that time all Landsat ETM+ images have had ...
6
votes
2answers
413 views
Imagery Database/Metadata Store
I'm a Remote Sensing PhD student, and as such I have a large number of satellite images that I'm working with. I'm starting to fail to keep track of them all and I have a lot of metadata that I want ...
6
votes
2answers
505 views
Transform SPOT5 images to natural color images
We're currently using PixelSense to convert raw SPOT5 images to natural color ones for display and printing. Do you know a good algorithm to perform the same task as we want to ingest raw images in an ...
6
votes
0answers
207 views
Land Classification with Spectral Python (SPy) [closed]
Does anyone have experience working with the Spectral Python module for land classification? The following k-means clustering example takes an iterative approach to classification through pixel ...
5
votes
2answers
331 views
Disaggregating aggregate GIS data using remote sensing
I haven't really done much with remote sensing imagery. I have census data for an area, and a TIFF raster image of the area.
I'm sure this is possible, is there a simple way to disaggregate the ...
5
votes
2answers
379 views
Moisture Interpretation from Landsat Images
I am working on a "land suitability for crop" project. Can anyone let me know how to get any type of information which can be related to moisture index of soil?
I have Landsat 5 data with band 3 and ...
5
votes
3answers
513 views
ENVI EX reviews?
Does anyone have a review of ENVI EX? I am wondering how well the Feature Extraction and Image Classification workflows function.
5
votes
3answers
160 views
Is it possible to automate the detection of clearcut areas in optical satellite imagery?
Given optical satellite or aerial imagery of a resolution similar to the image below, is it possible to accurately detect clearcut areas? Is their research or documentation that supports a specific ...
5
votes
0answers
62 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 ...
4
votes
6answers
302 views
Looking for free DEM and other remote sensing data for Germany
Does anyone know of any sources for free DEM
and other remote sensing data in Germany?
I don´t think Europe is as open as the USA when it comes to free data!
4
votes
1answer
102 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
2answers
105 views
Remote sensing software options for creating structure footprints from aerials
As shown in screen shot here, just wondering what other software options for creating polygons based on structure footprints are available.
Something cheaper than ENVI but still versatile would be ...
4
votes
1answer
557 views
Open Source Remote Sensing vs eCognition, ERDAS etc Is it worth it?
What, if any, would be the main benefit of using a commercial tool like eCognition (in particular) or ERDAS as opposed to something like Orfeo Toolbox or OpenCV? (Feel free to suggest other open ...
4
votes
1answer
263 views
Statistical analyses for survey against raster?
I am somewhat of a newbie to geostatistical analyses, but pretty
familiar with GIS and remote sensing packages. I was wondering if
anyone had suggestions on appropriate geostatistical analyses for a
...
4
votes
1answer
439 views
Difference between Albedo and Surface Reflectance
Can anyone tell me what is the difference between Albedo and surface reflectance? I know for sure that they are not the same. Any links / comments are most welcome.
Thanks
GBh
4
votes
0answers
150 views
What GIS applications use Google Glass?
From techcrunch.
I see a lot of press coverage about Google Glass, yet I haven't seen details of GIS apps that use it.
What GIS applications use Google Glass?
3
votes
6answers
1k views
shadow simulation from buildings
is it possible to use hillshade function in ArcMap to calculate shadow areas of buildings or simulate shadows of buildings, using DSM of the buildings and the sun angle and azimuth?
3
votes
2answers
72 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?
3
votes
2answers
590 views
Net Primary production (NPP) calculation
When I calculate Net primary production (NPP) for a local scale, what kind of software should I use? I always use ENVI, ERDAS, ARCGIS and IDRISI. Is it possible to use these programs for NPP ...
3
votes
1answer
156 views
Cloud and Snow Differentiation
I am doing unsupervised classification of a mountaneous terrain and I have used 500 classes to classify the land use. In my result, cloud and the snow are categorized in the same class. How do I ...
3
votes
3answers
323 views
Remote sensing: How to define landuse from remote sensing data?
I am trying to research ways into obtaining landuse data for a project which calculates the visual impacts of wind parks.
I have a DEM and DOPs for a relatively large region (5000km²), but I have no ...
3
votes
1answer
337 views
Slope, aspect and beam in R.Sun (GRASS)
I'm starting to mess about with the solar radiation packages of GRASS and ArcGIS and have become rather stuck on the GRASS side of matters. I have a DSM area, and that is feeding into GRASS well ...
3
votes
2answers
103 views
ENVI BIL file algorithm logic
I have a 6 band Landsat image, RGB and 3 NIF bands. As far as the Band Interleaved by Line (BIL) method goes, the resulting image should have, and I quote ENVI manual:
the first line of the first ...
3
votes
1answer
124 views
MCD43A3 MODIS products
I have MCD43A3 product and I am using that to get the albedo values(Black sky and White Sky). I have some in-situ snow depth data, corresponding to which I want to get these albedo values.
For most ...
3
votes
1answer
127 views
Calculate Blue sky albedo from Black sky albedo and White sky albedo
I have got values for Black sky albedo and white sky albedo, from MODIS imagery. What is the simplest way to calculate blue sky albedo? I want to use albedo for snow cover.
A website which has listed ...
3
votes
1answer
175 views
About FAPAR calculation
I want to calculate FAPAR in different land cover types using max and min value of NDVI. I have a raster image with 9 Land cover types and max, min value of NDVI in each land cover type. But I don't ...
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