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.
0
votes
2answers
134 views
Remote sensing: How to start with interferometry?
I need to start learning about the interferometry techniques available/used for remote sensing data (radar or optical).
Which are the main applications?
Which techniques are applied?
Which Earth ...
2
votes
1answer
127 views
Sandbars feature extraction from satellite image
I want to know if we can analyse
the permanancy of sandbars from a satellite image? Whether the formation of the sandbar is permanent or temporary.
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 ...
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 ...
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 ...
1
vote
1answer
410 views
How to make a cloud mask from a daily MOD09 image?
I'm currently working with MODIS data and i've been having some trouble with several aspects of the steps I need to take.
For example, I need to make a cloud mask from a daily MOD09GQK image, and i'm ...
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!
2
votes
2answers
108 views
What exactly is 'anti-aliased image generation'?
I tried to google it, but didn't quite get it. Any help and/or examples?
Thank you!
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 ...
2
votes
1answer
472 views
QGIS and satellite images band combination
When I add a satellite images as a raster in QGIS:
1. Why the image is changed, it looks like it has only one band?;
2. where is a tool for band combination?
Thanks!
13
votes
6answers
328 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 ...
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 ...
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 ...
1
vote
0answers
59 views
How to open files in OpenEV from command line with an LUT pre-applied?
In OpenEV, how can I load multiple files from the command line with an LUT pre-applied (a phase color ramp, specifically), rather than having to go in and apply it manually to each file? Is there ...
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 ...
0
votes
1answer
123 views
Problem running i.gensigset in Grass. Any ideas?
It just returns ERROR: Unable to create signature file. It doesn't say why... Anyone had this before and found a solution?
3
votes
3answers
663 views
Problem with NDVI image value
I'm really happy to find this website. It is very helpful for the learners of Arcgis.
Now I wanna ask a question. When i open NDVI image in ENVI, its value is still within the range (-1 to 1). But ...
2
votes
1answer
209 views
To determine phenological events based on Greatest increase NDVI appraoch
I have a problem with a phenological study. The study area is in temperate zone of Asia. I have been doing phenological research using MOD VI product. I wanted to extract phenological events ...
3
votes
2answers
591 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
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 ...
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 ...
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 ...
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?
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 ...
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, ...
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 ...
1
vote
3answers
963 views
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 ...
0
votes
0answers
487 views
buildings shadow areas calculation
is it possible to calculate shadow areas of buildings or simulate shadows of buildings in a city using e-cognition software, with the DSM of the buildings and the sun angle and azimuth known?....if ...
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?
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?
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.
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 ...
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 ...
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 ...
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 ...
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?
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