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Apr
26
comment SLD Editor with GUI?
AtlasStyler did the work for me too.
Apr
18
revised What is the best/easiest way to obtain temporal Landsat imagery?
added link to Help Documentation
Feb
17
awarded  Revival
Jan
28
awarded  Enlightened
Jan
28
awarded  Nice Answer
Dec
11
revised grass gis i.atcorr input should be reflectance or radiance
Restructuring and Info about Scaling
Oct
14
comment Confidence in pan-sharpened classification?
There are many studies that do use pan-sharpened images as an input to be classified.
Sep
18
comment How to classify land cover with MMU 25hac
I'd suggest to firstly perform a classification that respects the image's native spatial resolution (30 by 30). Or even, if you pan-sharpen, and get good results, use the Panchromatic's higher resolution. Then, depending on your workflow, you can generalize.
Sep
18
comment Should Endmembers be Normalized for Linear Unmixing?
You could consult statisticians which work in biology related disciplines.
Sep
18
comment From Landsat spectral radiance (W/m2*sr*µm) to Global horizontal irradiance (W/m2) for mere mortals
If you still haven't, check out JRC's Photovoltaic Geographical Information System - Interactive Maps and their available for download Satellite based solar radiation data. Recently I derived global irradiation on inclined surfaces time series maps using various inputs and, of course, r.sun.daily.
Sep
8
comment Free open satellite or other remote sensing data for night time?
If you care to calibrate the NOAA DMSP OLS derived night-time lights time series, you might be interested in a GRASS GIS add-on that implements well known calibration models: gitlab.com/NikosAlexandris/i.nightlights.intercalibration (or trac.osgeo.org/grass/browser/grass-addons/grass7/imagery/…).
Jun
26
comment GeoTiff exported using GRASS will not open in other programs
What does cannot get to recognise mean? Any error message? Or simply a blank image? Did you check for color-tables issues? Did you check the statistics of the GeoTiFFs inside Arc*? Please, report the composition of the group itself (the group in GRASS-GIS' database) and the output of r.info for the raster maps that compose the group in question.
Jun
9
comment how i calculate land surface temperature using landsat 8 in Envi 5.1
Nothing for ENVI, but maybe of interest for GRASS GIS users: github.com/NikosAlexandris/i.landsat8.swlst
Jun
9
comment Atmospheric correction for pansharpened imagery?
Maybe you could rephrase the title. The questions are about converting from DN to Top of Atmosphere Radiance/Reflectance.
May
30
comment Asking linear regression between NDVI and LST using ENVI
Off-topic: how did you derive LST from Landsat8?
Apr
8
comment Pansharpening Landsat 8 tiles in Grass 7
As for the i.pansharpen process, please post the range of raster values just before calling i.pansharpen, for example, what does r.info -r LC81740382014220LGN00_refl4 report? Check also gis.stackexchange.com/a/67319/5256.
Apr
8
comment Pansharpening Landsat 8 tiles in Grass 7
In order to compile an add-on, you need to have GRASS GIS' source code. Please read the respective README file. I have no access to a Windows machine. Someone, though, has installed and used i.fusion.hpf under Windows, as can be seen in this "issue" discussion.
Apr
8
comment r.recode rules file issue
@randusr836 Can you accept your answer?
Apr
8
revised Is d.mon xN deprecated in GRASS in favor of something in the wxGUI?
added 3 characters in body
Apr
1
comment Pan sharpen Landsat 8 using Grass 7
The sharpening effect is obvious in the screenshots (more details on the right image). Yet, the colors are not vivid/contrast not high(?). Maybe the appearance can be improved further by experimenting with i.colors.enhance. What is the purpose of the sharpening in this case? Nice visuals or subsequent classification?