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.

learn more… | top users | synonyms

1
vote
2answers
81 views

Is it possible to split a picture taken with a regular digital camera into real spectral RGB channels?

I have no idea how the sensors inside a camera work. I know I can take jpeg and separate the R, G and B channels but I have no idea whether these channels are the real red, blue and green in visible ...
0
votes
0answers
97 views

Identifying dwellings/homes from imagery using ArcGIS for Desktop?

I have a task where I need to identify dwellings/homes on property lots. The data that I have is an aerial image of the town, cadastre/property boundaries, land tenure information and land-use. I ...
1
vote
1answer
35 views

How to convert GOES-R (15) IR image from gray-scale to brightness temprature

How do I convert satellite IR images taken by GOES-R (15) from gray-scale to brightness temperature? We can download the IR satellite images, and read its RGBA values. But how can we convert this RGBA ...
0
votes
1answer
57 views

Understanding InSAR interferometry?

I understand that the result of InSAR interferometry yields a LoS deformation and if deformation in the vertical or horizontal is to be computed, it should require additional gps observations at the ...
3
votes
3answers
160 views

Atmospheric correction for pansharpened imagery?

In converting DN values to radiance as well as reflectance, do we use the same equations in raw satellite imagery for pansharpened products? I saw this DigitalGlobe technical note for DN to radiance ...
1
vote
0answers
55 views

SRTM DEM and satellite DEM fusion

I have a SRTM DEM and a DEM derived from satellite (Cartosat). Both the DEMs are registered perfectly. Now I want to carry out a DEM 'fusion' process to derive a higher quality output DEM. I am not ...
0
votes
0answers
28 views

I am looking for Thermal IR Photography with 1 m resolution?

I am looking for thermal IR photography with 1m resolution? It needs to be recent or maybe a company in western Canada that can fly a mission like this. Satellite or flown photos both work, I am just ...
2
votes
1answer
19 views

STATION_ID of satellite images

My question might be simple but can someone explain to me the importance of STATION_ID to satellite images?If the sensor is the same(e.g landsat TM) for 2 images but the STATION_ID is different (MLK ...
1
vote
0answers
25 views

LULC using SAR data

I have a Geocoded SAR data with me. I have to perform LULC classification. I have been given a shapefile (vector data) with the different LULC categories of the region. The region is mainly composed ...
4
votes
1answer
85 views

What is NIR LiDAR?

Can LiDAR sensors collect near-infrared (NIR) data at the same time or does there need to be a separate NIR camera that is combined with the LiDAR data after collection? Blue Marble makes reference ...
1
vote
0answers
52 views

Effects of heterogeneous vegetation in mapping canopy cover using randomForest in R

I have a 5.8 m resolution satellite image (LISS IV by IRS-P6, in bands 4, 3 and 2) of a densely forested region in the Eastern Himalayas. My objective is to predict regions of canopy cover. Regions of ...
1
vote
1answer
66 views

The stability of randomForest models after increasing predictor variables

With reference to the posts: Incorporating terrain data to predict canopy cover using randomForest in R and Random-Forest Classification of 10cm Imagery for species-distribution in R (no point-shapes) ...
2
votes
1answer
79 views

Incorporating terrain data to predict canopy cover using randomForest in R

This is a subjective question. Thank you bearing with me. I have a 5.8 m resolution satellite image (LISS IV by IRS-P6, in bands 4, 3 and 2) of a densely forested region in the Eastern Himalayas. My ...
-1
votes
1answer
36 views

How to create ASCII time-series files to make TSM_GUI in TIMESAT? [duplicate]

I would like to create TSM_GUI in TIMESAT, but as an input i have to choose ASCII time-series files, but I have only .tif images. How can i do that? Many thanks
0
votes
1answer
63 views

Creating raster depicting landcover/use change in ArcMap?

How would I create a conversion matrix in ArcMap 10.2.2 to display the changes between two rasters (Land Use Land Cover Maps)? I have produced Land Use Cover Change maps from temporal satellite ...
4
votes
0answers
173 views

Which remote sensing satellite is best used for chlorophyll mapping?

Location of my research are reservoirs which have an area of 47 and 62 km2. I need a better image resolution than Landsat(Pan).
0
votes
0answers
144 views

QGIS Raster Calculator giving a NaN output

This is my first time using QGIS and I am trying to use it to generate NDVI maps from data captured by my UAV. However when I apply the NDVI formula in the raster calculator using my NIRGB image the ...
1
vote
0answers
28 views

Cloud and cloud shadow identification with MERIS

I am looking at MERIS images to use for marine applications (Chl-a. SPM) and would like to confidently remove cloud and cloud shadow pixels from the data. I have a few ideas: Using the blue band ...
0
votes
1answer
60 views

Satellite Images for the Mediterranean Sea Oil Spill

I am looking to obtain free satellite images to detect oil spills in the Mediterranean sea. What sensors would be most appropriate for this task and where can I download this type of data?
0
votes
0answers
17 views

using variogram for texture in remote sensing

I have a classified image which created with 1500 samples. I want to use the variogram for the texture of categories in order to have better results. To use the variogram I need to have a big number ...
1
vote
0answers
33 views

Using NDVI values as covariate in survival analyses

I am trying to become more familiar with processing NDVI values in GIS. However, despite its usefulness, it seems to have some limitations. Namely, creating NDVI values across a large scale can be ...
2
votes
1answer
33 views

How to interpret BUFR descriptors

I'm processing BUFR products from Eumetsat and I would like to ask for your help about the following descriptors: 002028 SEGMENT SIZE AT NADIR IN X DIRECTION 002029 SEGMENT SIZE AT NADIR IN Y ...
1
vote
0answers
56 views

Extract Differential Interferometry from SENTINEL-1 image

I downloaded some SLC images from scihub.esa.int . And I want to extract Differencial Interferometry from them by using SNAP-ESA software ( if you have other softwares that can do the same work I ...
1
vote
1answer
60 views

Doing NDVI when nir data is given as 3 bands

I have been provided with two data sets of the same area, one with normal RGB bands and one with NIR data. My problem is that since the NIR data is given as 3 bands, i am not sure how I should ...
1
vote
0answers
33 views

Modis Daily LST Data is mean of all day or it is on satellite path time?

I am looking for MODIS LST product which is exactly on the same time that satellite paths from a location,I have searched and found MOD11A1 but It seems that it is mean LST of Day,Is there any product ...
2
votes
1answer
144 views

How can I parse modis MOD13Q1 quality layers in R?

I'd like to parse MOD13Q1 VI quality layers in R. My original code must have been incorrect, because it gave lots of "deep ocean" flags in the middle of Brazil. After the changes suggested by ...
1
vote
0answers
61 views

Layer Stacking landsat 5 surface reflectance high level data

I downloaded the surface reflectance landsat 5 scenes but when I layer stacked them my image was not how I imagined. I manually used atcor on normal scenes and it looks nothing like the scenes I layer ...
2
votes
1answer
186 views

Using Erdas for land cover land use change detection

New to Erdas but I have to do a project and I have chosen to do a landcover land change detection. I have two Landsat 5 images, five years apart from each other. My question is: what is my next step? ...
0
votes
0answers
112 views

Error in downloading MODIS image using R script

I am trying to download "MOD13A3" MODIS image using R script (http://r-gis.net/?q=ModisDownload) but each time it's ending in error. How to make it work ? ...
1
vote
1answer
27 views

Adding GeoEye1 sensor to grass i.atcorr

Following the instructions, I've updated the iwave.h and iwave.cpp files using the official spectral responses from DigitalGlobe (In the iwave.h file I don't know if it's necessary to use more ...
7
votes
1answer
484 views

Remote sensing for Nepal Earthquake [closed]

To any experts who can provide remote sensing data that can help assess impact and damage of nepal earthquake we really need your help to ensure aid is well targeted. Existing data so far is here If ...
0
votes
1answer
46 views

Finding Sentinel-1 data from the hub

Can somebody please tell me how to download data from specific locations on the sentinel-1 data hub? I cannot seem to get the geospatial search function to work... Many thanks for guidance!
1
vote
1answer
133 views

IR/R could not detect when using landsat 8 in ERDAS 2014 Is there a alternative way around?

I'm using ERDAS 2014 and I upgraded from ERDAS 2013. I am doing a lot of band indices for various kinds of such as clay, ferrous, Mineral composite and so on.. from landsat 8. Using the indices in ...
2
votes
2answers
260 views

Accuracy assessment in eCognition

How to do accuracy assessment of classified images in ecognition? I have done the image segmentation for Worldview-2 image. Then, I have processed for classification for class names (e.g ...
0
votes
0answers
48 views

Classifying beach/mudflat area of Landsat Images

For my work I need to capture the total catchment area of a beach using mostly Google Earth images. I attached an example with this post. So the whole catchment area comprises the sandy beach as well ...
1
vote
1answer
34 views

How to convert an endmember collection spectral signature file from OLI sensor to TM and ETM+ sensors

I'm working on some supervised classifications using scenes from the landsat legacy archive wich include ETM+, TM 5 and OLI data from 2001 to 2014. I have training and validation points for each scene ...
1
vote
0answers
48 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
15 views

How to classify land cover with MMU 25hac

By using the 30 meter resolution of landsat TM & ETM+ data, I want to create the land use/ land cover map. I have read in several studies to first decide about the minimum mapping unit (MMU) that ...
1
vote
1answer
121 views

How to remove band from stack in ERDAS 2013?

I have a Landsat 8 scene where I have stacked 11 bands. I need to remove one band from the stacked layer. Is there a toolbox in ERDAS 2013 that allows me to take out a band? I am aware that ENVI ...
0
votes
1answer
25 views

NDVI for natural region

I have a question about remote sensing, I appreciate that if somebody can answer to me. I have remote sensing data which I have got from landsat 7. The area which I am working on is combination of ...
1
vote
1answer
90 views

Python/GDAL hyperspectral Image wavelengths

I can open and read a hyperspectral image using GDAL according to the instructions brought by Max König here: So after reading the data like this : data = gdal.Open( filename ) then I can see ...
5
votes
2answers
688 views

What are LiDAR returns?

Can someone help with an explanation and some references, in order to understand the nature of return pulses within a LiDAR system.
0
votes
1answer
47 views

When parametric classifiers fail?

In which situations are statistical assumptions (e.g. multivariate normal distribution within spectral classes) for parametric classifiers (e.g. maximum likelihood ) not valid for land-cover ...
1
vote
0answers
111 views

Landsat 7 band 6 VCID 1 (LOW) or VCID 2 (HIGH) for temperature map?

I want create water temperature map with Landsat 7 on QGIS. Band 6 converting to temperature, I read the landsat handbook with formula: T= K2/ (ln((K1/L)-1)). Band 6 has VCID1 "low" and VCID2 "high" - ...
1
vote
2answers
135 views

Where to download 4-band NAIP imagery for California?

I've been trying to find orthoimages with 4 bands for a couple of counties in California. I managed to download some from the GeoSpatial Data Gateway from the USDA (NRCS), but they all only have 3 ...
4
votes
2answers
257 views

Image processing using Python, GDAL and Scikit-Image

I'm new here and I'm sorry if I do something wrong. I am struggling with a processing and hopefully I will be able to solve here. I work with Remote Sensing applied to Forestry, especially working ...
3
votes
1answer
73 views

Calculate change in canopy height over 10 years?

I want to know how many "tall" trees (greater than 30 m) fell down between 2005 and 2015. I have LIDAR imagery from 2005 and 2015 from an area where many tall trees are known to have fallen due to ...
1
vote
1answer
63 views

How to create an image of maximum pixel values from an input layer-stack image in ERDAS Imagine?

I have 12 MODIS images (one of each month). I want to create a single image having maximum annual pixel values for each pixel. I did layer stacking operation in Erdas Imagine 13, but how to extract ...
4
votes
3answers
147 views

Estimating vegetation composition from digital images

I am running a Master's project researching Greater prairie-chicken nest and brood survival. Some of my intended covariates include local vegetation measures using digital imagery. I would like to use ...
2
votes
1answer
59 views

View feature space for multi-band files

I am trying to plot a feature space (scatter plot) for some SPOT images in QGIS 2.8.1. I know a histogram is available in the file properties, but I want to plot eg. Band 1 vs Band 2 to see the ...