Questions tagged [remote-sensing]

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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2answers
39 views
+50

How to calculate and export tasseled caps from MODIS collection in GEE?

I would like to calculate and export the brightness, greenness and wetness tasseled caps for the MODIS MCD43A4 V006 collection based on the Lobser coefficients, but I have no idea how to do it. var ...
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0answers
25 views

EVI, SAVI, LAI Time Series Analysis in Google Earth Engine using Sentinel 2?

Can someone please tell me how to perform Time series analysis(TSA) for EVI, MSAVI, LAI Indices as they have to be done mathematically in Google Earth Engine code I'm finding it difficult, I have ...
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2answers
510 views

How to add color-map scale in Google Earth Engine?

I want to add a colormap scale like below in my Earth Engine app. I cannot find a UI component for this. Can I do this in any other way in Earth Engine?
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0answers
29 views

Is it possible to detect human settlements by night light data?

I am working on a project in which human settlements are identified using geo-tagged Twitter data. Since this project is focused on developing countries (mostly African), I am afraid that many human ...
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0answers
16 views

Is there a way for me to create grid square statistic method for a certain area in Google Earth Engine?

I came across a paper that provides a method of doing grid-square statistics that can be done on the satellite data. This is constructed based on the latitude and longitude where no grid square ...
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1answer
28 views

Atmospheric correction for planet images using ArcGIS Desktop

I am very much new to the field of image processing. I have several images from planetscope. 20190722_155754_1049_3B_AnalyticMS is one of them. I don't know how to process these images in ArcGIS ...
2
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1answer
227 views

Convert Planet Imagery Surface Reflectance product DN to surface reflectance values

I have a PlanetScope Ortho Scene Product (3B) which includes an AnalyticMS.tif and AnalyticMS_SR.tif files. Based on what I have read so far, the AnalyticMS_SR.tif file is scaled surface reflectance ...
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0answers
23 views

Whether NOAA AVHRR NDVI V5 already remove cloud?

We want to use NOAA/CDR/AVHRR/NDVI/V5 datasets for analysis, but we are not sure if the NDVI already remove the cloud and cloud shadow or not? Need we use 'QA' to remove the cloud and cloud shadow ...
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0answers
13 views

Planetary Reflectance vs Relative Spectral Response

I am confused between a Planetary Reflectance and the Relative Spectral Response (RSR). What I know/guess is that RSR is a response/function of an Instrument band's reflectance against a spectral ...
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0answers
20 views

Is the Enhanced Vegetation Index normalized?

I am trying to figure out if the Enhanced Vegetation Index (2-band) is normalized or not? My first guess is that it is, but due to a multiplication factor of 2.4, I'm not sure if it is or not. The ...
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0answers
15 views

Produce NDVI on Landsat1 sattelite images?

Does someone have experience with producing NDVI on the Landsat1 satellite image? What kind of atmospherical correction (on Landsat 1) is necessary to perform before producing indices? Is it possible ...
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1answer
338 views

Calculating albedo values with landsat 7 ImageCollection/FeatureCollection error in Google Earth Engine?

I am facing a technical difficulty with Google Earth Engine I am trying to retrieve the albedo value of the state of Idaho by using Landsat7 TOA reflectance imagery over the span of a year. ('2005-01-...
3
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1answer
2k views

Export data from time-series image collection to a table in Google Earth Engine

On Google Earth Engine, I'd like to accomplish two tasks: extract data from every pixel, across a time-series, within the given geometry bounds and save it as a table. I need a column which prints ...
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1answer
61 views

Moisture Stress Index - how important is seasonal influence in a deciduous forest?

I want to calculate moisture stress index for a deciduous forest using the formula from the article 'Detecting vegetation leaf water content using reflectance in the optical domain' (Ceccato et al. ...
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0answers
31 views

Seeking reference books for remote sensing undergraduates [closed]

I am looking to build up a small GIS Library at work and am surrently looking for remote sensing literature. I need a few books about remote sensing for theoretical and practical purposes and seek ...
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2answers
61 views

Spectral signatures chart in Google Earth Engine

I have been reading the documentation and some related questions online, but I cannot seem to make it work. I use Google Earth Engine to access an old Landsat 5 image, and classify later on. I want ...
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1answer
688 views

Landsat / MODIS spatio-temporal fusion: STARFM and software implementations

My main goal is to create Landsat/MODIS image pairs, perform an spatial-temporal fusion which leads to synthetic composites on dates between Landsat acquisition dates. This brought me to the paper ...
6
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2answers
324 views

Convert hdf5 LiDAR data (from GEDI) to LAS or LAZ

I downloaded GEDI LiDAR data in hdf5 format. How can I open this file or convert it to the standard LAS format (point cloud)? When I tried opening the hdf file with QGIS and I got the following ...
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1answer
3k views

Landsat 8 Collection Level 1 and 2

When I access Earth Explorer, I have the option for downloading images for both Landsat 8 Collection Level-1 and Level-2. For Level-2 I have a brief description that refers to "Surface Reflectance". ...
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1answer
37 views

Conversion of MLS/AURA RELATIVE HUMIDITY PRODUCT to correctly referenced GeoTIFF

I have downloaded the following product https://cmr.earthdata.nasa.gov/search/concepts/C1251101764-GES_DISC.html and it gives me a .he5file. Can anyone help me in correctly geo-referencing the file ...
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1answer
27 views

What sources of free multispectral satellite imagery are there in Europe other than Sentinel 2?

I am looking for free multispectral satellite imagery for north Germany prior to 2015. Does anyone have a list of sources?
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0answers
10 views

Erdas does not generate tie points

I'm working with stereopair images (2 times 4 images) in Erdas Photogrammetry. I've converted them to IMG filetypes, setup interior orientation and put full GCPs on all images. I added few tiepoints ...
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2answers
46 views

Extract cell values and coordinates from raster using a polygon in R

I'm trying to extract cell values and coordinates from raster using a polygon in R. I have multiple raster layers with different types of values, all within the same extent. I have multiple polygons ...
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0answers
16 views

When working with MOD09GA product, is supposed QC bitmask for high aerosol quantity to return 4 values?

it's the first time I'm working with MODIS data and I am a bit confused about how bits work and how masks are created. After a bit of research I've been able to understand, more or less, how bit ...
3
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1answer
33 views

RGB composite of Landsat 8 bands not plotting correctly (Python, GDAL)

I am trying to create a natural color (RGB) image from Landsat 8 data (11 bands). Bands 4, 3, 2, correspond to red, green, blue respectively. When I stack them, however, the images i am getting are ...
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1answer
31 views

Geolocation of L2G-Lite MODIS data

I would like to know if I am processing an L2G-Lite MODIS product, do I still need to geolocate, or reproject it to EPSG:4326? Or can I just leave it?
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0answers
52 views

Calculating proportion of pixel containing vegetation (from sentinel 2 image stack)

My task is to perform a supervised classification of landcover across a huge (20,000+ hectare) property. I need to classify into three classes: forest, regenerating trees, and soil. We use s Sentinel-...
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1answer
97 views

Landsat mask shadows due to rugged topography in Earth Engine

I am working to produce a snow duration map in GEE, but since the area of interest is mountainous I am having trouble with north-facing slopes. I've learned that a solution exists for Sentinel in ...
2
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1answer
81 views

Terra MODIS MOD11A1 LST values

I am having a hard time to figure out what this information refers to. It is stated at the product description of Terra MODIS MOD11A1 product (Wan et al.,2015). (from https://lpdaac.usgs.gov/products/...
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1answer
46 views

Extracting DEM from PRISM data?

I have PRISM data which is in the following format. Are there any ways (software and methods) to extract the DEM or elevation information from these data files?
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1answer
55 views

Seeking remotely sensed data for measuring urban gardens?

One of the students in my lab is currently seeking methods for measuring the very small size of urban green spaces in people's gardens. Is there a data set out there that may be appropriate for this?...
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2answers
60 views

Min and Max for each image of NDVI to calculate Em and LST

I am working on my script to calculate LST for all the images in the collection separately and then use the calculated LST to estimate Mean Annual LST. I have calculated NDVI for each image, and the ...
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1answer
66 views

How to export raster of Mean Annual Land Surface Temp from Landsat Imagery?

I am using google earth engine to estimate Mean Annual land surface temp of a local scale from 1984 to 2019 from landsat Imagery. I am having trouble determining a script for my goal, there are many ...
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1answer
46 views

How to visualize large .tif file which is a multispectral image

This image is supposedly a 5m multispectral multi-temporal (LISS IV) data of a place in India called Satna. It is a .tif format file of size around 32 MB. Image should typically have greenery(...
2
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0answers
29 views

ArcGIS Pro 2.4.0 Image Segmentation - Higher spectral and spatial detail for high-resolution images?

I was watching a video regarding image segmentation in ArcGIS Pro 2.4.0. It was an ESRI event (2018), so the presenters were ESRI employees. Here's the video I am referring to: https://www.youtube.com/...
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0answers
19 views

Batch downloading LANDSAT imagery based on nearest image capture date

I have a 30-year large dataset (100,000+ points) of insect outbreaks (0=no out break, 1= outbreak) throughout Australia. I am interested in seeing if the spatial configuration of vegetation is a ...
6
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1answer
4k views

Selecting bands of image collection in Google Earth Engine?

I want to use the Landsat 8 surface reflection collection (LANDSAT/LC08/C01/T1_SR), which contains the 7 spectral bands plus some extra mask bands. I want to run my algorithm on just the 7 spectral ...
0
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1answer
51 views

Mask clouds across multiple images using Google Earth Engine

I Have multiple Landsat8 images at the same place in different years. I want to have a cloud mask for each image, then merge the mask so that all images will be masked with a same aggregated mask. I'...
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2answers
241 views

Computing MNDWI for Sentinel 2 Images in Google Earth Engine?

MNDWI is the normalized difference of Green Band and SWIR Band. In LANDSAT both are of a similar resolution i.e. 30m. In the case of LANDSAT var landsat8 = ee.Image("LANDSAT/LC08/C01/T1_RT_TOA/...
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1answer
90 views

Unable to download VIIRS images with GIBS API and gdal_translate

I'm trying to download some VIIRS images from GIBS API. I'm using gdal: gdal_translate -projwin 19.07 42.16 28.39 34.5 -of "GTiff" "viirs.xml" "VIIRS_SNPP_DayNightBand_ENCC.tif" The viirs.xml file ...
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3answers
2k views

How to analyze Vegetation Index using Sentinel-1 SAR Imagery?

I am using the ESA open scientific data hub for Sentinel 1 SAR imagery (Interferometric Wide swath SLC VV polarization) and would like to know how to perform vegetation health analysis from this data? ...
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2answers
9k views

Layer stacking Sentinel 2 imagery

Is it possible to layer stack all 13 Sentinel 2 bands or can I only layer stack those that are the same resolution (so for example the blue, green red and NIR bands). I have a very large area of ...
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1answer
41 views

Seeking open source software or python packages to create orthomosaic and DEM image from UAV images [closed]

I would like to analyse UAV 2D images to create 3D point cloud, DES, and orthomosaic image. Can you suggest or mention some open source software or python packages?
2
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1answer
937 views

Seeking VIIRS Day Night Band and alternatives for night satellite images [closed]

Has anyone worked with VIIRS Day Night Band? I want to download few images to get a map of night scene of Central Europe (city lights etc). I use friendly interface at NOAA (http://www.class.ncdc....
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1answer
17 views

Pixel Size field in gdalinfo command meaning

What is the meaning of the Pixel Size field in the gdalinfo output on a TIFF image? I have 2 images, one is a PAN image (size 400MB) while one is a DEM (size 25MB). Both are in TIFF format. When I ...
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1answer
791 views

Accuracy assessment in Erdas imagine

Is it necessary to do an accuracy assessment for an unsupervised classification done for a Landsat 5 image?
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2answers
642 views

Get ASTER full bands file

I am having some problems on downloading ASTER data. When I download a Landsat-8 scene, it cames with the full bands on it (14 band files), an metadata file and a quality file. I need to download ...
4
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2answers
2k views

Detecting cloud shadows

I am trying to detect cloud shadows in Landsat images. I came up with producing good shadows and cloud masks. Now I'd like to implement my cloud mask adding cloud shadows. Do You have a good idea to ...
0
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0answers
151 views

What does Google Earth Engine's image.unmix() differentiate from other implementations?

I want to realize a project with spectrally unmixed Landsat imagery. However, I find no satisfying information on the respective GEE function, image.unmix(). I processed a few scenes with the exact ...
2
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2answers
1k views

ENVI band math incorrect values

I'm attempting to calculate vegetation indices in ENVI 5.2 using level-2 AVIRIS data in band math. The indices I'm working with are Vogelmann Red Edge 2, normalized difference red edge, and red edge ...

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