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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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10 views

What's the timezone of 3-Hourly TRMM Data?

I am using google earth engine just to print the timestamp here of TRMM Data. I am using the geometry of a part of Chennai which is in India. // Filtering Data with Date and Geometry var Data1 = TRMM....
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1answer
19 views

What's the time zone of the timestamp of LANDSAT Images?

I am using google earth engine just to print the timestamp here of LANDSAT Image. I am using the geometry of a part of Chennai which is in India. // Filtering Data with Date and Geometry var Data2 = ...
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15 views

Sentinel 2 preprocessing with R

I need to transform Sentinel 2 L1C imagery to preprocessed Level 2A data. Ideally this should happen in R, as the remaining processing stack is already done in R. Are there ready preprocessing ...
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1answer
22 views

Performing Supervised Classification on Sentinel Image using ArcGIS Desktop?

Is it possible to perform supervised classification on Sentinel Satellite Image with the minimum error. I compared two raster, one being the manual classification of an area using Photoshop CS6 and ...
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1answer
25 views

Why is satellite imagery data delivered as signed 16 bit integers?

Landsat 5 tm reflectance product images are delivered as signed 16 bit images, why is this preferred to unsigned 8 bit that the DN's are stored as level 1 products for the same satellite? Look at ...
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8 views

Non-Resampled Landsat 8 TIRS Data?

Landsat website says that: TIRS bands are acquired at 100 meter resolution, but are resampled to 30 meter in delivered data product. Here, OP suggest that he was able to acquire non ...
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1answer
25 views

Google-Earth-Engine + Jupyter : filterBounds not working in Landsat imageCollection

I have a simple problem of not being able to select a single Landsat image using filterBounds within Jupyter environment. It used to work just fine in Earth Engine's online interface. I don't know why ...
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23 views

Automatically Recognised Targets for Combined Laser Scanning and Photogrammetry

I'm currently performing an engineering honours thesis on terrestrial photogrammetry and laser scanning in Archaeology. Both methods will be used to document a single location first and analysis will ...
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0answers
26 views

Estimating Soil Quality from Satellite Images

I am trying to assess soil quality based on Landsat 8 images of a woodlands area in southern Africa. I believe the criteria to determine soil quality will be based on estimating levels of soil organic ...
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1answer
35 views

Seeking algorithms for DEM generation? [closed]

What are the different algorithms employed for the generation of a Digital elevation model from images captured using an unmanned aerial vehicle ?
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1answer
28 views

How to Import the geometry/feature collection which is in GeoJSON format into Google Earth Engine?

I have a GeoJSON file. I have opened it in Sublime Text Editor How can I import it in Google Earth Engine?
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1answer
13 views

How to Import the Multipolygon with GeoJSON code in Google Earth Engine?

I have to import a MultiPolygon in Google Earth Engine and what I have is just this. {"type": "GeometryCollection", "geometries": [{"type": "MultiPolygon","coordinates": [[[[102.0, 2.0], [103.0, 2....
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1answer
21 views

EVI2 value calculated from MODIS MOD09Q1 not bounded by -1 to 1

I'm trying to derive from MODIS 8 day composite MOD09Q1.006 product My formula follows the standard interpretation: EVI2 = 2.5(NIR-Red)/(NIR + 2.4*Red+1) I already know that MODIS bands for NIR ...
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0answers
24 views

Understanding difference between collocation and coregistration?

I'm a little confused on this topic. I need to put 2 SAR images into same coordinate grid. In ESA SNAP tool, there are 2 options: coregistration: Radar->Coregistration->Coregistration collocation: ...
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1answer
154 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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23 views

What's stacking in time-series in Remote Sense?

I am learning time-series of remote sense. My adviser told me that there are two categories of time-series, slicing and stacking. I couldn't understand what's stacking is thought I know what stack is ...
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50 views

Read NetCDF chlorophyll data in R

I want to plot chlorophyll data in much the same way as is shown in the second part of this answer (I can run the first part perfectly with my data but I want a higher resolution map). The only ...
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1answer
43 views

How to save training data set [pixel values] from earth engine during classification?

Link to Earth Engine code:https://code.earthengine.google.com/4da2d54d1ece4229b76c52a9d921ca70 Below I have pasted my code: function maskS2clouds(image) { var qa = image.select('QA60'); var ...
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1answer
20 views

Finding Cubesat Data for remote sensing dissertation? [closed]

Where can I find CubeSat data so that I can compare it to other satellite data for my dissertation?
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2answers
74 views

Pansharpen landsat mosaic in Google Earth Engine

Does anyone have a good way to pansharpen an entire mosaic of landsat 8 images? I would use the Panchromatic band (band 8). I have found tutorials on how to pansharpen a single image, but not for a ...
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32 views

Seeking Soil Mapping data in Southern Africa?

I am researching soil quality in Zambia but I’ve been unable to find georeferenced soil datasets (e.g. soil samples) for my area of interest. Specifically, I want to get yearly soil sampling data in ...
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1answer
27 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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0answers
518 views

Get information about current coordinates and rgb values in openCV window

I have started to learn OpenCV python library for remote sensing data processing. And when I open window by: cv2.imshow I can't know x,y coordinate and RGB values in current mouse position. How to ...
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2answers
106 views

Getting RGB values of each pixel in a LANDSAT 8 GeoTIFF with Python 3

I'm working with a set of LANDSAT 8 Collection 1 Tier 1 GeoTIFFS pulled from Google Earth Engine, and I need to find the RGB values of every pixel in this GeoTIFF. I've tried using the code from ...
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1answer
43 views

Interpolate biweekly NDVI to daily using Google earth engine

How to interpolate time series data using GEE? For example, the Landsat have 2-3 observations per month, I want to interpolate the series of NDVI to daily scale and get 365 observations a year, then ...
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0answers
16 views

MODIS LST products add offset step

According to user guide for MODIS LST products, you must first scale the data by 0.02, fill value by 0 (which is removed, right?), and add offset by 0.0 before utilizing LST data. For add offset step, ...
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3answers
155 views

Download MODIS/MCD19A2 AOD product with R

I'm looking for a programmatic way to download MODIS/MCD19A2 AOD data in R. So far, I've found a pretty solid R package called MODISTools that works nicely with the MODIS/VIIRS RESTful API. However, ...
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0answers
31 views

Creating a Yearly Mean NDVI Layer with MOD13A2 Products

I would like to create a raster layer in ArcMap to show yearly (2011) mean NDVI values for the state of California, US with MOD13A2 products. Should I consider the Day of year VI pixel layer when ...
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1answer
30 views

Know of any existing quality training/validation datasets for land cover?

Looking to do some moderate res. global land cover mapping and need as much training and validation data as possible--does anyone know of any good/quality land cover/land use data that are freely ...
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1answer
135 views

Extract Pixel Values for Multiple Polygons and Images

I have 21 polygons and for each polygon I want to extract the pixel values inside them for Sentinel 1 images from 2017-01-01 to 2017-06-30. The example below shows how this is done for one polygon. ...
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2answers
149 views

Strips/scratches on PlanetScope imagery

I'm doing a project that evaluates the practicality of using remote sensing imagery in agricultural field management. I noticed there are some scratches/strips on PlanetScope imagery for one of the ...
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1answer
14 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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1answer
50 views

Vegetation height estimation with QGIS

Is it possible to estimate vegetation ( crops) height using free of charge satellites, like sentinel or Landsat, with QGIS?
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27 views

Filtering Images that Intersect with Features

I have a FeatureCollection with various polygons. I want to filter Sentinel1 images that intersect with each polygon. I can do it manually but adding each feature as filterBounds () one by one but I ...
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1answer
28 views

import ARCSI as module in python

Any way to work with ARCSI (Atmospheric and Radiometric Correction of Satellite Imagery) like any other python package? Can it be imported in a jupyter notebook? >>>import arcsi or is ...
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2answers
100 views

Sentinel 2 Bands + Deep Learning

I am trying to classify 9 different classes of Land use deploying Resnet Architecture. Sentinel images come with 13 bands and in RS we normally combine different bands for different classes for ...
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0answers
26 views

Masking out water in QA band

I am using QA band to study the cloud cover in a specific area. Visualization of the Landsat images with the clouds pixels value only has been carried out, but these clouds values have interfered with ...
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0answers
13 views

How to export images to JPEG images in Matlab/Ubuntu

I have processed my Landsat 8 data for previewing Band754, now I would like to export composite Band 754 image into JPEG images .I have used following codes in Matlab: system ([gdal_translate -ot ...
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1answer
32 views

How to convert a Feature Collection of one element (Multi Point Geometry) into a Feature Collection of different elements?

CODE: var l8 = ee.ImageCollection("LANDSAT/LC08/C01/T1_SR") .filterBounds(geometry); // TEST IMAGE var first = ee.Image(l8.first()).clip(geometry) // get image projection var proj = first....
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2answers
66 views

No Landsat across northern Australia in 1974-1977

Why there is no Landsat imagery available for the Gulf of Carpentaria, northern Australia, in 1974-1977? I have obtained imagery via USGS Earth Explorer from 1972 through to 2017, but there is a gap ...
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1answer
124 views

How to to extract coordinates of pixels inside a polygon in Google Earth Engine as a single feature? [duplicate]

IMPORTS: var geometry = /* color: #d63000 */ee.Geometry.Polygon( [[[-67.76435852050781, -22.213792811479802], [-67.76641845703125, -22.220785143658368], [-67.75646209716797, -22....
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1answer
26 views

How Do I search for MODIS data using pyModis?

I want to download the latest Modis vegetation Index Data(MODIS/Terra Vegetation Indices 16-Day L3 Global 250m SIN Grid V006) , whenever it is available for my Study Area. I know the Tile that my ...
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1answer
59 views

How to select all points of a polygon in google earth engine as a single feature?

IMPORTS: var geometry = /* color: #d63000 */ee.Geometry.Polygon( [[[-67.76435852050781, -22.213792811479802], [-67.76641845703125, -22.220785143658368], [-67.75646209716797, -22....
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1answer
36 views

Cloud Removal through Sen2cor for sentinel 2 images?

I have this imagery for an area of germany. According to docs of Sen2Cor, it states it can only remove haze and light clouds, i wanted to ask would it be possible to remove something as dense as shown ...
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0answers
11 views

Automated Mosaicing Two Modis Snow Raster Timeseries Datasets

I am conducting a study on snow cover variation in Lebanon. I have downloaded all daily Modis tiles MOD10A1 covering the study area for the period of 2000-2018. As Lebanon is located on the boundary ...
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1answer
56 views

Take pixel locations from rasterio raster and write out shapefile

I'm pulling a satellite image into python with rasterio, running some analysis to find a specific bounding box within that image, and then want to write those points out as a shapefile. I'm struggling ...
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0answers
55 views

authentication error for accessing data product on scihub through wget

I am new to Sentinel(overall remote sensing domain) and currently trying to download the data products from Scihub using the wget utility on Windows10 machine. However I am getting the below error. I ...
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1answer
51 views

I can apply tasseled Cap transformation in surface reflectance (not ToA)?

I can not understand if I should adjust the Tasseled Cap index with the surface reflectance values or the Top of Atmosphere
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1answer
50 views

How to select some n number of Random Points within a polygon as a single feature in Google Earth Engine?

How to select some n number of Random Points within a polygon as a single feature in Google Earth Engine? IMPORTS: var geometry = /* color: #98ff00 */ee.Geometry.Polygon( [[[73.85016678395664, ...
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1answer
187 views

Extracting values at specific latitude,longitude from MODIS swath data

I am trying to determine the amount of precipitable water vapor (PWV), ozone and aerosols as a function of time over specific spots on the Earth, namely our astronomical observatories. To do this, I'...