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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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1answer
14 views

Problem downloading and using NOAA CCAP data

I am trying to download CCAP land cover data and would have expected .img or .tiff files, but the data downloads as a disk image file. I cannot figure out how to access/work with this file type. any ...
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0answers
28 views

How to de-stripe a Landsat 8 band with python?

I am working with Landsat 8 images and some of the bands have striping, e.g.: I've been going down a rabbit hole by looking for a solution for this. Does anyone know a python library that could be ...
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0answers
21 views

ALOS/PALSAR High Q DEM 12.5 Accuracy

Does anyone know the XYZ accuracy for the Phased Array L-band Synthetic Aperture Radar (PALSAR) DEMs (12.5 x 12.5 px)? Is there a document for reference?
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18 views

Blank Image After Terrain Correction

I am new to snap. I have downloaded sentinel 1 image from ESA. I have performed radiometric cal-liberation as well as speckle filtering. After that, when I tried to perform terrain correction, the ...
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0answers
34 views

Calculate Bare Soil Line Intercept using R

I am using an R package called BSL (Bare soil line), package is at https://rdrr.io/cran/landsat/man/BSL.html. The BSL package uses R's lmodel2 function (https://cran.r-project.org/web/packages/lmodel2/...
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1answer
40 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
15 views

Pleiades atmospheric correction

I have phr1a and phr1b images (Pleiades) and I need to make atmospheric correction. First, I tried to do this by using Envi FLAASH. by the way, I tried also ERDAS atcor but there was also same ...
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1answer
28 views

How to calculate average value of points located in each pixels in R?

I have a raster(.tif) and point(.shp) layer. To calculate the average value of points located in each pixels: (1) For each image pixel that include multiple points, the average value of all points ...
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1answer
26 views

How to download MODIS NBAR(MCD43B4)product?

Description: The MODIS nadir bidirectional reflectance distribution function adjusted reflectance (NBAR) product (MCD43B4), 1 km spatial resolution and a composited 16 day temporal resolution. ...
5
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1answer
134 views

InSAR processing: why can't we just compute distances directly from time delays?

My question can be very basic, but even after studying quite a few tutorials on InSAR processing, I still do not understand one thing: if we know a wavelength, speed of light, a time delay it takes ...
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0answers
19 views

Decision Tree (J48) integration with IDL/ENVI

Does anybody know a method for integrating J48 - Weka Decision Tree Algorithm with ENVI IDL? Weka's J48 produces complex decision trees, which I find incredibly time-consuming to feed on ENVI's ...
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1answer
32 views

Can radiometers measure radiations in the infra-red at night?

I started reading about passive sensors and radiometers in particular. I know that microwave radiometers work day and night and in cloudy conditions. Thermal radiometers can measure energy during the ...
3
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1answer
51 views

Performing Supervised Classification of Houses in Africa using ArcMap?

I am doing a supervised classification in ArcMap to classify land cover types in a study area in Africa. I am using RapidEye satellite imagery (Planet Labs) and they have 5 bands: blue, green, red, ...
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1answer
39 views

How do I create a binary mask using Pixel values from a Numpy Array over a certain value (i.e. >1000), in Python [closed]

I would like to create a binary mask using the height values from a Digital Elevation Model, and export this out as a tif. For example, generate a mask for areas over 50m My code so far: from osgeo ...
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1answer
36 views

How to mask out the shadows in Sentinel images using Google Earth Engine

This question is an addition to this question. Rodrigo E. Principe showed how to mask out the clouds as the answer of the asked question. I am wondering if there is a way to mask the shadows as well. ...
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0answers
11 views

Changing a shapefile to aoi file in ERDAS, but somethign is weird about the shapefile

I am trying to change a shapefile to an aoi file in ERDAS imagine, however, the shapefile I have is not the same as the ones I have seen in tutorials on how to do this. The shapefiles in tutorials are ...
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0answers
19 views

BULC-U Sharpening Resolution with Earth Engine with Bayesian Updating of Land Cover

There is a recent study and a very interesting classification technique for sharpened land cover maps. Basically the GlobCover 300m resolution is improved to 30m, as the landsat images. This paper ...
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2answers
29 views

Do I need to do Radiometric Normalization for time series analysis, if I'm using L2_Landsat8_SR data?

I'm doing some forest change detection across several years using L2_Landsat8 Surface Reflectance data. And I am implementing the method available in R (landsat::relnorm) for relative radiometric ...
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1answer
22 views

Focal length vs Principal point

I have set of areal imagery. One of a parameters I get with images is camera's Principal Distance , what I'm looking for is Focal length, but I don't have Focal length at the moment I tried to ...
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0answers
34 views

Converting tree crowns into 32x32 images

I am working on a raster (.tif) of trees which are standing in rows (as illustrated in the image below) and I want to do a PCA analysis on this data. What I would like to achieve is a table containing ...
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0answers
18 views

Is it possible to perform time series analysis on Landsat imagery data?

I have a 20 years of the Landsat imagery data for which I need to perform some analyses including cropping them to some specific geographical locations and extracting the surface reflectance values ...
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0answers
37 views

How to detect cloud's shadows with Sentinel2/SentinelHub?

I'm trying to detect clouds and their shadows on Sentinel2 images with SentinelHub service. For clouds detection, SentinelHub team has developed a good tool but I would like to detect cloud's shadow ...
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1answer
28 views

Appropriate resolution for regression analysis

I'm using ArcMap 10.3. I'm a student working on a research problem where I'm taking Landsat imagery (at 30-meters resolution) and regressing it against other datasets captured at different scales (up ...
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0answers
19 views

What subset of bands would be most suitable for crop yield prediction?

I am working on a project to predict crop yield at district level from MODIS satellite data for India. For that purpose I am choosing MODIS product MOD13A1 which provides vegetation indices at 500 m ...
0
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1answer
16 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
34 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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0answers
71 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 ...
2
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1answer
34 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 ...
0
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1answer
42 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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0answers
12 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 ...
0
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1answer
55 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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0answers
30 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 ...
4
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1answer
40 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
38 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
23 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
35 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
45 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
276 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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0answers
26 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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0answers
71 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
59 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
22 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
146 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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0answers
34 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 ...
0
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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
1k 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
190 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
73 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
18 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
269 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, ...