Questions tagged [imagery]

Imagery refers to raster based datasets acquired from sensors on satellites or aircraft.

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22 views

Identify Pavement Markings from Satellite Imagery and export to shapefile

I have a 10cm x 10cm aerial photo of a city which I plan to use for classification of pavement markings (e.g lane arrows, lane lines, bike stencils etc.). Currently, the process I'm envisioning to ...
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41 views

How are map tiles created?

I have recently been diving into the world of maps and I got interested to know how map services work, like Google, Mapbox, Leaflet, Open Street Maps and many others. I was confused about the ...
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Combining image collection from different years using Google Earth Engine

I'm trying to estimate superficial runoff for urban areas, but aparently having problems to generate for 2020. The NDVI collection goes to 2020, but the urban collection only goes until 2019. In line ...
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25 views

Low resolution of imagery in Google Earth Pro

I want to convert an ECW into a format I can load into Google Earth and keep the quality(or at least ok quality, when I convert it to a TIFF or KMZ it is very low res). I am hearing talk about how ...
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Landsat 8 Collection 2 (C2) Level 2 Science Product (L2SP)

I am exploring data sources for land surface temperatures (LST) for summer 2021. From Landsat 8 Collection 2 Surface Temperature (https://www.usgs.gov/core-science-systems/nli/landsat/landsat-...
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gdalwarp on County-wide mosaic or COG takes forever or seems to hang

I am creating Cloud Optimized GeoTIFFs using gdal from a folder of TIFF files in GDAL for an entire county. After creating a mosaic of these files (in EPSG:6551) using gdalbuildvrt I can create a COG ...
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39 views

Reason behind the white line on a SAR image?

So I'm reading a paper about satellite data and SAR imaging and I came across this image. I couldn't help but notice this white line running from top to bottom of this example image. Does anybody know ...
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How to remove black stripe on hyperspectral image band?

I saved individual bands from a hyperspectral image and saw that some bands have this big black stripe that run from bottom to the top of the image. I tried applying some filters available on ENVI and ...
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35 views

Seeking free satellite imagery basemaps to be used in webapps with frequent updates

I am looking for satellite imagery base maps to be used in my web application. I have been using Google satellite base maps, but they are very old. I need something which has frequent updates, weekly ...
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Sid image files and Orfeo Toolbox

Does anyone here know if the open source remote sensing/image analysis program Orfeo be made to work with .sid files? I can't find the answer in the documentation, every time I try to load a sid it ...
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Empirical Line Method (ELM) in ArcGIS Pro (2)

I am working with Remotely-sensed imagery (10x10cm) from the Netherlands. My images from 2017, 2018, 2019 and 2020 from the same area, recorded in the same time of the year, all look different ...
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28 views

MBTiles to PostGIS

I have an MBTiles file /database containing aerial imagery. Does any one out there know of a way to store a MBtiles database into a PostgreSQL/PostGIS database?
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47 views

QGIS SAGA's Principal Component Analysis (PCA) makes output rasters (components) bigger

I have multispectral TIFF bands/features (dtype = float32) that I passed onto QGIS SAGA Principal Component Analysis tool to perform PCA. The bands are each a separate file but have exactly the same ...
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30 views

Export Canvas extent inside QGIS at a 1m resolution GeoTIFF format

I am working with the "XYZ Tiles Google Earth" inside QGIS and I have an area of interest that is roughly a 2 nautical mile radius that I would like to export as a GeoTIFF with a 1m ...
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1answer
25 views

Conversion of UAV DN values to reflectance

My aim is to carry out fusion between Sentinel 2 and UAV images. Sentinel images are already converted to reflectance values but UAV images are in DN number format. How can I convert UAV DN values to ...
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ArcMap 10.7, Is it possible to mosaic rasters using a method that prioritizes rasters by the proximity to it OWN center?

I am working with older imagery that has been manually scanned, and as expected, the fidelity of the images is more reliable towards the centers of the images. There is a good deal of overlap in the ...
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Water color significantly different from different relative orbits?

I've been examining satellite imagery (Sentinel-2) and noticed that water can look significantly different in images from different relative orbits (seems to happen consistently for the examples below)...
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25 views

QGIS georeferencer's output incomplete

I am georeferencing some tiff images in QGIS using the same settings for the goereferencer's parameters. A couple of images were referenced fine but for others the georeferenced output raster is ...
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Fixing local orthorectification mismatches leading to small georeferencing errors?

My project uses good quality high resolution orthorectified imagery (from the government) as its reference base layer. I complement it for vegetation analysis with additional imagery from a different ...
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87 views

Downloading Google Earth images in universal map downloader

How can I download Google Earth images in universal map downloader in 2015 and 2020? There isn't any specific option for select year.
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Should I always choose Sentinel-2 atmospheric-corrected imagery?

Sentinel-2 imagery is available in the default L1C form, or in the atmospheric-corrected L2A form. I haven't been able to find a L1C - versus - L2A comparison that would provide the pros and cons of ...
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20 views

Planet Images with Blurry Patches

I have downloaded some Planet imagery from the tropics (available for free), but the images have these blurry patches. Does anyone know what these are?
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Can't upload raster file on PostGIS

I've been trying to upload my satellite imagery which is 1.5 GB to my PostgreSQL database, using the code below, the error for each command is stated below; raster2pgsql -s 4326 -t auto -F -I -C -Y '....
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1answer
33 views

Automate making imagery index layer

I am wanting to come up with a way to speed up my Imagery Index layer. To give you an overview I have about 500 imagery files. They cover extents all over Australia. I am wanting to create a shapefile ...
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1answer
129 views

How to get whole image exported from Google Earth Engine?

I used the LANDSAT 8 TOA data to create an NDVI image. I want to export the image to my Drive. I have most of the code and it works, but I can't get the whole image in the export. It should cover the ...
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Is there a way to detect the status of the Esri world imagery basemap service programmatically prior to opening an MXD?

We have a web application that programmatically exports an MXD to a PDF. In this MXD, we have Esri's world imagery service added in one of the dataframes. However, when the imagery service is down ...
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1answer
182 views

Reprojection issue in Image collection after Filtering using Google Earth Engine

I am trying to reproject an image collection, but it fails after I apply filtering by (space, time, and cloudy cover percentage)!? Here is the code: Map.centerObject(geometry); var S2_f = S2....
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1answer
381 views

Is it possible to export the Google Earth Engine basemap (satellite version, not map), instead of something from an image collection?

I was originally going to use Landsat8 or Sentinel Data, but they don't go as clear as I thought they would. I'm looking for something at around 1m per pixel (Landsat8 is about 30m per pixel), like ...
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27 views

Custom Sensor type for New Ortho Mapping Workspace in ArcGIS Pro

Is it possible to bring a sensor type (Satellite) which is not yet included in the available sensor list to create a new Ortho Mapping Workspace in ArcGIS Pro using Python ?? for example the sensor ...
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2answers
168 views

Combining imagery, masking and sampling in Descartes Labs Platform

I am trying to sample data from Descartes Lab imagery to train a random forest classifier in the Descartes Plaform for an agricultural region. I have already written a script to prepare the imagery of ...
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1answer
532 views

Merge neighboring image tiles into a single image

I have a set of satellite image tiles from Bing Maps (info here). The tiles' names specify tile coordinates within the tile system and zoom, e.g. 156608-142775-18.jpg. An example set of tiles: ['...
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1answer
2k views

Using rasterio to crop image using pixel coordinates instead of geographic coordinates

I'm trying to extract a series of random patches of image from a larger satellite image (from worldview3). I want to extract patches of uniform size (say 512x512 for example). If it were a normal ...
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2answers
184 views

Interpretation of NDVI values

This might be a trivial question, but please bear with me. So I am using python and Sentinel images and I want to calculate NDVI, which is (NIR-RED)/(NIR+RED). So in the case where the final result ...
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1answer
124 views

Why using buffers in land use / land cover classification task?

I am following the tutorial How To: Land-Use-Land-Cover Prediction for Slovenia and I would like to understand why they used a positive buffer (expanding boundary limits) in the first part of the ...
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1answer
139 views

Saving as/export results of GeoVisual Search (Descartes Labs)

I am working with satellite imagery processing. I'm using this service to search for some objects in the US: https://search.descarteslabs.com Can I export about 1k results, for example, to KML or ...
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1answer
26 views

Does geospatial server software exist which can support dynamically generated imagery as a WMS?

Here's the situation: Input: A bunch of data (NetCDF) that contains seperate variables/arrays for R/G/B channels. Desired output: Web service (e.g. WMS) that can serve simulated true-color imagery ...
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19 views

Retrieve image from area

I'm looking for a way to retrieve an image (a satellite one, preferably) from a rectangular area of a map given a minimum and maximum latitude/longitude. What tools can I use to achieve this?
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1answer
27 views

Image collection images to a 1D vector where there is one value corresponding to each image

I am currently working with MODI's land surface temperature image collection dataset of 20 years of data. I want to convert each image to a single value representation using mean/max function. I tried ...
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51 views

How do I extract data about the curve of a coast line from a satellite image using Google Earth Image?

I'm trying to use GEE to analyse the shape and curvature of ocean coast lines from satellite images. What I've been doing so far is: isolating an image from GEE, saving it as a png or jpg, and ...
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1answer
52 views

Seeking a GNSS data to be use for my work [closed]

I would like to understand what GNSS is used for? Can I download it from the website and use it for my work? I am not familiar with it. Does it come with the GPS? Does it come with horizontal ...
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1answer
47 views

Interpreting Historical Aerial Imagery - Agricultural Midwest [closed]

I was recently looking at some aerial imagery of a Midwest farm and wondering how to interpret a couple things. First, in the 1938 imagery, there are several fields that appear to have weird ...
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1answer
80 views

Earth Engine: How to input band values of image to a tensorflow model trained on array of values

I have a TensorFlow model that is trained on an array of reflectance values (red, green, blue, nir) to predict sediment (SSC). Now, I want to use Landsat 8 image over a region to get the SSC for ...
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60 views

Replicate the Google Earth Engine satellite basemap for analysis in code editor

I need high resolution cloud-free raster imagery (<1m resolution) for Montana, USA. Visually inspecting the Google Earth Engine satellite basemap looks to be higher resolution than NAIP imagery (...
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1answer
124 views

How to chessboard segment landsat pixel edges in python?

Does anyone know how to do a chessboard segmentation (in the same way that ecognition does) that will select all the edges of a Landsat pixel in python/a Jupyter notebook? Given that I can use the ...
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37 views

Satellite imagery tiles not aligned

I downloaded LISS4 satellite imagery of my study area, consisting of multiple tiles. I digitize some area from one of the tiles but I found out that the other tiles don't seem to align with the first ...
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54 views

Publishing Image Services in ArcGIS Server vs. Tile Cache Data Store

Historically I've published images services through ArcGIS Server, but I now have an ArcGIS Enterprise tile cache data store on a dedicated server and I'm considering moving some image services over ...
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2answers
4k views

Obtaining Free High Resolution Satellite Imagery to use in QGIS

I just downloaded QGIS 3.10 Mac version the other day and I am still very green with the program. I was wondering what is the best way to obtain high resolution satellite imagery? I know there are ...
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1answer
469 views

Issue when transforming an EE.Image into numpy array

I use Google Earth Engine with Python 3 with Colab's notebooks. I would like to transform the Google Images into Numpy arrays to be used for further processing. I am using the toList Reducer to ...
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55 views

Satellite Imagery Comparison

Earlier in my searches I had come across this website which provided a fast switchback between all the map providers (Apple Maps, Google, Bing, OSM) where you had the chance to compare the satellite ...
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Combining two images one over other using ArcPy [closed]

I have to combine images from different satellites (with different spatial and spectral resolution) such that features of both are present in the final image. I am using ArcGIS. Please help me with ...

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