Questions tagged [unmanned-aerial-vehicle]
An Unmanned Aerial Vehicle (UAV) or Drone is an aircraft without a human pilot aboard.
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Calculating position of target of drone
We have an dji matricies 300 rtk video. I would like to detect position of something. Here an example photo what I would like to detect. Green rectangle is my target.Black rectangle is mid point of ...
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Calculating latitude and longtitude using yaw degree and distance
I have some drone videos and metadatas. I would like to find latitude and longtitude of center of image, if it is possible any point. To do this, I thought I can use altitude and pitch degree. Because ...
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Find the area of a raster created from drone data
I am trying to find the areas for a series of drone captured mosaic tiff data using ArcMap 10.8 which are irregular in shape. I have tried using Raster Calculator and multiplying by 0 to then use the ...
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Drone photogrammetry - power lines not lining up
We're using a DJI P1 processed in Metashape to create orthophotos. We're having problems with power lines being disconnected. Fences and other long, straight objects that are on the ground are all ...
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Removing RTK Correction from Images
I am doing a thesis research and I was supposed to analyze an un-corrected dataset (drone images collected only using GNSS).
When I load the images into Agisoft Metashape (professional version 1.8.4 ...
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Merge multiple geo-referenced *,jpg files into a GeoTIFF in QGIS
I have a set of georeferenced *.jpg files from a UAV flight and want to merge them into a GeoTIFF Mosaic. Is it possible in QGIS ?
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GPS latitude, longitude, elevation, and Total Station's Coordinates - can they be used together?
I have used DGPS to get the coordinates (lat, long) using UTM projection, and elevation (height above ellipsoid) for different points (set a). If I use one of the collected points location to setup ...
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Determine vegetation percentage cover from drone data in QGIS
I'm relatively inexperienced with QGIS.
I have a study site where I am testing multiple vegetation removal techniques to reduce fire hazards. I want to collect drone imagery before and 1 year after ...
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Orthophoto showing image banding along flight lines after reconstruction
I'm currently flying a mapping mission with a DJI P1 with the following flight parameters:
Altitude: 250m
Side/Forward Overlap: 60/80
Terrain Follow: Enabled
RTK: Enabled
Regardless of the time of day ...
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Problem with wrong DEM output after georeferencing
My goal is to georeference a DEM tiff file that I have with a reference orthophoto.
Steps to reproduce
Open orthophoto (EPSG2056) in QGIS
Open the DEM (EPSG2056) in the Georeferencer
Add GCP (I am ...
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Determine Lat/Long of "off-center" point of a top-down image
I am a computer science student with a top down photo taken by a drone. This drone has relatively low to zero gimble yaw/pitch (0-10deg), isn't very high up (~15m) in flat lands pretty close to sea ...
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Bare soil detection using drone images
I'm working with drone images which separated to red, green and blue bands. My task is to determine bare soil pixels. I've tried to swap bands in the composite, and calculate different differences ...
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Weird issue in orthophoto of canpy in rough terrain
After postprocessing drone imagery of a forest area in rough terrain, I had a weird issue such as in the images below.
The effect is like the cropping of trees following the DSM.
If you have ...
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Merging drone/photogrammetry-derived DEM and satellite-derived DEM using ArcGIS Pro
I have a DEM that was produced from drone images at a site of interest, processed through Agisoft Metashape. Because I used a drone, the site-level DEM boundaries/edges are irregular rather than ...
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Computing drone camera footprint over a DTM
I am developing a Python application to compute the footprint of aerial videos. I am able to compute the footprint when the sensor is parallel to the terrain and the terrain surface is plane.
Now, I ...
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Reusing regression or machine learning model in subsequent years
I have collected high-resolution UAV imagery and leaf area index (LAI) plot data. I plan on creating a model which uses my ground-based LAI to establish a relationship or train my UAV imagery. I will ...
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Mapping salinity indices to pixel values
I have studied papers related to Soil Salinity indices that include equations such as this paper here.
What I try for many days to find out, is how the increase or decrease in a Salinity Index is ...
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Setting Region with Python Loop in GRASS GIS not Updating to include Extent of Multiple Rasters
I am using the Python simple editor in GRASS GIS to write a script that can import multiple raster files into GRASS GIS mapset. The first for loop successfully pulls in the orthophoto and its relevant ...
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Checking if 2 UAV images have similar NDVI [closed]
I have 2 UAV images showing NDVI of the same plant field from different positions (meaning different coordinates, not different capture angle). I am trying to find a solution in order to compare ...
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Extract information from specific objects on UAV images
I am writing an application in PyQt5 that depicts images with objects inside. For instance houses. I need to check (somehow) the objects on the image and get the pixels’ values on that specific ...
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Can PPK (NOT RTK) be done with any mapping drone?
If PPK is by definition post processed and does not require a live connection to the base-station, why wouldn’t be possible to use any drone and post process the resulting coordinate data (assuming ...
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Batch increase drone imagery altitude by editing EXIF GPS information
I have around 3.600 drone images covering an area of around 2 x 4 KMs. The images were recorded using two drones. For some reason the images from one of the drones is off by around 15 meters in the z-...
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Correcting Drone-DEM data for Mosaicking using ArcGIS Pro
I collected four drone flights for DEM and orthomosaic creation. While all flights overlapped, each of the datasets has different vertical elevation ranges (because of the internal inconsistency).
How ...
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How can I get the channels of a .tiff UAV image and maintain the georeference
So, the idea is that I have a .tif UAV image. I need to get R,G,B,A channels into 4 separate .tif files by maintaining the georeferencing. So, for instance: Red.tif, Green.tif, Blue.tif and Alpha.tif. ...
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SCP Plugin for QGIS 3.16.7 Error 'raster is not loaded'
This is more of a FYI than a question...
I'm running SCP (semi automatic classification) 7.10.4 plugin to QGIS 3.16.7 under Windows.
I struggled quite a bit with the following roadblock:
Create a ...
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Given a point (x,y,z) and an angle/bearing distance calculate the end point (x,y,z) in python
I am trying to figure how to correctly code this. Imagine a camera is on a gimble against a 10 ft high drone. Old vector: {'X': 39.375346, 'Y': 10.0, 'Z': -84.208137} new vector: (30.130935697561846, ...
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Problems with segmentation of Orfeo Toolbox
I'm new to Orfeo ToolBox, and I started using the segmentation tool with an RGB orthomosaic from UAV in order to classify the different units. The result gives me a clear result with vegetation but ...
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Separating (grouping) different crop types that are phenologically the same
I have a bean farm plants UAV images, but they are different crop types, and others that are phenological the same. Can I cluster the plant fields using the UAV images? I cannot figure out from the ...
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Mapping image from drone in QGIS
Is it possible to map a drone image JPEG directly over a QGIS project as a layer or is it necessary to make some post processing, because it's not rendered on it's correct position?
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Creating maps in QGIS from Drone Videos
If it is possible to create maps in QGIS from Drone Videos, then how do I do it?
I've found software like DroneDeploy but QGIS being so long in this race, I feel more reliable. I have drone video ...
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Problems with tree height in CHM
I did a drone flight over a forest plantation and got the DSM and DTM. Later, I was interested in calculating the height of the trees within a plot. For this, I did a subtraction between the DSM and ...
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Calculating the coordinates of the selected pixel point from an image with known corner coordinates
How can I calculate the coordinates of the point(P) we want from an image with known corner coordinates?
I want to find out respective coordinates from the selected the pixel of the image obtained ...
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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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Georeferencing single drone image from metadata (gimbal angles, flight angles)
My question is in regards to the answer given to Georeference single drone image from EXIF data.
The answer describes how to georeference a single drone (DJI) image using EXIF data but, in the ...
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Classification of drone imagery (RGB) with SCP
How can I work on the classification in orthophotos (generated by Metashape from a DJI Phantom drone) when I cannot input the orthopoto into the band set? SCP does not find the raster of the ...
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How can I have the ground sampling distance from the images?
I have some aerial images and I need to know how if I can have the ground sampling distance value from the image without calculate it from the plane fly's parameters.
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How to improve the horizontal and absolute accuracy of UAV layer
I am working with two digital elevation model data sets: LiDar and UAV DEMs. Both flights were conducted in the same location along a coastal shoreline showing the intertidal area with lots of bare ...
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R - Calculated shapes should be perfectly symmetrical but are not - why?
I'm trying to generate shapes to describe the no-fly-zone around airports. What I'm getting is shapes that are not symmetrical around the line of reflection, so this is either my lack of understanding ...
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Georeference single drone image from EXIF data
Looking for an algorithm (python, formulas, whatever...) to georeference a single drone image based on its EXIF data.
Specifically, I need to translate drone GPS latitude and longitude (after ...
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Georeferencing multiple "slightly" overlapping drone orthomosaics
Situation:
I collected around 2000 drone images over 200 ha. My computer does not have the resources to render one large orthomosaic at once, so I decided to split my dataset into 8 and produce 8 ...
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Setting LAS Class Codes in ArcGIS Pro too slow
I have seen similar questions, but they don't quite relate to my particular issue.
I classified habitat in a high-resolution drone orthomosaic image of a 300-m long stretch of beach, then used Raster ...
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QGIS: multiple mosaics bands to 1 Visual RGB
I have UAV raster converted with Pix4D mapper in transparents mosaics blue, green, red, nir, pir.
Which tool can I use to translate into a visual RGB image?
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Difference between GIS mapping and Photogrammetric mapping
I can't seem to understand both type of mapping. I am planning to make a drone for mapping and I am confused about picking one. My purpose is to take photos of specific area and do 3D modeling of that ...
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Do I need IMU data for image stitching and orthomosaic generation?
Background: I am working on low-cost raspberry pi based camera system to integrate it on drones as an external module. So, I am using Pi camera and UBLOX Low cost GPS receiver which logs data in CSV ...
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Converting a FLIR image CSV to TIFF using Python
I have a geolocated CSV file containing one lat, long coordinate for the entire thermal image. I would like to convert this CSV to a TIFF using Python so that each pixel contains a temperature. All ...
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Automatically georeference non-intersecting UAS photos based on contained EXIF metadata
I need to know how to automatically create georeferenced rasters from multiple non-intersecting photos taken by UAS DJI Phantom 4 Pro.
All EXIF metadata is present in every photo - coordinates, ...
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Best way to correct UAS imagery sun glint over a water surface
I have a challenge of where there is a sun glint which includes both specular and non-specular brightening of a water surface on Unmanned Aerial Vehicle (UAS) imagery. Please see the raw image below ...
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Why do RGB values seem very high for my multispectral orthomosaic imagery?
I am using ArcGIS Pro (2.4.2) to analyze a 5-band multispectral image captured with a Matrice 200 (UAV). All image processing has been done with Agisoft Metashape, which includes calibrating spectral ...
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Building zig-zag lines (Drone flight path)
I need to create a line path like the one below.
I have to create a flight plan for an inspection with drone of a solar plant and I know the length of every single row and the distance between row, so ...
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Obtaining the average red, green, blue values within grid cells in QGIS?
Is there a way to obtain the average red, green, blue values within grid cells in QGIS?
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