Questions tagged [unmanned-aerial-vehicle]

An Unmanned Aerial Vehicle (UAV) or Drone is an aircraft without a human pilot aboard.

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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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-2 votes
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66 views

How to know current mosaic bands?

I work with sets of images from sensors such as: DJI P4 Multispectral DJI P4 PRO MicaSense RedEdge-MX MicaSense RedEdge-P Then, I extract plant attributes from the mosaics. For this, I need to know ...
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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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6 votes
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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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2 votes
1 answer
117 views

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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1 vote
1 answer
36 views

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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1 answer
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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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2 votes
1 answer
121 views

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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1 answer
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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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1 vote
1 answer
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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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1 answer
241 views

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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328 views

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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90 views

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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1 vote
0 answers
55 views

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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124 views

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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0 votes
2 answers
542 views

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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1 vote
0 answers
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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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0 answers
80 views

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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2 votes
0 answers
79 views

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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0 votes
1 answer
101 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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2 votes
1 answer
978 views

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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1 vote
1 answer
220 views

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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2 answers
162 views

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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1 vote
1 answer
79 views

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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2 votes
1 answer
79 views

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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10 votes
1 answer
2k views

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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0 votes
1 answer
247 views

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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37 views

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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1 answer
121 views

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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4 votes
3 answers
502 views

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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1 vote
1 answer
458 views

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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0 answers
219 views

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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0 votes
0 answers
71 views

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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2 votes
1 answer
73 views

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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1 vote
0 answers
369 views

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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5 votes
1 answer
66 views

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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1 vote
1 answer
294 views

Finding long, lat coordinates of points on building pictured by drone

How do I get the formula for calculating lat, long coordinates on the attached picture? Here is the EXIF file. The problem is that we don't know the horizontal distance from the building to a drone. ...
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1 vote
1 answer
263 views

Selecting grid cells by color of image

I have a surface model raster layer. Is there any way to select only the light colored cells? Or just the cells with a certain color characteristic such as color value? This is a DSM of crop plots ...
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  • 157
1 vote
1 answer
83 views

Producing plant height with digitial surface model

I am trying to produce plant height with a digital surface model "TIF" file that was obtained with a drone. I have clipped out the section with plants and then used "Gap Fill" to produce a digital ...
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  • 157
0 votes
1 answer
113 views

Using QGIS Processing Modeler to split polygons with lines

I am trying to use the QGIS Processing Modeler to split polygons with lines. Here is the workflow I have so far. It is sucessful. I then add "Grid" and "Split With Lines" to split the polygons. ...
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  • 157
1 vote
1 answer
48 views

How to manipulate the lake water in the UAV image to make it better using QGIS?

I am having a georeferenced UAV image over the lake. The image is a mosaic of several tiles. While doing processings by the experts the lake region ia not perfectly processed and left with voids and ...
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3 votes
1 answer
285 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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  • 463
3 votes
1 answer
189 views

Abnormal Output of OpenDroneMap with GCP file

I am using a gcp_list.txt file with the following text: I am supposed to get a geo-referenced mesh object like this: But, I am getting something like this: I am running ODM locally in ubuntu 16 ...
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1 vote
0 answers
100 views

Implementing BRDF in R

I use UAS to survey vegetation at subcentimeter resolution for my research and have found that bidirectional reflectance (BR) is a huge issue that impacts the reliability of estimates across ...
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2 votes
2 answers
131 views

Citation of Mission Planner

I been using mission planner for some aerial survey study (as my ground control station and autonomous mission planner). However, I haven't been able to find all the information to properly cite this ...
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1 vote
0 answers
89 views

Getting Geometry error: One or more input features have invalid geometry from QGIS

I am trying to use the "Split With Lines" tool to split a polygon layer that consists 1000+ separate objects. Geometry error: One or more input features have invalid geometry. The tool keeps ...
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  • 157