Questions tagged [unmanned-aerial-vehicle]

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

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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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35 views

Importing .obj exported from OpenDroneMap into QGIS

I took images with a drone and stitched them together with opendronemap, the export is a file with .obj extension with its corresponding .png file for texture. How can I open this in QGIS to generate ...
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43 views

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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22 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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1answer
20 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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34 views

Understanding difference between Flight Angles (FlightYaw/FlightPitch/FlightRoll) and GimbalYaw/GimbalPitch/GimbalRoll

I am working on a project that requires me to extract/compute the orientation of the CAMERA in the world coordinate system. I have gone through the documentation (Flight Control, etc) but I am unable ...
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1answer
154 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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23 views

DJI Phantom 3 Pro [duplicate]

I want to use UAV to get digital elevation model for geomorphological researching and, while trying finding suitable UAV with reasonable price, I found out DJI Phantom 3. More over, I found it very ...
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1answer
45 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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2answers
22 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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1answer
47 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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27 views

Georeferencing Tool in QGIS 3.1: Getting NULL Z-Value with DSM layer when 'rubber sheeting'

I am using the Georeferencing tool/plugin in QGIS 3.1 to try and 'rubber sheet' two layers together. My reference sheet is a LiDar data set (ESPG 2961- NAD 83), pixel size 0.0709, -0.0709. The sheet I ...
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1answer
68 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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1answer
735 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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53 views

How to implement multilevel classification in eCognition (segmenting imagery at different scales)

I am trying to perform a ground cover classification in eCognition using UAV RGB imagery of a forest ecosystem, with multiresolution segmentation algorithm and NN classification. Since there are ...
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1answer
109 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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28 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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1answer
39 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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48 views

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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3answers
228 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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1answer
304 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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120 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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54 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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1answer
45 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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208 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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1answer
57 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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1answer
181 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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1answer
134 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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1answer
61 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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1answer
84 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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1answer
42 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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1answer
211 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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1answer
144 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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0answers
83 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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2answers
83 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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0answers
69 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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2answers
59 views

GPS coordinate of center of a grid

I am working on a project to identify weeds. I used the grid to separate the area. Each cell is marked weed or no weed. I would like to get the GPS of the center of each cell with a weed in it. Does ...
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1answer
228 views

Weed Identification With QGIS [closed]

Does anyone have any experience trying to locate weeds in agricultural drone images? I am currently using Dztesaka classification tool to find weeds. It works pretty good. But there may be some ...
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2answers
55 views

Where is the option to correct for rolling shutter in ESRI's Drone2Map software?

I am looking for the proper way to enable a software fix for rolling shutter in Drone2Map.
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0answers
43 views

Co-registering multiple temporal orthomosaics?

I have multiple (19) orthomosaics of the same approximate region taken regularly over the course of a couple months with a UAV. Some, but not all, include ground control points we placed in the scene....
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1answer
63 views

Drone Imagery Footprints & Quaternions [closed]

I'm trying to use Drone Imagery Metadata to plot precise (or nearly precise) Imagery footprints on the the ground and I need some help with Photogrammetry / Trigonometry / Quaternions My repo is ...
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0answers
29 views

Calculating the error in a cut and fill between two surface models

I have a LiDAR suface model from 2006 and a LiDAR surface model from 2013. These two surfaces have about a 0.4 foot (0.12m) difference between the Z values on an adjacent road (2013 is 0.4 feet ...
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0answers
83 views

GRASS GIS Segmentation issue on UAV image

I tried i.segment to perform segmentation on a part of UAV orthophoto image, but this always results in stripe-like rectangle segments which I do not expect. Could anyone figure out what happens? ...
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1answer
1k views

Getting coordinates of pixel from georeferenced drone photo?

I have a problem with geo-referenced photos from a DJI drone. I have the coordinates of the center of the photo and the metadata related to the photo and I would like to know how to go from a pixel to ...
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0answers
40 views

Adding tiled map to QGIS and exporting as web map

I have a set of drone imagery that was processed using Agisoft PhotoScan and converted to Map tiles. I am now looking on how can I add the map tiles in my QGIS for exporting as a web map? I have a ...
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2answers
181 views

Post Orthorectification error reduction? [closed]

I am trying to orthorectify an old aerial photo that has control points. When I run an output and then validate it I find some offset or distortion. What should I do to fix this? Does anyone have ...
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1answer
2k views

Software Recommendations: make a flyover video from GPX log? [closed]

I m trying to make a video similar to this (at 53 seconds): https://youtu.be/OEU5BCZV6Sc?t=53 from GPX logs we have from our drone. Google Earth Pro software doesn't allow nearly enough customization, ...
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0answers
30 views

Making Shapefile Hybrid Micro-Plot Boundary?

We would like to analyze in the field of precision agriculture the performance of a lot of hybrids that are planted in lines with no border between them. For this we need to make boundary or a border ...
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0answers
24 views

Filter pictures in directory

I have a drone project with 50,000 pictures in 50 layers. Each layer has 2 to 5 zones. When I put them all together, we have a lot of overlap and in some places, we have up to 4 pictures of the same ...