Questions tagged [unmanned-aerial-vehicle]

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

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34 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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20 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
49 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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23 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
19 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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35 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 ...
3
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2answers
71 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
195 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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0answers
75 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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49 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
34 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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0answers
115 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
56 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
112 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. ...
0
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1answer
83 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
50 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 ...
0
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1answer
70 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
36 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 ...
3
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1answer
133 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/...
3
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1answer
113 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
75 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 ...
2
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2answers
52 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
60 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
54 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 ...
0
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1answer
168 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 ...
0
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2answers
51 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
39 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....
2
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1answer
56 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
23 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 ...
3
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0answers
66 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? ...
3
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1answer
928 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
37 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 ...
2
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2answers
161 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 ...
1
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1answer
1k 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
29 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 ...
2
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0answers
23 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 ...
2
votes
1answer
91 views

OpenDroneMap returns error on merging depthmaps?

I am doing a reconstruction on 424 Parrot Sequoia RGB images using OpenDroneMap. The reconstruction runs for about 2 hours then throws the error shown below. I have successfully done several ...
0
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0answers
104 views

Creating 3D Local Scene using pointcloud, DSM, and orthomosaic from Drone in ArcGIS Pro?

I am trying to create a local 3D scene in ArcGIS Pro and display data fro drone flights. I have the orthomosaic from the flight as a .tif, the Digital Surface Model as a .tif, and my pointcloud from ...
2
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0answers
55 views

Radiometrically correct one UAV image

Does anyone out there know how to perform radiometric corrections on a single image taken with a multispectral sensor? I know there is proprietary software (such as PiX4D) that can do this; however, ...
0
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0answers
73 views

Filtering trees with Mac

I own about 200 acres of forest with about 350' of elevation change. I have a DJI 4 Advanced and my goal is to produce elevation maps to plan the building of one or more ponds. I've tried and failed,...
2
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0answers
989 views

Changing the spatial resolution - stacked raster in R

Want to change higher spatial resolution UAV dataset stacked in R. Used raster package to stack the individual band. Want to change the spatial resolution to 1 m. stacked_UAV <- stack(stack_list)...
0
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1answer
81 views

Accounting for orientation for a UAV image

I have a series of images that were taken with MicaSense RedEdge sensor attached to a UAV. My final goal is to input these images into mapping software (ArcMap, ENVI or QGIS) and be able to do stuff ...
0
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3answers
149 views

Mosaic UAV image step by step using ArcMap?

I have 20 pieces of UAV image, and using ArcMap i want to mosaic it all to become one raster but step by step, what i mean is mosaic image 1 & 2, image 3 & 4 ...... then result of 1&2 ...
4
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1answer
67 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 ?
2
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1answer
136 views

Smooth mosaicking of smaller orthomosaics to form a homogenous mosaic

This image below is generated using Erdas Imagine where I used mosaicpro tool to create a super mosaic of orthomosaics generated using PIX4d I used following options: Color Balancing Color Dodging ...
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2answers
73 views

Combining multiple mosaics into single one using ArcMap?

I collected 615 images with Phantom 4dji. My computer couldn't process all of them together on Agisoft Photoscan, so I separated my photos by area, making five orthophotos. My goal is to combine all ...
2
votes
2answers
843 views

Performing Radiometric Calibration of Sequoia Imagery? [closed]

I recently bought a used Sequoia camera and when I bought it, I was under the impression that the sun irradiance sensor and calibration plate would calibrate all my images in real time and I wouldn't ...
4
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0answers
133 views

Processing drone Images of body of water?

I took some pictures of a body of a body of water using a multi-spectral sensor attached to drone. When trying to process the image using Pix4D, more than 50% of pictures were unable to calibrated. ...
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0answers
92 views

Photogrammetric point cloud classification

My question is regarding the point cloud classification and editing work for a photogrammetric point cloud generated using drone based imagery. My objective is the generation of a digital elevation ...
0
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1answer
152 views

Error importing ground control points ArcGIS Pro

I am working on processing aerial images from an automated drone flight in ArcGIS Pro. The photos import into the Ortho Mapping workspace just fine, and the Quick Adjust alignment runs without ...