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Questions tagged [unmanned-aerial-vehicle]

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

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1answer
21 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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17 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
18 views

Drone Imagery Footprints & Quaternions

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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15 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
43 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
120 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
27 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
133 views

Post Orthorectification error reduction?

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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0answers
12 views

Combining a vector layer with a Raster layer Geotiff orthomosaic and contour/Shp file

I am attempting to do the same as @shub but when I do the above process "Bring in a shapefile of your contours and make sure they have an elevation attribute with them. Go to Raster > Conversion > ...
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1answer
380 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
25 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
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 ...
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1answer
54 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 ...
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0answers
57 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 ...
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0answers
47 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, ...
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62 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,...
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0answers
330 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)...
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1answer
62 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 ...
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3answers
61 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
54 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 ?
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1answer
79 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
41 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 ...
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2answers
494 views

Performing Radiometric Calibration of Sequoia Imagery?

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 ...
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0answers
81 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
74 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 ...
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1answer
103 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 ...
6
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1answer
286 views

EVI calculation from UAV multispectral survey

I want to calculate EVI index from UAV multispectral survey. For satellite imagery it is pretty straightforward (after reading multiple posts on GIS.SE) but not sure how to approach this problem, when ...
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1answer
608 views

Photogrammetry route flown using Litchi misses photos at some waypoints

I have recently started using Litchi to fly waypoint-based photogrammetry flights with a DJI Phantom 4 Pro. The routes were created in DJI Flight Planner, then edited, uploaded, and executed in the ...
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1answer
209 views

Bringing drone maps into QGIS, CRS and scale bar [closed]

I'm looking for a guide to bringing files into QGIS so that the scale bar in print composer reads accurately. At the moment the files I'm bringing in are Geotiff and DEM. I know this has something to ...
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2answers
2k views

What is the difference between Key-Point, Tie-Point in Photogrammetry?

I'm looking into the reports & the Mechanism of UAV Photogrammetry software like Pix4D and AgiSoft. These two words are mentioned in a lot of support documentation, but they are defined no-where. ...
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1answer
71 views

Using drones in high mountain environments (Andes) [closed]

In my research, I am interested on deriving a [very] detailed vegetation and elevation maps, for this purpose I considered the use of drones (UAV). I do not mean to develop a drone but to acquire a ...
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1answer
88 views

Elevation correction

I have a digital elevation model produced from a drone survey via Drone Deploy. The file is a georeferenced TIFF. The z values in the raster are relative to the survey only and not to actual ground ...
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2answers
1k views

Postprocessing with NMEA-data if no rinex-data is available

I have an UAV which does not give me the raw sensor data (e.g. rinex or ubx). The only format I get is NMEA. Now I want to know how could I use the NMEA-data to get the highest precision of my ...
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0answers
173 views

How to apply texture on a 3D model using drone images with python? [closed]

I have generated a 3D model in .OBJ format using UAV (drone) images. But this model doesnt have texture so i want to have it textured using the original UAV images. And this should be done in python ...
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4answers
1k views

Splitting RGB image into separate bands using Drone (DJI Phantom imagery)

Previously I have made marine habitat maps using multiband imagery and remote sensing techniques (e.g blue, green and red bands from satellite imagery). I am now attempting the same process however ...
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1answer
55 views

Can I created a DEM or digital surface model with high resolution image

I have VHR imagery, 5 cm pixel, and I want to create a DEM but this image has high trees and when I take my model I cant take a real elevation because DEM is not the height of the terrain. Could I ...
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2answers
95 views

Pix4D Initial process merge looks exploded on one end

I have a 3700+ image project that has been merged from 9 separate projects. After the final merge, one end of the property looks like it exploded from the ground. If I click on the pixels they show up ...
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1answer
197 views

GrassGIS process for DTM of UAV point cloud [duplicate]

Using grassGIS I am attempting to produce a DTM (remove buildings and vegetation) from the las point cloud. Unfortunately the point cloud exported from dronedeploy.com does not distinguish first and ...
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1answer
456 views

Error: Grid layer was not correctly generated

Faced this error already several times when I was playing with processing algorithms: I used hi-res DSM/DEMs out of UAV surveys. Resolution between 2,5 - 5 cm GSD. Output format: .tif Any ideas ...
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1answer
73 views

What vertical datum for OpenDroneMap with no GCP

I am processing drone imagery with OpenDroneMap using a native Ubuntu installation of OpenDroneMap. I see the the LAS generated returns points in UTM for X and Y coordinates as stated in the ...
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0answers
168 views

Determining Bounding Points of UAV Images

I know the EXIF data from drones contains the GPS point central to the photo to provide photo location. What I'd like is to determine the lat/lon of the four corners of the image. I've done a pretty ...
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1answer
92 views

Join GPS data and video from UAV to get frames from specific locations

Is there any piece of software capable to present gps track simultaneously with video ie. google maps data and allowing to clip a frame on selected locations on track? Both data and video are from ...
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0answers
615 views

Calculate reflectance for UAV images

I have high resolution images captured by a drone using a , they are RBG and NIR images. My question is how can I calculate the reflectance for the images, the values are currently in digital numbers (...
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0answers
65 views

Deriving Topographic Information from Geotagged Photos?

I wish to extract elevation data from geotagged photos? I have worked with DEM's and the open source CLI program: GMT for my graduate studies. I own a DJI Phantom 3 and used the trial version of ...
2
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0answers
177 views

DroneDeploy generated Ortho shows skewed in QGIS (projections OK?)

I've recently bought a drone and have been having a lot of fun enhancing maps with very detailed orthomosaics. The images place correctly once loaded in QGis, absolute positioning is good enough for ...
3
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1answer
848 views

NDVI image processing

I am trying to get a NDVI image from an RGB + NIR image captured by a modified Cannon S110 camera bought from Event38 along with a 3DR Iris+ drone link The image captured with the camera looks like ...
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1answer
482 views

Importing Camera images to ArcGIS or QGIS with correct location, scale and oritentation

I have several very large image datasets from a AUV survey, essentially aerial imagery, that I need to bring into a GIS environment and have them display at the proper spatial scale, orientation and ...
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1answer
1k views

How large area can be scanned from one drone (UAV)? [closed]

How large area can be scanned from one drone if the drone doesn't move? In other words how much aerial photography data can be obtained from one drone with fixed position? I'm talking about classical ...
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0answers
71 views

Increasing performance without losing resolution when handling raster file in QGIS?

Orthomosaics generated by the processing of images obtained by UAV flights may often result in very heavy files that can take a long time to do simple tasks, just like to zoom on a specific region of ...
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0answers
72 views

Stacking/Aligning High-Res UAV Mosaics from Different Dates in QGIS?

I have two mosaics taken in different band sets respectively, on two different flights- of a crop field. The flights were taken a day apart, so the vegetation cover has not changed. The only issue is ...