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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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21 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
42 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
26 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 ...
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1answer
40 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
42 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
32 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
179 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
55 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
45 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
54 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 ...
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1answer
207 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
352 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
97 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
878 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
62 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
70 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
511 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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166 views

How to calculate Flat Terrain Ground Coverage of 30° tilted photograph?

I've been looking for an eqation to find the widthxheight of ground coverage of a photo that I took with a smartphone that I attched to my drone with 30° angle to the front view and I can't seem to ...
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0answers
143 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
501 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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0answers
61 views

High resolution (house-level) tiled map imagery SAAS

I'm aiming at showing (on a web map) my visitors their house property bounds with some overlay. Thus, I'd need to find access to very high zoomed imagery, and I'd like to use Open Source and nice-...
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1answer
48 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
68 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
131 views

GrassGIS process for DTM of UAV point cloud

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
262 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
58 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
112 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
70 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
435 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
58 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 ...
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0answers
125 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
704 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
344 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
738 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
67 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
67 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 ...
5
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1answer
109 views

geo-referencing image geo-tagging,

I have images from UAV which are geo-tagged. I wish to geo-reference images which were shot in sequence, and want to create a mosaic, which further will be a small map. Is there any possible way in ...
2
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1answer
241 views

Why do UAV-derived NDVI values fall far outside -1 to 1 range after empirical line calibration?

This question was marked as being a duplicate of Landsat8 NDVI values not in the -1 to 1 range but I've posted my question because: I am not using Landsat; and there was no explanation of how to ...
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1answer
753 views

Drone that generates a point cloud from photography

I read this in a trade magazine today, ​“Esri has just released the Drone2Map for ArcGIS app, which transforms high-resolution drone imagery into ready-to-use aerial data in the GIS platform. ...
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1answer
166 views

How does the Phantom 3 4k UAV assign the coordinates/geotag to each photo?

I read that the Phantom 3 used to use a barometric reading but now it uses GPS. Does it take a new reading from the GPS/Glonass satellites every time it takes a photo or does it base every photo from ...
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2answers
364 views

Why is the altitude information of the geotag from a drone/uav/uas/rpas (Phantom 3) so innaccurate?

I have a Phantom 3 4k and on examination of the geotag information the altitude reading is often inaccurate by 10-15 metres. Why is this? Is it because the drone only has a GPS rather than a DGPS unit?...
4
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1answer
602 views

OpenDroneMap: How to produce correct georeference ortophoto from UAV?

I am trying to produce proper georeferenced ortophotomap from UAV mission using OpenDroneMap (ODM), like I have done the same thing using APS Suite from Menci In both cases I have the same images ...
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1answer
90 views

Satellite signature of reindeer carcasses

In a recent incident (august 2016) in the Norwegian mountains 322 reindeer (rangifer tarandus) were killed by lightning. The carcasses position are documented, although only by point data and not ...
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1answer
81 views

Reduce time of a drone log to a single record per second

I am trying to use the log track that come from the dji phantom, after convert into csv and being able to import in QGIS, I get a table with 10 records per second. This is beacuse it gives me one ...
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6answers
14k views

Drone aerial imagery to QGIS

I used Phantom DJI Standard 3 drone for some aerial photos of an archaeological site. When I viewed the properties of the jpeg file, it contained Longitude (like this: 22; 14; 37.701258239) and ...
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5answers
2k views

Creating photogrametric point cloud of an object from distributed photographs, here: Making accurate 3D model of building using UAV imagery?

Is there a way of creating a photogrametric point cloud from a set of densly distributed photographs of an object? Application: I am trying to investigate if creating a 3D model (point cloud) of the ...
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1answer
58 views

Can targets placed on the facades of a building be used to increase the accuracy of a point cloud of a building generated from Drone/UAV/UAS imagery?

Can targets (used for registering point clouds) mounted on a building be used to increase the accuracy of a point cloud generated from UAV imagery?
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2answers
558 views

Using “texture” image from Drone2Map for ArcGIS?

ESRI's Drone2Map beta produces various outputs; LAS, dem, hillshade, orthomosiac, etc. One of these is "Texture.jpg" file. This image is not projected but it looks like as if I should be able to ...
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2answers
484 views

Looking for real-world DJI Phantom 3 Professional sample geo-tagged images for testing

I am looking for sample DJI Phantom 3 Professional imagery for testing purposes with the Drone2Map for ArcGIS Beta software. So far I am finding the application very polished and easy to use but I am ...
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2answers
64 views

File size increases significantly after re-projecting

I have processed some aerial imagery using mapsmadeeasy.com, and georeferenced the image using the web tool within MME. However, this is not a very accurate means of georefencing, and delivers a ...