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Questions tagged [photogrammetry]

The practice of determining the geometric properties of objects from photographic images.

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Photogrammetry File Format

We are talking to a private contractor about shooting LiDAR and photogrammetery on our land. We want the 3D data to come in slpk format, but the contractor says they do not know what that is and that ...
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Generating orthomosaic from DEM in Metashape

I'm using Metashape to make a point cloud from georeferenced drone images using the basic workflow (Align photos -> Build Point Cloud). I then export that and align it to a LiDAR cloud we have from ...
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Get Lat,Lon,Elevation, and IMU data for DSLR camera

I am looking for a way to take images from an airplane window, and record lat/lon/elevation and camera roll,pitch,yaw to image exif data. The purpose for this is to project detected objects in an ...
Franklyn Dunbar's user avatar
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Changing saved reflectance panel values in Pix4D [closed]

We have a Micasense rig for multispectral imagery, and when my coworker set up my Pix4D account & did a test run he used the wrong reflectance values for our calibration panel. Pix4D saves those ...
DataWrangler's user avatar
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Merging Multiple 3D Point Clouds, Reducing Misalignment and Correcting Unusual Height

I've been trying to merge two point clouds into a single uniform point cloud using the Python package pyvista. However, I have encountered an issue that the misalignment between these two point clouds ...
Lion Lai's user avatar
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Drone photogrammetry - power lines not lining up

We're using a DJI P1 processed in Metashape to create orthophotos. We're having problems with power lines being disconnected. Fences and other long, straight objects that are on the ground are all ...
GlenS's user avatar
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Couldn't find coordinate system NRW Netz zone 2 in Metashape

I have photogrammetry data from Germany, I got information of the coordinate system used in this project for Ground Control Point (GCP) is NRW Netz77 zone 2. I couldn't find anything on epsg.io or ...
Tegar PS's user avatar
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Orthophoto showing image banding along flight lines after reconstruction

I'm currently flying a mapping mission with a DJI P1 with the following flight parameters: Altitude: 250m Side/Forward Overlap: 60/80 Terrain Follow: Enabled RTK: Enabled Regardless of the time of day ...
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Problem with wrong DEM output after georeferencing

My goal is to georeference a DEM tiff file that I have with a reference orthophoto. Steps to reproduce Open orthophoto (EPSG2056) in QGIS Open the DEM (EPSG2056) in the Georeferencer Add GCP (I am ...
tukanium's user avatar
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How do LiDAR and photogrammetry DTMs differ?

Recently, I received two temporally distinct DTMs of a particular area processed with photogrammetry. The datasets were acquired about one year apart and no landscaping activity occurred at the site ...
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Determine Lat/Long of "off-center" point of a top-down image

I am a computer science student with a top down photo taken by a drone. This drone has relatively low to zero gimble yaw/pitch (0-10deg), isn't very high up (~15m) in flat lands pretty close to sea ...
slightly drifting's user avatar
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Does LiDAR tend to georeference better than photogrammetry?

I noticed whenever I get a photogrammetry dataset, the products (like DTM, DSM) are always misaligned from satellite imagery of the same area by a few metres. Today I received a LiDAR dataset and they ...
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Including height information when exporting images from SlantView 2

I have a set of images that were collected with a slantrange multispectral sensor (S3P). To include the radiometric calibration information from the sensor, I use SlantView 2 (Ver. 2.17.4). I will ...
Jose Luis Landivar S's user avatar
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Options for making a DEM of single-return point cloud?

I have a project site surveyed with single return photogrammetry so, all points are unclassified. It was not a problem to create a DSM of this data, but I also need a DTM. What are my options? Will I ...
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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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Accuracy of key points for moving subjects

I am currently working on a project where I have a fast-moving subject (a tree) which I capture from multiple angles using multiple cameras. My intention is to use photogrammetry to create a 3D model ...
vatbub's user avatar
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DEM generation using Agisoft Metashape Professional

Currently, I am processing Aerial photographs acquired in 1967 and 1984 (all are acquired by frame camera) using Agisoft Metashape Professional software. What I faced is; the DEM generated from 1967 ...
Alima Abdella Dawud's user avatar
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1 answer
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Measure an angle on an orthophoto or on a dense cloud

I'm currently working on QGIS 3..10.1, and I would to analyse my roof with UAV analysis. I have already made a dense cloud, an orthophoto and a DEM on agisoft metashape but now I would make few ...
Antonin's user avatar
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3 votes
1 answer
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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 ...
John Jewell's user avatar
1 vote
2 answers
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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.
Jolly-culture97's user avatar
13 votes
1 answer
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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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Extract terrain coordinates as seen from a viewpoint + FoV in a digital globe

Context Every one working with photogrammetry or 3D knows what a depth image is. For example OpenCV defines a "depth map" from a stereo pair, e.g.: where the darker a pixel is, the greater ...
swiss_knight's user avatar
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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 ...
Auberron's user avatar
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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 ...
hillsonghimire's user avatar
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Standard(s) to store and share geolocation and 3D orientation data for an object, e.g. a raster

As an example, GeoTIFF is a great standard to embed geolocation data into a raster file for cartographic purposes. But in that case, raster files are usually supposed to be on the projection plane. ...
swiss_knight's user avatar
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2 votes
1 answer
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DEM from overlap monocular images Pleiades

I am trying to create a DEM from 4 overlap monocular satellite images of different dates from Pleiades using UP42.com. But I could find only information about stereo images processing. Is it even ...
Marina Kolpakova's user avatar
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5k views

Importing .obj-file in QGIS 3.10.5

I wonder if it is possible to simply import .obj and .jpg (texture) files in QGIS and implement them in an existing map. I found this answer QGIS, point clouds and photogrammetry but it isn´t exactly ...
wild5four's user avatar
1 vote
1 answer
165 views

Photo has bright and darker on an aerial photo question

For those that work in photogrammetry world, my question is how can I correct this old aerial photo that needed to be correct from a darker and bright black and white. I would have like to have both ...
PROBERT's user avatar
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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, ...
Vladimir Sviridov's user avatar
1 vote
1 answer
502 views

Point Residual in photogrammetry

I have been working on old aerial photos on Agisoft Metashape and there is a button that company added this called the "show" point residuals. When you turn it on, it shows where the line shows. I ...
PROBERT's user avatar
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1 vote
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390 views

DSM results from WebODM are not correct [closed]

I am new to WebODM and I am trying to generate DSM and Orthomosaic images using default settings in WebODM. The Orthomosaic image is correct by providing GCP but the DSM file is having inaccurate ...
Shubham Tiwari's user avatar
1 vote
1 answer
215 views

How to transform camera calibration parameters to other coordinate system?

I have all camera calibration parameters (X0, Y0, focal length, R0, P0, P1, K0, K1, coarse rotation, rotation, translation) and position of the image in WGS84 (XYZ in meters) and other parameters like ...
Raffallo's user avatar
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2 answers
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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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3 votes
1 answer
236 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 ...
Dean's user avatar
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CSF Filter for creating Bare Earth Model use in Agisoft

Can anybody tell, how to use CSF filter Plugin(Cloud Compare) in Agisoft. I am having Agisoft Metashape Professional
Kaichand03's user avatar
5 votes
1 answer
3k views

CHM (Canopy height model) = DSM (Digital surface model) - DTM (Digital terrain model)

I want to create a canopy height model (CHM) which has the height of objects (trees, building, etc.) from DSM and DTM. Below is the step by step procedures which I did so far. I use open source s2p ...
Lion Lai's user avatar
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1 vote
0 answers
907 views

Conversion of Fbx or Obj to Cesium Tiling [closed]

I have a an OBJ File and a FBX File of very large size (OBJ = 25GB & FBX = 6GB) I'm looking for a way to convert either of them into Cesium Tile Format. I have tried using Pix4D software which is ...
RMT's user avatar
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3 votes
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Extract water areas from aerial photogrammetry DEM in QGIS

We are working with peatland restoration sites providing aerial photogrammetry of the restoration progress. We want to differentiate between areas water and bare peat which can look very similar in ...
RoryG's user avatar
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1 vote
1 answer
134 views

Generating DEM Generation in LPS?

I have a Cartosat 2.5 m Imagery and Block files along with DSM Data. I wanted to generate DEM using Leica Photogrammetry Suite Software. Does anyone know the steps of generating same? I have to edit ...
GISKeeda's user avatar
1 vote
0 answers
107 views

Object height determination through Split Stereo image visualization QGIS

Is there any way to display (Aero-triangulated) left and right images (Stereo photogrammetry) in 2 mapview/viewport(different viewport/Map View/Multiple Canvas) in QGIS. So that we can use Sensor ...
Kaichand03's user avatar
0 votes
1 answer
187 views

Focal length vs Principal point

I have set of areal imagery. One of a parameters I get with images is camera's Principal Distance , what I'm looking for is Focal length, but I don't have Focal length at the moment I tried to ...
Toren's user avatar
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1 vote
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Automatically Recognised Targets for Combined Laser Scanning and Photogrammetry

I'm currently performing an engineering honours thesis on terrestrial photogrammetry and laser scanning in Archaeology. Both methods will be used to document a single location first and analysis will ...
William Andrews's user avatar
1 vote
1 answer
474 views

PDAL error: "Couldn't create filter stage of type 'filters.cpd'"

I would like to use the cpd filter to transform a point cloud, but I am heading to the following error: RuntimeError: Couldn't create filter stage of type 'filters.cpd' which comes from the ...
Simon's user avatar
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0 votes
1 answer
137 views

Interpolation of holes resulting from DTM groundfiltering of SfM pointcloud

I am wondering if there is an efficient interpolation method to close the holes in a dtm resulting from groundfiltering. At the moment I am directly interpolating the point cloud to a raster using ...
user97744's user avatar
3 votes
1 answer
469 views

Building height calculation from stereo Satellite images (Satellite Azimuth and Satellite Elevation)

Can anybody help me in how to calculate building height from stereo satellite images sensor metadata (Mean satellite Azimuth and Mean Satellite Elevation) Stereo Satellite Images Azimuth's (335....
Kaichand03's user avatar
5 votes
1 answer
625 views

DSM quality lower in ArcGIS Pro than PhotoScan

I am processing aerial photos collected with an automated drone flight into orthomosaics and DSMs, and have noticed the quality of outputs produced in PhotoScan is much higher than those produced in ...
lambertj's user avatar
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0 votes
1 answer
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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 ...
lambertj's user avatar
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2 votes
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GDAL : transfer metainformation

I'm using Agisoft Photoscan 1.4.2 to build DEM from UAV photos and in last versions thay produce DEM multipage tiff format and I want to convert it to tiff with metainformation preserved. According ...
mrgloom's user avatar
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1 vote
1 answer
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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 ...
lambertj's user avatar
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4 votes
2 answers
6k 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. ...
Devdatta Tengshe's user avatar