Questions tagged [photogrammetry]

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

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19 views

Extract the Lat and Long for geo tagged UAV images [closed]

I have a stream of drone images from DJI drone flowing in to an application. I have the below geo tagged information {'GPSVersionID': b'\x02\x03\x00\x00', 'GPSLatitudeRef': 'N', 'GPSLatitude': (38.0, ...
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Adding co-registered old aerial photos to DAT/EM Summit Evolution

I am trying to figure it out how to use Datem's DAT/EM Summit Evolution. Is there a way for me to add the co- registered old aerial photos to that software? I'd like to see if it could match up in a ...
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16 views

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 ...
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44 views

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 ...
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45 views

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 ...
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45 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
392 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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2answers
39 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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21 views

Is Bundle adjustment a registration process?

Since Image registration is the process of precisely overlaying two (or more) images of the same area through geometrically aligning common features (or control points) identified in the images, can ...
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45 views

Merging FBX tiles in a single model file

I would like to obtain a single FBX file for a 3D photomesh, with texture. As the original scene is quite large, I use Bentley ContextCapture Master to generate tiles (a dozen), each being in FBX ...
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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 ...
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50 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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309 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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88 views

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. ...
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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 ...
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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 ...
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1answer
127 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 ...
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148 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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1answer
258 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 ...
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99 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 ...
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1answer
119 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 ...
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59 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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1answer
71 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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48 views

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
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1answer
1k 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 ...
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591 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 ...
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210 views

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 ...
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91 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 ...
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50 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 ...
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1answer
92 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 ...
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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 ...
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1answer
275 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 ...
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1answer
62 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 ...
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1answer
325 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....
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1answer
487 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 ...
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1answer
204 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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98 views

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 ...
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1answer
780 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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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
130 views

Aerial Triangulation by using GPS height

Is it possible to use GPS geographic coordinates & ellipsoidal height not orthometric heights in Aerial Triangulation?
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1answer
368 views

Which type of point cloud is more accurate: from airborne LiDAR or aerial photos?

I have been offered two types of point cloud for my 3D Project. The data will be used by the environmental agency in various projects e.g. flood-risk analysis, dyke conservation, and nature ...
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2answers
305 views

Getting a flat surface from DSM for height calculation?

I have a DSM done trough photogrammetry with the software Agisoft Photoscan of a forestry experiment and I need to accomplish an analysis of the mean height from it. My problem is that the profile has ...
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3answers
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How many forest clear cuts and how big are they?

I have forest stand characteristic data from northern Sweden. We have interpreted multiple years of aerial photos and now have polygons outlining different forest stand ages over time (e.g. clear cuts,...
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Pixel values in a mosaic with TIFF images in Photoscan? [closed]

I´m trying to understand how works the creation of a mosaic in photoscan or in other photogrammetry software. When I use various TIFF images with information in their pixels (in my case temperatures) ...
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195 views

Counting treetops from the DSM [duplicate]

I want to measure tree heights in the forest using drone photogrammetry. So far it's easy to measure single trees height using fugroviewer in the pointcloud, but I would really like to measure whole ...
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Cropping Oblique Photos to Geographic Feature

Let me preface this by stating that I know I'm in the GIS neighborhood and I'm asking a code heavy question, but my hiccup here isn't the programming - it's the GIS and associated math. I am writing ...
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1answer
202 views

Dependence of point cloud data on camera parameters? [closed]

I want to do a 3d-reconstruction of a road surface using 'Structure from motion'. After taking the required image set of the road surface, I want to obtain the point cloud data using some open source ...
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1answer
1k views

gdal_merge.py with memory constraints

I export bunch of DEM files (10000x5000) from Photoscan and I need to combine them with gdal_merge.py but the problem is that it consumes all the memory availible and can't finish processing. What ...
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1answer
1k 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 with ...