Questions tagged [photogrammetry]
The practice of determining the geometric properties of objects from photographic images.
96 questions
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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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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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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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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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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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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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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 ...
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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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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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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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Creating vector datasets from 3D models
I'm an archaeologist and have been using photogrammetry to record rock art sites in northern Australia. That is working very well (we're using Agisoft Photoscan, it's fantastic).
My question relates ...
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Georeferencing an oblique angle photograph in repeat-photograph studies
Backround: Aerial photography and remote sensing can be used to measure current land cover and recent land use change. However, these technologies are fairly recent and therefore time series are ...
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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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Setting elevation data for tie points in Pix4D
I am currently working in Pix4D and am trying to assign elevation data to my selected tie points. I have aerial images taken using a camera with GPS from an aircraft and am working with a fairly ...
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How Does Erdas calculates the ground coordinates for each pixel in the image
How Does Erdas calculates the ground coordinates for each pixel in the image
I have a conceptual question regarding photogrammetry, what is the formula used by Erdas to find the (X,Y,Z) on ground. ...
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Erdas LPS : how to rename points_ID values?
I'm working with ERDAS LPS 2014, i would like edit the name given for my GCPs and TPs (add the following suffix : "_w").
I tried to do that using the "formula" menu... in vain. I did not find a ...
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Existence of fiducials marks in a digital camera file
Existence of fiducials marks in a digital camera file
I have created a generic digital camera file using Erdas 2015 with the following data in it:
LPS Camera File Version: 2.0
Camera Name: "generic ...
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ArcGIS Pro crashes when importing photogrammetric multipatch? [closed]
I am new to the ArcGIS platform, so please bear with me.
I have run some tests on both ArcScene and ArcGIS Pro before my jobs decides with program to buy.
ArcScene imports 3d models exported from ...
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Deriving equations of Epipolar lines for linear array scanners? [closed]
I'm going to obtain the equations of the Epipolar lines of a given image captured with linear array scanners. There are some papers addressed this subject, but they haven't stated key points in detail,...
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Rigorous geometrical models for InSAR imagery?
I'm looking for rigorous geometrical models for InSAR imagery. I'm familiar with the rigorous models for SAR images, but I don't know the model for InSAR. I searched through the internet, but I didn't ...
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UAVs and using ground control
I have been having a conversation at the office about whether to use ground control when using drones/UAVs to capture aerial images. The ground control that I am referring too is any permanent survey ...
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Using Phantom 3 Pro to capture aerial imagery for small site plans and derive DEM? [closed]
I am curious if this consumer UAV can be used to capture imagery for further processing to stitch seamless imagery and to use as input into stereo/photogrametry software to create reasonably accurate ...
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Open source software for 3 D vector editing on top of stereo images
I am looking for an open source software that could be used to digitize 3D vector objects from a stereo pair of remotely sensed images. Photogrammetry softwares are too expensive for my use (giving an ...
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Automatically adding Z-values from a DEM to an already created polygon
We have excavated a very large 5.000 year old fish fence, which was documented by photogrammetry, and is now being digitized. I started digitizing the orthophoto in QGIS and everything is cool. Now I'...
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latitude longitude into corresponding location in a image [closed]
I have an image , some data on this image, some data on the camera that took that image and a piece of code.
And i'm trying to find the location (Px,Py) in the image from (lat,lon).
my problem is ...
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Real-world dimensions of a 3D object in VisualSFM or MeshLab
I have a good-quality, precise 3D scene reconstructed from photographs/video by VisualSFM. All camera parameters, including 3D position and lens details, are known.
Now, that the hardest work has ...
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Aerial photogrammetry book with all the math
Can anyone recommend a book that hits all the math for the general situation of doing serious photogrammetry calculations on aerial photographs?
Particularly an inexpensive book or one I can get ...
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Orthorectification errors in ArcMap when including RPC data
I am trying to orthorectify satellite imagery with a DEM in ArcMap. I have already georeferenced the raster.
The imagery came with an RPC TXT file, but when I change the name of the RPC file to match ...
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Software for image orientation (aerial triangulation)
I'm trying find a software which can orient an UAV Imagery using GCPs (Ground control points in UTM Coordinates system) and Camera calibration (only camera focal length, p1,p2, k0, k1, k2, k3 and ...
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Stereoscopy Software [closed]
I'm learning the Manual Photogrammetry process, Stereoscopy, to Process UAV Imagery.
I'd like to know about others software, especially open source or low cost.
ERDAS Imagine, Erdas Extensions for ...
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Photogrametry using e-Foto (Stereo Plotter, Stereo Imagery, Stereoscopy) [closed]
I'm learning Photogrametry with Stereo-view using e-Foto (http://www.efoto.eng.uerj.br/en). At the end, I want to know how to do Photogrametry via Stereoscopy in PC with Anaglyph Glasses.
I could ...
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Stereo Analyst & ArcGIS 10.1 - volume calculation
I use to perform analysis and imagery exploitation with the software above.
I have created a Stereo Analyst report with some 3d polygon by a stereoscopic block.
How do I calculate the volume of some ...
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Star Markers - unable to get tie points in Inpho Match-AT
What do the star markers mean in Trimble's Inpho Match-AT software, specifically in the multi-photo measurement feature?
I have been unable to generate tie points in an aerial triangulation in photos ...
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Looking for an "introduction to photogrammetry" book with a well documented chapter on UAV
I would like to recommend a book for my students to learn the basis of photogrammetry. I've read "Introduction to modern photogrammetry", 2001, from Mikhaïl, Bethel and McGlone. Unfortunately, the ...
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Seeking alternative for ERDAS IMAGINE AutoSync?
I had the possibility to work with a Demo-Version of the ERDAS IMAGINE module AutoSync.
I have different geo-rasters (i.e. geoTIFFs) produced by UAV photography and which have to be matched the best ...
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Create DEM from cartosat stereo pairs?
I have two carstosat stereo pair images. All i need to do is to extract DEM from those.
So, i tried it doing with OSGeo4W. but i didn't succeeded in it.
So IS there any other softwares or opensource ...
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Direct Georeferencing with X,Y,Z and Omega, Phi, Kappa
I have images taken from plane, it's longitude, latitude, elevation, omega, phi, kappa. I suppose that earth is flat (I don't need any DEM on that stage) and I want to calculate how image is nailed to ...
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3D roof polygon creation from polylines in ArcGIS for Desktop?
I am Working in ArcGIS 10.1 for Desktop, and I would like to create roof polygons from lines, the lines are captured with photogrammetry technique.
As per my requirement I have found tool "3D ...
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DEM generation from ASTER L1B imagery using FOSS
Is there any (photogrammetric or other) FOSS package to support the generation of a DEM from ASTER L1B products (i.e. combining the spectral bands 3N and 3B)? Are there any practical examples or/and ...
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Aerial Photograph Footprint Size Calculation
I was wondering what an easy formula to calculate the dimensions of the ground covered by an aerial photograph.
I know the following:
camera sensor size (mm x mm)
camera focal length (mm)
height ...
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QGIS, point clouds and photogrammetry
I'm trying to use photogrammetry and Structure from Motion to record buildings, and I'm looking for a way to bring these into a format usable in GIS, in particular pointclouds and models of terrain, ...
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Which Software can derive building footprints from imagery?
I'm looking for a software solution that can process large areas of imagery to produce building footprints.
For the area of interest, I can source either satellite stereo pairs or oblique imagery. I ...
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3D photography visualisation and data acquisition
Couple of years back, i remember seeing a demo on web from Microsoft (i think it was) which showed a web application which was displaying what i would describe as a "cloud" of terrestrial survey ...
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What Open Source (command line/API) method is there to orthorectify and georeference an aerial image given telemetry data?
How can I take an image and orthorectify it automatically with open source software?
The information associated with each image is:
camera specs
latitude, longitude, elevation of the camera
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