# Tagged Questions

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

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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 ...
1k views

### 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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### 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 ...
3k views

### 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 ...
189 views

### 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 ...
303 views

### 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 ...
766 views

### 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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### 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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### 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 ...
977 views

### 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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### Using Phantom 3 Pro to capture aerial imagery for small site plans and derive DEM?

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 ...
566 views

### 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 ...
3k views

### 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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### Photogrametry using e-Foto (Stereo Plotter, Stereo Imagery, Stereoscopy)

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 ...
129 views

### 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 ...
131 views

### 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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### 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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### 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 ...
156 views

### 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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### 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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### Stereoscopy Software

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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### 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 ...
1k views

### Is there an alternative for ERDAS IMAGINE AutoSync (eventuelly for QuantumGis)?

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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### 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. ...
117 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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### 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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### 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 thanks to the "formula" menu... in vain. I did not find a ...
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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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### 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 ...
359 views

### 3D roof polygon creation from polylines in ARCGIS 10.1

I am Working in arcgis 10.1,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 Building Generator Tool",...
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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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### 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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### 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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### Calculating fiducial marks?

I'm working on a photogrammetric project. For the interior orientation, i have to calculate fiducial marks a,b,c and d from my input information : distance in mm between AB, BC, CD...and also the ...
60 views

### 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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### Automatic tie point measurement generate wrong placed tie points

I couldn’t figure out why the Erdas 2015 generates a wrong placed tie points when I use Automatic tie point generation measurement, have a look at the below example.
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### Error : LayerRasterRead failed : Imagine Photogrammetry

I'm using Imagine Photogrammetry ( ERDAS ) and I would like to generate a Data Elevation Model DEM based on PLEIADES imagery. When I execute erdas , it seems like he is computing the DEM but after ...
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### erdas LPS : Load Z values from a DEM?

I'm working on a photogrametric project with erdas LPS version 2013. I succeed in taking several ground control points (x and y values). However, i can't extract and load Z values from my raster DEM ...
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### Apply mask on ERDAS LPS

I am currently working on my final year dissertation and most of it is done on LPS. I am using Cartosat-1 and ALOS PRISM imagery to create DTMs for an area that is located on a peninsula. The problem ...
159 views

### 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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### LiDAR data for Palawan (Philippines)

Is there any public or private sources of LIDAR data for San Paul river in Palawan (Philippines)? Searching online has not lead me to any sources, and I am unsure how the commercial world of LIDAR ...
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### Is there an accepted model of refraction affects on aerial photography

As I understand it the changes in atmospheric density as light moves through the atmosphere causes the light to bend. That means that if you are trying to calculate the location of a point on the ...
277 views

### 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 ...