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7/24/2019 PhotoScan Tutorial
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PhotoScan Tutorial
Add photos
To add photos select the Add Photos, command from Workflow menu or click
Add Photos button on Workspace toolbar. In the Add Photos dialog browse the source folder
and select files to be processed. Click Open button.
Align photos
At this stage PhotoScan refines the camera position for each photo and builds the point
cloud model.
SelectAlign Photoscommand from the Workflow menu.
Set the following recommended alues for the parameters in theAlign Photosdialog!
Accurac"
High
Pair preselection
Ground control
Constrain features b" mask
Disabled
Click O# button to start photo alignment.
Place markers
$arkers are used to optimi%e camera positions and orientation data, which allows for
better model reconstruction results, and for precise georeferencing.
To generate &ualit" orthophoto at least '( ground control points )*CP+ should be
marked eenl" within the area to be processed.
To be able to follow guided marker placement approach )that would be faster and
easier+ "ou need to reconstruct geometr" first. SelectBuild Geometry,command from
the Workflow menuand specif" following parameters in theBuild Geometrydialog!
Click O#.
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Then, when the geometr" is built )it usuall" takes a few seconds+, open a photo where a *CP
is isible inPhoto Viewdoubleclicking on its icon in the Workspacepane.
Switch to marker editing mode using dit !arkerstoolbar button. -oom in to locate the
*CP on the photo and place a marker in the corresponding point of the image using "reate
!arkercommand from the photo contet menu aailable on rightclick on the opened photo
in the corresponding position!
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Select the marker on the Ground "ontrolpane. Then filter images inPhotopane using
#ilter by !arkersPhotopane toolbar button.
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/ow "ou need to check the marker location on eer" related photo and refine its position if
necessar" to proide maimum accurac". Open each photo where the created marker is
isible. -oom in and drag the marker to the correct location using the mouse in the dit
!arkersmode.
0epeat the described step for eer" *CP.
Input marker coordinates
$arker coordinates should be imported from a file. Click Import button on the Ground"ontrolpane toolbar and select file containing *CP coordinates data in the Open dialog. The
easiest wa" is to load simple characterseparated file )1.tt+ that contain markers name, , "
coordinates and height.
In$mport "%Vdialog indicate the delimiter according to the structure of the file and select the
row to start loading from. /ote that 2 character indicates a commented line that is not
counted while numbering the rows. Indicate for the program what parameter is specified in
each column through setting correct column numbers in the Columns section of the dialog.
Check "our settings in the sample data field in$mport "%Vdialog!
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Click O# button. The data will be loaded into the Ground "ontrolpane.Then click on the %ettingsbutton in the Ground "ontrolpane and in the Ground
"ontrol%ettingsdialog select corresponding coordinate s"stem from the list according to the
*CP coordinates data.
Set the following alues for the parameters in!easurement accuracysection!
Camera accurac"
&'
$arker accurac"
'(''&
Scale bar accurac"
'(&
Pro3ection accurac"'(&
Tie point accurac"
)
Click O#.
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Optimize photo alignment
To achiee higher accurac" in calculating camera eternal and internal parameters and to
correct possible distortion )e.g. 4bowl effect5, etc.+ optimi%ation procedure should be run.
This step is especiall" recommended if the ground control point coordinates are known
almost precisel" )seeral centimeters accurac"+.
On the Ground "ontrolpane uncheck all photos and check the markers to be used in
optimi%ation procedure. The rest of the markers that are not taken into account can sere as
control points to ealuate the optimi%ation results.
Click *ptimi+ebutton on the Ground "ontrolpane toolbar.
Select all camera parameters. Click O# button to start optimi%ation process.
Set bounding boxThis step is optional since PhotoScan automaticall" calculates bounding bo dimensions and
location. It is recommended, howeer, to check if an" correction is needed as geometr"
reconstruction procedure is applied onl" to the area inside the bounding bo and odd points
eclusion ma" speed up the process.
6ounding bo is resi%able and rotatable with the help of esi+e egionand otate
egiontools from the -oolbar.
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Important:-he red.colored side of the bounding bo/ indicates the plane that would be
treated as ground plane and has to be set under the model(
Build geometry
78 model reconstruction is a computationall" intensie operation, it can take a long time,
depending on the &uantit" and resolution of loaded photos and selected target &ualit".
SelectBuild Geometrycommand from the Workflow menu.
Set the following recommended alues for the parameters in theBuild Geometrydialog!
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Ob3ect t"pe
Height field
*eometr" t"pe!
%mooth
Target &ualit"
!edium9ace count
0''''''
9ilter threshold!
'
Click O# button to start building geometr".
Generate orthophoto
Select/port *rthophoto .1 /port 2PG3-$##3P4Gcommand from#ile menu.
Set the following recommended alues for the parameters in the/port *rthophotodialog!
Pro3ection t"pe
Geographic
Pro3ection
b" default the pro3ection set in the *round Control Settings is used6lending mode
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!osaic
9ill holes
nabled
Piel si%e
Default 5alue )maimum effectie resolution is shown b" default+
Split in blocksDisabled
Setup boundaries
8isabled
Click/port(((button and then specif" target file name and select t"pe of the eported file
)e.g. *eoTI99+. Click Sae button to start orthophoto generation.
Generate D!
Select/port D!command from#ile menu.
Set the following recommended alues for the parameters in the/port D!dialog!
Pro3ection t"pe
Geographic
Pro3ection
b" default the pro3ection set in the *round Control Settings is used
Crop inalid 8:$
nabled
/odata alueDefault 5alue
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Piel si%e
Default 5alue
Split in blocks
Disabled
Setup boundaries
DisabledClick/port(((button and then specif" target file name and select t"pe of the eported file
)e.g. *eoTI99+. Click Sae button to start 8:$ generation.
In"ormation#;ou can use the following datasets for data processing practice with Agisoft
PhotoScan Pro!