## ERDAS IMAGINE

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Occasional Contributor
Posts: 8
Registered: ‎01-15-2019

# Based on what the “FlightLine Direction” is selected given the xyzwpk table?

Based on what the “FlightLine Direction” is selected given the xyzwpk table?

For example, in ERDAS, for there are two options for horizontal and vertical. Based on what we choose these values? Is kappa angle measured with respect to azimuth?

Thank you

Jamal

Staff
Posts: 237
Registered: ‎10-21-2015

## Re: Based on what the “FlightLine Direction” is selected given the xyzwpk table?

Hello Jamal,

If you already have approximate EO parameters coming from GPS/IMU, you don’t need to run Initial Exterior Orientation Estimation to compute the relative orientation parameters. You can run APM with approximate EO parameters and then run triangulation to refine them.

Please refer to below help link for elements of exterior orientation and definition of kappa angle:

https://hexagongeospatial.fluidtopics.net/reader/uOKHREQkd_XR9iPo9Y_Ijw/EIr0FMakFYK1Y8QvRkKL1w

And check below link for image orientation. Right+X means the photo-coordinate system is parallel to image orientation, in Down+X case image is rotated 90 degrees, in Left+X case it is rotated 180 degrees, and in Up+X case it is rotated 270 degrees relative to the photo-coordinate system. In order to get a solution, you have to select correct image orientation or enter correct kappa values to reflect image orientations. For example, adding 90 degrees to kappa values is the same as changing image orientation from Right+X to Down+X.

https://hexagongeospatial.fluidtopics.net/reader/~P7L4c0T_d3papuwS98oGQ/RDQ5RGIPLvIWQlnRFTmL7g

Also, please check the below help page for Horizontal flight path for W-E images and vertical flight path N-S images to collect cross-strip images.

https://hexagongeospatial.fluidtopics.net/reader/~P7L4c0T_d3papuwS98oGQ/qFk9Wss9a2WCyDHkkh85MA

Best Regards,

Yasemin

Occasional Contributor
Posts: 8
Registered: ‎01-15-2019

## Re: Based on what the “FlightLine Direction” is selected given the xyzwpk table?

Thank you for the useful input Yasemin.

I couldn’t figure out how kappa (which represents the flight direction) is recorded by the IMU device. Does the IMU measure the angle between the W-E as shown in the screenshot below?

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