# Forum

### Author Topic: Build Orthomosaic - Projection plane with markers  (Read 5773 times)

#### Meric

• Newbie
• Posts: 3
##### Build Orthomosaic - Projection plane with markers
« on: July 14, 2020, 08:34:21 PM »
Hello,

I'm making a Python script to build orthophotos.

I'm looking for the following function (screenshots below) :

- projection plane: marker (e.g. hor points 1_origine - 1_hz; vert points 1_origine - 1_verti)

I don't know how to apply this function in my script...

My model is referenced in the EPSG:2056 system.

#### Alexey Pasumansky

• Agisoft Technical Support
• Hero Member
• Posts: 14843
##### Re: Build Orthomosaic - Projection plane with markers
« Reply #1 on: August 09, 2020, 01:43:08 AM »
Hello Meric,

You can check the following thread for additional information regarding the projection plane definition (as a matrix) based on the points' coordinates (for example, markers):
https://www.agisoft.com/forum/index.php?topic=3996.msg50148#msg50148

Best regards,
Alexey Pasumansky,
Agisoft LLC

#### mcstieg

• Jr. Member
• Posts: 88
##### Re: Build Orthomosaic - Projection plane with markers
« Reply #2 on: August 24, 2020, 04:02:00 PM »
Hello Alexey,

I'm still wondering how the ortho size can be calculated as it is done in GUI (attachment).
Can you please give advice on how to calculate the value m/px and the estimated total size in px?

The python value is Orthomosaic.resolution

Thank you!

#### mcstieg

• Jr. Member
• Posts: 88
##### Re: Build Orthomosaic - Projection plane with markers
« Reply #3 on: August 25, 2020, 02:20:44 PM »
I have been able to calculate the model dimensions in x and y plane by looking through all the model vertices.
But the next step must have to do with some camera parameters. Please help with the calculation of the expected ortho dimensions (see post above).

Thank you!

#### Jordan Pierce

• Newbie
• Posts: 23
##### Re: Build Orthomosaic - Projection plane with markers
« Reply #4 on: October 24, 2023, 11:56:13 PM »
For future reference, if someone is looking for orthomosaic resolution calculated automatically, you can read it from the report: it's calculated and written there. You just need to scrape the resolution value using a PDF scraper