Agisoft Metashape

Agisoft Metashape => General => Topic started by: Vinicius on October 31, 2015, 11:38:41 PM

Title: Relationship PIXEL SIZE and AREA
Post by: Vinicius on October 31, 2015, 11:38:41 PM

Hello,

I would like to know what is the relationship between the pixel size and calculated area (and volume too).
I think the agisoft use the information of the pixel size to calculate area and volume. But how the software know this information? Can I provide this information to the software?

Im trying to calculate area and volume of a maize crop...

Sorry to grammatical errors.

Thanks!

Title: Re: Relationship PIXEL SIZE and AREA
Post by: Wishgranter on November 01, 2015, 06:22:56 PM

search for GSD calculation ´GroundSamplingDistance, how it is calculated and etc.. 

Title: Re: Relationship PIXEL SIZE and AREA
Post by: Arie on November 02, 2015, 02:18:44 PM

Hi,
if you are trying to calculate the area and volume of a maize crop, you will need ground control points (GCPs) or at least a scale-bar in the images. The initial pointcloud from Photoscan is arbitrary i.e. it does not have a scale or position in space, therefore you cannot calculate the area/ volume without reference.
Cheers.