Agisoft Metashape

Agisoft Metashape => General => Topic started by: fpbv on December 10, 2012, 06:04:30 PM

Title: Forestry volume for mass timber.
Post by: fpbv on December 10, 2012, 06:04:30 PM

Hi guys

Let?s see if you can help me.

I have a lot of customers that want the forestry volume to calculate the mass timber.
I did to a single plot in PS and worked fine.
But my customers need this to more than a hundred plots. So, to do this in PS is painful.
Is there another way to this in PS and/or ArcGIS or other GIS package?
I thought to crop all the DEM using a multi poligon shapefile, but in ArcGIS you need a reference plane above or below, so didn?t work because it put more extra volume.

Anyone could help on this??

Title: Re: Forestry volume for mass timber.
Post by: George on December 11, 2012, 01:18:58 PM

Hi, Fabricio,
the question is how you define the reference plane i.e. the zero level for the forest basement. Do you have a sort of DTM to be placed under your DSM/DEM?
GR

Title: Re: Forestry volume for mass timber.
Post by: fpbv on December 11, 2012, 02:58:08 PM

Hi George

Thanks for your reply.

That is another big problem, because I don?t have any DTM...

Title: Re: Forestry volume for mass timber.
Post by: George on December 11, 2012, 07:33:07 PM

what kind of accuracy/precision your customer demands?

Title: Re: Forestry volume for mass timber.
Post by: fpbv on December 11, 2012, 08:52:49 PM

As high as possible.

We flew a test area with 10 cm GSD.

Title: Re: Forestry volume for mass timber.
Post by: George on December 12, 2012, 05:14:47 PM

I assume that then you may postprocess your imagery based on precisely measured GCPs. So that a DEM is extremely precise in terms of XYZ values. If you have a good Z value than it seems like there is no real problem to anaylise it. Is it true for your case?
Could you share a model and imagery of yours, please?