[GRASS-user] GRASS GIS in Archaeology: how to get a cross section

GRASS GRASS user
1

Hi everyone,

(attachments)

gall0302lrg.jpg
original_model.jpg

···

Let me share some doubts and concerns regarding to a concrete application of GRASS GIS to archaeology.

The point is that I would like to prepare some training exercises for a group of archaeologists, and I’m dealing right now with the problem of how to properly represent stratigraphic sections or cross sections over an excavation site. I mean something like this:

stratigraphy

For the training exercises, I could own a collection or a series of digital surface models (dsm), relative to every single step or excavation phase on the excavation’s site process. In a practical way, that means that every time a stratum is removed, the archaeologists can get a new digital surface model using a drone and a lidar sensor. Then computing the difference between the previous dsm and the current one (and so on, successively), they could obtain a collection of stratum or layers to visualize it in a cross section diagram. I don’t know if the problem is enough well explained…

I’ve been reading and searching on the Internet for a while, about GRASS GIS and stratigraphic/cross sections, but I’ve didn’t find any hint neither a clear clue about how to do it. So, the question is, is it possible to get something similar to the previous or the following image using GRASS GIS, as well as combined, with other tools or open source software? Any answer, hint or clue will be really appreciated.

model

Thanks,
Lluís

-- 
Lluís Vicens
Servei de Sistemes d'Informació Geogràfica
--
Universitat de Girona
--
Pl. Ferrater Mora 1
17071   Girona
Tel +34 972 418 039 (7025 intern)
[lluis.vicens@udg.edu](mailto:lluis.vicens@udg.edu)

Lloc web: [http://www.sigte.udg.edu](http://www.sigte.udg.edu)
Twitter: [http://twitter.com/SIGTE_UdG](http://twitter.com/SIGTE_UdG)
2

On Mon, 12 Nov 2018, Lluís Vicens wrote:

For the training exercises, I could own a collection or a series of
digital surface models (dsm), relative to every single step or excavation
phase on the excavation's site process.

Lluís,

   Your description looks similar to what mining geologists do to provide an
estimate of ore by grade and location; a 3D model of the ore body based on
core (or bulk) samples.

   A less expensive approach than using a LiDAR-equiped drone would be to
take depth measurements at points on a defined grid and use geostatistical
models to interpoate between unmeasured points. If you need to only map
strata, grass has capabilities for producing 3D models of geology but I've
not used them because I'm not a geologist.

   Something to consider while others provide more explicit ideas.

Regards,

Rich

3

Hi Lluis,

a real 3d GIS for Archaeology is not available at the Moment. You may try
to create some 3d Volumes in Grassgis but your students will hate it !

I have also been Looking for a solution to this (I am archaeologist
myself). But for now I stay with CloudCompare in 3d!!! Sadly CloudCompare
has no Attributetable connected to Features and Stylingoptions as you may
have enjoyed in Qgis. So unfold some section from your 3d meshes in CC and
Import them to qgis (working in a fake section where the y-axis becomes
the altitude…)
where you can do classification Styling labeling etc.

I have been working like this for 5 years now in the German Archaeological
Institute, ist a pain in the ass sometimes, but the results are proper
phaseplans plan and section corresponding to each other. I hope we will
have a real powerful 3d GIS one-day...

All the Best

Max

Hi everyone,

Let me share some doubts and concerns regarding to a concrete
application of GRASS GIS to archaeology.

The point is that I would like to prepare some training exercises for a
group of archaeologists, and I'm dealing right now with the problem of
how to properly represent stratigraphic sections or cross sections over
an excavation site. I mean something like this:

stratigraphy

For the training exercises, I could own a collection or a series of
digital surface models (dsm), relative to every single step or
excavation phase on the excavation's site process. In a practical way,
that means that every time a stratum is removed, the archaeologists can
get a new digital surface model using a drone and a lidar sensor. Then
computing the difference between the previous dsm and the current one
(and so on, successively), they could obtain a collection of stratum or
layers to visualize it in a cross section diagram. I don't know if the
problem is enough well explained...

I've been reading and searching on the Internet for a while, about GRASS
GIS and stratigraphic/cross sections, but I've didn't find any hint
neither a clear clue about how to do it. So, the question is, is it
possible to get something similar to the previous or the following image
using GRASS GIS, as well as combined, with other tools or open source
software? Any answer, hint or clue will be really appreciated.

model

Thanks,
Lluís

--
Lluís Vicens
Servei de Sistemes d'Informació Geogràfica
--
Universitat de Girona
--
Pl. Ferrater Mora 1
17071 Girona
Tel +34 972 418 039 (7025 intern)
lluis.vicens@udg.edu

Lloc web:http://www.sigte.udg.edu
Twitter:http://twitter.com/SIGTE_UdG

_______________________________________________
grass-user mailing list
grass-user@lists.osgeo.org
https://lists.osgeo.org/mailman/listinfo/grass-user

4

On 12/11/18 14:42, Rich Shepard wrote:

On Mon, 12 Nov 2018, Lluís Vicens wrote:

[...]

A less expensive approach than using a LiDAR-equiped drone would be to
take depth measurements at points on a defined grid and use geostatistical
models to interpoate between unmeasured points. If you need to only map
strata, grass has capabilities for producing 3D models of geology but I've
not used them because I'm not a geologist.

Something to consider while others provide more explicit ideas.

Regards,

Rich

Richard,

Thanks for your considerations. I'll try to do something with 3d models in GRASS GIS.

Kind regards,

Lluís

_______________________________________________
grass-user mailing list
grass-user@lists.osgeo.org
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--
Lluís Vicens
Servei de Sistemes d'Informació Geogràfica
--
Universitat de Girona
--
Pl. Ferrater Mora 1
17071 Girona
Tel +34 972 418 039 (7025 intern)
lluis.vicens@udg.edu

Lloc web: http://www.sigte.udg.edu
Twitter: http://twitter.com/SIGTE_UdG

5

On 12/11/18 21:28, Max Haibt wrote:

Hi Lluis,

Hi Max,

a real 3d GIS for Archaeology is not available at the Moment. You may try
to create some 3d Volumes in Grassgis but your students will hate it !

It doesn't sound too much attractive... :slight_smile:

I have also been Looking for a solution to this (I am archaeologist
myself). But for now I stay with CloudCompare in 3d!!! Sadly CloudCompare
has no Attributetable connected to Features and Stylingoptions as you may
have enjoyed in Qgis. So unfold some section from your 3d meshes in CC and
Import them to qgis (working in a fake section where the y-axis becomes
the altitude…)
  where you can do classification Styling labeling etc.

I will take a look to Cloudcompare 3d (I've never ever heard nothing about it because I'm not so familiar with 3d software and engines), and then I will do the trick into QGIS.

I have been working like this for 5 years now in the German Archaeological
Institute, ist a pain in the ass sometimes, but the results are proper
phaseplans plan and section corresponding to each other. I hope we will
have a real powerful 3d GIS one-day...

Thanks for your ideas and for sharing you experience.
Kind regards,
Lluís

All the Best

Max

Hi everyone,

Let me share some doubts and concerns regarding to a concrete
application of GRASS GIS to archaeology.

The point is that I would like to prepare some training exercises for a
group of archaeologists, and I'm dealing right now with the problem of
how to properly represent stratigraphic sections or cross sections over
an excavation site. I mean something like this:

stratigraphy

For the training exercises, I could own a collection or a series of
digital surface models (dsm), relative to every single step or
excavation phase on the excavation's site process. In a practical way,
that means that every time a stratum is removed, the archaeologists can
get a new digital surface model using a drone and a lidar sensor. Then
computing the difference between the previous dsm and the current one
(and so on, successively), they could obtain a collection of stratum or
layers to visualize it in a cross section diagram. I don't know if the
problem is enough well explained...

I've been reading and searching on the Internet for a while, about GRASS
GIS and stratigraphic/cross sections, but I've didn't find any hint
neither a clear clue about how to do it. So, the question is, is it
possible to get something similar to the previous or the following image
using GRASS GIS, as well as combined, with other tools or open source
software? Any answer, hint or clue will be really appreciated.

model

Thanks,
Lluís

--
Lluís Vicens
Servei de Sistemes d'Informació Geogràfica
--
Universitat de Girona
--
Pl. Ferrater Mora 1
17071 Girona
Tel +34 972 418 039 (7025 intern)
lluis.vicens@udg.edu

Lloc web:http://www.sigte.udg.edu
Twitter:http://twitter.com/SIGTE_UdG

_______________________________________________
grass-user mailing list
grass-user@lists.osgeo.org
https://lists.osgeo.org/mailman/listinfo/grass-user

--
Lluís Vicens
Servei de Sistemes d'Informació Geogràfica
--
Universitat de Girona
--
Pl. Ferrater Mora 1
17071 Girona
Tel +34 972 418 039 (7025 intern)
lluis.vicens@udg.edu

Lloc web: http://www.sigte.udg.edu
Twitter: http://twitter.com/SIGTE_UdG