Hi Prof.

I am happy to hear you here!

I think what you should look at it the algorithm used in different software and then compare them with those used in ArcGIS, because there is a lot of interpolation method that can be used in this case, however the Delaunay triangulation is one of the most commonly used. Regarding about the open source software, I think QGIS uses the same algorithm as ArcGIS (I would like to recommend you to check it). R Software can also be used to generate DEM and it includes many packages and libraries (that you can import), however you should read the R documentation to see how those algorithm works. Since R is much flexible and constantly updated and integrated it might have some advanced and well documented algorithm.

I hope this helps!

Hello, I suggest Qgis for your purpose.

https://www.qgis.org/fr/site/

Kind regards

I agree with Dr. Patrik Silva and Dr. Adil Salhi, you can use both.

R is more flexible and the algorithms are well documented. However, if programming is not your cup of tea I definitely recommend you QGIS.

I hope this will help you

Hi,

Besides the generalized method in ARCGIS, there are some specified tools like ARCHYDRO which handles that well.

In my opinion, at the moment QGIS is one of the best GIS Open Source software, its development is going very fast and with very good quality and its also improving it's documentation. Very flexible!

Sorry, I missed thee point. QGIS is fine. You may also want to try GRASS GIS or SAGA GIS

Oluwafemi Adeyeri actually GRASS and SAGA are integrated into QGIS, we just need to call them.

Patrik Silva yes, you are right. There are also very robust standalone versions.

Thank you all for your answers!

But my problem is: are those softwares capable of produce a good DEM, made from mass points, contour lines, hard/soft breaklines, soft/hard replace, etc., just like ArcGIS do?

As I can see, QGIS produces a DEM only from contour lines... Is it right?

Ok, Prof.

Now, I understood you. In ArcGIS I know that we can incorporate all (mass points, contour, breaklines/soft and hard etc) into the single model and straightforward.

At least in QGIS 2.18 I think there is no such possibility, however, its possible to interpolate mass point in QGIS. You must download the "interpolation" plugin, which will allows you to customize some parameters.

In addition, I am still believing that R software might have something better then QGIS, however I am not quite familiar with R.

Good luck!

Best regards!

Please, see this link

https://www.qgistutorials.com/en/docs/interpolating_point_data.html

I just have realized that QGIS can make use of all the said data: mass points, contour, breaklines, structure lines and constraints in the plugin that I have just mentioned you (interpolation). Similiar to ArcGIS. Please have a quick look at the link, it provide all the necessary information that you might need.

https://qgis-documentation.readthedocs.io/en/latest/plugins/plugins_interpolation.html

Please let me now if you need any further help.

NOTE: you must add the layer that contain the elevation information (contour), set all parameters and add it to the lower box, and then choose another layer (mass point) set all the parameters and add it to the box, in this successive steps.

Muito obrigado, caro Patrik!

Vou ver o que tu me indicaste.

(já não sou "Prof.", por isso, trata-me pelo nome...)

Um abraço!

De nada Carlos Delgado , eu normalmente tenho o habito de chamar de Prof. todos os meus ex-profs, alias sempre serao.

Abraco! Boa sorte.