a) how to launch the ros2 interface and b) how to import a field from a .shp format about fields2cover HOT 7 CLOSED

Hi @helix22, welcome to the project!

First, I don't think you can delete the issue. It is good to have a log on doubts people have, so others can solve their questions faster too! btw, rename the issue if you can to give more context. About your questions:

a) Unfortunately the ROS demo was only available for ROS 1. The good part is that Nav2 is working on an interface with F2C.

b) Download your file as Well-Known Text (WKT). You can import a multipolygon as F2CCells c; c.importFromWkt("THE WKT INFO");

I hope this solve the issue :)

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Hi @helix22,

There is an example in the tutorials on using importFromWkt for a point. Similarly, you can do the same with F2CCell. This is the code in python:

import fields2cover as f2c
c = f2c.Cell()
c.importFromWkt("POLYGON ((571826.879847092 4454303.72791723,571995.622984484 4454429.58217387,572016.674058808 4454401.14195982,571852.381533276 4454277.61374514,571826.879847092 4454303.72791723))")

f2c.Visualizer.figure()
f2c.Visualizer.plot(c)
f2c.Visualizer.show()

Hope this is useful!

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Hello again! For the record and for anyone wondering in the future I sum up (please jump in where I am mistaken):

My query started since I could not transform the format of my field into the .xml format used in the tutorial 7_complete_flow. So, a field in a shp format, maybe from QGIS app (probably a number of files, 5 in my case: .cpg, .dbf, .shp, .prj, .shx) can be easily converted to WKT from here: https://mygeodata.cloud/converter/shp-to-wkt.

Then, you can create a Cell and import the polygon as above.

Then you can use:

cells = f2c.Cells()
cells.addGeometry(c)

And if using the exact tutorial 7, you will have to switch the "field.field" in the no_hl = ... to "cells", and also in the plotting later, as you have not defined "field" anywhere. So, like this, you can import any field/polygon from wkt format and easily work on it.

Many thanks to Gonzalo-Mier for the explanations.

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Dear Gonzalo-Mier, thank you very much for this quick reply!!

Regarding the (1), okay good, I thought I was missing something, maybe I will try installing ROS1 to try it as well!
Regarding the (2), everything is clearer already, I just can't get to place my wkt data into the importFromWkt. Could you spend some more time in order to give me an example? i.e. if my field is this in WKT: "POLYGON ((571826.879847092 4454303.72791723,571995.622984484 4454429.58217387,572016.674058808 4454401.14195982,571852.381533276 4454277.61374514,571826.879847092 4454303.72791723))"

Thanks again!! :)

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Done! Great! Ok now I will try to import "c" in the complete flow as a field and transform it to UTM to work in meters.

So many thanks! :)

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Right! So the very last question of this thread would be.. Well obviously commenting out field = f2c.Parser... and the transform after, and even more obviously typing instead "field = c" (where c is my polygon that i imported from Wkt, for anyone checking please see above) does not work, so what am I missing for the n^th time? ('Cell' object has not attribute 'field'). A sincere apology for my lack of skills here.

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