Re: [Qgis-user] plugin for drones

[friedtj]

We are using altizure for flight planning of a DJI drone: not that I'd recommend
it as it is not opensource, but I am not aware of a FOSS solution.

I have written http://jmfriedt.free.fr/glmf_micmac_uav_eng.pdf as a tutorial on 
using the
French National Geographic Institute Micmac for processing UAV pictures to 
generate
orthophotos and DEMs. It will work with a few hundred pictures if you are 
patient enough.
The tutorial will not avoid reading at least part of the excellent Micmac 
documentation
found at https://github.com/micmacIGN/Documentation/blob/master/DocMicMac.pdf

JM

- Mail original -
De: "Alexandre Neto" 
À: "Nuno de Santos Loureiro" , qgis-user@lists.osgeo.org
Envoyé: Lundi 14 Août 2017 20:48:37
Objet: Re: [Qgis-user] plugin for drones




Nuno, 

Foe 


A seg, 14/08/2017, 19:05, Nuno de Santos Loureiro < nlou...@ualg.pt > escreveu: 


Hello all, 

Can anyone be so kind to send suggestions about flight planners for 
DJI Phantom drones that run in android devices? 

And QGIS plugins to make georeferenced aerial coverages using a few 
hundreds of DJI Phantom vertical pictures? 

Many thanks for your attention, 

Nuno 


-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x- 
Nuno de Santos Loureiro (PhD) 
Faculdade de Ciências e Tecnologia - DCTMA - Ed. 8 
Universidade do Algarve 
Campus de Gambelas 
8005-139 FARO (Portugal) 
-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x- 

 
This message was sent using IMP, the Internet Messaging Program. 

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Alexandre Neto 
- 
@AlexNetoGeo 
http://sigsemgrilhetas.wordpress.com http://gisunchained.wordpress.com 

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Re: [Qgis-user] GPR-maps

[friedtj]

You will find in the English documentation of 
http://sourceforge.net/projects/proexgprcontrol/
the scripts (GNU/Octave) for generating reflection intensity maps at various 
depths I use
for processing GPR datasets and importing those in QGis as ovelayers to 
georeferenced
aerial images.

JM

 Am 17.03.2015, 13:53 Uhr, schrieb Randal Hale  
 rjh...@northrivergeographic.com:
 
  Well - I guess first:Are the GPR results georeferenced (i.e. do they  
  have a location in the world)?Is the map you already have with the  
  houses - is it digital and is it georeferenced?
 Can I use a map where there already are drawn some houses?
 For me sounds more like he's asking for some kind of basemap, so maybe a  
 different topic.
 
 Bernd
 
 
  Those two questions should start the ball rolling toward an answer.
  Randy
 
 
  On 03/17/2015 07:13 AM, Christer Andersson wrote:
  Hi,can anybody give an advice how to make a map of a ground penetrating  
  radar investigation of 15x20 meter, where I know the longitudes and  
  latitudes of the four corners in the rectangle. I would like to have  
  latitude and longitude along the sides of the map too. Can I use a  
  map where there already are drawn some houses?
  It is extremely hard to learn from the manual. The instructions do not  
  always correspond with Qgis 2.8.1.
  I would be very grateful for some help to get along with this.
  /Christer
 
 
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  ---
  Randal Hale
  North River Geographic Systems, Inc
  http://www.northrivergeographic.com
  423.653.3611 rjh...@northrivergeographic.com
  twitter:rjhale http://about.me/rjhale
  http://www.northrivergeographic.com/introduction-to-quantum-gis
 
 
 


-- 
JM Friedt, FEMTO-ST Time  Frequency/SENSeOR, 32 av. observatoire, 25044 
Besancon, France
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Re: [Qgis-user] cartogram plugin

[friedtj]

I am afraid I do not have the skills for long term maintenance, so providing a 
quick
hack through the mailing list seemed better than keeping the issue unresolved. 
What
I am missing here is a reference dataset to check whether a modification in the 
source
code of the plugin affects its behaviour. On the convex dataset I was 
considering the
result was not as nice as could have been expected from the illustration found 
at
http://anitagraser.com/2010/11/13/creating-cartograms-with-qgis-cartogram-creator/
 whose
dataset I do not have access to. I am currently running the plugin on a world 
population 
dataset as found at http://thematicmapping.org/downloads/world_borders.php to 
check on
a non-convex map whether the result matches expectations, but a reliable 
testbed would 
be better suited. As an example which hints at proper operation of the plugin, 
the
2005 world population map becomes 
http://jmfriedt.sequanux.org/world_cartogram.png with
purple the original dataset, green 10 iterations and greyish blue being 27 
interations. 

If such a result seems relevant, maybe some knowledgeable user can comment on 
the figures
of http://jmfriedt.sequanux.org/lm_cart.pdf in which the Voronoi polygon map 
generated from
discrete measurements (train travel time in France, Fig. 1) becomes the 
cartograms of Fig. 4 
which do not seem that informative to me. Is this an known artefact from convex 
maps ? 
(obviously a diffusion algorithm applied to a convex dataset ends up generating 
a cicular 
map I assume).

Happy new year, JM

- Mail original -
De: Richard Duivenvoorde rdmaili...@duif.net
À: frie...@free.fr, Qgis-user@lists.osgeo.org, carson farmer 
carson.far...@gmail.com, kikkocrist...@gmail.com
Envoyé: Jeudi 1 Janvier 2015 09:29:50
Objet: Re: [Qgis-user] cartogram plugin

On 30-12-14 09:39, frie...@free.fr wrote:
 trivial comment concerning the Cartogram Plugin:

Hi,

as the original author is Carson Farmer, and apparently people ask for
this plugin, I'm wondering if it is maybe an idea to put this plugin in
the main QGIS plugin repository.

And if Carson does not have time to do the maintaining of the plugin, we
ask one of the users to maybe do the maintenance?

@Carson: what's you opinion about that?
@Others: any volunteers?

We every now and then have plugins for which there is interest, but the
original author lost interest, of just does not find time anymore to
invest it in responding to questions or doing trivial fixes if needed
for a new QGIS version.

So in general: in these cases: please try to contact the original author
and see if you can maybe take over the maintainer ship of such a plugin?
In this case for example it looks like some lines of code would make it
usable again for QGIS users...
Active central maintenance and availability via plugins.qgis.org is
better then scattered fixes over mailing lists and GisStackExchange/

Any takers, IF Carson agrees?

Regards,

Richard Duivenvoorde


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[Qgis-user] cartogram plugin

[friedtj]

trivial comment concerning the Cartogram Plugin:
I wanted to play with the cartogram generation plugin from QGis and found
it was not operating properly with the latest release available from the
Debian repository
deb http://qgis.org/debian-nightly jessie main

If it can be of any help to anyone attempting the same: after downloading the
git repository from https://github.com/CristianCantoro/cartogram-plugin and
putting the resulting directory in .qgis/python/plugins
1/ in metadata.txt, extend the qgisMaximumVersion=2.8
2/ after applying the correction mentioned in
http://gis.stackexchange.com/questions/72328/where-has-the-cartogram-plugin-for-qgis-gone/91209#91209
 (namely, remove lines 58 to 60), in doCartogram.py, 
lines 285
if lfeat.dValue != NULL:
   dTotalValue += lfeat.dValue
and 305
if dPolygonValue != NULL :
dDesired = dPolygonValue * dFraction
allow the script to run and generate a usable result. I should emphasize that
I have no clue as to Python programming and this approach might be completely
erroneous.

JM
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[Qgis-user] importing NOAA LEO images in QGis ?

[friedtj]

This might be pushing the limits of what can be asked on a mailing list, and I 
am 
not even sure it is a QGis related question, but let's try:
I receive for fun NOAA POES satellite images (NOAA-15, NOAA-18  NOAA-19) 
through a
low cost radiofrequency receiver, which generates images of very acceptable 
quality. A
proprietary yet free software such as wxtoimg not only decodes the pixel 
intensity
out of the recorded audio file (AM demodulation of the 2400 Hz audio carrier), 
but
is also able to overlay a map. I wonder what steps would be needed to import 
into
QGis one of the images recorded from these NOAA LEO satellites and 
geoereference each
pixel, considering I know the orbital parameters (available from NORAD through 
Celestrak)
and the exact time at which the image was recorded.
Could this be done from QGis ? or one of its plugins such as OTB ?

Thanks, JM
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Re: [Qgis-user] delimited text point cloud color attribute ?

[friedtj]

fantastic, that did it, I was not aware of the color_rgb() functionnality
in the Expression Builder.

Thanks a lot.

JM

- Mail original -
De: Chris Crook ccr...@linz.govt.nz
À: frie...@free.fr, Qgis-user@lists.osgeo.org
Envoyé: Dimanche 22 Juin 2014 10:04:57
Objet: RE: [Qgis-user] delimited text point cloud color attribute ?

You can do this by using a data defined properties.

Go in to layer properties
Select the Style tab
Pick a single symbol as the marker type
In the bottom left of the dialog is the symbol layers panel.
Click the Simple marker
Then in the panel to the right click Data defined properties
This will bring up the data defined properties dialog box
Click the fill color check box, and then click the [...] button to the right of 
it (expression)
This will get you into the Expression string builder
Click on the Color group to expand it out, then enter the following in the 
Expression box

color_rgb(R,G,B)


Then click Ok as many times as necessary to get out .. this should do it.

Sounds complicated, but makes more sense when you do it than when you try to 
write it down!

CHeers
Chris





From: frie...@free.fr [frie...@free.fr]
Sent: 21 June 2014 19:32
To: Qgis-user@lists.osgeo.org
Subject: [Qgis-user] delimited text point cloud color attribute ?

I am sure this is a trivial question by I am unable to locate the solution on 
the
web after a couple of days of searching :
I have a point cloud defined with coordinates and RGB color attributes, ie a 
file with

XYZR   G   B
508.71444702 255.17164612 316.63302612 254 254 254
508.85519409 255.27404785 316.73541260 254 254 254
508.86724854 255.21253967 316.71292114 252 254 254
508.92807007 255.21278381 316.73757935 247 251 253

I can load this file using the Add Delimited Text Layer tool, and at the moment 
I
use the Z elevation attribute to color my point cloud in QGis (Properties - 
Graduated
in Symbol option and Column = Z). I would like now each point to be colored by 
the RGB
attribute: how can I do this ? I know this is trivial for raster layers, but I 
cannot
find the solution for a vector layer.

Thanks, Jean-Michel


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Re: [Qgis-user] OpenSource software for Drones

[friedtj]

FYI, I am just in the process of completing an introductory tutorial on MicMac 
including
orthorectified imaging. At the moment it is all in French, I will translate it 
to English
as soon as this initial draft is proofread by some friends (ongoing work so the 
included
images have not yet been shrunk to a manageable size ... huge PDF document at 
the moment).

In the mean time you can have a look at the pictures to see what topic will be 
addressed:
http://jmfriedt.free.fr/lm_sfm.pdf
The topic of UAV is addressed with some images acquired from a toy and 
processed using
MicMac (p.13 of my document). MicMac is absolutely fascinating and well worth 
the time: I
have only been involved for the last couple of months but can't stop acquiring 
pictures for
SfM everywhere I go now. Any French speaking reader on this list who might have 
some comment
on the document is welcome to do so.

JM

- Mail original -
De: Brent Fraser bfra...@geoanalytic.com
À: Lene Fischer l...@ign.ku.dk, qgis-user@lists.osgeo.org
Envoyé: Vendredi 20 Juin 2014 15:32:41
Objet: Re: [Qgis-user] OpenSource software for Drones



Lene, 

While I had been following DIY UAV effort for may years, I just seriously 
started about 18 months ago. My goal was to be able to reliably provide 
ortho-rectified high resolution imagery. Here are some of things I've learned: 

1. It is possible to buy some off-the-shelf systems (e.g. 
www.aeryon.com/products/avs/aeryon-scout.html ) but they can cost $20K to $60k 
and are not open (on the other hand, they are very reliable). 3DR (the 
commercial store for DiyDrones) has cost-effective, open systems. They just 
released their Iris/Pixhawk systems. 

2. The DIY Drones ecosystem is mostly populated with people who just want to 
build, fly, and experiment with their own UAV platforms (frame, powertrain and 
flight controller), but there a few people interested in acquiring and 
processing UAV imagery as well. Personally, I look at a UAV as [just] a camera 
positioning system ;) 

3. Most of the software development effort in UAV image processing comes from 
the computer vision space (e.g OpenCV). Google structure from motion for 
more info on that type of processing chain. I'm unsure if that method pays 
enough attention to rigorous image geometry to produce accurate ortho-rectified 
imagery. Maybe; at any rate I want DEMs and geotiffs as an end result (I think) 
and that chain tends to produce non-georeferenced 3D models. And if you've got 
a few hours to burn reading current research, google UAV SLAM... 

5. MicMac ( http://logiciels.ign.fr/?-Micmac,3- ) seems to use photogrammetric 
principles, is set up to use UAV imagery, and is Open Source, but as I 
mentioned before the learning curve is steep. Their user forum ( 
http://forum-micmac.forumprod.com/ ) has links to the user doc (280 page PDF!) 
and some sample data to work thru the examples in the user doc. Another 
possibility is OSSIM/OTB, and while their algorithms are excellent, I don't 
think the software is set up to deal with hundreds of images (bundle 
adjustment, etc), and it doesn't produce DEMs (yet). 

6. Lots of R  D to be done yet. For example, using RTK/Post-processing to 
calculate accurate camera centers (so no ground control points necessary). Some 
models of the cheap UBLOX GPS receivers can generate pseudo-range info, so 
RTKLib is a possibility. 

Good Luck! 
Best Regards,
Brent Fraser On 6/19/2014 9:29 AM, Lene Fischer wrote: 





Thanks for all the good links – I´ll now have something to look into 

Regards 






Lene Fischer 


Associate Professor 





Department of Geosciences and Natural Resource Management 


University of Copenhagen 








MOB +45 40115084 


l...@ign.ku.dk 








SCIENCE_bomaerke_UK






Fra: qgis-user-boun...@lists.osgeo.org [ 
mailto:qgis-user-boun...@lists.osgeo.org ] På vegne af Stefan Sylla 
Sendt: 19. juni 2014 04:39 
Til: qgis-user@lists.osgeo.org 
Emne: Re: [Qgis-user] OpenSource software for Drones 



Even though its not QGIS-related, but check this out: 

http://wiki.paparazziuav.org/wiki/Main_Page 



View this message in context: Re: OpenSource software for Drones 
Sent from the Quantum GIS - User mailing list archive at Nabble.com. 


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[Qgis-user] delimited text point cloud color attribute ?

[friedtj]

I am sure this is a trivial question by I am unable to locate the solution on 
the
web after a couple of days of searching :
I have a point cloud defined with coordinates and RGB color attributes, ie a 
file with

XYZR   G   B
508.71444702 255.17164612 316.63302612 254 254 254
508.85519409 255.27404785 316.73541260 254 254 254
508.86724854 255.21253967 316.71292114 252 254 254
508.92807007 255.21278381 316.73757935 247 251 253

I can load this file using the Add Delimited Text Layer tool, and at the moment 
I
use the Z elevation attribute to color my point cloud in QGis (Properties - 
Graduated
in Symbol option and Column = Z). I would like now each point to be colored by 
the RGB
attribute: how can I do this ? I know this is trivial for raster layers, but I 
cannot
find the solution for a vector layer.

Thanks, Jean-Michel
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