looking for some help mapping a small property

[Steven Goodfellow]

hi there im wanting to overlay a contour map onto a sattelite image of my small farm property for building water harvesting systems and a few roads. it appears that the learning curve for this software is way above my head and im wondering if someone would be nice enough to help? or please point me in the right direction of some tutorials that would help me achieve my aim. i have a lidar file and high resolution satellite image already and have downloaded qgis, is this the right software to use?

thanks a lot for any replies in advance,

Steven Goodfellow

[Terje Mathisen]

I'm sure we can help you, if you just post that lidar somewhere
accessible we can even help you with a LAStools pipeline that will
generate contours and a slope image. Those two are the most useful to
determine creek/stream paths.

Terje

--
- <Terje.M...@tmsw.no>
"almost all programming can be viewed as an exercise in caching"

[Steven Goodfellow]

thankyou Terje, here are dropbox links to the files 

https://www.dropbox.com/s/leao3an0umt7n2u/points.laz?dl=0

https://www.dropbox.com/s/26rkhgy3epql1h3/akatarawa%20satellite.jpg?dl=0

is QGIS the correct software that will help me work with this information?

I saw a youtube video https://youtu.be/gg7OunHKwUE about mapping 

and i was want to generate similar graphics that is shown at 3 minutes into the video

Steven

[Michael Stimson]

Questions about QGIS and visualization are slightly off-topic, I suggest you ask your question at GIS.Stackexchange ( https://gis.stackexchange.com/questions) with a description of the difficulty you are having. Is your LiDAR and orthophoto in the same coordinate reference system?

 

A general workflow is LASGround => LAS2DEM then generate contours from your raster with a utility like GDAL_Contour, all of these tools are available from the QGIS toolbox or can be run in a CMD batch file.

 

Michael Stimson Senior GIS Analyst RPS | Australia Asia Pacific D  +61 7 3539 9694 E  michael...@rpsgroup.com.au

 

From: last...@googlegroups.com <last...@googlegroups.com> On Behalf Of Steven Goodfellow
Sent: Tuesday, 16 February 2021 7:53 PM
To: LAStools - efficient tools for LiDAR processing <last...@googlegroups.com>
Subject: [LAStools] looking for some help mapping a small property

 

CAUTION: This email originated from outside of RPS.

hi there im wanting to overlay a contour map onto a sattelite image of my small farm property for building water harvesting systems and a few roads. it appears that the learning curve for this software is way above my head and im wondering if someone would be nice enough to help? or please point me in the right direction of some tutorials that would help me achieve my aim. i have a lidar file and high resolution satellite image already and have downloaded qgis, is this the right software to use?

thanks a lot for any replies in advance,

Steven Goodfellow

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[Ferenc Acs]

Hi,

>>i am wanting to overlay a contour map onto a satellite image of my small farm property for building water harvesting systems and a few roads.

A simple and quite accurate solution 

•  an orthorectified aerial (drone) composite-image , equipped with Ground Control Points should be used
•  QGIS "Georeferencer" tool will precisely overlay the composite-aerial image over the contour map

 

Regards

Frank 

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From: last...@googlegroups.com <last...@googlegroups.com> on behalf of Steven Goodfellow <swgood...@gmail.com>
Sent: Tuesday, 16 February 2021 8:53 PM

To: LAStools - efficient tools for LiDAR processing <last...@googlegroups.com>
Subject: [LAStools] looking for some help mapping a small property

hi there im wanting to overlay a contour map onto a sattelite image of my small farm property for building water harvesting systems and a few roads. it appears that the learning curve for this software is way above my head and im wondering if someone would be nice enough to help? or please point me in the right direction of some tutorials that would help me achieve my aim. i have a lidar file and high resolution satellite image already and have downloaded qgis, is this the right software to use?

thanks a lot for any replies in advance,

Steven Goodfellow

--

Download LAStools at
http://lastools.org
http://rapidlasso.com
Be social with LAStools at
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[Jesse Johnson]

Hi Steve,

Can you get a georeferenced version of the sat imagery? A tiff (.tif) file perhaps? This would make possible to line up the lidar info with the imagery file.

  Jesse

[Mark Levitski]

Here's some free work for you Steven. LOL

I would suggest more detailed data if your project is a serious one. A UAV dataset would be more granular and could be used for more accurate volume calcs for any dirt moving etc. 

These files will go right into your QGIS. The shapefile export for the contours created several files that I assume are GIS attributes such as elevation. 

https://drive.google.com/drive/folders/1PjLcqtCgYEmRQN-Arrphc4p4oQEAa_rA?usp=sharing

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[Jesse Johnson]

Nice work Mark! I know this is probably not the place to discuss this, but as I am fairly new to tinkering with GIS I am curious as to how you were able to produce the georeferenced tif from the jpg file?

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[Mark Levitski]

I didn't. I used some software to pull another image and create a Geotiff. 

To view this discussion on the web visit https://groups.google.com/d/msgid/lastools/CALUMmpbmDv-XPBgdug9hXJgJUYEwM7nzf7bN3_qFO286tZmomw%40mail.gmail.com.

[Michael Stimson]

Be extremely careful with drone data, many have spent thousands on equipment or contracted drone survey only to find the data does not meet their expectations. The LAS produced from photogrammetric methods (i.e. photography, even with an expensive camera) will not define the ground under vegetation, which is fine for building and tree models but as you want a good estimation of the ground for water flow you must use multiple discrete return or full wave form laser scanning to penetrate trees/grass and return a point on the ground.

 

In my opinion the increase of data that would be produced from a drone survey is more likely to be a hinderance than a benefit as local undulation from small rocks and other detritus will cause problems in your flow/slope calculations; your working DEM would end up with a great many pulses per cell, of which most are irrelevant.

 

Michael Stimson Senior GIS Analyst RPS | Australia Asia Pacific D  +61 7 3539 9694 E  michael...@rpsgroup.com.au

 

From: last...@googlegroups.com <last...@googlegroups.com> On Behalf Of Mark Levitski
Sent: Friday, 19 February 2021 6:42 AM
To: last...@googlegroups.com
Subject: Re: [LAStools] looking for some help mapping a small property

 

CAUTION: This email originated from outside of RPS.

I didn't. I used some software to pull another image and create a Geotiff. 

To view this discussion on the web visit https://groups.google.com/d/msgid/lastools/CALG8ac-PvBSp5wtBXPza9FOBYicp57wRdXfgUJ7D75zRozFm2g%40mail.gmail.com.

[Mark Levitski]

Drones carry other sensors too. To carry a high quality lidar scanner at lower altitude with greater point density and precision yields better data. Though you are correct to advise caution with photogrammetric data as well as contractors that don't know what they're doing.  

Some end users don't require detailed or even very accurate data. So choose your sources as warranted. There's a place for all if the limits are known. 

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[Jesse Johnson]

Hi Steven,

I was just revisiting this post and was wondering if you were able to get anything going with QGIS and lastools yet?

I have some interest in permaculture and QGIS and would be interested in working on helping you in any way I can, I have plenty of free time right now and this sort of project is where I would like to be headed with using mapping technology.  If you'd like you can send me a message, macrovisionmicrobe at gmail d0t com.

Cheers,

  Jesse