ChristopheLeBas, 21 days ago

Then, i used #QGIS to play with it ! ⏯️

QGIS calculated a Modèle numérique de surface (MNS - the second image / digital surface model), and an elevation model. 🗺️

But there a problem : we don't have (yet), RGB colors in our lidar datas ! So, we can just color form the elevation. Not create a real image of the terrain, with threes, factories... sad.

BUT !

A digital surface model made with QGIS. Low ground in blue, high in red. We can see some house and factory.

ChristopheLeBas, 21 days ago

💡 But we have a solution. Not a good one if you want my opinion but...

We can pick an orthophoto of our terrain and use it to color all our points in the lidar file. Hard time using #CloudCompare... 🏜️

Here, you can see the image. I downloaded it from IGN again, extract the right size from the lidar

Here is a link to CloudCompare
https://www.danielgm.net/cc/

#lidar #ign #OrthoPhoto #map #maps #mapping #QGIS

ChristopheLeBas, 21 days ago

Why is not so good ? Because an orthoimage is not as precise as a lidar, there's pixels, etc. so we are loosing in quality. ⛏️

Also, we are using another tool, CloudCompare, so there's compression issue, some datas are lost. So, not so good. 📉

Why can't we have RGB in our lidar, as in Netherland ? Don't no... #IGN ? Please ? ❓

ChristopheLeBas, 21 days ago

But, here's the result :) And it's quite satisfying to have a result :D 🗺️

And a VIDEO ? YES

#map #maps #mapping #lidar #data #pointmap #qgis #beauty

A lidar image with good rgb color from the orthophoto

vpicavet, 21 days ago

@ChristopheLeBas You can dynamically apply an RGB image on a LIDAR data in #Giro3D, you can see the examples here https://giro3d.org/examples/index.html #Threejs #3DWeb #OpenSource #Geospatial

ChristopheLeBas, 21 days ago

With QGIS, we can create a 3D view, and a video. You have it here. 🎥

There's 600 images generatded by QGIS then assembled with GIMP. Quite... hardtime again.

I don't know why i have map 3d map, and a second map just in the back. If someone can help :)
#maps #mapping #map #gif #qgis #lidar #data

A gif of the colorizer lidar point thanks to cloucompare

vpicavet, 21 days ago

@ChristopheLeBas The second one is the 2D layer corresponding to your LIDAR data. QGIS displays all 2D layers by default, in a 3D view. Without any elevation it is at elevation 0, so below your 3D data. You can disable the 2D layer, or specify a DEM to use as elevation so that the 2D layer will be projected onto the DEM, theoritically at the same place as the PointCloud data.