[HN Gopher] Guide to Making 3D Maps with Satellite Imagery in R
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Guide to Making 3D Maps with Satellite Imagery in R
Author : tylermw
Score : 184 points
Date : 2020-04-28 13:41 UTC (9 hours ago)
(HTM) web link (www.tylermw.com)
(TXT) w3m dump (www.tylermw.com)
| MR4D wrote:
| Has this been tried on something like a cityscape?
|
| If so, it seems like you could fly a drone with two cameras at
| relatively low altitude and get insane resolution for things like
| cityscapes at a pretty low cost
|
| ====== EDIT: Meant to add that your webpage discussion was great
| & thanks for sharing!
| tylermw wrote:
| Thanks! For your question, check out Open Drone Map, which is
| an open source toolkit for doing just that:
|
| https://www.opendronemap.org
|
| I also provide instructions in my (free and open source!)
| masterclass on how to take LIDAR data from cities and build 3D
| surface models that includes buildings:
|
| Github Course Materials:
|
| https://github.com/tylermorganwall/MusaMasterclass
| ladberg wrote:
| Most "satellite view" imagery of cities is actually done with
| planes and drones. I just looked up a 3D model of my house in
| Apple Maps and can see stuff with a few centimeter resolution,
| which is much higher than any satellite can do.
| aryx wrote:
| How do I 3d print it with colors?
| tylermw wrote:
| No color support, but you can export the map to an STL file
| with the function `save_3dprint()`. You can declare the maximum
| width/depth and it will scale the model to the size you've
| specified.
| sailfast wrote:
| This is super interesting - I had no idea you could do this kind
| of thing with R. Very cool and a great step-by-step guide.
|
| I also second the "rite of passage to fight with GDAL" sentiment
| :)
|
| I'd also recommend Robert Simmon's introduction to GDAL for
| stitching, etc: http://www.openvisconf.com/2017/#rsimmon-video-
| item
| tylermw wrote:
| The R GIS ecosystem has seen great strides recently! I've just
| been working on one part of it: 3D visualization and
| computational hillshading/raytracing.
|
| And that video looks like a great resource--I'll put it on my
| watch list.
| kylebarron wrote:
| You should check out Mapdeck [0]. It's R bindings to deck.gl,
| a JS 2D/3D geo-visualization package that I've been
| contributing to. As of version 8.1, there's a TerrainLayer
| [1] to render an interactive map with a 3D terrain mesh.
|
| [0]: https://github.com/SymbolixAU/mapdeck [1]:
| https://deck.gl/#/documentation/deckgl-api-
| reference/layers/...
| amrrs wrote:
| A self plug. I'd once put together a ppt that's cherry picked
| 'can R do this kind of examples'
| https://speakerdeck.com/amrrs/r-in-the-real-world
| burger_moon wrote:
| Is this similar to what vricon[1] does?
|
| I was searching around and found something noting they won a
| contract to build the Army's One World Terrain 3d model. This OWT
| appears to be some kind of classification for applying sat
| imagery over terrain data sets, maybe?
|
| [1] https://www.vricon.com
| tylermw wrote:
| It looks like they're a firm that does large-scale
| photogrammetry to build 3D models worldwide--this is just a
| tutorial on how to combine existing topographic datasets (e.g
| SRTM or a USGS elevation product) with satellite imagery to
| generate small-scale 3D maps in R. Similar in concept, vastly
| different in scale and execution
| burger_moon wrote:
| Ok thanks for the explanation! I read through the tutorial
| and it looks like a fun project to get started in.
|
| One thing also for readers is that https://dwtkns.com/srtm30m
| requires an account with https://urs.earthdata.nasa.gov to
| download tiles.
| tylermw wrote:
| Good to know, thanks! I'll add a note mentioning the need
| for an account.
| hughes wrote:
| Here I thought you'd be doing photogrammetry or something to
| produce 3d maps directly from 2d imagery.
|
| Maybe title should be "making 3d maps with satellite imagery and
| 3d maps" ;)
| tylermw wrote:
| Author here, I wrote this to show how you can use the rayshader
| package to generate 3D maps in R using free and open data (in
| this case, Landsat 8 imagery and SRTM elevation data). You can
| check out rayshader's Github repo here:
|
| Github: https://www.github.com/tylermorganwall/rayshader
|
| And browse the documentation (with rendered examples) and README
| on its website: https://www.rayshader.com
| andybak wrote:
| On a side note - you don't know a free tile server that serves
| elevation tiles, do you?
| dtf wrote:
| The Mapzen elevation tilesets are on S3:
|
| https://www.mapzen.com/blog/terrain-tile-service/
|
| https://registry.opendata.aws/terrain-tiles/
| kylebarron wrote:
| This is the best option for free terrain tiles. There are
| four formats, though "Terrarium" is the most used. It maps
| RGB pixels in a PNG to raw elevation values using this
| formula [0]. If you're using Mapbox GL, you can just point
| your map to [1] to fetch the tiles, and then use it as a
| hillshade. I do that in my topographic map style [2].
|
| [0]: https://github.com/tilezen/joerd/blob/master/docs/form
| ats.md...
|
| [1]: https://s3.amazonaws.com/elevation-tiles-
| prod/terrarium/{z}/...
|
| [2]: https://nst-guide.github.io/osm-liberty-topo/
| tylermw wrote:
| Mapbox has an API you can query from--I believe they have a
| free tier. The `ceramic` package makes this easy to pull
| from, but you need to get a Mapbox key first:
|
| https://github.com/hypertidy/ceramic
| tylermw wrote:
| Additionally, the `elevatr` package
| (https://github.com/jhollist/elevatr) serves tiles directly
| from AWS Open Data Terrain Tiles. I don't believe it requires
| a key.
| jointpdf wrote:
| Here are a couple more ways to get SRTM tiles:
|
| - OpenTopography (also has 3DEP/LIDAR data): https://portal.o
| pentopography.org/datasetMetadata?otCollecti...
|
| - SRTM 30M tile tool: https://dwtkns.com/srtm30m/
| tylermw wrote:
| Related: in my masterclass (free and open source, materials
| here: https://github.com/tylermorganwall/MusaMasterclass) I
| also walk through how you can convert LIDAR data into hi-
| res DEMs to generate 2D and 3D maps
| pks016 wrote:
| Unfortunately, SRTM 30M tile tool is asking for credentials
| for me.
| tylermw wrote:
| You can also query elevation tiles using the `elevatr`
| package and use them in a similar way.
| ktpsns wrote:
| Cudos to this code and the beautiful artwork (great README file
| for a github repository, btw). As somebody who worked a bit in
| visualization in scipy and blender, I can appreciate how much
| hard work have been put there. I did visualization as a small
| side project during my astrophysics PhD, and it was a pain in
| the ass to get anything good looking out of the data.
| tylermw wrote:
| Thanks! I always enjoy when a library has a solid README with
| examples, especially when it's a visualization library.
| Wanted to make sure I had one myself.
| thdrdt wrote:
| Today there is a nice GIS plugin for blender which makes life
| much easier:
|
| https://github.com/domlysz/BlenderGIS/blob/master/README.md
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