tudelft3d / terrainbook Goto Github PK

Yet, in case of good contours the reader will still be able to deduct the general morphology of the field

'deduct' should be 'deduce'

what bottom here?

and update the link in section 4.5 for the interpol data

In last paragraph of page 6 in chapter 1: "The shortcomings of (IR)regular tesselation..."

stuff there is good: https://en.wikipedia.org/wiki/Stream_(computing)

this will explain how startinpy works

In the third paragraph on sixth line from below: "interpolation methods below for for instance".
Page 36 last paragraph first sentence "The biggest concern polynomials is probably that while the interpolant" - I am guessing should be 'the biggest concern with polynomials', but I may be mistaken.

Hi, I think I may have found a small oversight in the book.

In the terrainbook under 5.3.2 there's a formula for Inverse Distance Weighting which is explained as follows:

"The weight 𝑤𝑖 (𝑥) assigned to each 𝑝𝑖 for a location 𝑥 is: 𝑤𝑖 (𝑥) = |𝑥 𝑝𝑖 |^−ℎ where ℎ defines the power to be used, and |𝑎𝑏| is the distance between two points 𝑎 and 𝑏."

Having looked further in the text, I can't find any reference to the "|𝑎𝑏|" and not in the formula given itself either, unless it is meant to be understood implicitly. I thought it wise to create an issue regarding this in case it isn't.

I hope this feedback is useful. Thanks for making the terrainbook openly available and for your time in making it.

the first part of the first sentence of 4.2.1. on page 38 is "We know that if we have n points in S in in R3" . I believe that is one time "in" too many.

Hi Hugo,

Small error, the citation now is:

@book{terrainbook,
	author = {Ledoux, Hugo and Arroyo Ohori, Ken and Peters, Ravi and Pronk, Maarten},
	publisher = {Self-published},
	title = {Computational modelling of terrains},
  doi = {10.5281/zenodo.3992107}
	year = {2022}}

but should be:

@book{terrainbook,
	author = {Ledoux, Hugo and Arroyo Ohori, Ken and Peters, Ravi and Pronk, Maarten},
	publisher = {Self-published},
	title = {Computational modelling of terrains},
        doi = {10.5281/zenodo.3992107},
	year = {2022}
}

Greets,
Daniel

https://github.com/fmarotta/kaobook

Explaining formula 4.2 under section 4.3.2 on page 38, at the top of page 39 it states " and |𝑎𝑏| is the distance between two points 𝑎 and 𝑏. " However, there is no a nor b in the formula.

p.9 Exercise 1
Explain in your own...

p.36 Exercise 5
if a new point (no s) is inserted

p. 50 Exercise 4
At two locations

p.88 Exercise 2
What would the... look like

p.91

• it can be extracted from the Delaunay triangulation or computed

p.97
Not sure , but:
For the purpose of this course, we define "massive" as....

p.103 Exercise 2
-Given a simple point cloud (no s) stored...

• how many passes over the file does the triangulator....

Chapter 13.3 has a subsection 13.3.0, I think a sub too much was used (so subsubsubsection instead of subsubsection).

• with ellipse (https://gdal.org/programs/gdal_grid.html)
• with nn
• with quadrant
• a mix of all the above

The text says that Runge's Phenomenon is observed when the polynomial overshoots at samples. In the figure, the polynomial is supposed to be $C^2$ i.e. continuous and smooth so that it can be differentiated at all points, however, at around x=5, there is a sharp change in the polynomial curve, where it won't be differentiable and thus not $C^2$ (since the limit of a function doesn't exist at points where the slope changes abruptly)

typos.pdf

make clear the values are the centre of pixels, so the graph is the dual

https://www.cloudcompare.org/doc/wiki/index.php?title=CSF_(plugin)

Figure 11.16d), fairly certain the entry for r=0.5, phi=90° should be 1, not 0

https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/about-citation-files

• check math
• improve figures with new code
• add overview of kriging types

1. the clothe (a raster surface)
2. be clearer about how to extract the ground point, it's only in the description but it should be a subsubsection in bold I reckon

one point at a time? many? iterations, etc.

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• chap2 about acquisition
• chap7 about runoff has several links to parts of papers
• chap10 about streaming
• chap11 about visibility/LoS in a TIN

why the scale turning to 0.4 from 0.5 means "more tension" rather than "less tension"? From 0.5 to 0.4, the size of the display vector representing internal force becomes smaller. According to the previous description, it should be more loose. Why is it more “tension”？

In the book, it says:

in the highlighted area, is it "internal"?

on page 113 the last text block, first sentence a ref is faulty and is displayed as "??"

this fact is only listed in 4.1 but some miss it apparently, so repeating in 4.3 makes it clearer.

Maybe add the equation to calculate the centre as well

it says smallest but should be largest

to harmonise this all

in DT/VD chapter

eg this: https://web.archive.org/web/20210506191306/http://www.ambrsoft.com/trigocalc/circle3d.htm

first line in the second alinea underneath Gradient.
Current: Notice that if calculate the gradient....
insert "we" or similar after 'if'