How to keep `X` and `Q` styles at the same time in `tabularray`?

Question

tabularray is quite useful as I need to do these things:

1. Keep the table as wide as \textwidth
2. I need to insert note{} in the caption of the table
3. The head of the table are two many characters, so they are divided into several lines in one cell. In this case, I need to keep short heads to be the middle of the cell of the table
4. Keep the number decimal aligned

As I know:

• To achieve 1, I can use tblr or talltblr with X format
• To achieve 2, I need use talltblr
• To achieve 4, I can use talltblr with X and si={}

But, how can I achieve 3 by talltblr? If we can merge Q format into talltblr, these four functions could be achieved at the same time.

For example:

\documentclass{article}
\usepackage{tabularray}
\usepackage{siunitx}
\usepackage{romannum}
\UseTblrLibrary{booktabs, siunitx}
\begin{document}
\begin{table}[h]
  \begin{talltblr}
    [caption={Main component geographic information table\TblrNote{1}},
     label={tab:Main component geographic information table},
     note{1}={The data is obtained through satellite maps, and there are certain errors},
     note{2}={The latitude and longitude of the surface is the latitude and longitude of its centroid. There is a certain error in the measurement of latitude and longitude, for reference},
     note{3}={This length is the length in our study area}
    ]
    {colspec={
              X[1.5,r] X[1.3,c] X[1.3,c] X[c,si={table-format=4.2},0.8] X[c,si={table-format=4.2},0.8] X[c,si={table-format=1.2},0.8]
              } 
    }
    \toprule
      name  & latitude\TblrNote{2} & longitude &{gggggg\unit{\m}}  & gggggg\unit{\m} \TblrNote{3} &{{{area total\unit{\km\squared}}}}\
     \midrule
  DongLake      &\ang{30;33;29.52}N &\ang{114;22;47.55}E &             &         & 12.74 \\
  dongtinglake     &\ang{30;33;12.71}N &\ang{114;20;46.87}E &         &         &0.12 \\
  great river      &\ang{30;33;33.66}N &\ang[minimum-integer-digits=2]{114;20;09.29}E & 1682.88&         &        \\
 bigbig lake      &\ang[minimum-integer-digits=2]{30;34;06.02}N &\ang{114;19;45.86}E &         &         & 2.74    \\
 inside the gate   &\ang{30;33;54.85}N &\ang{114;18;35.99}E &         &         & 0.06  \\
  new ditches     &\ang{30;35;33.19}N &\ang[minimum-integer-digits=2]{114;23;02.77}E & 977    &         &         \\
  west part of new gate   &\ang{30;35;26.31}N &\ang{114;21;43.67}E & 5213.77 &         &         \\
 luoai port   &\ang[minimum-integer-digits=2]{30;37;08.49}N &\ang{114;21;27.93}E & 3770.58 &         &         \\

qingling port     &\ang[minimum-integer-digits=2]{30;39;02.32}N &\ang{114;24;30.27}E &         &         & 0.13   \
      from port to lake &\ang[minimum-integer-digits=2]{30;37;03.06}N &\ang{114;24;22.99}E & 345.15 &         &        \
    east part of the gate   &\ang[minimum-integer-digits=2]{30;38;05.41}N &\ang{114;24;27.64}E &2926.08 &         &         \
   Yangzi river     &\ang{30;37;43.29}N &\ang{114;20;58.87}E &         &         &         \
      east part of the lake   &\ang{30;35;55.14}N &\ang{114;23;14.49}E & 1090.45 &         &         \
      donghu port     &\ang{30;35;37.38}N &\ang{114;23;45.81}E & 7332.3 & \num{4614.19} &         \
   west section of qingqing   &\ang[minimum-integer-digits=2]{30;38;01.20}N &\ang{114;24;11.10}E & 3449.86 &         &         \
    new road   drainage station &\ang{30;33;55.17}N &\ang{114;18;48.14}E &         &         &         \
nanjing drainage station  &\ang{30;33;52.23}N &\ang{114;18;29.72}E &         &         &         \
      beijing pumping station   &\ang{30;37;22.34}N &\ang[minimum-integer-digits=2]{114;21;01.01}E &         &         &         \
      guilin road gata   &\ang{30;37;19.42}N &\ang{114;20;57.23}E &         &         &       \
      the last gate     &\ang{30;39;16.08}N &\ang{114;24;31.97}E &         &         &     \

    \bottomrule
\end{talltblr}
\end{table}
\end{document}

How to make this table to achieve the four requests?

Another question: why can't I replace gggggg with Length? When I did this, there is error: Package siunitx Error: Invalid number 'e'.

Answer 1

Edit: ups, I didn't upload the last version of code and image. Corrected now. So4ry for noise ...

As starting point:

\documentclass{article}
\usepackage{tabularray}
\UseTblrLibrary{booktabs, siunitx} % libraries loads packages of the same names
\begin{document}
    \begin{table}[h]
    \sisetup{minimum-integer-digits=2}
\begin{talltblr}[
caption = {Main component geographic information table},
  label = {tab:Main component geographic information table},
remark{Note} = {The data are obtained through satellite maps, and there are certain errors},
     note{1} = {The latitude and longitude of the surface is the latitude and longitude of its centroid. There is a certain error in the measurement of latitude and longitude, for reference},
     note{2} = {This length is the length in our study area},
     note{3} = {Total area}
                ]{colsep = 3pt,
                  colspec = {@{} X[2,l, m, font=\linespread{0.84}\selectfont] r r
                            *{2}{X[c, si={table-format=4.2}]}
                                 X[c, si={table-format=2.2,
                                          minimum-integer-digits=1}]
                            @{}},
                   row{1} = {font=\small\bfseries, c, m}
    }
    \toprule
name        & latitude\TblrNote{1} 
                & longitude
                     & {{{gggggg \unit{\metre}}}}
                        & {{{gggggg\TblrNote{2} \unit{\metre}}}}
                            & {{{area\TblrNote{3} \unit{\km\squared}}}}\
\midrule

Dong Lake    & \ang{30;33;29.52}N 
                & \ang{114;22;47.55}E 
                    &   &   & 12.74         \
Dongting Lake

            & \ang{30;33;12.71}N 
                &\ang{114;20;46.87}E 
                    &   &   & 0.12          \
Great river & \ang{30;33;33.66}N
                & \ang{114;20;09.29}E

                    & 1682.88
                        &   &               \
Big lake    & \ang{30;34;06.02}N

                & \ang{114;19;45.86}E 
                    &   &   & 2.74          \
inside the gate

            & \ang{30;33;54.85}N 
                & \ang{114;18;35.99}E 
                    &   &   & 2.74          \
new ditches & \ang{30;35;33.19}N

                &\ang{114;23;02.77}E 
                    & 977

                        &   &               \
west part of new gate

            & \ang{30;35;26.31}N 
                & \ang{114;21;43.67}E 
                    & 5213.77 
                        &   &               \
Luoai port  & \ang{30;37;08.49}N

                &\ang{114;21;27.93}E 
                    & 3770.58 
                        &   &               \
qingling port

            & \ang{30;39;02.32}N

                &\ang{114;24;30.27}E 
                    &   &   & 0.13          \
from port to lake 
            & \ang{30;37;03.06}N

                & \ang{114;24;22.99}E 
                    & 345.15 
                        &   &               \
east part of the gate

            & \ang{30;38;05.41}N

                & \ang{114;24;27.64}E 
                    & 2926.08 
                        &   &               \
Yangzi river

            & \ang{30;37;43.29}N 
                & \ang{114;20;58.87}E 
                    &   &   &               \
east part of the lake

            & \ang{30;35;55.14}N 
                & \ang{114;23;14.49}E 
                    & 1090.45 
                        &   &               \
Donghu port & \ang{30;35;37.38}N 
                & \ang{114;23;45.81}E 
                    & 7332.3 
                        & 4614.19
                            &               \
west section of qingqing

            & \ang{30;38;01.20}N

                & \ang{114;24;11.10}E
                    & 3449.86
                        &   &               \
new road  drainage station 
            & \ang{30;33;55.17}N 
                &\ang{114;18;48.14}E 
                    &   &   &               \
nanjing drainage station

            & \ang{30;33;52.23}N 
                & \ang{114;18;29.72}E 
                    &   &   &               \
Beijing pumping station

            & \ang{30;37;22.34}N 
                &\ang{114;21;01.01}E

                    &   &   &               \
Guilin road gata

            & \ang{30;37;19.42}N 
                &\ang{114;20;57.23}E 
                    &   &   &               \
the last gate

            & \ang{30;39;16.08}N 
                & \ang{114;24;31.97}E 
                    &   &   &               \
    \bottomrule
\end{talltblr}
    \end{table}
\end{document}

Notes: You really read (again and again) package documentation. Not just read but also experimenting with different settings for column formatting. My experiences show me, that the best metod of learning is learning-by-doing. At start is a bit time consuming, but you will quite soon figured out philosophy of tabularray syntax.

• Meaning of options c (center), l (left), r (right) and m (middle), t (top) b (bottom, last three are defined in the array package) is the same as at classic tables. - Beside mentioned options, tabularray introduce three more options: h (head, at top of cell), f (foot, at bottom of cell) and j (justified).
• This options can be used stand alone or as attributes of X or Q columns types. For example:
  • X[c] has width, which is calculated by LaTeX and column content is horizontal
  • `X[2,l] has twice of width, which is calculated by LaTeX and left aligned column content
  • Q[c, 2cm] or Q[c, wd=2cm] define column with 2cm width and horizonal centered content
  • X[j] has justified text, which is hyphenated when needed
  • column c behave the same as at "classic" tables width of column is equal to the width of longest content in cells and is horizontal centered (similarly is for other options)
• At S columns (define as S column or for example Q[c, si], where formatting can be defined by \sisetup outside of table, see siunitx documentation) the no number content of such cel had to be according siunitx package in classic tables enclosed in pair of curly braces:
  • by this is interrupted table-format settings,
  • disabled wrong interpretation of content meaning (bear in mind, that siunitx use some letters for designate numbers, for example 10e5 mean 10 x 10^5!
• The tabularray due to different table processing (using l3exp) require to add two more curly braces pairs (that siunitx requirement works in all circumstances).
• The tabularray package enables formatting rows to. For examples:
  • with row{1} = {font=\bfseries} prescribe boldface text in all row cells in the first row,
  • with row{Z} = {font=\scfaily, c} prescribe small caps font and centering of contents in the last row in table
• etc.,

Addendum: you may liked table formatting, which groups rows, for example with three of them and insert some additional vertical space between them. For this add to preamble

  \ExplSyntaxOn
\NewChildSelector{eachthree}
  {
    \int_step_inline:nnnn {5}{3}{\l_tblr_childs_total_tl}
      { \clist_put_right:Nn \l_tblr_childs_clist {##1} }
  }
\ExplSyntaxOff

and to table preamble:

                   row{eachthree} = {abovesep=2ex},

Considering this additions, table will los as follow: