diff --git a/coding/L7.qmd b/coding/L7.qmd
index ce0fe99..2163bc3 100644
--- a/coding/L7.qmd
+++ b/coding/L7.qmd
@@ -137,31 +137,147 @@ for (isite in 1:10) {
 ## purrr::map
 
 ```{r}
+require(tidyverse)
+datadf <- readRDS("../data/chinawq/datadf.rds")
+datadf |>
+  select(1:7) |>
+  tidyr::nest(wqdf = -c(lon, lat)) |>
+  slice(1:10) |>
+  mutate(
+    m = purrr::map(
+      wqdf,
+      \(x) {
+        lm(formula = DO ~ pH, data = x)
+      }
+    )
+  ) |>
+  mutate(slope = purrr::map_dbl(m, \(x) coef(x)[2])) |>
+  mutate(
+    p = purrr::map2(wqdf, slope, \(x, y) {
+      x |>
+        ggplot(aes(x = pH, y = DO)) +
+        geom_smooth(method = "lm") +
+        geom_point() +
+        ggtitle(paste0("Slope: ", round(y, 2)))
+    })
+  ) |>
+  pull(p) |>
+  patchwork::wrap_plots() +
+  patchwork::plot_layout(ncol = 2)
+```
 
- datadf |>
-   select(1:7) |>
-   tidyr::nest(wqdf = -c(lon, lat)) |>
-   slice(1:10) |>
-   mutate(
-     m = purrr::map(
-       wqdf,
-       \(x) {
-         lm(formula = DO ~ pH, data = x)
-       }
-     )
-   ) |>
-   mutate(slope = purrr::map_dbl(m, \(x) coef(x)[2])) |>
-   mutate(
-     p = purrr::map(wqdf, \(x) {
-       x |>
-         ggplot(aes(x = pH, y = DO)) +
-         geom_smooth(method = "lm") +
-         geom_point()
-     })
-   ) |>
-   pull(p) |>
-   patchwork::wrap_plots() +
-   patchwork::plot_layout(ncol = 2)
+
+```{r}
+longriverdf <- tibble(
+  fn = dir(
+    "../data/LongRiver/data/",
+    pattern = "csv",
+    full.names = TRUE,
+    recursive = TRUE
+  )
+) |>
+  mutate(data = purrr::map(fn, readr::read_csv))
+
+lang <- "cn"
+longriverdf |>
+  mutate(year = gsub("^.*([0-9)]{4})-.*$", "\\1", fn)) |>
+  mutate(month = gsub("^.*[0-9)]{4}-([0-9]{2}).*$", "\\1", fn)) |>
+  mutate(site = gsub("^.*_(.*).csv$", "\\1", fn)) |>
+  select(-fn) |>
+  slice(1:10) |>
+  tidyr::unnest(data) |>
+  ggplot(aes(x = site, y = z)) +
+  geom_boxplot(colour = "black", size = 0.8) +
+  facet_wrap(~month) +
+  dwfun::theme_sci()
+```
+
+```{r}
+longriverdf |>
+  mutate(year = gsub("^.*([0-9)]{4})-.*$", "\\1", fn)) |>
+  mutate(month = gsub("^.*[0-9)]{4}-([0-9]{2}).*$", "\\1", fn)) |>
+  mutate(site = gsub("^.*_(.*).csv$", "\\1", fn)) |>
+  select(-fn) |>
+  slice(1:12) |>
+  mutate(
+    p = purrr::map(data, \(x) {
+      x |>
+        ggplot(aes(tm, z)) +
+        geom_point()
+    })
+  ) |>
+  pull(p) |>
+  patchwork::wrap_plots() |>
+  patchwork::plot_layout(ncol = 3)
+```
+
+```{r}
+# datadf
+# 不同年份，DO 的平均值，
+# x lon
+# y lat
+# colour/ fill Do mean
+# facet: year
+datadf |>
+  dplyr::mutate(year = year(date)) |>
+  summarize(DO_mean = mean(DO, na.rm = TRUE), .by = c(lon, lat, year)) |>
+  dplyr::filter(year > 2006) |>
+  ggplot(aes(x = lon, y = lat)) +
+  geom_point(aes(fill = DO_mean), shape = 21) +
+  scale_fill_viridis_c() +
+  facet_wrap(~year) +
+  labs(x = "Longitude", y = "Latitude", fill = "DO (mg/L)") +
+  theme_bw()
+```
+
+
+```{r}
+# x  月份
+# y NH4: pH
+
+p1 <- datadf |>
+  mutate(month = month(date)) |>
+  dplyr::filter(NH4N < 100) |>
+  ggplot(aes(x = month, y = NH4N)) +
+  geom_boxplot(aes(fill = as.factor(month)), colour = "black", size = 0.8) +
+  scale_y_log10(
+    breaks = scales::trans_breaks("log10", function(x) 10^x),
+    labels = scales::trans_format(
+      "log10",
+      scales::math_format(10^.x, format = "%.1f")
+    )
+  ) +
+  scale_x_continuous(breaks = 1:12, labels = month.abb) +
+  theme(legend.position = "none")
+p2 <- datadf |>
+  mutate(month = month(date)) |>
+  ggplot(aes(x = month, y = CODMn)) +
+  geom_boxplot(aes(fill = as.factor(month)), colour = "black", size = 0.8) +
+  scale_y_log10(
+    breaks = scales::trans_breaks("log10", function(x) 10^x),
+    labels = scales::trans_format(
+      "log10",
+      scales::math_format(10^.x, format = "%.1f")
+    )
+  ) +
+  scale_x_continuous(breaks = 1:12, labels = month.abb) +
+  theme(legend.position = "none")
+p3 <- datadf |>
+  mutate(month = month(date)) |>
+  dplyr::filter(DO < 20) |>
+  ggplot(aes(x = month, y = DO)) +
+  geom_boxplot(aes(fill = as.factor(month)), colour = "black", size = 0.8) +
+  scale_x_continuous(breaks = 1:12, labels = month.abb) +
+  theme(legend.position = "none")
+p4 <- datadf |>
+  mutate(month = month(date)) |>
+  dplyr::filter(pH > 5) |>
+  ggplot(aes(x = month, y = pH)) +
+  geom_boxplot(aes(fill = as.factor(month)), colour = "black", size = 0.8) +
+  scale_x_continuous(breaks = 1:12, labels = month.abb) +
+  theme(legend.position = "none")
+
+(p1 | p2) / (p3 | p4) + patchwork::plot_annotation(tag_levels = "A")
 ```
 
 
diff --git a/data/LongRiver b/data/LongRiver
new file mode 160000
index 0000000..d316bf4
--- /dev/null
+++ b/data/LongRiver
@@ -0,0 +1 @@
+Subproject commit d316bf46568a202cdc320e086403d22d7e303f2d