_nesh_timeline_aggregators

README.md

@@ -121,6 +121,7 @@ List of related webpages not yet mentioned in the manuscript:
 - https://mapsynergy.com/ and https://mapsynergy.maps.arcgis.com/apps/dashboards/44d9c8422f3c4cc898642d75392337db
 - https://snowbrains.com/inconsistencies-in-classification-of-ski-slope-difficulty-ratings/
 - https://steepseeker.com/
+- https://bestsnow.net/
 - https://www.zrankings.com/
 
 ## Publicity & Users

openskistats/nesh/timelines.py

@@ -24,6 +24,9 @@
 
 from openskistats.utils import get_request_headers
 
+SEASON_ORIGIN_MONTH = 9
+SEASON_ORIGIN_DAY = 1
+
 
 @dataclass(frozen=True)
 class NewEnglandSkiHistoryTimelineScraper:
@@ -171,6 +174,40 @@ def read_nesh_timelines_skimap_key() -> pl.DataFrame:
     )
 
 
+def _nesh_timeline_aggregators() -> list[pl.Expr]:
+    season_origin_date_col = pl.date(
+        year=pl.col.season,
+        month=SEASON_ORIGIN_MONTH,
+        day=SEASON_ORIGIN_DAY,
+    )
+    return [
+        pl.col("opening_date")
+        .sub(season_origin_date_col)
+        .dt.total_days()
+        .mean()
+        .alias("opening_date_offset_mean"),
+        pl.col("closing_date")
+        .sub(season_origin_date_col)
+        .dt.total_days()
+        .mean()
+        .alias("closing_date_offset_mean"),
+        pl.col("opening_date")
+        .to_physical()
+        .mean()
+        .cast(pl.Date)
+        .alias("opening_date_mean"),
+        pl.col("closing_date")
+        .to_physical()
+        .mean()
+        .cast(pl.Date)
+        .alias("closing_date_mean"),
+        pl.col.season_duration.mean().alias("season_duration_mean"),
+        pl.col.opening_date.count().alias("opening_date_count"),
+        pl.col.closing_date.count().alias("closing_date_count"),
+        pl.col.season_duration.count().alias("season_duration_count"),
+    ]
+
+
 nesh_to_skimap = {
     "https://www.newenglandskihistory.com/NewHampshire/abenaki.php": "https://skimap.org/skiareas/view/4091",
     "https://www.newenglandskihistory.com/NewHampshire/arrowhead.php": "https://skimap.org/skiareas/view/2146",