Add proximity.dist_pin_to_pin to the dbt DAG using intermediate transforms

aws-athena/ctas/proximity-dist_pin_to_pin.sql

@@ -1,136 +1,2 @@
--- CTAS to find the 3 nearest neighbor PINs for every PIN for every year
-CREATE TABLE IF NOT EXISTS proximity.dist_pin_to_pin_temp
-WITH (
-    FORMAT = 'Parquet',
-    WRITE_COMPRESSION = 'SNAPPY',
-    EXTERNAL_LOCATION
-    = 's3://ccao-athena-results-us-east-1/dist_pin_to_pin_temp',
-    PARTITIONED_BY = ARRAY['year']
-) AS (
-    WITH pin_locations AS (
-        SELECT
-            pin10,
-            year,
-            x_3435,
-            y_3435,
-            ST_POINT(x_3435, y_3435) AS point
-        FROM spatial.parcel
-    ),
-
-    most_recent_pins AS (
-        -- Parcel centroids may shift very slightly over time in GIS shapefiles.
-        -- We want to make sure we only grab the most recent instance of a given
-        -- parcel to avoid duplicates caused by these slight shifts.
-        SELECT
-            x_3435,
-            y_3435,
-            RANK() OVER (PARTITION BY pin10 ORDER BY year DESC) AS r
-        FROM spatial.parcel
-    ),
-
-    distinct_pins AS (
-        SELECT DISTINCT
-            x_3435,
-            y_3435
-        FROM most_recent_pins
-        WHERE r = 1
-    ),
-
-    pin_dists AS (
-        SELECT *
-        FROM (
-            SELECT
-                dists.*,
-                ROW_NUMBER()
-                    OVER (
-                        PARTITION BY dists.x_3435, dists.y_3435, dists.year
-                        ORDER BY dists.dist
-                    )
-                    AS row_num
-            FROM (
-                SELECT
-                    dp.x_3435,
-                    dp.y_3435,
-                    loc.year,
-                    loc.pin10,
-                    ST_DISTANCE(ST_POINT(dp.x_3435, dp.y_3435), loc.point) AS dist
-                FROM distinct_pins AS dp
-                INNER JOIN pin_locations AS loc
-                    ON ST_CONTAINS(
-                        ST_BUFFER(ST_POINT(dp.x_3435, dp.y_3435), 1000), loc.point
-                    )
-            ) AS dists
-        )
-        WHERE row_num <= 4
-    )
-
-    SELECT *
-    FROM (
-        SELECT
-            pcl.pin10,
-            MAX(CASE
-                WHEN pd.row_num = 2 THEN pd.pin10
-            END) AS nearest_neighbor_1_pin10,
-            MAX(CASE
-                WHEN pd.row_num = 2 THEN pd.dist
-            END) AS nearest_neighbor_1_dist_ft,
-            MAX(CASE
-                WHEN pd.row_num = 3 THEN pd.pin10
-            END) AS nearest_neighbor_2_pin10,
-            MAX(CASE
-                WHEN pd.row_num = 3 THEN pd.dist
-            END) AS nearest_neighbor_2_dist_ft,
-            MAX(CASE
-                WHEN pd.row_num = 4 THEN pd.pin10
-            END) AS nearest_neighbor_3_pin10,
-            MAX(CASE
-                WHEN pd.row_num = 4 THEN pd.dist
-            END) AS nearest_neighbor_3_dist_ft,
-            pcl.year
-        FROM spatial.parcel AS pcl
-        INNER JOIN pin_dists AS pd
-            ON pcl.x_3435 = pd.x_3435
-            AND pcl.y_3435 = pd.y_3435
-            AND pcl.year = pd.year
-        GROUP BY pcl.pin10, pcl.year
-    )
-    WHERE nearest_neighbor_1_pin10 IS NOT NULL
-        AND nearest_neighbor_2_pin10 IS NOT NULL
-        AND nearest_neighbor_3_pin10 IS NOT NULL
-)
-
--- Consolidate unbucketed files into single files and delete temp table
-CREATE TABLE IF NOT EXISTS proximity.dist_pin_to_pin
-WITH (
-    format='Parquet',
-    write_compression = 'SNAPPY',
-    external_location='s3://ccao-athena-ctas-us-east-1/proximity/dist_pin_to_pin',
-    partitioned_by = ARRAY['year'],
-    bucketed_by = ARRAY['pin10'],
-    bucket_count = 1
-) AS (
-    SELECT
-        pin10,
-        nearest_neighbor_1_pin10,
-        nearest_neighbor_1_dist_ft,
-        nearest_neighbor_2_pin10,
-        nearest_neighbor_2_dist_ft,
-        nearest_neighbor_3_pin10,
-        nearest_neighbor_3_dist_ft,
-        year
-    FROM proximity.dist_pin_to_pin_temp
-    UNION
-    SELECT
-        pin10,
-        nearest_neighbor_1_pin10,
-        nearest_neighbor_1_dist_ft,
-        nearest_neighbor_2_pin10,
-        nearest_neighbor_2_dist_ft,
-        nearest_neighbor_3_pin10,
-        nearest_neighbor_3_dist_ft,
-        year
-    FROM proximity.dist_pin_to_pin_temp2
-);
-
-DROP TABLE IF EXISTS proximity.dist_pin_to_pin_temp
-DROP TABLE IF EXISTS proximity.dist_pin_to_pin_temp2
+-- View that finds the 3 nearest neighbor PINs for every PIN for every year
+SELECT * FROM {{ ref('proximity.dist_pin_to_pin_10km') }}

aws-athena/ctas/proximity-dist_pin_to_pin_10km.sql

@@ -0,0 +1,22 @@
+-- CTAS that finds the 3 nearest neighbor PINs for every PIN for every year
+-- within a 10km radius, filtered for PINs that do not have three neighbors
+-- within a 1km radius
+{{
+    config(
+        materialized='table',
+        partitioned_by=['year'],
+        bucketed_by=['pin10'],
+        bucket_count=1
+    )
+}}
+
+SELECT *
+FROM (
+    {{
+        nearest_pin_neighbors(
+            ref('proximity.dist_pin_to_pin_1km_missing_matches'),
+            3,
+            10000
+        )
+    }}
+)

aws-athena/ctas/proximity-dist_pin_to_pin_1km.sql

@@ -0,0 +1,21 @@
+-- CTAS that finds the 3 nearest neighbor PINs for every PIN for every year
+-- within a 1km radius
+{{
+    config(
+        materialized='table',
+        partitioned_by=['year'],
+        bucketed_by=['pin10'],
+        bucket_count=1
+    )
+}}
+
+SELECT *
+FROM (
+    {{
+        nearest_pin_neighbors(
+            source('spatial', 'parcel'),
+            3,
+            1000
+        )
+    }}
+)

aws-athena/ctas/proximity-dist_pin_to_pin_1km_missing_matches.sql

@@ -0,0 +1,14 @@
+-- Select all PINs from spatial.parcel that do not have 3 neighbors within 1km
+{{ config(materialized='ephemeral') }}
+
+SELECT
+    pcl.pin10,
+    pcl.year,
+    pcl.x_3435,
+    pcl.y_3435,
+    dist_pin_to_pin_1km.pin10
+FROM {{ source('spatial', 'parcel') }} AS pcl
+LEFT JOIN {{ ref('proximity.dist_pin_to_pin_1km') }} AS dist_pin_to_pin_1km
+    ON pcl.pin10 = dist_pin_to_pin_1km.pin10
+    AND pcl.year = dist_pin_to_pin_1km.year
+WHERE dist_pin_to_pin_1km.pin10 IS NULL

aws-athena/views/proximity-vw_pin10_proximity.sql

@@ -150,6 +150,6 @@ LEFT JOIN
 LEFT JOIN {{ ref('proximity.dist_pin_to_water') }} AS dist_pin_to_water
     ON pin.pin10 = dist_pin_to_water.pin10
     AND pin.year = dist_pin_to_water.year
-LEFT JOIN {{ source('proximity', 'dist_pin_to_pin') }} AS dist_pin_to_pin
+LEFT JOIN {{ ref('proximity.dist_pin_to_pin') }} AS dist_pin_to_pin
     ON pin.pin10 = dist_pin_to_pin.pin10
     AND pin.year = dist_pin_to_pin.year

aws-athena/views/proximity-vw_pin10_proximity_fill.sql

@@ -148,7 +148,7 @@ LEFT JOIN
 LEFT JOIN {{ ref('proximity.dist_pin_to_park') }} AS dist_pin_to_park
     ON pin.pin10 = dist_pin_to_park.pin10
     AND cyf.nearest_park_data_year = dist_pin_to_park.year
-LEFT JOIN {{ source('proximity', 'dist_pin_to_pin') }} AS dist_pin_to_pin
+LEFT JOIN {{ ref('proximity.dist_pin_to_pin') }} AS dist_pin_to_pin
     ON pin.pin10 = dist_pin_to_pin.pin10
     AND cyf.year = dist_pin_to_pin.year -- NOTE, doesn't need to be filled
 LEFT JOIN

dbt/macros/nearest_pin_neighbors.sql

@@ -0,0 +1,82 @@
+{% macro nearest_pin_neighbors(source_model, num_neighbors, radius_km) %}
+    with
+        pin_locations as (
+            select pin10, year, x_3435, y_3435, st_point(x_3435, y_3435) as point
+            from {{ source("spatial", "parcel") }}
+        ),
+
+        most_recent_pins as (
+            -- Parcel centroids may shift very slightly over time in GIS shapefiles.
+            -- We want to make sure we only grab the most recent instance of a given
+            -- parcel to avoid duplicates caused by these slight shifts.
+            select
+                x_3435, y_3435, rank() over (partition by pin10 order by year desc) as r
+            from {{ source_model }}
+        ),
+
+        distinct_pins as (
+            select distinct x_3435, y_3435 from most_recent_pins where r = 1
+        ),
+
+        pin_dists as (
+            select *
+            from
+                (
+                    select
+                        dists.*,
+                        row_number() over (
+                            partition by dists.x_3435, dists.y_3435, dists.year
+                            order by dists.dist
+                        ) as row_num
+                    from
+                        (
+                            select
+                                dp.x_3435,
+                                dp.y_3435,
+                                loc.year,
+                                loc.pin10,
+                                st_distance(
+                                    st_point(dp.x_3435, dp.y_3435), loc.point
+                                ) as dist
+                            from distinct_pins as dp
+                            inner join
+                                pin_locations as loc
+                                on st_contains(
+                                    st_buffer(
+                                        st_point(dp.x_3435, dp.y_3435), {{ radius_km }}
+                                    ),
+                                    loc.point
+                                )
+                        ) as dists
+                )
+            where row_num <= 4
+        )
+
+    select *
+    from
+        (
+            select
+                pcl.pin10,
+                {% for idx in range(1, num_neighbors + 1) %}
+                    max(
+                        case when pd.row_num = {{ idx + 1 }} then pd.pin10 end
+                    ) as nearest_neighbor_{{ idx }}_pin10,
+                    max(
+                        case when pd.row_num = {{ idx + 1 }} then pd.dist end
+                    ) as nearest_neighbor_{{ idx }}_dist_ft,
+                {% endfor %}
+                pcl.year
+            from {{ source("spatial", "parcel") }} as pcl
+            inner join
+                pin_dists as pd
+                on pcl.x_3435 = pd.x_3435
+                and pcl.y_3435 = pd.y_3435
+                and pcl.year = pd.year
+            group by pcl.pin10, pcl.year
+        )
+    where
+        {% for idx in range(1, num_neighbors + 1) %}
+            {% if idx != 1 %} and{% endif %}
+            nearest_neighbor_{{ idx }}_pin10 is not null
+        {% endfor %}
+{% endmacro %}

dbt/models/proximity/docs.md

@@ -0,0 +1,22 @@
+{% docs dist_pin_to_pin %}
+View that finds the three nearest neighbor PINs for every PIN for every year.
+{% enddocs %}
+
+{% docs dist_pin_to_pin_intermediate %}
+Intermediate table used to generate `proximity.dist_pin_to_pin`.
+
+The `proximity.dist_pin_to_pin` view is intended to record distances to the
+three closest PINs for all PINs in the county for all years in the data.
+This type of recursive spatial query is expensive, however, and some PINs are
+quite far (>1km) from the nearest three PINs, so we use intermediate tables
+to strike a balance between data completeness and computational efficiency.
+
+To compute the full set of distances in `proximity.dist_pin_to_pin`, we first
+generate PIN-to-PIN distances using a 1km buffer and store the results in the
+`proximity.dist_pin_to_pin_1km` table. Then, we query for PINs that did not have
+any matches within 1km, using the ephemeral model
+`proximity.dist_pin_to_pin_1km_missing_matches` to encapsulate the logic. Next,
+we redo the query with an expanded 10km buffer, storing the results in the
+`proximity.dist_pin_to_pin_10km` table. Finally, the 10km table is aliased to
+the `proximity.dist_pin_to_pin` view for ease of querying.
+{% enddocs %}

dbt/models/proximity/proximity.dist_pin_to_pin.sql

@@ -0,0 +1 @@
+../../../aws-athena/ctas/proximity-dist_pin_to_pin.sql

dbt/models/proximity/proximity.dist_pin_to_pin_10km.sql

@@ -0,0 +1 @@
+../../../aws-athena/ctas/proximity-dist_pin_to_pin_10km.sql

dbt/models/proximity/proximity.dist_pin_to_pin_1km.sql

@@ -0,0 +1 @@
+../../../aws-athena/ctas/proximity-dist_pin_to_pin_1km.sql

dbt/models/proximity/proximity.dist_pin_to_pin_1km_missing_matches.sql

@@ -0,0 +1 @@
+../../../aws-athena/ctas/proximity-dist_pin_to_pin_1km_missing_matches.sql

dbt/models/proximity/schema.yml

@@ -1,11 +1,6 @@
 version: 2
 
 
-sources:
-  - name: proximity
-    tables:
-      - name: dist_pin_to_pin
-
 models:
   - name: proximity.cnt_pin_num_bus_stop
   - name: proximity.cnt_pin_num_foreclosure
@@ -22,6 +17,14 @@ models:
   - name: proximity.dist_pin_to_metra_route
   - name: proximity.dist_pin_to_metra_stop
   - name: proximity.dist_pin_to_park
+  - name: proximity.dist_pin_to_pin
+    description: '{{ doc("dist_pin_to_pin") }}'
+  - name: proximity.dist_pin_to_pin_1km
+    description: '{{ doc("dist_pin_to_pin_intermediate") }}'
+  - name: proximity.dist_pin_to_pin_1km_missing_matches
+    description: '{{ doc("dist_pin_to_pin_intermediate") }}'
+  - name: proximity.dist_pin_to_pin_10km
+    description: '{{ doc("dist_pin_to_pin_intermediate") }}'
   - name: proximity.dist_pin_to_railroad
   - name: proximity.dist_pin_to_water
   - name: proximity.vw_pin10_proximity