add alternative approach via streets

streets.ps1

@@ -0,0 +1,95 @@
+$partyMapping = @{
+    ARD   = 'Blue'
+    ZDF   = 'Orange'
+    'C&A' = 'Red'
+}
+
+# nested array instead of hashtable, because hashtable keys are case-insensitive
+$replacementList = @(
+    ,('strasse','straße')
+    ,('Strasse','Straße')
+    ,('Albrecht-von-Bernegger-S','Albrecht-von-Bernegger-Straße')
+    ,('Geschwister-Scholl-Str.','Geschwister-Scholl-Straße')
+    ,('Albert-Schweitzer-Str.','Albert-Schweitzer-Straße')
+    ,('Freiherr-V-Stein-Str','Freiherr-vom-Stein-Straße')
+    ,('Nussbaumweg','Nußbaumweg')
+    ,('Elstarweg ','Elstarweg')
+)
+
+$featureList = Import-Csv ./data.csv
+| Sort-Object -Unique Strassenname
+| Group-Object Wahllokal1
+| ForEach-Object {
+    $pollingStation = $_
+
+    $party = ('ARD','ZDF','C&A' | Get-Random)
+
+    $pollingStation.Group | ForEach-Object {
+        $street = $_.Strassenname
+        foreach ($replacement in $replacementList) {
+            $street = $street.Replace($replacement[0], $replacement[1])
+        }
+
+        $query = '
+<osm-script>
+  <query into="_" type="area">
+    <has-kv k="name" modv="" v="Öhringen"/>
+  </query>
+  <query into="_" type="way">
+    <has-kv k="name" modv="" v="{0}"/>
+    <area-query/>
+  </query>
+  <union into="_">
+    <item from="_" into="_"/>
+    <recurse type="way-node"/>
+  </union>
+  <print e="" from="_" geometry="skeleton" ids="yes" limit="" mode="body" n="" order="id" s="" w=""/>
+</osm-script>' -f $street
+
+        $overpassSplat = @{
+            Method = 'Post'
+            Uri = 'https://overpass-api.de/api/interpreter'
+            Body = $query
+        }
+        $overpassResult = Invoke-RestMethod @overpassSplat
+
+        if (!$overpassResult.osm.way.nd) {
+            Write-Error ('way "{0}" for polling station "{1}" probably not found' -f $street,$pollingStation.name)
+            return
+        }
+
+        $overpassResult.osm.way | ForEach-Object {
+            $coordinateList = $_.nd.ref | ForEach-Object {
+                $overpassResult.osm.node
+                | Where-Object id -eq $_
+                | ForEach-Object{
+                    ,($_.lon,$_.lat)
+                }
+            }
+
+            [PSCustomObject]@{
+                type = 'Feature'
+                properties = [PSCustomObject]@{
+                    _umap_options = [PSCustomObject]@{
+                        #color = ($using:partyMapping).$party
+                        color = $partyMapping.$party
+                        weight = 10
+                    }
+                    name = $street
+                    description = $pollingStation.Name
+                }
+                geometry = [PSCustomObject]@{
+                    type = 'LineString'
+                    coordinates = $coordinateList
+                }
+            }
+        }
+    }
+}
+
+$output = [PSCustomObject]@{
+    type = 'FeatureCollection'
+    features = $featureList
+}
+
+$output | ConvertTo-Json -Depth 99 | Out-File output.geojson